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KASAN: null-ptr-deref Write in vfs_rmdir

Status: upstream: reported C repro on 2024/04/11 05:14
Reported-by: syzbot+1f38b4bccc03c336b205@syzkaller.appspotmail.com
First crash: 24d, last: 3h41m
▶ ▼ Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 KASAN: null-ptr-deref Write in vfs_rmdir origin:downstream C 5 13d 23d 0/2 upstream: reported C repro on 2024/04/11 17:58
android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir origin:downstream C 39 9h51m 24d 0/2 upstream: reported C repro on 2024/04/11 09:39
android-54 KASAN: null-ptr-deref Write in vfs_rmdir C 26 3d13h 24d 0/2 upstream: reported C repro on 2024/04/11 05:33

Sample crash report:
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 00007f096f4b3350 R08: ffffffffffffffb8 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000246 R12: 00007f096f4b3350
R13: 0000000000000000 R14: 00007f096f4b3da0 R15: 00007f096f4088f0
---[ end trace 84092e9bf4af7d85 ]---
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc_return include/asm-generic/atomic-instrumented.h:250 [inline]
BUG: KASAN: null-ptr-deref in ihold+0x20/0x60 fs/inode.c:423
Write of size 4 at addr 0000000000000170 by task syz-executor346/287

CPU: 1 PID: 287 Comm: syz-executor346 Tainted: G        W         5.10.209-syzkaller-00002-g4e1bc8d8e8ae #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 __kasan_report mm/kasan/report.c:439 [inline]
 kasan_report+0x167/0x1c0 mm/kasan/report.c:452
 kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189
 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 atomic_inc_return include/asm-generic/atomic-instrumented.h:250 [inline]
 ihold+0x20/0x60 fs/inode.c:423
 d_delete_notify include/linux/fsnotify.h:258 [inline]
 vfs_rmdir+0x200/0x3f0 fs/namei.c:3871
 incfs_kill_sb+0x108/0x220 fs/incfs/vfs.c:1945
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 task_work_run+0x129/0x190 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xc83/0x2a50 kernel/exit.c:861
 do_group_exit+0x141/0x310 kernel/exit.c:983
 __do_sys_exit_group kernel/exit.c:994 [inline]
 __se_sys_exit_group kernel/exit.c:992 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:992
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f096f437909
Code: Unable to access opcode bytes at RIP 0x7f096f4378df.
RSP: 002b:00007fff940343c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f096f437909
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 00007f096f4b3350 R08: ffffffffffffffb8 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000246 R12: 00007f096f4b3350
R13: 0000000000000000 R14: 00007f096f4b3da0 R15: 00007f096f4088f0
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000170
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 287 Comm: syz-executor346 Tainted: G    B   W         5.10.209-syzkaller-00002-g4e1bc8d8e8ae #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:arch_atomic_inc_return include/linux/atomic-arch-fallback.h:286 [inline]
RIP: 0010:atomic_inc_return include/asm-generic/atomic-instrumented.h:251 [inline]
RIP: 0010:ihold+0x25/0x60 fs/inode.c:423
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 b1 56 b3 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 00 d4 f0 ff bb 01 00 00 00 <f0> 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 34 5a b3
RSP: 0018:ffffc90000b07b48 EFLAGS: 00010246
RAX: ffff88811d163b00 RBX: 0000000000000001 RCX: ffff88811d163b40
RDX: 0000000000000000 RSI: 0000000000000286 RDI: 00000000ffffffff
RBP: ffffc90000b07b58 R08: ffffffff813e2edb R09: 0000000000000003
R10: fffffbfff0e10248 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88811c52a770 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000010bab6000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 d_delete_notify include/linux/fsnotify.h:258 [inline]
 vfs_rmdir+0x200/0x3f0 fs/namei.c:3871
 incfs_kill_sb+0x108/0x220 fs/incfs/vfs.c:1945
 deactivate_locked_super+0xad/0x110 fs/super.c:335
 deactivate_super+0xbe/0xf0 fs/super.c:366
 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125
 task_work_run+0x129/0x190 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xc83/0x2a50 kernel/exit.c:861
 do_group_exit+0x141/0x310 kernel/exit.c:983
 __do_sys_exit_group kernel/exit.c:994 [inline]
 __se_sys_exit_group kernel/exit.c:992 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:992
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f096f437909
Code: Unable to access opcode bytes at RIP 0x7f096f4378df.
RSP: 002b:00007fff940343c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f096f437909
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 00007f096f4b3350 R08: ffffffffffffffb8 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000246 R12: 00007f096f4b3350
R13: 0000000000000000 R14: 00007f096f4b3da0 R15: 00007f096f4088f0
Modules linked in:
CR2: 0000000000000170
---[ end trace 84092e9bf4af7d86 ]---
RIP: 0010:arch_atomic_inc_return include/linux/atomic-arch-fallback.h:286 [inline]
RIP: 0010:atomic_inc_return include/asm-generic/atomic-instrumented.h:251 [inline]
RIP: 0010:ihold+0x25/0x60 fs/inode.c:423
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 b1 56 b3 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 00 d4 f0 ff bb 01 00 00 00 <f0> 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 34 5a b3
RSP: 0018:ffffc90000b07b48 EFLAGS: 00010246
RAX: ffff88811d163b00 RBX: 0000000000000001 RCX: ffff88811d163b40
RDX: 0000000000000000 RSI: 0000000000000286 RDI: 00000000ffffffff
RBP: ffffc90000b07b58 R08: ffffffff813e2edb R09: 0000000000000003
R10: fffffbfff0e10248 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88811c52a770 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000010bab6000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	00 55 48             	add    %dl,0x48(%rbp)
   7:	89 e5                	mov    %esp,%ebp
   9:	41 56                	push   %r14
   b:	53                   	push   %rbx
   c:	49 89 fe             	mov    %rdi,%r14
   f:	e8 b1 56 b3 ff       	call   0xffb356c5
  14:	49 8d be 70 01 00 00 	lea    0x170(%r14),%rdi
  1b:	be 04 00 00 00       	mov    $0x4,%esi
  20:	e8 00 d4 f0 ff       	call   0xfff0d425
  25:	bb 01 00 00 00       	mov    $0x1,%ebx
* 2a:	f0 41 0f c1 9e 70 01 	lock xadd %ebx,0x170(%r14) <-- trapping instruction
  31:	00 00
  33:	ff c3                	inc    %ebx
  35:	bf 02 00 00 00       	mov    $0x2,%edi
  3a:	89 de                	mov    %ebx,%esi
  3c:	e8                   	.byte 0xe8
  3d:	34 5a                	xor    $0x5a,%al
  3f:	b3                   	.byte 0xb3

Crashes (105):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/11 19:54 android13-5.10-lts 4e1bc8d8e8ae 95ed9ece .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/11 10:32 android13-5.10-lts 4e1bc8d8e8ae 33b9e058 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/11 05:08 android13-5.10-lts 4e1bc8d8e8ae 33b9e058 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/05 12:11 android13-5.10-lts 70b6ab09a34b 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/05 08:28 android13-5.10-lts 70b6ab09a34b 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/05 04:46 android13-5.10-lts 70b6ab09a34b 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/05 03:10 android13-5.10-lts 70b6ab09a34b 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/05 03:09 android13-5.10-lts 70b6ab09a34b 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/05 01:11 android13-5.10-lts 70b6ab09a34b 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/04 20:08 android13-5.10-lts 70b6ab09a34b 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/03 17:41 android13-5.10-lts 70b6ab09a34b dd26401e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/02 19:54 android13-5.10-lts 70b6ab09a34b 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/02 17:06 android13-5.10-lts 70b6ab09a34b 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/02 03:47 android13-5.10-lts 70b6ab09a34b 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/01 23:43 android13-5.10-lts 70b6ab09a34b 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/30 07:59 android13-5.10-lts 70b6ab09a34b f10afd69 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/30 04:33 android13-5.10-lts 70b6ab09a34b f10afd69 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/29 18:09 android13-5.10-lts 70b6ab09a34b 27e33c58 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/28 19:21 android13-5.10-lts 70b6ab09a34b 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/28 18:09 android13-5.10-lts 70b6ab09a34b 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/26 16:25 android13-5.10-lts 70b6ab09a34b 059e9963 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/26 10:45 android13-5.10-lts 70b6ab09a34b 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/26 09:09 android13-5.10-lts 70b6ab09a34b 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/26 03:54 android13-5.10-lts 70b6ab09a34b 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/26 02:48 android13-5.10-lts 70b6ab09a34b 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/25 15:00 android13-5.10-lts 70b6ab09a34b 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/25 08:17 android13-5.10-lts 70b6ab09a34b 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 14:35 android13-5.10-lts 70b6ab09a34b 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 08:27 android13-5.10-lts 70b6ab09a34b 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 06:11 android13-5.10-lts 70b6ab09a34b 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 04:37 android13-5.10-lts 70b6ab09a34b 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 03:19 android13-5.10-lts 70b6ab09a34b 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 02:13 android13-5.10-lts 70b6ab09a34b 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/23 20:27 android13-5.10-lts 70b6ab09a34b 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/22 21:44 android13-5.10-lts 70b6ab09a34b 36c961ad .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/21 21:33 android13-5.10-lts 8d3bb9cb3b7d af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/21 19:48 android13-5.10-lts 8d3bb9cb3b7d af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/21 08:20 android13-5.10-lts 8d3bb9cb3b7d af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/21 08:14 android13-5.10-lts 8d3bb9cb3b7d af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/21 08:14 android13-5.10-lts 8d3bb9cb3b7d af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/21 05:04 android13-5.10-lts 8d3bb9cb3b7d af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/19 23:58 android13-5.10-lts 1d535cec0cb4 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/19 16:26 android13-5.10-lts 1d535cec0cb4 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/19 07:09 android13-5.10-lts d82f901b3eb5 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/19 05:18 android13-5.10-lts d82f901b3eb5 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/19 03:45 android13-5.10-lts d82f901b3eb5 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/19 02:45 android13-5.10-lts d82f901b3eb5 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/19 02:45 android13-5.10-lts d82f901b3eb5 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/11 04:32 android13-5.10-lts 4e1bc8d8e8ae 33b9e058 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir
* Struck through repros no longer work on HEAD.