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general protection fault in skb_segment (4)

Status: fixed on 2024/01/22 01:16
Subsystems: net
[Documentation on labels]
Fix commit: 23d05d563b7e net: prevent mss overflow in skb_segment()
First crash: 165d, last: 158d
Cause bisection: failed (error log, bisect log)
  
Similar bugs (8)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 general protection fault in skb_segment C done 1 150d 164d 0/2 auto-obsoleted due to no activity on 2024/04/02 16:56
android-5-15 general protection fault in skb_segment origin:upstream C done 1 150d 164d 0/2 auto-obsoleted due to no activity on 2024/04/03 02:38
linux-4.14 general protection fault in skb_segment 1 687d 687d 0/1 auto-obsoleted due to no activity on 2022/11/02 17:51
upstream general protection fault in skb_segment (3) net C done 2 283d 283d 23/26 fixed on 2023/10/12 12:48
upstream general protection fault in skb_segment sctp C 7 2327d 2336d 4/26 fixed on 2018/01/29 03:39
android-6-1 general protection fault in skb_segment origin:upstream missing-backport C done done 1 72d 162d 0/2 upstream: reported C repro on 2023/12/13 03:03
upstream general protection fault in skb_segment (2) net 1 1192d 1192d 0/26 auto-closed as invalid on 2021/05/17 11:26
android-54 general protection fault in skb_segment C 1 80d 164d 0/2 upstream: reported C repro on 2023/12/10 13:55
Last patch testing requests (2)
Created Duration User Patch Repo Result
2023/12/11 18:44 24m edumazet@google.com patch net OK log
2023/12/11 17:49 22m edumazet@google.com patch net OK log

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077]
CPU: 0 PID: 5082 Comm: syz-executor149 Not tainted 6.7.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:skb_segment+0x181d/0x3f30 net/core/skbuff.c:4551
Code: 83 e3 02 e9 fb ed ff ff e8 f0 5b 1c f9 48 8b 84 24 f8 00 00 00 48 8d 78 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8a 21 00 00 48 8b 84 24 f8 00
RSP: 0018:ffffc9000410f3d0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000010046 RCX: ffffffff886b2287
RDX: 000000000000000e RSI: ffffffff886b3210 RDI: 0000000000000070
RBP: ffffc9000410f578 R08: 0000000000000005 R09: 000000000000ffff
R10: 000000000000ffff R11: 0000000000000002 R12: ffff88807ef52ac0
R13: 0000000000010000 R14: 000000000000ffff R15: 0000000000000046
FS:  0000555555beb380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020010000 CR3: 000000001c19a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 udp6_ufo_fragment+0xa0e/0xd00 net/ipv6/udp_offload.c:109
 ipv6_gso_segment+0x534/0x17e0 net/ipv6/ip6_offload.c:120
 skb_mac_gso_segment+0x290/0x610 net/core/gso.c:53
 __skb_gso_segment+0x339/0x710 net/core/gso.c:124
 skb_gso_segment include/net/gso.h:83 [inline]
 validate_xmit_skb+0x36c/0xeb0 net/core/dev.c:3626
 __dev_queue_xmit+0x6f3/0x3d60 net/core/dev.c:4338
 dev_queue_xmit include/linux/netdevice.h:3134 [inline]
 packet_xmit+0x257/0x380 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3087 [inline]
 packet_sendmsg+0x24c6/0x5220 net/packet/af_packet.c:3119
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 __sys_sendto+0x255/0x340 net/socket.c:2190
 __do_sys_sendto net/socket.c:2202 [inline]
 __se_sys_sendto net/socket.c:2198 [inline]
 __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2198
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f3767b6aaa9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd7ae09e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f3767b6aaa9
RDX: 0000000000010048 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00000000000f4240 R08: 0000000020000540 R09: 0000000000000014
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd7ae09ed0
R13: 0000000000000001 R14: 00007ffd7ae09ed0 R15: 0000000000000003
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_segment+0x181d/0x3f30 net/core/skbuff.c:4551
Code: 83 e3 02 e9 fb ed ff ff e8 f0 5b 1c f9 48 8b 84 24 f8 00 00 00 48 8d 78 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8a 21 00 00 48 8b 84 24 f8 00
RSP: 0018:ffffc9000410f3d0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000010046 RCX: ffffffff886b2287
RDX: 000000000000000e RSI: ffffffff886b3210 RDI: 0000000000000070
RBP: ffffc9000410f578 R08: 0000000000000005 R09: 000000000000ffff
R10: 000000000000ffff R11: 0000000000000002 R12: ffff88807ef52ac0
R13: 0000000000010000 R14: 000000000000ffff R15: 0000000000000046
FS:  0000555555beb380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020010000 CR3: 000000001c19a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	83 e3 02             	and    $0x2,%ebx
   3:	e9 fb ed ff ff       	jmp    0xffffee03
   8:	e8 f0 5b 1c f9       	call   0xf91c5bfd
   d:	48 8b 84 24 f8 00 00 	mov    0xf8(%rsp),%rax
  14:	00
  15:	48 8d 78 70          	lea    0x70(%rax),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 03                	cmp    $0x3,%al
  34:	0f 8e 8a 21 00 00    	jle    0x21c4
  3a:	48                   	rex.W
  3b:	8b                   	.byte 0x8b
  3c:	84 24 f8             	test   %ah,(%rax,%rdi,8)

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/12/11 15:51 upstream a39b6ac3781d 28b24332 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce general protection fault in skb_segment
2023/12/09 21:56 net 1ae4cd3cbdd0 28b24332 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce general protection fault in skb_segment
2023/12/11 07:16 net-next 5a08d0065a91 28b24332 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in skb_segment
2023/12/17 05:44 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci d5b235ec8eab 3222d10c .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel paging request in skb_segment
* Struck through repros no longer work on HEAD.