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[Linux-stable-mirror] Patch "net: call cgroup_sk_alloc() earlier in sk_clone_lock()" has been added to the 4.9-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled net: call cgroup_sk_alloc() earlier in sk_clone_lock() to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: net-call-cgroup_sk_alloc-earlier-in-sk_clone_lock.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:24:03 CET 2017 From: Eric Dumazet <edumazet(a)google.com> Date: Tue, 10 Oct 2017 19:12:33 -0700 Subject: net: call cgroup_sk_alloc() earlier in sk_clone_lock() From: Eric Dumazet <edumazet(a)google.com> [ Upstream commit c0576e3975084d4699b7bfef578613fb8e1144f6 ] If for some reason, the newly allocated child need to be freed, we will call cgroup_put() (via sk_free_unlock_clone()) while the corresponding cgroup_get() was not yet done, and we will free memory too soon. Fixes: d979a39d7242 ("cgroup: duplicate cgroup reference when cloning sockets") Signed-off-by: Eric Dumazet <edumazet(a)google.com> Cc: Johannes Weiner <hannes(a)cmpxchg.org> Cc: Tejun Heo <tj(a)kernel.org> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/core/sock.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1526,6 +1526,7 @@ struct sock *sk_clone_lock(const struct newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; sock_reset_flag(newsk, SOCK_DONE); + cgroup_sk_alloc(&newsk->sk_cgrp_data); skb_queue_head_init(&newsk->sk_error_queue); filter = rcu_dereference_protected(newsk->sk_filter, 1); @@ -1560,8 +1561,6 @@ struct sock *sk_clone_lock(const struct atomic64_set(&newsk->sk_cookie, 0); mem_cgroup_sk_alloc(newsk); - cgroup_sk_alloc(&newsk->sk_cgrp_data); - /* * Before updating sk_refcnt, we must commit prior changes to memory * (Documentation/RCU/rculist_nulls.txt for details) Patches currently in stable-queue which might be from edumazet(a)google.com are queue-4.9/net-call-cgroup_sk_alloc-earlier-in-sk_clone_lock.patch queue-4.9/tcp-dccp-fix-ireq-opt-races.patch queue-4.9/tcp-fix-tcp_mtu_probe-vs-highest_sack.patch queue-4.9/ipv6-addrconf-increment-ifp-refcount-before-ipv6_del_addr.patch queue-4.9/ipv6-flowlabel-do-not-leave-opt-tot_len-with-garbage.patch queue-4.9/packet-avoid-panic-in-packet_getsockopt.patch queue-4.9/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.9/net_sched-avoid-matching-qdisc-with-zero-handle.patch queue-4.9/tun-tap-sanitize-tunsetsndbuf-input.patch queue-4.9/tcp-dccp-fix-lockdep-splat-in-inet_csk_route_req.patch queue-4.9/tcp-dccp-fix-other-lockdep-splats-accessing-ireq_opt.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "l2tp: check ps->sock before running pppol2tp_session_ioctl()" has been added to the 4.9-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled l2tp: check ps->sock before running pppol2tp_session_ioctl() to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: l2tp-check-ps-sock-before-running-pppol2tp_session_ioctl.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:24:03 CET 2017 From: Guillaume Nault <g.nault(a)alphalink.fr> Date: Fri, 13 Oct 2017 19:22:35 +0200 Subject: l2tp: check ps->sock before running pppol2tp_session_ioctl() From: Guillaume Nault <g.nault(a)alphalink.fr> [ Upstream commit 5903f594935a3841137c86b9d5b75143a5b7121c ] When pppol2tp_session_ioctl() is called by pppol2tp_tunnel_ioctl(), the session may be unconnected. That is, it was created by pppol2tp_session_create() and hasn't been connected with pppol2tp_connect(). In this case, ps->sock is NULL, so we need to check for this case in order to avoid dereferencing a NULL pointer. Fixes: 309795f4bec2 ("l2tp: Add netlink control API for L2TP") Signed-off-by: Guillaume Nault <g.nault(a)alphalink.fr> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/l2tp/l2tp_ppp.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/l2tp/l2tp_ppp.c +++ b/net/l2tp/l2tp_ppp.c @@ -993,6 +993,9 @@ static int pppol2tp_session_ioctl(struct session->name, cmd, arg); sk = ps->sock; + if (!sk) + return -EBADR; + sock_hold(sk); switch (cmd) { Patches currently in stable-queue which might be from g.nault(a)alphalink.fr are queue-4.9/ppp-fix-race-in-ppp-device-destruction.patch queue-4.9/l2tp-check-ps-sock-before-running-pppol2tp_session_ioctl.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "ipv6: flowlabel: do not leave opt->tot_len with garbage" has been added to the 4.9-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled ipv6: flowlabel: do not leave opt->tot_len with garbage to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: ipv6-flowlabel-do-not-leave-opt-tot_len-with-garbage.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:24:03 CET 2017 From: Eric Dumazet <edumazet(a)google.com> Date: Sat, 21 Oct 2017 12:26:23 -0700 Subject: ipv6: flowlabel: do not leave opt->tot_len with garbage From: Eric Dumazet <edumazet(a)google.com> [ Upstream commit 864e2a1f8aac05effac6063ce316b480facb46ff ] When syzkaller team brought us a C repro for the crash [1] that had been reported many times in the past, I finally could find the root cause. If FlowLabel info is merged by fl6_merge_options(), we leave part of the opt_space storage provided by udp/raw/l2tp with random value in opt_space.tot_len, unless a control message was provided at sendmsg() time. Then ip6_setup_cork() would use this random value to perform a kzalloc() call. Undefined behavior and crashes. Fix is to properly set tot_len in fl6_merge_options() At the same time, we can also avoid consuming memory and cpu cycles to clear it, if every option is copied via a kmemdup(). This is the change in ip6_setup_cork(). [1] kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 6613 Comm: syz-executor0 Not tainted 4.14.0-rc4+ #127 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801cb64a100 task.stack: ffff8801cc350000 RIP: 0010:ip6_setup_cork+0x274/0x15c0 net/ipv6/ip6_output.c:1168 RSP: 0018:ffff8801cc357550 EFLAGS: 00010203 RAX: dffffc0000000000 RBX: ffff8801cc357748 RCX: 0000000000000010 RDX: 0000000000000002 RSI: ffffffff842bd1d9 RDI: 0000000000000014 RBP: ffff8801cc357620 R08: ffff8801cb17f380 R09: ffff8801cc357b10 R10: ffff8801cb64a100 R11: 0000000000000000 R12: ffff8801cc357ab0 R13: ffff8801cc357b10 R14: 0000000000000000 R15: ffff8801c3bbf0c0 FS: 00007f9c5c459700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020324000 CR3: 00000001d1cf2000 CR4: 00000000001406f0 DR0: 0000000020001010 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: ip6_make_skb+0x282/0x530 net/ipv6/ip6_output.c:1729 udpv6_sendmsg+0x2769/0x3380 net/ipv6/udp.c:1340 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:633 [inline] sock_sendmsg+0xca/0x110 net/socket.c:643 SYSC_sendto+0x358/0x5a0 net/socket.c:1750 SyS_sendto+0x40/0x50 net/socket.c:1718 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x4520a9 RSP: 002b:00007f9c5c458c08 EFLAGS: 00000216 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 00000000004520a9 RDX: 0000000000000001 RSI: 0000000020fd1000 RDI: 0000000000000016 RBP: 0000000000000086 R08: 0000000020e0afe4 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004bb1ee R13: 00000000ffffffff R14: 0000000000000016 R15: 0000000000000029 Code: e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ea 0f 00 00 48 8d 79 04 48 b8 00 00 00 00 00 fc ff df 45 8b 74 24 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 RIP: ip6_setup_cork+0x274/0x15c0 net/ipv6/ip6_output.c:1168 RSP: ffff8801cc357550 Signed-off-by: Eric Dumazet <edumazet(a)google.com> Reported-by: Dmitry Vyukov <dvyukov(a)google.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/ipv6/ip6_flowlabel.c | 1 + net/ipv6/ip6_output.c | 4 ++-- 2 files changed, 3 insertions(+), 2 deletions(-) --- a/net/ipv6/ip6_flowlabel.c +++ b/net/ipv6/ip6_flowlabel.c @@ -315,6 +315,7 @@ struct ipv6_txoptions *fl6_merge_options } opt_space->dst1opt = fopt->dst1opt; opt_space->opt_flen = fopt->opt_flen; + opt_space->tot_len = fopt->tot_len; return opt_space; } EXPORT_SYMBOL_GPL(fl6_merge_options); --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -1215,11 +1215,11 @@ static int ip6_setup_cork(struct sock *s if (WARN_ON(v6_cork->opt)) return -EINVAL; - v6_cork->opt = kzalloc(opt->tot_len, sk->sk_allocation); + v6_cork->opt = kzalloc(sizeof(*opt), sk->sk_allocation); if (unlikely(!v6_cork->opt)) return -ENOBUFS; - v6_cork->opt->tot_len = opt->tot_len; + v6_cork->opt->tot_len = sizeof(*opt); v6_cork->opt->opt_flen = opt->opt_flen; v6_cork->opt->opt_nflen = opt->opt_nflen; Patches currently in stable-queue which might be from edumazet(a)google.com are queue-4.9/net-call-cgroup_sk_alloc-earlier-in-sk_clone_lock.patch queue-4.9/tcp-dccp-fix-ireq-opt-races.patch queue-4.9/tcp-fix-tcp_mtu_probe-vs-highest_sack.patch queue-4.9/ipv6-addrconf-increment-ifp-refcount-before-ipv6_del_addr.patch queue-4.9/ipv6-flowlabel-do-not-leave-opt-tot_len-with-garbage.patch queue-4.9/packet-avoid-panic-in-packet_getsockopt.patch queue-4.9/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.9/net_sched-avoid-matching-qdisc-with-zero-handle.patch queue-4.9/tun-tap-sanitize-tunsetsndbuf-input.patch queue-4.9/tcp-dccp-fix-lockdep-splat-in-inet_csk_route_req.patch queue-4.9/tcp-dccp-fix-other-lockdep-splats-accessing-ireq_opt.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "ipv6: addrconf: increment ifp refcount before ipv6_del_addr()" has been added to the 4.9-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled ipv6: addrconf: increment ifp refcount before ipv6_del_addr() to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: ipv6-addrconf-increment-ifp-refcount-before-ipv6_del_addr.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:24:03 CET 2017 From: Eric Dumazet <edumazet(a)google.com> Date: Mon, 30 Oct 2017 22:47:09 -0700 Subject: ipv6: addrconf: increment ifp refcount before ipv6_del_addr() From: Eric Dumazet <edumazet(a)google.com> [ Upstream commit e669b86945478b3d90d2d87e3793a6eed06d332f ] In the (unlikely) event fixup_permanent_addr() returns a failure, addrconf_permanent_addr() calls ipv6_del_addr() without the mandatory call to in6_ifa_hold(), leading to a refcount error, spotted by syzkaller : WARNING: CPU: 1 PID: 3142 at lib/refcount.c:227 refcount_dec+0x4c/0x50 lib/refcount.c:227 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 3142 Comm: ip Not tainted 4.14.0-rc4-next-20171009+ #33 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 panic+0x1e4/0x41c kernel/panic.c:181 __warn+0x1c4/0x1e0 kernel/panic.c:544 report_bug+0x211/0x2d0 lib/bug.c:183 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:178 do_trap_no_signal arch/x86/kernel/traps.c:212 [inline] do_trap+0x260/0x390 arch/x86/kernel/traps.c:261 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:298 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905 RIP: 0010:refcount_dec+0x4c/0x50 lib/refcount.c:227 RSP: 0018:ffff8801ca49e680 EFLAGS: 00010286 RAX: 000000000000002c RBX: ffff8801d07cfcdc RCX: 0000000000000000 RDX: 000000000000002c RSI: 1ffff10039493c90 RDI: ffffed0039493cc4 RBP: ffff8801ca49e688 R08: ffff8801ca49dd70 R09: 0000000000000000 R10: ffff8801ca49df58 R11: 0000000000000000 R12: 1ffff10039493cd9 R13: ffff8801ca49e6e8 R14: ffff8801ca49e7e8 R15: ffff8801d07cfcdc __in6_ifa_put include/net/addrconf.h:369 [inline] ipv6_del_addr+0x42b/0xb60 net/ipv6/addrconf.c:1208 addrconf_permanent_addr net/ipv6/addrconf.c:3327 [inline] addrconf_notify+0x1c66/0x2190 net/ipv6/addrconf.c:3393 notifier_call_chain+0x136/0x2c0 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x32/0x60 net/core/dev.c:1697 call_netdevice_notifiers net/core/dev.c:1715 [inline] __dev_notify_flags+0x15d/0x430 net/core/dev.c:6843 dev_change_flags+0xf5/0x140 net/core/dev.c:6879 do_setlink+0xa1b/0x38e0 net/core/rtnetlink.c:2113 rtnl_newlink+0xf0d/0x1a40 net/core/rtnetlink.c:2661 rtnetlink_rcv_msg+0x733/0x1090 net/core/rtnetlink.c:4301 netlink_rcv_skb+0x216/0x440 net/netlink/af_netlink.c:2408 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4313 netlink_unicast_kernel net/netlink/af_netlink.c:1273 [inline] netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1299 netlink_sendmsg+0xa4a/0xe70 net/netlink/af_netlink.c:1862 sock_sendmsg_nosec net/socket.c:633 [inline] sock_sendmsg+0xca/0x110 net/socket.c:643 ___sys_sendmsg+0x75b/0x8a0 net/socket.c:2049 __sys_sendmsg+0xe5/0x210 net/socket.c:2083 SYSC_sendmsg net/socket.c:2094 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2090 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x7fa9174d3320 RSP: 002b:00007ffe302ae9e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ffe302b2ae0 RCX: 00007fa9174d3320 RDX: 0000000000000000 RSI: 00007ffe302aea20 RDI: 0000000000000016 RBP: 0000000000000082 R08: 0000000000000000 R09: 000000000000000f R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe302b32a0 R13: 0000000000000000 R14: 00007ffe302b2ab8 R15: 00007ffe302b32b8 Fixes: f1705ec197e7 ("net: ipv6: Make address flushing on ifdown optional") Signed-off-by: Eric Dumazet <edumazet(a)google.com> Cc: David Ahern <dsahern(a)gmail.com> Acked-by: David Ahern <dsahern(a)gmail.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/ipv6/addrconf.c | 1 + 1 file changed, 1 insertion(+) --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -3299,6 +3299,7 @@ static void addrconf_permanent_addr(stru if ((ifp->flags & IFA_F_PERMANENT) && fixup_permanent_addr(idev, ifp) < 0) { write_unlock_bh(&idev->lock); + in6_ifa_hold(ifp); ipv6_del_addr(ifp); write_lock_bh(&idev->lock); Patches currently in stable-queue which might be from edumazet(a)google.com are queue-4.9/net-call-cgroup_sk_alloc-earlier-in-sk_clone_lock.patch queue-4.9/tcp-dccp-fix-ireq-opt-races.patch queue-4.9/tcp-fix-tcp_mtu_probe-vs-highest_sack.patch queue-4.9/ipv6-addrconf-increment-ifp-refcount-before-ipv6_del_addr.patch queue-4.9/ipv6-flowlabel-do-not-leave-opt-tot_len-with-garbage.patch queue-4.9/packet-avoid-panic-in-packet_getsockopt.patch queue-4.9/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.9/net_sched-avoid-matching-qdisc-with-zero-handle.patch queue-4.9/tun-tap-sanitize-tunsetsndbuf-input.patch queue-4.9/tcp-dccp-fix-lockdep-splat-in-inet_csk_route_req.patch queue-4.9/tcp-dccp-fix-other-lockdep-splats-accessing-ireq_opt.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "ipip: only increase err_count for some certain type icmp in ipip_err" has been added to the 4.9-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled ipip: only increase err_count for some certain type icmp in ipip_err to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: ipip-only-increase-err_count-for-some-certain-type-icmp-in-ipip_err.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:24:03 CET 2017 From: Xin Long <lucien.xin(a)gmail.com> Date: Thu, 26 Oct 2017 19:19:56 +0800 Subject: ipip: only increase err_count for some certain type icmp in ipip_err From: Xin Long <lucien.xin(a)gmail.com> [ Upstream commit f3594f0a7ea36661d7fd942facd7f31a64245f1a ] t->err_count is used to count the link failure on tunnel and an err will be reported to user socket in tx path if t->err_count is not 0. udp socket could even return EHOSTUNREACH to users. Since commit fd58156e456d ("IPIP: Use ip-tunneling code.") removed the 'switch check' for icmp type in ipip_err(), err_count would be increased by the icmp packet with ICMP_EXC_FRAGTIME code. an link failure would be reported out due to this. In Jianlin's case, when receiving ICMP_EXC_FRAGTIME a icmp packet, udp netperf failed with the err: send_data: data send error: No route to host (errno 113) We expect this error reported from tunnel to socket when receiving some certain type icmp, but not ICMP_EXC_FRAGTIME, ICMP_SR_FAILED or ICMP_PARAMETERPROB ones. This patch is to bring 'switch check' for icmp type back to ipip_err so that it only reports link failure for the right type icmp, just as in ipgre_err() and ipip6_err(). Fixes: fd58156e456d ("IPIP: Use ip-tunneling code.") Reported-by: Jianlin Shi <jishi(a)redhat.com> Signed-off-by: Xin Long <lucien.xin(a)gmail.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/ipv4/ipip.c | 59 +++++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 42 insertions(+), 17 deletions(-) --- a/net/ipv4/ipip.c +++ b/net/ipv4/ipip.c @@ -128,43 +128,68 @@ static struct rtnl_link_ops ipip_link_op static int ipip_err(struct sk_buff *skb, u32 info) { - -/* All the routers (except for Linux) return only - 8 bytes of packet payload. It means, that precise relaying of - ICMP in the real Internet is absolutely infeasible. - */ + /* All the routers (except for Linux) return only + * 8 bytes of packet payload. It means, that precise relaying of + * ICMP in the real Internet is absolutely infeasible. + */ struct net *net = dev_net(skb->dev); struct ip_tunnel_net *itn = net_generic(net, ipip_net_id); const struct iphdr *iph = (const struct iphdr *)skb->data; - struct ip_tunnel *t; - int err; const int type = icmp_hdr(skb)->type; const int code = icmp_hdr(skb)->code; + struct ip_tunnel *t; + int err = 0; + + switch (type) { + case ICMP_DEST_UNREACH: + switch (code) { + case ICMP_SR_FAILED: + /* Impossible event. */ + goto out; + default: + /* All others are translated to HOST_UNREACH. + * rfc2003 contains "deep thoughts" about NET_UNREACH, + * I believe they are just ether pollution. --ANK + */ + break; + } + break; + + case ICMP_TIME_EXCEEDED: + if (code != ICMP_EXC_TTL) + goto out; + break; + + case ICMP_REDIRECT: + break; + + default: + goto out; + } - err = -ENOENT; t = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY, iph->daddr, iph->saddr, 0); - if (!t) + if (!t) { + err = -ENOENT; goto out; + } if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) { - ipv4_update_pmtu(skb, dev_net(skb->dev), info, - t->parms.link, 0, iph->protocol, 0); - err = 0; + ipv4_update_pmtu(skb, net, info, t->parms.link, 0, + iph->protocol, 0); goto out; } if (type == ICMP_REDIRECT) { - ipv4_redirect(skb, dev_net(skb->dev), t->parms.link, 0, - iph->protocol, 0); - err = 0; + ipv4_redirect(skb, net, t->parms.link, 0, iph->protocol, 0); goto out; } - if (t->parms.iph.daddr == 0) + if (t->parms.iph.daddr == 0) { + err = -ENOENT; goto out; + } - err = 0; if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED) goto out; Patches currently in stable-queue which might be from lucien.xin(a)gmail.com are queue-4.9/sctp-reset-owner-sk-for-data-chunks-on-out-queues-when-migrating-a-sock.patch queue-4.9/ipip-only-increase-err_count-for-some-certain-type-icmp-in-ipip_err.patch queue-4.9/sctp-full-support-for-ipv6-ip_nonlocal_bind-ip_freebind.patch queue-4.9/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.9/ip6_gre-only-increase-err_count-for-some-certain-type-icmpv6-in-ip6gre_err.patch queue-4.9/ip6_gre-update-dst-pmtu-if-dev-mtu-has-been-updated-by-toobig-in-__gre6_xmit.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "ip6_gre: update dst pmtu if dev mtu has been updated by toobig in __gre6_xmit" has been added to the 4.9-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled ip6_gre: update dst pmtu if dev mtu has been updated by toobig in __gre6_xmit to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: ip6_gre-update-dst-pmtu-if-dev-mtu-has-been-updated-by-toobig-in-__gre6_xmit.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:24:03 CET 2017 From: Xin Long <lucien.xin(a)gmail.com> Date: Thu, 26 Oct 2017 19:27:17 +0800 Subject: ip6_gre: update dst pmtu if dev mtu has been updated by toobig in __gre6_xmit From: Xin Long <lucien.xin(a)gmail.com> [ Upstream commit 8aec4959d832bae0889a8e2f348973b5e4abffef ] When receiving a Toobig icmpv6 packet, ip6gre_err would just set tunnel dev's mtu, that's not enough. For skb_dst(skb)'s pmtu may still be using the old value, it has no chance to be updated with tunnel dev's mtu. Jianlin found this issue by reducing route's mtu while running netperf, the performance went to 0. ip6ip6 and ip4ip6 tunnel can work well with this, as they lookup the upper dst and update_pmtu it's pmtu or icmpv6_send a Toobig to upper socket after setting tunnel dev's mtu. We couldn't do that for ip6_gre, as gre's inner packet could be any protocol, it's difficult to handle them (like lookup upper dst) in a good way. So this patch is to fix it by updating skb_dst(skb)'s pmtu when dev->mtu < skb_dst(skb)'s pmtu in tx path. It's safe to do this update there, as usually dev->mtu <= skb_dst(skb)'s pmtu and no performance regression can be caused by this. Fixes: c12b395a4664 ("gre: Support GRE over IPv6") Reported-by: Jianlin Shi <jishi(a)redhat.com> Signed-off-by: Xin Long <lucien.xin(a)gmail.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/ipv6/ip6_gre.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) --- a/net/ipv6/ip6_gre.c +++ b/net/ipv6/ip6_gre.c @@ -508,8 +508,8 @@ static netdev_tx_t __gre6_xmit(struct sk __u32 *pmtu, __be16 proto) { struct ip6_tnl *tunnel = netdev_priv(dev); - __be16 protocol = (dev->type == ARPHRD_ETHER) ? - htons(ETH_P_TEB) : proto; + struct dst_entry *dst = skb_dst(skb); + __be16 protocol; if (dev->type == ARPHRD_ETHER) IPCB(skb)->flags = 0; @@ -523,9 +523,14 @@ static netdev_tx_t __gre6_xmit(struct sk tunnel->o_seqno++; /* Push GRE header. */ + protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto; gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags, protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno)); + /* TooBig packet may have updated dst->dev's mtu */ + if (dst && dst_mtu(dst) > dst->dev->mtu) + dst->ops->update_pmtu(dst, NULL, skb, dst->dev->mtu); + return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu, NEXTHDR_GRE); } Patches currently in stable-queue which might be from lucien.xin(a)gmail.com are queue-4.9/sctp-reset-owner-sk-for-data-chunks-on-out-queues-when-migrating-a-sock.patch queue-4.9/ipip-only-increase-err_count-for-some-certain-type-icmp-in-ipip_err.patch queue-4.9/sctp-full-support-for-ipv6-ip_nonlocal_bind-ip_freebind.patch queue-4.9/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.9/ip6_gre-only-increase-err_count-for-some-certain-type-icmpv6-in-ip6gre_err.patch queue-4.9/ip6_gre-update-dst-pmtu-if-dev-mtu-has-been-updated-by-toobig-in-__gre6_xmit.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "ip6_gre: only increase err_count for some certain type icmpv6 in ip6gre_err" has been added to the 4.9-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled ip6_gre: only increase err_count for some certain type icmpv6 in ip6gre_err to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: ip6_gre-only-increase-err_count-for-some-certain-type-icmpv6-in-ip6gre_err.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:24:03 CET 2017 From: Xin Long <lucien.xin(a)gmail.com> Date: Thu, 26 Oct 2017 19:23:27 +0800 Subject: ip6_gre: only increase err_count for some certain type icmpv6 in ip6gre_err From: Xin Long <lucien.xin(a)gmail.com> [ Upstream commit f8d20b46ce55cf40afb30dcef6d9288f7ef46d9b ] The similar fix in patch 'ipip: only increase err_count for some certain type icmp in ipip_err' is needed for ip6gre_err. In Jianlin's case, udp netperf broke even when receiving a TooBig icmpv6 packet. Fixes: c12b395a4664 ("gre: Support GRE over IPv6") Reported-by: Jianlin Shi <jishi(a)redhat.com> Signed-off-by: Xin Long <lucien.xin(a)gmail.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/ipv6/ip6_gre.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) --- a/net/ipv6/ip6_gre.c +++ b/net/ipv6/ip6_gre.c @@ -408,13 +408,16 @@ static void ip6gre_err(struct sk_buff *s case ICMPV6_DEST_UNREACH: net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n", t->parms.name); - break; + if (code != ICMPV6_PORT_UNREACH) + break; + return; case ICMPV6_TIME_EXCEED: if (code == ICMPV6_EXC_HOPLIMIT) { net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n", t->parms.name); + break; } - break; + return; case ICMPV6_PARAMPROB: teli = 0; if (code == ICMPV6_HDR_FIELD) @@ -430,7 +433,7 @@ static void ip6gre_err(struct sk_buff *s net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n", t->parms.name); } - break; + return; case ICMPV6_PKT_TOOBIG: mtu = be32_to_cpu(info) - offset - t->tun_hlen; if (t->dev->type == ARPHRD_ETHER) @@ -438,7 +441,7 @@ static void ip6gre_err(struct sk_buff *s if (mtu < IPV6_MIN_MTU) mtu = IPV6_MIN_MTU; t->dev->mtu = mtu; - break; + return; } if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO)) Patches currently in stable-queue which might be from lucien.xin(a)gmail.com are queue-4.9/sctp-reset-owner-sk-for-data-chunks-on-out-queues-when-migrating-a-sock.patch queue-4.9/ipip-only-increase-err_count-for-some-certain-type-icmp-in-ipip_err.patch queue-4.9/sctp-full-support-for-ipv6-ip_nonlocal_bind-ip_freebind.patch queue-4.9/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.9/ip6_gre-only-increase-err_count-for-some-certain-type-icmpv6-in-ip6gre_err.patch queue-4.9/ip6_gre-update-dst-pmtu-if-dev-mtu-has-been-updated-by-toobig-in-__gre6_xmit.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "gso: fix payload length when gso_size is zero" has been added to the 4.9-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled gso: fix payload length when gso_size is zero to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: gso-fix-payload-length-when-gso_size-is-zero.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:24:03 CET 2017 From: Alexey Kodanev <alexey.kodanev(a)oracle.com> Date: Fri, 6 Oct 2017 19:02:35 +0300 Subject: gso: fix payload length when gso_size is zero From: Alexey Kodanev <alexey.kodanev(a)oracle.com> [ Upstream commit 3d0241d57c7b25bb75ac9d7a62753642264fdbce ] When gso_size reset to zero for the tail segment in skb_segment(), later in ipv6_gso_segment(), __skb_udp_tunnel_segment() and gre_gso_segment() we will get incorrect results (payload length, pcsum) for that segment. inet_gso_segment() already has a check for gso_size before calculating payload. The issue was found with LTP vxlan & gre tests over ixgbe NIC. Fixes: 07b26c9454a2 ("gso: Support partial splitting at the frag_list pointer") Signed-off-by: Alexey Kodanev <alexey.kodanev(a)oracle.com> Acked-by: Alexander Duyck <alexander.h.duyck(a)intel.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/ipv4/gre_offload.c | 2 +- net/ipv4/udp_offload.c | 2 +- net/ipv6/ip6_offload.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) --- a/net/ipv4/gre_offload.c +++ b/net/ipv4/gre_offload.c @@ -98,7 +98,7 @@ static struct sk_buff *gre_gso_segment(s greh = (struct gre_base_hdr *)skb_transport_header(skb); pcsum = (__sum16 *)(greh + 1); - if (gso_partial) { + if (gso_partial && skb_is_gso(skb)) { unsigned int partial_adj; /* Adjust checksum to account for the fact that --- a/net/ipv4/udp_offload.c +++ b/net/ipv4/udp_offload.c @@ -122,7 +122,7 @@ static struct sk_buff *__skb_udp_tunnel_ * will be using a length value equal to only one MSS sized * segment instead of the entire frame. */ - if (gso_partial) { + if (gso_partial && skb_is_gso(skb)) { uh->len = htons(skb_shinfo(skb)->gso_size + SKB_GSO_CB(skb)->data_offset + skb->head - (unsigned char *)uh); --- a/net/ipv6/ip6_offload.c +++ b/net/ipv6/ip6_offload.c @@ -105,7 +105,7 @@ static struct sk_buff *ipv6_gso_segment( for (skb = segs; skb; skb = skb->next) { ipv6h = (struct ipv6hdr *)(skb_mac_header(skb) + nhoff); - if (gso_partial) + if (gso_partial && skb_is_gso(skb)) payload_len = skb_shinfo(skb)->gso_size + SKB_GSO_CB(skb)->data_offset + skb->head - (unsigned char *)(ipv6h + 1); Patches currently in stable-queue which might be from alexey.kodanev(a)oracle.com are queue-4.9/gso-fix-payload-length-when-gso_size-is-zero.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "tun/tap: sanitize TUNSETSNDBUF input" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled tun/tap: sanitize TUNSETSNDBUF input to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: tun-tap-sanitize-tunsetsndbuf-input.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Craig Gallek <kraig(a)google.com> Date: Mon, 30 Oct 2017 18:50:11 -0400 Subject: tun/tap: sanitize TUNSETSNDBUF input From: Craig Gallek <kraig(a)google.com> [ Upstream commit 93161922c658c714715686cd0cf69b090cb9bf1d ] Syzkaller found several variants of the lockup below by setting negative values with the TUNSETSNDBUF ioctl. This patch adds a sanity check to both the tun and tap versions of this ioctl. watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [repro:2389] Modules linked in: irq event stamp: 329692056 hardirqs last enabled at (329692055): [<ffffffff824b8381>] _raw_spin_unlock_irqrestore+0x31/0x75 hardirqs last disabled at (329692056): [<ffffffff824b9e58>] apic_timer_interrupt+0x98/0xb0 softirqs last enabled at (35659740): [<ffffffff824bc958>] __do_softirq+0x328/0x48c softirqs last disabled at (35659731): [<ffffffff811c796c>] irq_exit+0xbc/0xd0 CPU: 0 PID: 2389 Comm: repro Not tainted 4.14.0-rc7 #23 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 task: ffff880009452140 task.stack: ffff880006a20000 RIP: 0010:_raw_spin_lock_irqsave+0x11/0x80 RSP: 0018:ffff880006a27c50 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: ffff880009ac68d0 RBX: ffff880006a27ce0 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffff880006a27ce0 RDI: ffff880009ac6900 RBP: ffff880006a27c60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 000000000063ff00 R12: ffff880009ac6900 R13: ffff880006a27cf8 R14: 0000000000000001 R15: ffff880006a27cf8 FS: 00007f4be4838700(0000) GS:ffff88000cc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020101000 CR3: 0000000009616000 CR4: 00000000000006f0 Call Trace: prepare_to_wait+0x26/0xc0 sock_alloc_send_pskb+0x14e/0x270 ? remove_wait_queue+0x60/0x60 tun_get_user+0x2cc/0x19d0 ? __tun_get+0x60/0x1b0 tun_chr_write_iter+0x57/0x86 __vfs_write+0x156/0x1e0 vfs_write+0xf7/0x230 SyS_write+0x57/0xd0 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x7f4be4356df9 RSP: 002b:00007ffc18101c08 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4be4356df9 RDX: 0000000000000046 RSI: 0000000020101000 RDI: 0000000000000005 RBP: 00007ffc18101c40 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000293 R12: 0000559c75f64780 R13: 00007ffc18101d30 R14: 0000000000000000 R15: 0000000000000000 Fixes: 33dccbb050bb ("tun: Limit amount of queued packets per device") Fixes: 20d29d7a916a ("net: macvtap driver") Signed-off-by: Craig Gallek <kraig(a)google.com> Reviewed-by: Eric Dumazet <edumazet(a)google.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- drivers/net/tap.c | 2 ++ drivers/net/tun.c | 4 ++++ 2 files changed, 6 insertions(+) --- a/drivers/net/tap.c +++ b/drivers/net/tap.c @@ -1035,6 +1035,8 @@ static long tap_ioctl(struct file *file, case TUNSETSNDBUF: if (get_user(s, sp)) return -EFAULT; + if (s <= 0) + return -EINVAL; q->sk.sk_sndbuf = s; return 0; --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -2219,6 +2219,10 @@ static long __tun_chr_ioctl(struct file ret = -EFAULT; break; } + if (sndbuf <= 0) { + ret = -EINVAL; + break; + } tun->sndbuf = sndbuf; tun_set_sndbuf(tun); Patches currently in stable-queue which might be from kraig(a)google.com are queue-4.13/soreuseport-fix-initialization-race.patch queue-4.13/tun-tap-sanitize-tunsetsndbuf-input.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "tun: call dev_get_valid_name() before register_netdevice()" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled tun: call dev_get_valid_name() before register_netdevice() to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: tun-call-dev_get_valid_name-before-register_netdevice.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Cong Wang <xiyou.wangcong(a)gmail.com> Date: Fri, 13 Oct 2017 11:58:53 -0700 Subject: tun: call dev_get_valid_name() before register_netdevice() From: Cong Wang <xiyou.wangcong(a)gmail.com> [ Upstream commit 0ad646c81b2182f7fa67ec0c8c825e0ee165696d ] register_netdevice() could fail early when we have an invalid dev name, in which case ->ndo_uninit() is not called. For tun device, this is a problem because a timer etc. are already initialized and it expects ->ndo_uninit() to clean them up. We could move these initializations into a ->ndo_init() so that register_netdevice() knows better, however this is still complicated due to the logic in tun_detach(). Therefore, I choose to just call dev_get_valid_name() before register_netdevice(), which is quicker and much easier to audit. And for this specific case, it is already enough. Fixes: 96442e42429e ("tuntap: choose the txq based on rxq") Reported-by: Dmitry Alexeev <avekceeb(a)gmail.com> Cc: Jason Wang <jasowang(a)redhat.com> Cc: "Michael S. Tsirkin" <mst(a)redhat.com> Signed-off-by: Cong Wang <xiyou.wangcong(a)gmail.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- drivers/net/tun.c | 3 +++ include/linux/netdevice.h | 3 +++ net/core/dev.c | 6 +++--- 3 files changed, 9 insertions(+), 3 deletions(-) --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1813,6 +1813,9 @@ static int tun_set_iff(struct net *net, if (!dev) return -ENOMEM; + err = dev_get_valid_name(net, dev, name); + if (err) + goto err_free_dev; dev_net_set(dev, net); dev->rtnl_link_ops = &tun_link_ops; --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3702,6 +3702,9 @@ struct net_device *alloc_netdev_mqs(int unsigned char name_assign_type, void (*setup)(struct net_device *), unsigned int txqs, unsigned int rxqs); +int dev_get_valid_name(struct net *net, struct net_device *dev, + const char *name); + #define alloc_netdev(sizeof_priv, name, name_assign_type, setup) \ alloc_netdev_mqs(sizeof_priv, name, name_assign_type, setup, 1, 1) --- a/net/core/dev.c +++ b/net/core/dev.c @@ -1146,9 +1146,8 @@ static int dev_alloc_name_ns(struct net return ret; } -static int dev_get_valid_name(struct net *net, - struct net_device *dev, - const char *name) +int dev_get_valid_name(struct net *net, struct net_device *dev, + const char *name) { BUG_ON(!net); @@ -1164,6 +1163,7 @@ static int dev_get_valid_name(struct net return 0; } +EXPORT_SYMBOL(dev_get_valid_name); /** * dev_change_name - change name of a device Patches currently in stable-queue which might be from xiyou.wangcong(a)gmail.com are queue-4.13/tun-call-dev_get_valid_name-before-register_netdevice.patch queue-4.13/net_sched-avoid-matching-qdisc-with-zero-handle.patch queue-4.13/tun-allow-positive-return-values-on-dev_get_valid_name-call.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "tun: allow positive return values on dev_get_valid_name() call" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled tun: allow positive return values on dev_get_valid_name() call to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: tun-allow-positive-return-values-on-dev_get_valid_name-call.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Julien Gomes <julien(a)arista.com> Date: Wed, 25 Oct 2017 11:50:50 -0700 Subject: tun: allow positive return values on dev_get_valid_name() call From: Julien Gomes <julien(a)arista.com> [ Upstream commit 5c25f65fd1e42685f7ccd80e0621829c105785d9 ] If the name argument of dev_get_valid_name() contains "%d", it will try to assign it a unit number in __dev__alloc_name() and return either the unit number (>= 0) or an error code (< 0). Considering positive values as error values prevent tun device creations relying this mechanism, therefor we should only consider negative values as errors here. Signed-off-by: Julien Gomes <julien(a)arista.com> Acked-by: Cong Wang <xiyou.wangcong(a)gmail.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- drivers/net/tun.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1814,7 +1814,7 @@ static int tun_set_iff(struct net *net, if (!dev) return -ENOMEM; err = dev_get_valid_name(net, dev, name); - if (err) + if (err < 0) goto err_free_dev; dev_net_set(dev, net); Patches currently in stable-queue which might be from julien(a)arista.com are queue-4.13/tun-allow-positive-return-values-on-dev_get_valid_name-call.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "tcp: refresh tp timestamp before tcp_mtu_probe()" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled tcp: refresh tp timestamp before tcp_mtu_probe() to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: tcp-refresh-tp-timestamp-before-tcp_mtu_probe.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Eric Dumazet <edumazet(a)google.com> Date: Thu, 26 Oct 2017 21:21:40 -0700 Subject: tcp: refresh tp timestamp before tcp_mtu_probe() From: Eric Dumazet <edumazet(a)google.com> [ Upstream commit ee1836aec4f5a977c1699a311db4d9027ef21ac8 ] In the unlikely event tcp_mtu_probe() is sending a packet, we want tp->tcp_mstamp being as accurate as possible. This means we need to call tcp_mstamp_refresh() a bit earlier in tcp_write_xmit(). Fixes: 385e20706fac ("tcp: use tp->tcp_mstamp in output path") Signed-off-by: Eric Dumazet <edumazet(a)google.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/ipv4/tcp_output.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2271,6 +2271,7 @@ static bool tcp_write_xmit(struct sock * sent_pkts = 0; + tcp_mstamp_refresh(tp); if (!push_one) { /* Do MTU probing. */ result = tcp_mtu_probe(sk); @@ -2282,7 +2283,6 @@ static bool tcp_write_xmit(struct sock * } max_segs = tcp_tso_segs(sk, mss_now); - tcp_mstamp_refresh(tp); while ((skb = tcp_send_head(sk))) { unsigned int limit; Patches currently in stable-queue which might be from edumazet(a)google.com are queue-4.13/tcp-refresh-tp-timestamp-before-tcp_mtu_probe.patch queue-4.13/net-call-cgroup_sk_alloc-earlier-in-sk_clone_lock.patch queue-4.13/tcp-dccp-fix-ireq-opt-races.patch queue-4.13/tcp-fix-tcp_mtu_probe-vs-highest_sack.patch queue-4.13/ipv6-addrconf-increment-ifp-refcount-before-ipv6_del_addr.patch queue-4.13/ipv6-flowlabel-do-not-leave-opt-tot_len-with-garbage.patch queue-4.13/packet-avoid-panic-in-packet_getsockopt.patch queue-4.13/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.13/net_sched-avoid-matching-qdisc-with-zero-handle.patch queue-4.13/tun-tap-sanitize-tunsetsndbuf-input.patch queue-4.13/tcp-dccp-fix-lockdep-splat-in-inet_csk_route_req.patch queue-4.13/tcp-dccp-fix-other-lockdep-splats-accessing-ireq_opt.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "tcp: fix tcp_mtu_probe() vs highest_sack" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled tcp: fix tcp_mtu_probe() vs highest_sack to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: tcp-fix-tcp_mtu_probe-vs-highest_sack.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Eric Dumazet <edumazet(a)google.com> Date: Mon, 30 Oct 2017 23:08:20 -0700 Subject: tcp: fix tcp_mtu_probe() vs highest_sack From: Eric Dumazet <edumazet(a)google.com> [ Upstream commit 2b7cda9c35d3b940eb9ce74b30bbd5eb30db493d ] Based on SNMP values provided by Roman, Yuchung made the observation that some crashes in tcp_sacktag_walk() might be caused by MTU probing. Looking at tcp_mtu_probe(), I found that when a new skb was placed in front of the write queue, we were not updating tcp highest sack. If one skb is freed because all its content was copied to the new skb (for MTU probing), then tp->highest_sack could point to a now freed skb. Bad things would then happen, including infinite loops. This patch renames tcp_highest_sack_combine() and uses it from tcp_mtu_probe() to fix the bug. Note that I also removed one test against tp->sacked_out, since we want to replace tp->highest_sack regardless of whatever condition, since keeping a stale pointer to freed skb is a recipe for disaster. Fixes: a47e5a988a57 ("[TCP]: Convert highest_sack to sk_buff to allow direct access") Signed-off-by: Eric Dumazet <edumazet(a)google.com> Reported-by: Alexei Starovoitov <alexei.starovoitov(a)gmail.com> Reported-by: Roman Gushchin <guro(a)fb.com> Reported-by: Oleksandr Natalenko <oleksandr(a)natalenko.name> Acked-by: Alexei Starovoitov <ast(a)kernel.org> Acked-by: Neal Cardwell <ncardwell(a)google.com> Acked-by: Yuchung Cheng <ycheng(a)google.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- include/net/tcp.h | 6 +++--- net/ipv4/tcp_output.c | 3 ++- 2 files changed, 5 insertions(+), 4 deletions(-) --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1750,12 +1750,12 @@ static inline void tcp_highest_sack_rese tcp_sk(sk)->highest_sack = tcp_write_queue_head(sk); } -/* Called when old skb is about to be deleted (to be combined with new skb) */ -static inline void tcp_highest_sack_combine(struct sock *sk, +/* Called when old skb is about to be deleted and replaced by new skb */ +static inline void tcp_highest_sack_replace(struct sock *sk, struct sk_buff *old, struct sk_buff *new) { - if (tcp_sk(sk)->sacked_out && (old == tcp_sk(sk)->highest_sack)) + if (old == tcp_highest_sack(sk)) tcp_sk(sk)->highest_sack = new; } --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -2094,6 +2094,7 @@ static int tcp_mtu_probe(struct sock *sk nskb->ip_summed = skb->ip_summed; tcp_insert_write_queue_before(nskb, skb, sk); + tcp_highest_sack_replace(sk, skb, nskb); len = 0; tcp_for_write_queue_from_safe(skb, next, sk) { @@ -2694,7 +2695,7 @@ static bool tcp_collapse_retrans(struct else if (!skb_shift(skb, next_skb, next_skb_size)) return false; } - tcp_highest_sack_combine(sk, next_skb, skb); + tcp_highest_sack_replace(sk, next_skb, skb); tcp_unlink_write_queue(next_skb, sk); Patches currently in stable-queue which might be from edumazet(a)google.com are queue-4.13/tcp-refresh-tp-timestamp-before-tcp_mtu_probe.patch queue-4.13/net-call-cgroup_sk_alloc-earlier-in-sk_clone_lock.patch queue-4.13/tcp-dccp-fix-ireq-opt-races.patch queue-4.13/tcp-fix-tcp_mtu_probe-vs-highest_sack.patch queue-4.13/ipv6-addrconf-increment-ifp-refcount-before-ipv6_del_addr.patch queue-4.13/ipv6-flowlabel-do-not-leave-opt-tot_len-with-garbage.patch queue-4.13/packet-avoid-panic-in-packet_getsockopt.patch queue-4.13/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.13/net_sched-avoid-matching-qdisc-with-zero-handle.patch queue-4.13/tun-tap-sanitize-tunsetsndbuf-input.patch queue-4.13/tcp-dccp-fix-lockdep-splat-in-inet_csk_route_req.patch queue-4.13/tcp-dccp-fix-other-lockdep-splats-accessing-ireq_opt.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "tcp/dccp: fix other lockdep splats accessing ireq_opt" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled tcp/dccp: fix other lockdep splats accessing ireq_opt to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: tcp-dccp-fix-other-lockdep-splats-accessing-ireq_opt.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Eric Dumazet <edumazet(a)google.com> Date: Tue, 24 Oct 2017 08:20:31 -0700 Subject: tcp/dccp: fix other lockdep splats accessing ireq_opt From: Eric Dumazet <edumazet(a)google.com> [ Upstream commit 06f877d613be3621604c2520ec0351d9fbdca15f ] In my first attempt to fix the lockdep splat, I forgot we could enter inet_csk_route_req() with a freshly allocated request socket, for which refcount has not yet been elevated, due to complex SLAB_TYPESAFE_BY_RCU rules. We either are in rcu_read_lock() section _or_ we own a refcount on the request. Correct RCU verb to use here is rcu_dereference_check(), although it is not possible to prove we actually own a reference on a shared refcount :/ In v2, I added ireq_opt_deref() helper and use in three places, to fix other possible splats. [ 49.844590] lockdep_rcu_suspicious+0xea/0xf3 [ 49.846487] inet_csk_route_req+0x53/0x14d [ 49.848334] tcp_v4_route_req+0xe/0x10 [ 49.850174] tcp_conn_request+0x31c/0x6a0 [ 49.851992] ? __lock_acquire+0x614/0x822 [ 49.854015] tcp_v4_conn_request+0x5a/0x79 [ 49.855957] ? tcp_v4_conn_request+0x5a/0x79 [ 49.858052] tcp_rcv_state_process+0x98/0xdcc [ 49.859990] ? sk_filter_trim_cap+0x2f6/0x307 [ 49.862085] tcp_v4_do_rcv+0xfc/0x145 [ 49.864055] ? tcp_v4_do_rcv+0xfc/0x145 [ 49.866173] tcp_v4_rcv+0x5ab/0xaf9 [ 49.868029] ip_local_deliver_finish+0x1af/0x2e7 [ 49.870064] ip_local_deliver+0x1b2/0x1c5 [ 49.871775] ? inet_del_offload+0x45/0x45 [ 49.873916] ip_rcv_finish+0x3f7/0x471 [ 49.875476] ip_rcv+0x3f1/0x42f [ 49.876991] ? ip_local_deliver_finish+0x2e7/0x2e7 [ 49.878791] __netif_receive_skb_core+0x6d3/0x950 [ 49.880701] ? process_backlog+0x7e/0x216 [ 49.882589] __netif_receive_skb+0x1d/0x5e [ 49.884122] process_backlog+0x10c/0x216 [ 49.885812] net_rx_action+0x147/0x3df Fixes: a6ca7abe53633 ("tcp/dccp: fix lockdep splat in inet_csk_route_req()") Fixes: c92e8c02fe66 ("tcp/dccp: fix ireq->opt races") Signed-off-by: Eric Dumazet <edumazet(a)google.com> Reported-by: kernel test robot <fengguang.wu(a)intel.com> Reported-by: Maciej Żenczykowski <maze(a)google.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- include/net/inet_sock.h | 6 ++++++ net/dccp/ipv4.c | 2 +- net/ipv4/inet_connection_sock.c | 4 ++-- net/ipv4/tcp_ipv4.c | 2 +- 4 files changed, 10 insertions(+), 4 deletions(-) --- a/include/net/inet_sock.h +++ b/include/net/inet_sock.h @@ -132,6 +132,12 @@ static inline int inet_request_bound_dev return sk->sk_bound_dev_if; } +static inline struct ip_options_rcu *ireq_opt_deref(const struct inet_request_sock *ireq) +{ + return rcu_dereference_check(ireq->ireq_opt, + refcount_read(&ireq->req.rsk_refcnt) > 0); +} + struct inet_cork { unsigned int flags; __be32 addr; --- a/net/dccp/ipv4.c +++ b/net/dccp/ipv4.c @@ -495,7 +495,7 @@ static int dccp_v4_send_response(const s ireq->ir_rmt_addr); err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr, ireq->ir_rmt_addr, - rcu_dereference(ireq->ireq_opt)); + ireq_opt_deref(ireq)); err = net_xmit_eval(err); } --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -540,8 +540,8 @@ struct dst_entry *inet_csk_route_req(con struct ip_options_rcu *opt; struct rtable *rt; - opt = rcu_dereference_protected(ireq->ireq_opt, - refcount_read(&req->rsk_refcnt) > 0); + opt = ireq_opt_deref(ireq); + flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark, RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, sk->sk_protocol, inet_sk_flowi_flags(sk), --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -878,7 +878,7 @@ static int tcp_v4_send_synack(const stru err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr, ireq->ir_rmt_addr, - rcu_dereference(ireq->ireq_opt)); + ireq_opt_deref(ireq)); err = net_xmit_eval(err); } Patches currently in stable-queue which might be from edumazet(a)google.com are queue-4.13/tcp-refresh-tp-timestamp-before-tcp_mtu_probe.patch queue-4.13/net-call-cgroup_sk_alloc-earlier-in-sk_clone_lock.patch queue-4.13/tcp-dccp-fix-ireq-opt-races.patch queue-4.13/tcp-fix-tcp_mtu_probe-vs-highest_sack.patch queue-4.13/ipv6-addrconf-increment-ifp-refcount-before-ipv6_del_addr.patch queue-4.13/ipv6-flowlabel-do-not-leave-opt-tot_len-with-garbage.patch queue-4.13/packet-avoid-panic-in-packet_getsockopt.patch queue-4.13/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.13/net_sched-avoid-matching-qdisc-with-zero-handle.patch queue-4.13/tun-tap-sanitize-tunsetsndbuf-input.patch queue-4.13/tcp-dccp-fix-lockdep-splat-in-inet_csk_route_req.patch queue-4.13/tcp-dccp-fix-other-lockdep-splats-accessing-ireq_opt.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "tcp/dccp: fix lockdep splat in inet_csk_route_req()" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled tcp/dccp: fix lockdep splat in inet_csk_route_req() to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: tcp-dccp-fix-lockdep-splat-in-inet_csk_route_req.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Eric Dumazet <edumazet(a)google.com> Date: Sun, 22 Oct 2017 12:33:57 -0700 Subject: tcp/dccp: fix lockdep splat in inet_csk_route_req() From: Eric Dumazet <edumazet(a)google.com> [ Upstream commit a6ca7abe53633d08eea1c6756cb49c9b2d4c90bf ] This patch fixes the following lockdep splat in inet_csk_route_req() lockdep_rcu_suspicious inet_csk_route_req tcp_v4_send_synack tcp_rtx_synack inet_rtx_syn_ack tcp_fastopen_synack_time tcp_retransmit_timer tcp_write_timer_handler tcp_write_timer call_timer_fn Thread running inet_csk_route_req() owns a reference on the request socket, so we have the guarantee ireq->ireq_opt wont be changed or freed. lockdep can enforce this invariant for us. Fixes: c92e8c02fe66 ("tcp/dccp: fix ireq->opt races") Signed-off-by: Eric Dumazet <edumazet(a)google.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/ipv4/inet_connection_sock.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -540,7 +540,8 @@ struct dst_entry *inet_csk_route_req(con struct ip_options_rcu *opt; struct rtable *rt; - opt = rcu_dereference(ireq->ireq_opt); + opt = rcu_dereference_protected(ireq->ireq_opt, + refcount_read(&req->rsk_refcnt) > 0); flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark, RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, sk->sk_protocol, inet_sk_flowi_flags(sk), Patches currently in stable-queue which might be from edumazet(a)google.com are queue-4.13/tcp-refresh-tp-timestamp-before-tcp_mtu_probe.patch queue-4.13/net-call-cgroup_sk_alloc-earlier-in-sk_clone_lock.patch queue-4.13/tcp-dccp-fix-ireq-opt-races.patch queue-4.13/tcp-fix-tcp_mtu_probe-vs-highest_sack.patch queue-4.13/ipv6-addrconf-increment-ifp-refcount-before-ipv6_del_addr.patch queue-4.13/ipv6-flowlabel-do-not-leave-opt-tot_len-with-garbage.patch queue-4.13/packet-avoid-panic-in-packet_getsockopt.patch queue-4.13/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.13/net_sched-avoid-matching-qdisc-with-zero-handle.patch queue-4.13/tun-tap-sanitize-tunsetsndbuf-input.patch queue-4.13/tcp-dccp-fix-lockdep-splat-in-inet_csk_route_req.patch queue-4.13/tcp-dccp-fix-other-lockdep-splats-accessing-ireq_opt.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "tcp/dccp: fix ireq->opt races" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled tcp/dccp: fix ireq->opt races to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: tcp-dccp-fix-ireq-opt-races.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Eric Dumazet <edumazet(a)google.com> Date: Fri, 20 Oct 2017 09:04:13 -0700 Subject: tcp/dccp: fix ireq->opt races From: Eric Dumazet <edumazet(a)google.com> [ Upstream commit c92e8c02fe664155ac4234516e32544bec0f113d ] syzkaller found another bug in DCCP/TCP stacks [1] For the reasons explained in commit ce1050089c96 ("tcp/dccp: fix ireq->pktopts race"), we need to make sure we do not access ireq->opt unless we own the request sock. Note the opt field is renamed to ireq_opt to ease grep games. [1] BUG: KASAN: use-after-free in ip_queue_xmit+0x1687/0x18e0 net/ipv4/ip_output.c:474 Read of size 1 at addr ffff8801c951039c by task syz-executor5/3295 CPU: 1 PID: 3295 Comm: syz-executor5 Not tainted 4.14.0-rc4+ #80 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x25b/0x340 mm/kasan/report.c:409 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:427 ip_queue_xmit+0x1687/0x18e0 net/ipv4/ip_output.c:474 tcp_transmit_skb+0x1ab7/0x3840 net/ipv4/tcp_output.c:1135 tcp_send_ack.part.37+0x3bb/0x650 net/ipv4/tcp_output.c:3587 tcp_send_ack+0x49/0x60 net/ipv4/tcp_output.c:3557 __tcp_ack_snd_check+0x2c6/0x4b0 net/ipv4/tcp_input.c:5072 tcp_ack_snd_check net/ipv4/tcp_input.c:5085 [inline] tcp_rcv_state_process+0x2eff/0x4850 net/ipv4/tcp_input.c:6071 tcp_child_process+0x342/0x990 net/ipv4/tcp_minisocks.c:816 tcp_v4_rcv+0x1827/0x2f80 net/ipv4/tcp_ipv4.c:1682 ip_local_deliver_finish+0x2e2/0xba0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:249 [inline] ip_local_deliver+0x1ce/0x6e0 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:464 [inline] ip_rcv_finish+0x887/0x19a0 net/ipv4/ip_input.c:397 NF_HOOK include/linux/netfilter.h:249 [inline] ip_rcv+0xc3f/0x1820 net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x1a3e/0x34b0 net/core/dev.c:4476 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4514 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4587 netif_receive_skb+0xae/0x390 net/core/dev.c:4611 tun_rx_batched.isra.50+0x5ed/0x860 drivers/net/tun.c:1372 tun_get_user+0x249c/0x36d0 drivers/net/tun.c:1766 tun_chr_write_iter+0xbf/0x160 drivers/net/tun.c:1792 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe RIP: 0033:0x40c341 RSP: 002b:00007f469523ec10 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 000000000040c341 RDX: 0000000000000037 RSI: 0000000020004000 RDI: 0000000000000015 RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000f4240 R11: 0000000000000293 R12: 00000000004b7fd1 R13: 00000000ffffffff R14: 0000000020000000 R15: 0000000000025000 Allocated by task 3295: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 __do_kmalloc mm/slab.c:3725 [inline] __kmalloc+0x162/0x760 mm/slab.c:3734 kmalloc include/linux/slab.h:498 [inline] tcp_v4_save_options include/net/tcp.h:1962 [inline] tcp_v4_init_req+0x2d3/0x3e0 net/ipv4/tcp_ipv4.c:1271 tcp_conn_request+0xf6d/0x3410 net/ipv4/tcp_input.c:6283 tcp_v4_conn_request+0x157/0x210 net/ipv4/tcp_ipv4.c:1313 tcp_rcv_state_process+0x8ea/0x4850 net/ipv4/tcp_input.c:5857 tcp_v4_do_rcv+0x55c/0x7d0 net/ipv4/tcp_ipv4.c:1482 tcp_v4_rcv+0x2d10/0x2f80 net/ipv4/tcp_ipv4.c:1711 ip_local_deliver_finish+0x2e2/0xba0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:249 [inline] ip_local_deliver+0x1ce/0x6e0 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:464 [inline] ip_rcv_finish+0x887/0x19a0 net/ipv4/ip_input.c:397 NF_HOOK include/linux/netfilter.h:249 [inline] ip_rcv+0xc3f/0x1820 net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x1a3e/0x34b0 net/core/dev.c:4476 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4514 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4587 netif_receive_skb+0xae/0x390 net/core/dev.c:4611 tun_rx_batched.isra.50+0x5ed/0x860 drivers/net/tun.c:1372 tun_get_user+0x249c/0x36d0 drivers/net/tun.c:1766 tun_chr_write_iter+0xbf/0x160 drivers/net/tun.c:1792 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe Freed by task 3306: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3503 [inline] kfree+0xca/0x250 mm/slab.c:3820 inet_sock_destruct+0x59d/0x950 net/ipv4/af_inet.c:157 __sk_destruct+0xfd/0x910 net/core/sock.c:1560 sk_destruct+0x47/0x80 net/core/sock.c:1595 __sk_free+0x57/0x230 net/core/sock.c:1603 sk_free+0x2a/0x40 net/core/sock.c:1614 sock_put include/net/sock.h:1652 [inline] inet_csk_complete_hashdance+0xd5/0xf0 net/ipv4/inet_connection_sock.c:959 tcp_check_req+0xf4d/0x1620 net/ipv4/tcp_minisocks.c:765 tcp_v4_rcv+0x17f6/0x2f80 net/ipv4/tcp_ipv4.c:1675 ip_local_deliver_finish+0x2e2/0xba0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:249 [inline] ip_local_deliver+0x1ce/0x6e0 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:464 [inline] ip_rcv_finish+0x887/0x19a0 net/ipv4/ip_input.c:397 NF_HOOK include/linux/netfilter.h:249 [inline] ip_rcv+0xc3f/0x1820 net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x1a3e/0x34b0 net/core/dev.c:4476 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4514 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4587 netif_receive_skb+0xae/0x390 net/core/dev.c:4611 tun_rx_batched.isra.50+0x5ed/0x860 drivers/net/tun.c:1372 tun_get_user+0x249c/0x36d0 drivers/net/tun.c:1766 tun_chr_write_iter+0xbf/0x160 drivers/net/tun.c:1792 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 entry_SYSCALL_64_fastpath+0x1f/0xbe Fixes: e994b2f0fb92 ("tcp: do not lock listener to process SYN packets") Fixes: 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table") Signed-off-by: Eric Dumazet <edumazet(a)google.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- include/net/inet_sock.h | 2 +- net/dccp/ipv4.c | 13 ++++++++----- net/ipv4/cipso_ipv4.c | 24 +++++++----------------- net/ipv4/inet_connection_sock.c | 8 +++----- net/ipv4/syncookies.c | 2 +- net/ipv4/tcp_input.c | 2 +- net/ipv4/tcp_ipv4.c | 21 ++++++++++++--------- 7 files changed, 33 insertions(+), 39 deletions(-) --- a/include/net/inet_sock.h +++ b/include/net/inet_sock.h @@ -96,7 +96,7 @@ struct inet_request_sock { kmemcheck_bitfield_end(flags); u32 ir_mark; union { - struct ip_options_rcu *opt; + struct ip_options_rcu __rcu *ireq_opt; #if IS_ENABLED(CONFIG_IPV6) struct { struct ipv6_txoptions *ipv6_opt; --- a/net/dccp/ipv4.c +++ b/net/dccp/ipv4.c @@ -414,8 +414,7 @@ struct sock *dccp_v4_request_recv_sock(c sk_daddr_set(newsk, ireq->ir_rmt_addr); sk_rcv_saddr_set(newsk, ireq->ir_loc_addr); newinet->inet_saddr = ireq->ir_loc_addr; - newinet->inet_opt = ireq->opt; - ireq->opt = NULL; + RCU_INIT_POINTER(newinet->inet_opt, rcu_dereference(ireq->ireq_opt)); newinet->mc_index = inet_iif(skb); newinet->mc_ttl = ip_hdr(skb)->ttl; newinet->inet_id = jiffies; @@ -430,7 +429,10 @@ struct sock *dccp_v4_request_recv_sock(c if (__inet_inherit_port(sk, newsk) < 0) goto put_and_exit; *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); - + if (*own_req) + ireq->ireq_opt = NULL; + else + newinet->inet_opt = NULL; return newsk; exit_overflow: @@ -441,6 +443,7 @@ exit: __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENDROPS); return NULL; put_and_exit: + newinet->inet_opt = NULL; inet_csk_prepare_forced_close(newsk); dccp_done(newsk); goto exit; @@ -492,7 +495,7 @@ static int dccp_v4_send_response(const s ireq->ir_rmt_addr); err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr, ireq->ir_rmt_addr, - ireq->opt); + rcu_dereference(ireq->ireq_opt)); err = net_xmit_eval(err); } @@ -548,7 +551,7 @@ out: static void dccp_v4_reqsk_destructor(struct request_sock *req) { dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg); - kfree(inet_rsk(req)->opt); + kfree(rcu_dereference_protected(inet_rsk(req)->ireq_opt, 1)); } void dccp_syn_ack_timeout(const struct request_sock *req) --- a/net/ipv4/cipso_ipv4.c +++ b/net/ipv4/cipso_ipv4.c @@ -1951,7 +1951,7 @@ int cipso_v4_req_setattr(struct request_ buf = NULL; req_inet = inet_rsk(req); - opt = xchg(&req_inet->opt, opt); + opt = xchg((__force struct ip_options_rcu **)&req_inet->ireq_opt, opt); if (opt) kfree_rcu(opt, rcu); @@ -1973,11 +1973,13 @@ req_setattr_failure: * values on failure. * */ -static int cipso_v4_delopt(struct ip_options_rcu **opt_ptr) +static int cipso_v4_delopt(struct ip_options_rcu __rcu **opt_ptr) { + struct ip_options_rcu *opt = rcu_dereference_protected(*opt_ptr, 1); int hdr_delta = 0; - struct ip_options_rcu *opt = *opt_ptr; + if (!opt || opt->opt.cipso == 0) + return 0; if (opt->opt.srr || opt->opt.rr || opt->opt.ts || opt->opt.router_alert) { u8 cipso_len; u8 cipso_off; @@ -2039,14 +2041,10 @@ static int cipso_v4_delopt(struct ip_opt */ void cipso_v4_sock_delattr(struct sock *sk) { - int hdr_delta; - struct ip_options_rcu *opt; struct inet_sock *sk_inet; + int hdr_delta; sk_inet = inet_sk(sk); - opt = rcu_dereference_protected(sk_inet->inet_opt, 1); - if (!opt || opt->opt.cipso == 0) - return; hdr_delta = cipso_v4_delopt(&sk_inet->inet_opt); if (sk_inet->is_icsk && hdr_delta > 0) { @@ -2066,15 +2064,7 @@ void cipso_v4_sock_delattr(struct sock * */ void cipso_v4_req_delattr(struct request_sock *req) { - struct ip_options_rcu *opt; - struct inet_request_sock *req_inet; - - req_inet = inet_rsk(req); - opt = req_inet->opt; - if (!opt || opt->opt.cipso == 0) - return; - - cipso_v4_delopt(&req_inet->opt); + cipso_v4_delopt(&inet_rsk(req)->ireq_opt); } /** --- a/net/ipv4/inet_connection_sock.c +++ b/net/ipv4/inet_connection_sock.c @@ -537,9 +537,10 @@ struct dst_entry *inet_csk_route_req(con { const struct inet_request_sock *ireq = inet_rsk(req); struct net *net = read_pnet(&ireq->ireq_net); - struct ip_options_rcu *opt = ireq->opt; + struct ip_options_rcu *opt; struct rtable *rt; + opt = rcu_dereference(ireq->ireq_opt); flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark, RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, sk->sk_protocol, inet_sk_flowi_flags(sk), @@ -573,10 +574,9 @@ struct dst_entry *inet_csk_route_child_s struct flowi4 *fl4; struct rtable *rt; + opt = rcu_dereference(ireq->ireq_opt); fl4 = &newinet->cork.fl.u.ip4; - rcu_read_lock(); - opt = rcu_dereference(newinet->inet_opt); flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark, RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, sk->sk_protocol, inet_sk_flowi_flags(sk), @@ -589,13 +589,11 @@ struct dst_entry *inet_csk_route_child_s goto no_route; if (opt && opt->opt.is_strictroute && rt->rt_uses_gateway) goto route_err; - rcu_read_unlock(); return &rt->dst; route_err: ip_rt_put(rt); no_route: - rcu_read_unlock(); __IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); return NULL; } --- a/net/ipv4/syncookies.c +++ b/net/ipv4/syncookies.c @@ -355,7 +355,7 @@ struct sock *cookie_v4_check(struct sock /* We throwed the options of the initial SYN away, so we hope * the ACK carries the same options again (see RFC1122 4.2.3.8) */ - ireq->opt = tcp_v4_save_options(skb); + RCU_INIT_POINTER(ireq->ireq_opt, tcp_v4_save_options(skb)); if (security_inet_conn_request(sk, skb, req)) { reqsk_free(req); --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -6235,7 +6235,7 @@ struct request_sock *inet_reqsk_alloc(co struct inet_request_sock *ireq = inet_rsk(req); kmemcheck_annotate_bitfield(ireq, flags); - ireq->opt = NULL; + ireq->ireq_opt = NULL; #if IS_ENABLED(CONFIG_IPV6) ireq->pktopts = NULL; #endif --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -878,7 +878,7 @@ static int tcp_v4_send_synack(const stru err = ip_build_and_send_pkt(skb, sk, ireq->ir_loc_addr, ireq->ir_rmt_addr, - ireq->opt); + rcu_dereference(ireq->ireq_opt)); err = net_xmit_eval(err); } @@ -890,7 +890,7 @@ static int tcp_v4_send_synack(const stru */ static void tcp_v4_reqsk_destructor(struct request_sock *req) { - kfree(inet_rsk(req)->opt); + kfree(rcu_dereference_protected(inet_rsk(req)->ireq_opt, 1)); } #ifdef CONFIG_TCP_MD5SIG @@ -1269,7 +1269,7 @@ static void tcp_v4_init_req(struct reque sk_rcv_saddr_set(req_to_sk(req), ip_hdr(skb)->daddr); sk_daddr_set(req_to_sk(req), ip_hdr(skb)->saddr); - ireq->opt = tcp_v4_save_options(skb); + RCU_INIT_POINTER(ireq->ireq_opt, tcp_v4_save_options(skb)); } static struct dst_entry *tcp_v4_route_req(const struct sock *sk, @@ -1356,10 +1356,9 @@ struct sock *tcp_v4_syn_recv_sock(const sk_daddr_set(newsk, ireq->ir_rmt_addr); sk_rcv_saddr_set(newsk, ireq->ir_loc_addr); newsk->sk_bound_dev_if = ireq->ir_iif; - newinet->inet_saddr = ireq->ir_loc_addr; - inet_opt = ireq->opt; - rcu_assign_pointer(newinet->inet_opt, inet_opt); - ireq->opt = NULL; + newinet->inet_saddr = ireq->ir_loc_addr; + inet_opt = rcu_dereference(ireq->ireq_opt); + RCU_INIT_POINTER(newinet->inet_opt, inet_opt); newinet->mc_index = inet_iif(skb); newinet->mc_ttl = ip_hdr(skb)->ttl; newinet->rcv_tos = ip_hdr(skb)->tos; @@ -1404,9 +1403,12 @@ struct sock *tcp_v4_syn_recv_sock(const if (__inet_inherit_port(sk, newsk) < 0) goto put_and_exit; *own_req = inet_ehash_nolisten(newsk, req_to_sk(req_unhash)); - if (*own_req) + if (likely(*own_req)) { tcp_move_syn(newtp, req); - + ireq->ireq_opt = NULL; + } else { + newinet->inet_opt = NULL; + } return newsk; exit_overflow: @@ -1417,6 +1419,7 @@ exit: tcp_listendrop(sk); return NULL; put_and_exit: + newinet->inet_opt = NULL; inet_csk_prepare_forced_close(newsk); tcp_done(newsk); goto exit; Patches currently in stable-queue which might be from edumazet(a)google.com are queue-4.13/tcp-refresh-tp-timestamp-before-tcp_mtu_probe.patch queue-4.13/net-call-cgroup_sk_alloc-earlier-in-sk_clone_lock.patch queue-4.13/tcp-dccp-fix-ireq-opt-races.patch queue-4.13/tcp-fix-tcp_mtu_probe-vs-highest_sack.patch queue-4.13/ipv6-addrconf-increment-ifp-refcount-before-ipv6_del_addr.patch queue-4.13/ipv6-flowlabel-do-not-leave-opt-tot_len-with-garbage.patch queue-4.13/packet-avoid-panic-in-packet_getsockopt.patch queue-4.13/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.13/net_sched-avoid-matching-qdisc-with-zero-handle.patch queue-4.13/tun-tap-sanitize-tunsetsndbuf-input.patch queue-4.13/tcp-dccp-fix-lockdep-splat-in-inet_csk_route_req.patch queue-4.13/tcp-dccp-fix-other-lockdep-splats-accessing-ireq_opt.patch

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[Linux-stable-mirror] Patch "tap: reference to KVA of an unloaded module causes kernel panic" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled tap: reference to KVA of an unloaded module causes kernel panic to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: tap-reference-to-kva-of-an-unloaded-module-causes-kernel-panic.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Girish Moodalbail <girish.moodalbail(a)oracle.com> Date: Fri, 27 Oct 2017 00:00:16 -0700 Subject: tap: reference to KVA of an unloaded module causes kernel panic From: Girish Moodalbail <girish.moodalbail(a)oracle.com> [ Upstream commit dea6e19f4ef746aa18b4c33d1a7fed54356796ed ] The commit 9a393b5d5988 ("tap: tap as an independent module") created a separate tap module that implements tap functionality and exports interfaces that will be used by macvtap and ipvtap modules to create create respective tap devices. However, that patch introduced a regression wherein the modules macvtap and ipvtap can be removed (through modprobe -r) while there are applications using the respective /dev/tapX devices. These applications cause kernel to hold reference to /dev/tapX through 'struct cdev macvtap_cdev' and 'struct cdev ipvtap_dev' defined in macvtap and ipvtap modules respectively. So, when the application is later closed the kernel panics because we are referencing KVA that is present in the unloaded modules. ----------8<------- Example ----------8<---------- $ sudo ip li add name mv0 link enp7s0 type macvtap $ sudo ip li show mv0 |grep mv0| awk -e '{print $1 $2}' 14:mv0@enp7s0: $ cat /dev/tap14 & $ lsmod |egrep -i 'tap|vlan' macvtap 16384 0 macvlan 24576 1 macvtap tap 24576 3 macvtap $ sudo modprobe -r macvtap $ fg cat /dev/tap14 ^C <...system panics...> BUG: unable to handle kernel paging request at ffffffffa038c500 IP: cdev_put+0xf/0x30 ----------8<-----------------8<---------- The fix is to set cdev.owner to the module that creates the tap device (either macvtap or ipvtap). With this set, the operations (in fs/char_dev.c) on char device holds and releases the module through cdev_get() and cdev_put() and will not allow the module to unload prematurely. Fixes: 9a393b5d5988ea4e (tap: tap as an independent module) Signed-off-by: Girish Moodalbail <girish.moodalbail(a)oracle.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- drivers/net/ipvlan/ipvtap.c | 4 ++-- drivers/net/macvtap.c | 4 ++-- drivers/net/tap.c | 5 +++-- include/linux/if_tap.h | 4 ++-- 4 files changed, 9 insertions(+), 8 deletions(-) --- a/drivers/net/ipvlan/ipvtap.c +++ b/drivers/net/ipvlan/ipvtap.c @@ -197,8 +197,8 @@ static int ipvtap_init(void) { int err; - err = tap_create_cdev(&ipvtap_cdev, &ipvtap_major, "ipvtap"); - + err = tap_create_cdev(&ipvtap_cdev, &ipvtap_major, "ipvtap", + THIS_MODULE); if (err) goto out1; --- a/drivers/net/macvtap.c +++ b/drivers/net/macvtap.c @@ -204,8 +204,8 @@ static int macvtap_init(void) { int err; - err = tap_create_cdev(&macvtap_cdev, &macvtap_major, "macvtap"); - + err = tap_create_cdev(&macvtap_cdev, &macvtap_major, "macvtap", + THIS_MODULE); if (err) goto out1; --- a/drivers/net/tap.c +++ b/drivers/net/tap.c @@ -1252,8 +1252,8 @@ static int tap_list_add(dev_t major, con return 0; } -int tap_create_cdev(struct cdev *tap_cdev, - dev_t *tap_major, const char *device_name) +int tap_create_cdev(struct cdev *tap_cdev, dev_t *tap_major, + const char *device_name, struct module *module) { int err; @@ -1262,6 +1262,7 @@ int tap_create_cdev(struct cdev *tap_cde goto out1; cdev_init(tap_cdev, &tap_fops); + tap_cdev->owner = module; err = cdev_add(tap_cdev, *tap_major, TAP_NUM_DEVS); if (err) goto out2; --- a/include/linux/if_tap.h +++ b/include/linux/if_tap.h @@ -73,8 +73,8 @@ void tap_del_queues(struct tap_dev *tap) int tap_get_minor(dev_t major, struct tap_dev *tap); void tap_free_minor(dev_t major, struct tap_dev *tap); int tap_queue_resize(struct tap_dev *tap); -int tap_create_cdev(struct cdev *tap_cdev, - dev_t *tap_major, const char *device_name); +int tap_create_cdev(struct cdev *tap_cdev, dev_t *tap_major, + const char *device_name, struct module *module); void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev); #endif /*_LINUX_IF_TAP_H_*/ Patches currently in stable-queue which might be from girish.moodalbail(a)oracle.com are queue-4.13/tap-reference-to-kva-of-an-unloaded-module-causes-kernel-panic.patch queue-4.13/tap-double-free-in-error-path-in-tap_open.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "soreuseport: fix initialization race" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled soreuseport: fix initialization race to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: soreuseport-fix-initialization-race.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Craig Gallek <kraig(a)google.com> Date: Thu, 19 Oct 2017 15:00:29 -0400 Subject: soreuseport: fix initialization race From: Craig Gallek <kraig(a)google.com> [ Upstream commit 1b5f962e71bfad6284574655c406597535c3ea7a ] Syzkaller stumbled upon a way to trigger WARNING: CPU: 1 PID: 13881 at net/core/sock_reuseport.c:41 reuseport_alloc+0x306/0x3b0 net/core/sock_reuseport.c:39 There are two initialization paths for the sock_reuseport structure in a socket: Through the udp/tcp bind paths of SO_REUSEPORT sockets or through SO_ATTACH_REUSEPORT_[CE]BPF before bind. The existing implementation assumedthat the socket lock protected both of these paths when it actually only protects the SO_ATTACH_REUSEPORT path. Syzkaller triggered this double allocation by running these paths concurrently. This patch moves the check for double allocation into the reuseport_alloc function which is protected by a global spin lock. Fixes: e32ea7e74727 ("soreuseport: fast reuseport UDP socket selection") Fixes: c125e80b8868 ("soreuseport: fast reuseport TCP socket selection") Signed-off-by: Craig Gallek <kraig(a)google.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/core/sock_reuseport.c | 12 +++++++++--- net/ipv4/inet_hashtables.c | 5 +---- net/ipv4/udp.c | 5 +---- 3 files changed, 11 insertions(+), 11 deletions(-) --- a/net/core/sock_reuseport.c +++ b/net/core/sock_reuseport.c @@ -36,9 +36,14 @@ int reuseport_alloc(struct sock *sk) * soft irq of receive path or setsockopt from process context */ spin_lock_bh(&reuseport_lock); - WARN_ONCE(rcu_dereference_protected(sk->sk_reuseport_cb, - lockdep_is_held(&reuseport_lock)), - "multiple allocations for the same socket"); + + /* Allocation attempts can occur concurrently via the setsockopt path + * and the bind/hash path. Nothing to do when we lose the race. + */ + if (rcu_dereference_protected(sk->sk_reuseport_cb, + lockdep_is_held(&reuseport_lock))) + goto out; + reuse = __reuseport_alloc(INIT_SOCKS); if (!reuse) { spin_unlock_bh(&reuseport_lock); @@ -49,6 +54,7 @@ int reuseport_alloc(struct sock *sk) reuse->num_socks = 1; rcu_assign_pointer(sk->sk_reuseport_cb, reuse); +out: spin_unlock_bh(&reuseport_lock); return 0; --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -449,10 +449,7 @@ static int inet_reuseport_add_sock(struc return reuseport_add_sock(sk, sk2); } - /* Initial allocation may have already happened via setsockopt */ - if (!rcu_access_pointer(sk->sk_reuseport_cb)) - return reuseport_alloc(sk); - return 0; + return reuseport_alloc(sk); } int __inet_hash(struct sock *sk, struct sock *osk) --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -231,10 +231,7 @@ static int udp_reuseport_add_sock(struct } } - /* Initial allocation may have already happened via setsockopt */ - if (!rcu_access_pointer(sk->sk_reuseport_cb)) - return reuseport_alloc(sk); - return 0; + return reuseport_alloc(sk); } /** Patches currently in stable-queue which might be from kraig(a)google.com are queue-4.13/soreuseport-fix-initialization-race.patch queue-4.13/tun-tap-sanitize-tunsetsndbuf-input.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "tap: double-free in error path in tap_open()" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled tap: double-free in error path in tap_open() to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: tap-double-free-in-error-path-in-tap_open.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Girish Moodalbail <girish.moodalbail(a)oracle.com> Date: Wed, 25 Oct 2017 00:23:04 -0700 Subject: tap: double-free in error path in tap_open() From: Girish Moodalbail <girish.moodalbail(a)oracle.com> [ Upstream commit 78e0ea6791d7baafb8a0ca82b1bd0c7b3453c919 ] Double free of skb_array in tap module is causing kernel panic. When tap_set_queue() fails we free skb_array right away by calling skb_array_cleanup(). However, later on skb_array_cleanup() is called again by tap_sock_destruct through sock_put(). This patch fixes that issue. Fixes: 362899b8725b35e3 (macvtap: switch to use skb array) Signed-off-by: Girish Moodalbail <girish.moodalbail(a)oracle.com> Acked-by: Jason Wang <jasowang(a)redhat.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- drivers/net/tap.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) --- a/drivers/net/tap.c +++ b/drivers/net/tap.c @@ -517,6 +517,10 @@ static int tap_open(struct inode *inode, &tap_proto, 0); if (!q) goto err; + if (skb_array_init(&q->skb_array, tap->dev->tx_queue_len, GFP_KERNEL)) { + sk_free(&q->sk); + goto err; + } RCU_INIT_POINTER(q->sock.wq, &q->wq); init_waitqueue_head(&q->wq.wait); @@ -540,22 +544,18 @@ static int tap_open(struct inode *inode, if ((tap->dev->features & NETIF_F_HIGHDMA) && (tap->dev->features & NETIF_F_SG)) sock_set_flag(&q->sk, SOCK_ZEROCOPY); - err = -ENOMEM; - if (skb_array_init(&q->skb_array, tap->dev->tx_queue_len, GFP_KERNEL)) - goto err_array; - err = tap_set_queue(tap, file, q); - if (err) - goto err_queue; + if (err) { + /* tap_sock_destruct() will take care of freeing skb_array */ + goto err_put; + } dev_put(tap->dev); rtnl_unlock(); return err; -err_queue: - skb_array_cleanup(&q->skb_array); -err_array: +err_put: sock_put(&q->sk); err: if (tap) Patches currently in stable-queue which might be from girish.moodalbail(a)oracle.com are queue-4.13/tap-reference-to-kva-of-an-unloaded-module-causes-kernel-panic.patch queue-4.13/tap-double-free-in-error-path-in-tap_open.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "sctp: reset owner sk for data chunks on out queues when migrating a sock" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled sctp: reset owner sk for data chunks on out queues when migrating a sock to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: sctp-reset-owner-sk-for-data-chunks-on-out-queues-when-migrating-a-sock.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Xin Long <lucien.xin(a)gmail.com> Date: Sat, 28 Oct 2017 02:13:29 +0800 Subject: sctp: reset owner sk for data chunks on out queues when migrating a sock From: Xin Long <lucien.xin(a)gmail.com> [ Upstream commit d04adf1b355181e737b6b1e23d801b07f0b7c4c0 ] Now when migrating sock to another one in sctp_sock_migrate(), it only resets owner sk for the data in receive queues, not the chunks on out queues. It would cause that data chunks length on the sock is not consistent with sk sk_wmem_alloc. When closing the sock or freeing these chunks, the old sk would never be freed, and the new sock may crash due to the overflow sk_wmem_alloc. syzbot found this issue with this series: r0 = socket$inet_sctp() sendto$inet(r0) listen(r0) accept4(r0) close(r0) Although listen() should have returned error when one TCP-style socket is in connecting (I may fix this one in another patch), it could also be reproduced by peeling off an assoc. This issue is there since very beginning. This patch is to reset owner sk for the chunks on out queues so that sk sk_wmem_alloc has correct value after accept one sock or peeloff an assoc to one sock. Note that when resetting owner sk for chunks on outqueue, it has to sctp_clear_owner_w/skb_orphan chunks before changing assoc->base.sk first and then sctp_set_owner_w them after changing assoc->base.sk, due to that sctp_wfree and it's callees are using assoc->base.sk. Reported-by: Dmitry Vyukov <dvyukov(a)google.com> Signed-off-by: Xin Long <lucien.xin(a)gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner(a)gmail.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/sctp/socket.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -169,6 +169,36 @@ static inline void sctp_set_owner_w(stru sk_mem_charge(sk, chunk->skb->truesize); } +static void sctp_clear_owner_w(struct sctp_chunk *chunk) +{ + skb_orphan(chunk->skb); +} + +static void sctp_for_each_tx_datachunk(struct sctp_association *asoc, + void (*cb)(struct sctp_chunk *)) + +{ + struct sctp_outq *q = &asoc->outqueue; + struct sctp_transport *t; + struct sctp_chunk *chunk; + + list_for_each_entry(t, &asoc->peer.transport_addr_list, transports) + list_for_each_entry(chunk, &t->transmitted, transmitted_list) + cb(chunk); + + list_for_each_entry(chunk, &q->retransmit, list) + cb(chunk); + + list_for_each_entry(chunk, &q->sacked, list) + cb(chunk); + + list_for_each_entry(chunk, &q->abandoned, list) + cb(chunk); + + list_for_each_entry(chunk, &q->out_chunk_list, list) + cb(chunk); +} + /* Verify that this is a valid address. */ static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr, int len) @@ -8196,7 +8226,9 @@ static void sctp_sock_migrate(struct soc * paths won't try to lock it and then oldsk. */ lock_sock_nested(newsk, SINGLE_DEPTH_NESTING); + sctp_for_each_tx_datachunk(assoc, sctp_clear_owner_w); sctp_assoc_migrate(assoc, newsk); + sctp_for_each_tx_datachunk(assoc, sctp_set_owner_w); /* If the association on the newsk is already closed before accept() * is called, set RCV_SHUTDOWN flag. Patches currently in stable-queue which might be from lucien.xin(a)gmail.com are queue-4.13/sctp-reset-owner-sk-for-data-chunks-on-out-queues-when-migrating-a-sock.patch queue-4.13/ipip-only-increase-err_count-for-some-certain-type-icmp-in-ipip_err.patch queue-4.13/sctp-full-support-for-ipv6-ip_nonlocal_bind-ip_freebind.patch queue-4.13/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.13/ip6_gre-only-increase-err_count-for-some-certain-type-icmpv6-in-ip6gre_err.patch queue-4.13/ip6_gre-update-dst-pmtu-if-dev-mtu-has-been-updated-by-toobig-in-__gre6_xmit.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "sctp: full support for ipv6 ip_nonlocal_bind & IP_FREEBIND" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled sctp: full support for ipv6 ip_nonlocal_bind & IP_FREEBIND to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: sctp-full-support-for-ipv6-ip_nonlocal_bind-ip_freebind.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Laszlo Toth <laszlth(a)gmail.com> Date: Mon, 23 Oct 2017 19:19:33 +0200 Subject: sctp: full support for ipv6 ip_nonlocal_bind & IP_FREEBIND From: Laszlo Toth <laszlth(a)gmail.com> [ Upstream commit b71d21c274eff20a9db8158882b545b141b73ab8 ] Commit 9b9742022888 ("sctp: support ipv6 nonlocal bind") introduced support for the above options as v4 sctp did, so patched sctp_v6_available(). In the v4 implementation it's enough, because sctp_inet_bind_verify() just returns with sctp_v4_available(). However sctp_inet6_bind_verify() has an extra check before that for link-local scope_id, which won't respect the above options. Added the checks before calling ipv6_chk_addr(), but not before the validation of scope_id. before (w/ both options): ./v6test fe80::10 sctp bind failed, errno: 99 (Cannot assign requested address) ./v6test fe80::10 tcp bind success, errno: 0 (Success) after (w/ both options): ./v6test fe80::10 sctp bind success, errno: 0 (Success) Signed-off-by: Laszlo Toth <laszlth(a)gmail.com> Reviewed-by: Xin Long <lucien.xin(a)gmail.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/sctp/ipv6.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -882,8 +882,10 @@ static int sctp_inet6_bind_verify(struct net = sock_net(&opt->inet.sk); rcu_read_lock(); dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id); - if (!dev || - !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) { + if (!dev || !(opt->inet.freebind || + net->ipv6.sysctl.ip_nonlocal_bind || + ipv6_chk_addr(net, &addr->v6.sin6_addr, + dev, 0))) { rcu_read_unlock(); return 0; } Patches currently in stable-queue which might be from laszlth(a)gmail.com are queue-4.13/sctp-full-support-for-ipv6-ip_nonlocal_bind-ip_freebind.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "ppp: fix race in ppp device destruction" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled ppp: fix race in ppp device destruction to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: ppp-fix-race-in-ppp-device-destruction.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Guillaume Nault <g.nault(a)alphalink.fr> Date: Fri, 6 Oct 2017 17:05:49 +0200 Subject: ppp: fix race in ppp device destruction From: Guillaume Nault <g.nault(a)alphalink.fr> [ Upstream commit 6151b8b37b119e8e3a8401b080d532520c95faf4 ] ppp_release() tries to ensure that netdevices are unregistered before decrementing the unit refcount and running ppp_destroy_interface(). This is all fine as long as the the device is unregistered by ppp_release(): the unregister_netdevice() call, followed by rtnl_unlock(), guarantee that the unregistration process completes before rtnl_unlock() returns. However, the device may be unregistered by other means (like ppp_nl_dellink()). If this happens right before ppp_release() calling rtnl_lock(), then ppp_release() has to wait for the concurrent unregistration code to release the lock. But rtnl_unlock() releases the lock before completing the device unregistration process. This allows ppp_release() to proceed and eventually call ppp_destroy_interface() before the unregistration process completes. Calling free_netdev() on this partially unregistered device will BUG(): ------------[ cut here ]------------ kernel BUG at net/core/dev.c:8141! invalid opcode: 0000 [#1] SMP CPU: 1 PID: 1557 Comm: pppd Not tainted 4.14.0-rc2+ #4 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1.fc26 04/01/2014 Call Trace: ppp_destroy_interface+0xd8/0xe0 [ppp_generic] ppp_disconnect_channel+0xda/0x110 [ppp_generic] ppp_unregister_channel+0x5e/0x110 [ppp_generic] pppox_unbind_sock+0x23/0x30 [pppox] pppoe_connect+0x130/0x440 [pppoe] SYSC_connect+0x98/0x110 ? do_fcntl+0x2c0/0x5d0 SyS_connect+0xe/0x10 entry_SYSCALL_64_fastpath+0x1a/0xa5 RIP: free_netdev+0x107/0x110 RSP: ffffc28a40573d88 ---[ end trace ed294ff0cc40eeff ]--- We could set the ->needs_free_netdev flag on PPP devices and move the ppp_destroy_interface() logic in the ->priv_destructor() callback. But that'd be quite intrusive as we'd first need to unlink from the other channels and units that depend on the device (the ones that used the PPPIOCCONNECT and PPPIOCATTACH ioctls). Instead, we can just let the netdevice hold a reference on its ppp_file. This reference is dropped in ->priv_destructor(), at the very end of the unregistration process, so that neither ppp_release() nor ppp_disconnect_channel() can call ppp_destroy_interface() in the interim. Reported-by: Beniamino Galvani <bgalvani(a)redhat.com> Fixes: 8cb775bc0a34 ("ppp: fix device unregistration upon netns deletion") Signed-off-by: Guillaume Nault <g.nault(a)alphalink.fr> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- drivers/net/ppp/ppp_generic.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) --- a/drivers/net/ppp/ppp_generic.c +++ b/drivers/net/ppp/ppp_generic.c @@ -1339,7 +1339,17 @@ ppp_get_stats64(struct net_device *dev, static int ppp_dev_init(struct net_device *dev) { + struct ppp *ppp; + netdev_lockdep_set_classes(dev); + + ppp = netdev_priv(dev); + /* Let the netdevice take a reference on the ppp file. This ensures + * that ppp_destroy_interface() won't run before the device gets + * unregistered. + */ + atomic_inc(&ppp->file.refcnt); + return 0; } @@ -1362,6 +1372,15 @@ static void ppp_dev_uninit(struct net_de wake_up_interruptible(&ppp->file.rwait); } +static void ppp_dev_priv_destructor(struct net_device *dev) +{ + struct ppp *ppp; + + ppp = netdev_priv(dev); + if (atomic_dec_and_test(&ppp->file.refcnt)) + ppp_destroy_interface(ppp); +} + static const struct net_device_ops ppp_netdev_ops = { .ndo_init = ppp_dev_init, .ndo_uninit = ppp_dev_uninit, @@ -1387,6 +1406,7 @@ static void ppp_setup(struct net_device dev->tx_queue_len = 3; dev->type = ARPHRD_PPP; dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; + dev->priv_destructor = ppp_dev_priv_destructor; netif_keep_dst(dev); } Patches currently in stable-queue which might be from g.nault(a)alphalink.fr are queue-4.13/ppp-fix-race-in-ppp-device-destruction.patch queue-4.13/l2tp-hold-tunnel-in-pppol2tp_connect.patch queue-4.13/l2tp-check-ps-sock-before-running-pppol2tp_session_ioctl.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Xin Long <lucien.xin(a)gmail.com> Date: Wed, 18 Oct 2017 21:37:49 +0800 Subject: sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect From: Xin Long <lucien.xin(a)gmail.com> [ Upstream commit 1cc276cec9ec574d41cf47dfc0f51406b6f26ab4 ] Now sctp processes icmp redirect packet in sctp_icmp_redirect where it calls sctp_transport_dst_check in which tp->dst can be released. The problem is before calling sctp_transport_dst_check, it doesn't check sock_owned_by_user, which means tp->dst could be freed while a process is accessing it with owning the socket. An use-after-free issue could be triggered by this. This patch is to fix it by checking sock_owned_by_user before calling sctp_transport_dst_check in sctp_icmp_redirect, so that it would not release tp->dst if users still hold sock lock. Besides, the same issue fixed in commit 45caeaa5ac0b ("dccp/tcp: fix routing redirect race") on sctp also needs this check. Fixes: 55be7a9c6074 ("ipv4: Add redirect support to all protocol icmp error handlers") Reported-by: Eric Dumazet <edumazet(a)google.com> Signed-off-by: Xin Long <lucien.xin(a)gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner(a)gmail.com> Acked-by: Neil Horman <nhorman(a)tuxdriver.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/sctp/input.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/sctp/input.c +++ b/net/sctp/input.c @@ -421,7 +421,7 @@ void sctp_icmp_redirect(struct sock *sk, { struct dst_entry *dst; - if (!t) + if (sock_owned_by_user(sk) || !t) return; dst = sctp_transport_dst_check(t); if (dst) Patches currently in stable-queue which might be from lucien.xin(a)gmail.com are queue-4.13/sctp-reset-owner-sk-for-data-chunks-on-out-queues-when-migrating-a-sock.patch queue-4.13/ipip-only-increase-err_count-for-some-certain-type-icmp-in-ipip_err.patch queue-4.13/sctp-full-support-for-ipv6-ip_nonlocal_bind-ip_freebind.patch queue-4.13/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.13/ip6_gre-only-increase-err_count-for-some-certain-type-icmpv6-in-ip6gre_err.patch queue-4.13/ip6_gre-update-dst-pmtu-if-dev-mtu-has-been-updated-by-toobig-in-__gre6_xmit.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "netlink: fix netlink_ack() extack race" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled netlink: fix netlink_ack() extack race to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: netlink-fix-netlink_ack-extack-race.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Johannes Berg <johannes.berg(a)intel.com> Date: Mon, 16 Oct 2017 17:09:53 +0200 Subject: netlink: fix netlink_ack() extack race From: Johannes Berg <johannes.berg(a)intel.com> [ Upstream commit 48044eb490be71c203e14dd89e8bae87209eab52 ] It seems that it's possible to toggle NETLINK_F_EXT_ACK through setsockopt() while another thread/CPU is building a message inside netlink_ack(), which could then trigger the WARN_ON()s I added since if it goes from being turned off to being turned on between allocating and filling the message, the skb could end up being too small. Avoid this whole situation by storing the value of this flag in a separate variable and using that throughout the function instead. Fixes: 2d4bc93368f5 ("netlink: extended ACK reporting") Signed-off-by: Johannes Berg <johannes.berg(a)intel.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/netlink/af_netlink.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -2299,6 +2299,7 @@ void netlink_ack(struct sk_buff *in_skb, size_t tlvlen = 0; struct netlink_sock *nlk = nlk_sk(NETLINK_CB(in_skb).sk); unsigned int flags = 0; + bool nlk_has_extack = nlk->flags & NETLINK_F_EXT_ACK; /* Error messages get the original request appened, unless the user * requests to cap the error message, and get extra error data if @@ -2309,7 +2310,7 @@ void netlink_ack(struct sk_buff *in_skb, payload += nlmsg_len(nlh); else flags |= NLM_F_CAPPED; - if (nlk->flags & NETLINK_F_EXT_ACK && extack) { + if (nlk_has_extack && extack) { if (extack->_msg) tlvlen += nla_total_size(strlen(extack->_msg) + 1); if (extack->bad_attr) @@ -2318,8 +2319,7 @@ void netlink_ack(struct sk_buff *in_skb, } else { flags |= NLM_F_CAPPED; - if (nlk->flags & NETLINK_F_EXT_ACK && - extack && extack->cookie_len) + if (nlk_has_extack && extack && extack->cookie_len) tlvlen += nla_total_size(extack->cookie_len); } @@ -2347,7 +2347,7 @@ void netlink_ack(struct sk_buff *in_skb, errmsg->error = err; memcpy(&errmsg->msg, nlh, payload > sizeof(*errmsg) ? nlh->nlmsg_len : sizeof(*nlh)); - if (nlk->flags & NETLINK_F_EXT_ACK && extack) { + if (nlk_has_extack && extack) { if (err) { if (extack->_msg) WARN_ON(nla_put_string(skb, NLMSGERR_ATTR_MSG, Patches currently in stable-queue which might be from johannes.berg(a)intel.com are queue-4.13/netlink-fix-netlink_ack-extack-race.patch

7 years, 7 months

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[Linux-stable-mirror] Patch "packet: avoid panic in packet_getsockopt()" has been added to the 4.13-stable tree

by gregkh＠linuxfoundation.org

This is a note to let you know that I've just added the patch titled packet: avoid panic in packet_getsockopt() to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=sum… The filename of the patch is: packet-avoid-panic-in-packet_getsockopt.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable(a)vger.kernel.org> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Eric Dumazet <edumazet(a)google.com> Date: Wed, 18 Oct 2017 16:14:52 -0700 Subject: packet: avoid panic in packet_getsockopt() From: Eric Dumazet <edumazet(a)google.com> [ Upstream commit 509c7a1ecc8601f94ffba8a00889fefb239c00c6 ] syzkaller got crashes in packet_getsockopt() processing PACKET_ROLLOVER_STATS command while another thread was managing to change po->rollover Using RCU will fix this bug. We might later add proper RCU annotations for sparse sake. In v2: I replaced kfree(rollover) in fanout_add() to kfree_rcu() variant, as spotted by John. Fixes: a9b6391814d5 ("packet: rollover statistics") Signed-off-by: Eric Dumazet <edumazet(a)google.com> Cc: Willem de Bruijn <willemb(a)google.com> Cc: John Sperbeck <jsperbeck(a)google.com> Signed-off-by: David S. Miller <davem(a)davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> --- net/packet/af_packet.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -1771,7 +1771,7 @@ static int fanout_add(struct sock *sk, u out: if (err && rollover) { - kfree(rollover); + kfree_rcu(rollover, rcu); po->rollover = NULL; } mutex_unlock(&fanout_mutex); @@ -1798,8 +1798,10 @@ static struct packet_fanout *fanout_rele else f = NULL; - if (po->rollover) + if (po->rollover) { kfree_rcu(po->rollover, rcu); + po->rollover = NULL; + } } mutex_unlock(&fanout_mutex); @@ -3853,6 +3855,7 @@ static int packet_getsockopt(struct sock void *data = &val; union tpacket_stats_u st; struct tpacket_rollover_stats rstats; + struct packet_rollover *rollover; if (level != SOL_PACKET) return -ENOPROTOOPT; @@ -3931,13 +3934,18 @@ static int packet_getsockopt(struct sock 0); break; case PACKET_ROLLOVER_STATS: - if (!po->rollover) + rcu_read_lock(); + rollover = rcu_dereference(po->rollover); + if (rollover) { + rstats.tp_all = atomic_long_read(&rollover->num); + rstats.tp_huge = atomic_long_read(&rollover->num_huge); + rstats.tp_failed = atomic_long_read(&rollover->num_failed); + data = &rstats; + lv = sizeof(rstats); + } + rcu_read_unlock(); + if (!rollover) return -EINVAL; - rstats.tp_all = atomic_long_read(&po->rollover->num); - rstats.tp_huge = atomic_long_read(&po->rollover->num_huge); - rstats.tp_failed = atomic_long_read(&po->rollover->num_failed); - data = &rstats; - lv = sizeof(rstats); break; case PACKET_TX_HAS_OFF: val = po->tp_tx_has_off; Patches currently in stable-queue which might be from edumazet(a)google.com are queue-4.13/tcp-refresh-tp-timestamp-before-tcp_mtu_probe.patch queue-4.13/net-call-cgroup_sk_alloc-earlier-in-sk_clone_lock.patch queue-4.13/tcp-dccp-fix-ireq-opt-races.patch queue-4.13/tcp-fix-tcp_mtu_probe-vs-highest_sack.patch queue-4.13/ipv6-addrconf-increment-ifp-refcount-before-ipv6_del_addr.patch queue-4.13/ipv6-flowlabel-do-not-leave-opt-tot_len-with-garbage.patch queue-4.13/packet-avoid-panic-in-packet_getsockopt.patch queue-4.13/sctp-add-the-missing-sock_owned_by_user-check-in-sctp_icmp_redirect.patch queue-4.13/net_sched-avoid-matching-qdisc-with-zero-handle.patch queue-4.13/tun-tap-sanitize-tunsetsndbuf-input.patch queue-4.13/tcp-dccp-fix-lockdep-splat-in-inet_csk_route_req.patch queue-4.13/tcp-dccp-fix-other-lockdep-splats-accessing-ireq_opt.patch

7 years, 7 months

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