syzbot ci has tested the following series
[v2] bpf: Fix FIONREAD and copied_seq issues https://lore.kernel.org/all/20251121030013.60133-1-jiayuan.chen@linux.dev * [PATCH bpf-next v2 1/3] bpf, sockmap: Fix incorrect copied_seq calculation * [PATCH bpf-next v2 2/3] bpf, sockmap: Fix FIONREAD for sockmap * [PATCH bpf-next v2 3/3] bpf, selftest: Add tests for FIONREAD and copied_seq
and found the following issues: * KASAN: slab-out-of-bounds Read in tcp_ioctl * KASAN: slab-use-after-free Read in tcp_ioctl * SYZFAIL: failed to recv rpc * WARNING in sk_psock_destroy
Full report is available here: https://ci.syzbot.org/series/2dc8b7c6-6074-4e9e-a56e-dc5f34e678db
***
KASAN: slab-out-of-bounds Read in tcp_ioctl
tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 4722981cca373a338bbcf3a93ecf7144a892b03b arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/ffa9b2b0-ceb4-4d19-bc45-58475d561b3b/config syz repro: https://ci.syzbot.org/findings/5fbc614a-9eb9-426b-96c5-1f69b6874e56/syz_repr...
================================================================== BUG: KASAN: slab-out-of-bounds in tcp_ioctl+0x673/0x860 net/ipv4/tcp.c:659 Read of size 2 at addr ffff8881114d5df6 by task syz.2.19/6006
CPU: 0 UID: 0 PID: 6006 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 tcp_ioctl+0x673/0x860 net/ipv4/tcp.c:659 sock_ioctl_out net/core/sock.c:4392 [inline] sk_ioctl+0x3c7/0x600 net/core/sock.c:4420 inet_ioctl+0x416/0x4c0 net/ipv4/af_inet.c:1007 sock_do_ioctl+0xdc/0x300 net/socket.c:1254 sock_ioctl+0x576/0x790 net/socket.c:1375 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f472558f6c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f472647a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f47257e5fa0 RCX: 00007f472558f6c9 RDX: 0000000000000000 RSI: 0000000000008905 RDI: 0000000000000004 RBP: 00007f4725611f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f47257e6038 R14: 00007f47257e5fa0 R15: 00007ffcbb3f8478 </TASK>
The buggy address belongs to the object at ffff8881114d5d80 which belongs to the cache UDP of size 1984 The buggy address is located 118 bytes inside of allocated 1984-byte region [ffff8881114d5d80, ffff8881114d6540)
The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1114d0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88811112a501 flags: 0x17ff00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 017ff00000000040 ffff888105697000 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800f000f 00000000f5000000 ffff88811112a501 head: 017ff00000000040 ffff888105697000 dead000000000122 0000000000000000 head: 0000000000000000 00000000800f000f 00000000f5000000 ffff88811112a501 head: 017ff00000000003 ffffea0004453401 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5847, tgid 5847 (syz-executor), ts 60144423433, free_ts 60089454561 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:3059 [inline] allocate_slab+0x96/0x350 mm/slub.c:3232 new_slab mm/slub.c:3286 [inline] ___slab_alloc+0xf56/0x1990 mm/slub.c:4655 __slab_alloc+0x65/0x100 mm/slub.c:4778 __slab_alloc_node mm/slub.c:4854 [inline] slab_alloc_node mm/slub.c:5276 [inline] kmem_cache_alloc_noprof+0x3f9/0x6e0 mm/slub.c:5295 sk_prot_alloc+0x57/0x220 net/core/sock.c:2233 sk_alloc+0x3a/0x370 net/core/sock.c:2295 inet_create+0x7a0/0x1000 net/ipv4/af_inet.c:328 __sock_create+0x4b3/0x9f0 net/socket.c:1605 udp_sock_create4+0xbe/0x4b0 net/ipv4/udp_tunnel_core.c:19 udp_sock_create include/net/udp_tunnel.h:59 [inline] wg_socket_init+0x4e5/0xa60 drivers/net/wireguard/socket.c:387 wg_open+0x24f/0x420 drivers/net/wireguard/device.c:51 __dev_open+0x470/0x880 net/core/dev.c:1682 page last free pid 5847 tgid 5847 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906 discard_slab mm/slub.c:3330 [inline] __put_partials+0x146/0x170 mm/slub.c:3876 put_cpu_partial+0x1f2/0x2e0 mm/slub.c:3951 __slab_free+0x2b9/0x390 mm/slub.c:5929 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:352 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4978 [inline] slab_alloc_node mm/slub.c:5288 [inline] __do_kmalloc_node mm/slub.c:5649 [inline] __kmalloc_noprof+0x3c3/0x7f0 mm/slub.c:5662 kmalloc_noprof include/linux/slab.h:961 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] fib_create_info+0x172d/0x3210 net/ipv4/fib_semantics.c:1402 fib_table_insert+0xc6/0x1b50 net/ipv4/fib_trie.c:1212 fib_magic+0x2c4/0x390 net/ipv4/fib_frontend.c:1134 fib_add_ifaddr+0x144/0x5f0 net/ipv4/fib_frontend.c:1156 fib_netdev_event+0x382/0x490 net/ipv4/fib_frontend.c:1516 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline] call_netdevice_notifiers net/core/dev.c:2281 [inline] __dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1 netif_change_flags+0xe8/0x1a0 net/core/dev.c:9705
Memory state around the buggy address: ffff8881114d5c80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff8881114d5d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881114d5d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^ ffff8881114d5e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881114d5e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================
***
KASAN: slab-use-after-free Read in tcp_ioctl
tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 4722981cca373a338bbcf3a93ecf7144a892b03b arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/ffa9b2b0-ceb4-4d19-bc45-58475d561b3b/config C repro: https://ci.syzbot.org/findings/956fd3c8-f06a-44eb-b0ff-510a6c8b378d/c_repro syz repro: https://ci.syzbot.org/findings/956fd3c8-f06a-44eb-b0ff-510a6c8b378d/syz_repr...
================================================================== BUG: KASAN: slab-use-after-free in tcp_ioctl+0x673/0x860 net/ipv4/tcp.c:659 Read of size 2 at addr ffff888101fe3bf6 by task syz.0.17/5959
CPU: 1 UID: 0 PID: 5959 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 tcp_ioctl+0x673/0x860 net/ipv4/tcp.c:659 sock_ioctl_out net/core/sock.c:4392 [inline] sk_ioctl+0x3c7/0x600 net/core/sock.c:4420 inet_ioctl+0x416/0x4c0 net/ipv4/af_inet.c:1007 sock_do_ioctl+0xdc/0x300 net/socket.c:1254 sock_ioctl+0x576/0x790 net/socket.c:1375 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4a1458f6c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4a1545b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4a147e5fa0 RCX: 00007f4a1458f6c9 RDX: 0000000000000000 RSI: 0000000000008905 RDI: 0000000000000004 RBP: 00007f4a14611f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4a147e6038 R14: 00007f4a147e5fa0 R15: 00007ffef33173a8 </TASK>
Allocated by task 5926: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4978 [inline] slab_alloc_node mm/slub.c:5288 [inline] kmem_cache_alloc_noprof+0x367/0x6e0 mm/slub.c:5295 sk_prot_alloc+0x57/0x220 net/core/sock.c:2233 sk_alloc+0x3a/0x370 net/core/sock.c:2295 inet_create+0x7a0/0x1000 net/ipv4/af_inet.c:328 __sock_create+0x4b3/0x9f0 net/socket.c:1605 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xd7/0x1b0 net/socket.c:1747 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1759 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 5926: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2543 [inline] slab_free mm/slub.c:6642 [inline] kmem_cache_free+0x19b/0x690 mm/slub.c:6752 sk_prot_free net/core/sock.c:2276 [inline] __sk_destruct+0x4d2/0x660 net/core/sock.c:2373 inet_release+0x144/0x190 net/ipv4/af_inet.c:437 __sock_release net/socket.c:662 [inline] sock_close+0xc3/0x240 net/socket.c:1455 __fput+0x44c/0xa70 fs/file_table.c:468 fput_close_sync+0x119/0x200 fs/file_table.c:573 __do_sys_close fs/open.c:1589 [inline] __se_sys_close fs/open.c:1574 [inline] __x64_sys_close+0x7f/0x110 fs/open.c:1574 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888101fe3b80 which belongs to the cache UDP of size 1984 The buggy address is located 118 bytes inside of freed 1984-byte region [ffff888101fe3b80, ffff888101fe4340)
The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101fe0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff8881086b4301 anon flags: 0x17ff00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 017ff00000000040 ffff888160ef5b40 0000000000000000 0000000000000001 raw: 0000000000000000 00000000800f000f 00000000f5000000 ffff8881086b4301 head: 017ff00000000040 ffff888160ef5b40 0000000000000000 0000000000000001 head: 0000000000000000 00000000800f000f 00000000f5000000 ffff8881086b4301 head: 017ff00000000003 ffffea000407f801 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 3581320107, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:3059 [inline] allocate_slab+0x96/0x350 mm/slub.c:3232 new_slab mm/slub.c:3286 [inline] ___slab_alloc+0xf56/0x1990 mm/slub.c:4655 __slab_alloc+0x65/0x100 mm/slub.c:4778 __slab_alloc_node mm/slub.c:4854 [inline] slab_alloc_node mm/slub.c:5276 [inline] kmem_cache_alloc_noprof+0x3f9/0x6e0 mm/slub.c:5295 sk_prot_alloc+0x57/0x220 net/core/sock.c:2233 sk_alloc+0x3a/0x370 net/core/sock.c:2295 inet_create+0x7a0/0x1000 net/ipv4/af_inet.c:328 __sock_create+0x4b3/0x9f0 net/socket.c:1605 inet_ctl_sock_create+0x9a/0x220 net/ipv4/af_inet.c:1632 igmp_net_init+0xb9/0x150 net/ipv4/igmp.c:3125 ops_init+0x35c/0x5c0 net/core/net_namespace.c:137 __register_pernet_operations net/core/net_namespace.c:1314 [inline] register_pernet_operations+0x336/0x800 net/core/net_namespace.c:1391 page_owner free stack trace missing
Memory state around the buggy address: ffff888101fe3a80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff888101fe3b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888101fe3b80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^ ffff888101fe3c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888101fe3c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
***
SYZFAIL: failed to recv rpc
tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 4722981cca373a338bbcf3a93ecf7144a892b03b arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/ffa9b2b0-ceb4-4d19-bc45-58475d561b3b/config C repro: https://ci.syzbot.org/findings/f3ffc26d-6509-4e92-92bd-bfa118ae72e6/c_repro syz repro: https://ci.syzbot.org/findings/f3ffc26d-6509-4e92-92bd-bfa118ae72e6/syz_repr...
SYZFAIL: failed to recv rpc fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)
***
WARNING in sk_psock_destroy
tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 4722981cca373a338bbcf3a93ecf7144a892b03b arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/ffa9b2b0-ceb4-4d19-bc45-58475d561b3b/config C repro: https://ci.syzbot.org/findings/a13957c4-d51a-4472-ab31-37d57484d32e/c_repro syz repro: https://ci.syzbot.org/findings/a13957c4-d51a-4472-ab31-37d57484d32e/syz_repr...
------------[ cut here ]------------ WARNING: CPU: 0 PID: 5871 at net/core/skmsg.c:828 __sk_psock_purge_ingress_msg net/core/skmsg.c:828 [inline] WARNING: CPU: 0 PID: 5871 at net/core/skmsg.c:828 __sk_psock_zap_ingress net/core/skmsg.c:839 [inline] WARNING: CPU: 0 PID: 5871 at net/core/skmsg.c:828 sk_psock_destroy+0xa24/0xaa0 net/core/skmsg.c:871 Modules linked in: CPU: 0 UID: 0 PID: 5871 Comm: kworker/0:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: events sk_psock_destroy RIP: 0010:__sk_psock_purge_ingress_msg net/core/skmsg.c:828 [inline] RIP: 0010:__sk_psock_zap_ingress net/core/skmsg.c:839 [inline] RIP: 0010:sk_psock_destroy+0xa24/0xaa0 net/core/skmsg.c:871 Code: e8 51 78 7c f8 85 ed 7e 29 e8 08 74 7c f8 48 89 df 48 83 c4 38 5b 41 5c 41 5d 41 5e 41 5f 5d e9 32 e7 d6 f8 e8 ed 73 7c f8 90 <0f> 0b 90 e9 3f fb ff ff e8 df 73 7c f8 4c 89 f7 be 03 00 00 00 e8 RSP: 0018:ffffc900044679f0 EFLAGS: 00010293 RAX: ffffffff894392d3 RBX: dffffc0000000000 RCX: ffff88810f218000 RDX: 0000000000000000 RSI: 0000000000022fe0 RDI: 0000000000000000 RBP: ffff88810ba8b000 R08: ffffffff8f7cee77 R09: 1ffffffff1ef9dce R10: dffffc0000000000 R11: fffffbfff1ef9dcf R12: ffff88810ba890c0 R13: dead000000000100 R14: 0000000000022fe0 R15: ffff88810ba890c0 FS: 0000000000000000(0000) GS:ffff88818eb38000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0002a58f8 CR3: 000000000dd38000 CR4: 00000000000006f0 Call Trace: <TASK> process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK>
***
If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com
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