linux-kernel - BUG: null pointer dereference in

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Message-ID: <CANikGpeQuBKj89rTkaAs5ADrz0+YLQ54g-0CshYzE3h06G0U5g@mail.gmail.com>
Date: Tue, 27 Aug 2024 21:09:49 -0700
From: Juefei Pu <juefei.pu@...il.ucr.edu>
To: kees@...nel.org, luto@...capital.net, wad@...omium.org, 
	linux-kernel@...r.kernel.org
Subject: BUG: null pointer dereference in

Hello,
We found the following null-pointer-dereference issue using syzkaller
on Linux v6.10.
Unfortunately, the syzkaller failed to generate a reproducer.
But at least we have the report:

Oops: general protection fault, probably for non-canonical address
0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 PID: 4493 Comm: systemd-journal Not tainted 6.10.0 #13
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:__bpf_prog_run include/linux/filter.h:691 [inline]
RIP: 0010:bpf_prog_run include/linux/filter.h:698 [inline]
RIP: 0010:bpf_prog_run_pin_on_cpu include/linux/filter.h:715 [inline]
RIP: 0010:seccomp_run_filters+0x17a/0x3f0 kernel/seccomp.c:426
Code: 00 00 e8 99 36 d2 ff 0f 1f 44 00 00 e8 cf 58 ff ff 48 8d 5d 48
48 83 c5 30 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c
08 00 74 08 48 89 ef e8 c8 63 62 00 4c 8b 5d 00 48 8b 3c 24
RSP: 0018:ffffc90002cb7be0 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000048 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 00000000000002a4 RDI: ffffffff8b517360
RBP: 0000000000000030 R08: ffffffff8191f8eb R09: 1ffff11004039e86
R10: dffffc0000000000 R11: ffffffffa00016d0 R12: 000000007fff0000
R13: ffff88801f84a800 R14: ffffc90002cb7df0 R15: 000000007fff0000
FS:  00007f897e849900(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f897d771b08 CR3: 00000000195fe000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __seccomp_filter+0x46f/0x1c70 kernel/seccomp.c:1222
 syscall_trace_enter+0xa4/0x140 kernel/entry/common.c:52
 syscall_enter_from_user_mode_work include/linux/entry-common.h:168 [inline]
 syscall_enter_from_user_mode include/linux/entry-common.h:198 [inline]
 do_syscall_64+0x5d/0x150 arch/x86/entry/common.c:79
 entry_SYSCALL_64_after_hwframe+0x67/0x6f
RIP: 0033:0x7f897ed171e4
Code: 84 00 00 00 00 00 44 89 54 24 0c e8 36 58 f9 ff 44 8b 54 24 0c
44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d
00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 68 58 f9 ff 8b 44
RSP: 002b:00007ffd4ae74a60 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00005627cd785ed0 RCX: 00007f897ed171e4
RDX: 0000000000290000 RSI: 00007f897f010d0a RDI: 00000000ffffff9c
RBP: 00007f897f010d0a R08: 0000000000000000 R09: 0034353132303865
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000290000
R13: 00007ffd4ae74d20 R14: 0000000000000000 R15: 00007ffd4ae74e28
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__bpf_prog_run include/linux/filter.h:691 [inline]
RIP: 0010:bpf_prog_run include/linux/filter.h:698 [inline]
RIP: 0010:bpf_prog_run_pin_on_cpu include/linux/filter.h:715 [inline]
RIP: 0010:seccomp_run_filters+0x17a/0x3f0 kernel/seccomp.c:426
Code: 00 00 e8 99 36 d2 ff 0f 1f 44 00 00 e8 cf 58 ff ff 48 8d 5d 48
48 83 c5 30 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c
08 00 74 08 48 89 ef e8 c8 63 62 00 4c 8b 5d 00 48 8b 3c 24
RSP: 0018:ffffc90002cb7be0 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000048 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 00000000000002a4 RDI: ffffffff8b517360
RBP: 0000000000000030 R08: ffffffff8191f8eb R09: 1ffff11004039e86
R10: dffffc0000000000 R11: ffffffffa00016d0 R12: 000000007fff0000
R13: ffff88801f84a800 R14: ffffc90002cb7df0 R15: 000000007fff0000
FS:  00007f897e849900(0000) GS:ffff888063a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f521f8ca000 CR3: 00000000195fe000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0: 00 00                 add    %al,(%rax)
   2: e8 99 36 d2 ff       call   0xffd236a0
   7: 0f 1f 44 00 00       nopl   0x0(%rax,%rax,1)
   c: e8 cf 58 ff ff       call   0xffff58e0
  11: 48 8d 5d 48           lea    0x48(%rbp),%rbx
  15: 48 83 c5 30           add    $0x30,%rbp
  19: 48 89 e8             mov    %rbp,%rax
  1c: 48 c1 e8 03           shr    $0x3,%rax
  20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
  27: fc ff df
* 2a: 80 3c 08 00           cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e: 74 08                 je     0x38
  30: 48 89 ef             mov    %rbp,%rdi
  33: e8 c8 63 62 00       call   0x626400
  38: 4c 8b 5d 00           mov    0x0(%rbp),%r11
  3c: 48 8b 3c 24           mov    (%rsp),%rdi