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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

6 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

6 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

6 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

6 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

6 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

6 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

6 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

6 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

6 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

6 years, 7 months

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