syzbot


KASAN: null-ptr-deref Write in d_delete

Status: auto-closed as invalid on 2022/06/25 18:25
Reported-by: syzbot+f59e967603eaa94970d4@syzkaller.appspotmail.com
First crash: 846d, last: 846d

Sample crash report:
RBP: 00007f6d3f72a08d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffb83c212f R14: 00007f6d3e846300 R15: 0000000000022000
---[ end trace 191939e9a8a2f9b1 ]---
==================================================================
BUG: KASAN: null-ptr-deref in atomic_try_cmpxchg include/asm-generic/atomic-instrumented.h:693 [inline]
BUG: KASAN: null-ptr-deref in queued_spin_lock include/asm-generic/qspinlock.h:78 [inline]
BUG: KASAN: null-ptr-deref in do_raw_spin_lock include/linux/spinlock.h:181 [inline]
BUG: KASAN: null-ptr-deref in __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
BUG: KASAN: null-ptr-deref in _raw_spin_lock+0x5f/0x170 kernel/locking/spinlock.c:151
Write of size 4 at addr 0000000000000088 by task syz-executor.1/594

CPU: 0 PID: 594 Comm: syz-executor.1 Tainted: G        W         5.4.161-syzkaller-00025-g961dd91cc692 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18e/0x1de lib/dump_stack.c:118
 __kasan_report+0x178/0x260 mm/kasan/report.c:520
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 check_memory_region_inline mm/kasan/generic.c:141 [inline]
 check_memory_region+0x2a5/0x2e0 mm/kasan/generic.c:191
 atomic_try_cmpxchg include/asm-generic/atomic-instrumented.h:693 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:78 [inline]
 do_raw_spin_lock include/linux/spinlock.h:181 [inline]
 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_lock+0x5f/0x170 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:338 [inline]
 d_delete+0x46/0x100 fs/dcache.c:2444
 vfs_rmdir+0x1c9/0x3e0 fs/namei.c:3971
 incfs_kill_sb+0x9b/0xe0 fs/incfs/vfs.c:1885
 deactivate_locked_super+0xaf/0x100 fs/super.c:335
 deactivate_super+0x168/0x210 fs/super.c:366
 cleanup_mnt+0x432/0x4e0 fs/namespace.c:1102
 task_work_run+0x186/0x1b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:163 [inline]
 prepare_exit_to_usermode+0x2b0/0x310 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f6d3f6d0049
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6d3e846168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f6d3f7e2f60 RCX: 00007f6d3f6d0049
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180
RBP: 00007f6d3f72a08d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffb83c212f R14: 00007f6d3e846300 R15: 0000000000022000
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000088
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 1dd6df067 P4D 1dd6df067 PUD 1e0caa067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 594 Comm: syz-executor.1 Tainted: G    B   W         5.4.161-syzkaller-00025-g961dd91cc692 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:200 [inline]
RIP: 0010:atomic_try_cmpxchg include/asm-generic/atomic-instrumented.h:695 [inline]
RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:78 [inline]
RIP: 0010:do_raw_spin_lock include/linux/spinlock.h:181 [inline]
RIP: 0010:__raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
RIP: 0010:_raw_spin_lock+0x82/0x170 kernel/locking/spinlock.c:151
Code: 00 00 e8 21 6e 69 fd 48 89 df be 04 00 00 00 e8 14 6e 69 fd 42 8a 44 35 00 84 c0 0f 85 a0 00 00 00 8b 44 24 04 b9 01 00 00 00 <f0> 41 0f b1 0c 24 75 21 65 48 8b 04 25 28 00 00 00 48 3b 44 24 08
RSP: 0018:ffff8881dc8c7d10 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8881dc8c7d14 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff8881dc8c7d14
RBP: 1ffff1103b918fa2 R08: dffffc0000000000 R09: ffffed103b918fa3
R10: ffffed103b918fa3 R11: 0000000000000000 R12: 0000000000000088
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000200108
FS:  00007f6d3e846700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000088 CR3: 00000001dbef0000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 spin_lock include/linux/spinlock.h:338 [inline]
 d_delete+0x46/0x100 fs/dcache.c:2444
 vfs_rmdir+0x1c9/0x3e0 fs/namei.c:3971
 incfs_kill_sb+0x9b/0xe0 fs/incfs/vfs.c:1885
 deactivate_locked_super+0xaf/0x100 fs/super.c:335
 deactivate_super+0x168/0x210 fs/super.c:366
 cleanup_mnt+0x432/0x4e0 fs/namespace.c:1102
 task_work_run+0x186/0x1b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:163 [inline]
 prepare_exit_to_usermode+0x2b0/0x310 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f6d3f6d0049
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6d3e846168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f6d3f7e2f60 RCX: 00007f6d3f6d0049
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180
RBP: 00007f6d3f72a08d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffb83c212f R14: 00007f6d3e846300 R15: 0000000000022000
Modules linked in:
CR2: 0000000000000088
---[ end trace 191939e9a8a2f9b2 ]---
RIP: 0010:arch_atomic_try_cmpxchg arch/x86/include/asm/atomic.h:200 [inline]
RIP: 0010:atomic_try_cmpxchg include/asm-generic/atomic-instrumented.h:695 [inline]
RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:78 [inline]
RIP: 0010:do_raw_spin_lock include/linux/spinlock.h:181 [inline]
RIP: 0010:__raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
RIP: 0010:_raw_spin_lock+0x82/0x170 kernel/locking/spinlock.c:151
Code: 00 00 e8 21 6e 69 fd 48 89 df be 04 00 00 00 e8 14 6e 69 fd 42 8a 44 35 00 84 c0 0f 85 a0 00 00 00 8b 44 24 04 b9 01 00 00 00 <f0> 41 0f b1 0c 24 75 21 65 48 8b 04 25 28 00 00 00 48 3b 44 24 08
RSP: 0018:ffff8881dc8c7d10 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8881dc8c7d14 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff8881dc8c7d14
RBP: 1ffff1103b918fa2 R08: dffffc0000000000 R09: ffffed103b918fa3
R10: ffffed103b918fa3 R11: 0000000000000000 R12: 0000000000000088
R13: dffffc0000000000 R14: dffffc0000000000 R15: 0000000000200108
FS:  00007f6d3e846700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000088 CR3: 00000001dbef0000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	e8 21 6e 69 fd       	callq  0xfd696e28
   7:	48 89 df             	mov    %rbx,%rdi
   a:	be 04 00 00 00       	mov    $0x4,%esi
   f:	e8 14 6e 69 fd       	callq  0xfd696e28
  14:	42 8a 44 35 00       	mov    0x0(%rbp,%r14,1),%al
  19:	84 c0                	test   %al,%al
  1b:	0f 85 a0 00 00 00    	jne    0xc1
  21:	8b 44 24 04          	mov    0x4(%rsp),%eax
  25:	b9 01 00 00 00       	mov    $0x1,%ecx
* 2a:	f0 41 0f b1 0c 24    	lock cmpxchg %ecx,(%r12) <-- trapping instruction
  30:	75 21                	jne    0x53
  32:	65 48 8b 04 25 28 00 	mov    %gs:0x28,%rax
  39:	00 00
  3b:	48 3b 44 24 08       	cmp    0x8(%rsp),%rax

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/02/25 18:25 android12-5.4 961dd91cc692 45a13a73 .config console log report info ci2-android-5-4-kasan KASAN: null-ptr-deref Write in d_delete
2022/02/25 18:02 android12-5.4 961dd91cc692 7c337266 .config console log report info ci2-android-5-4-kasan KASAN: null-ptr-deref Write in d_delete
2022/02/25 17:06 android12-5.4 961dd91cc692 7c337266 .config console log report info ci2-android-5-4-kasan KASAN: null-ptr-deref Write in d_delete
* Struck through repros no longer work on HEAD.