syzbot


KASAN: stack-out-of-bounds Read in __show_regs (2)

Status: upstream: reported syz repro on 2024/06/15 07:06
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+e9be5674af5e3a0b9ecc@syzkaller.appspotmail.com
First crash: 32d, last: 1d13h
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [kernel?] KASAN: stack-out-of-bounds Read in __show_regs (2) 8 (10) 2024/07/07 10:32
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 KASAN: stack-out-of-bounds Read in __show_regs 1 373d 373d 0/2 auto-obsoleted due to no activity on 2023/10/03 16:34
upstream KASAN: stack-out-of-bounds Read in __show_regs kernel C unreliable unreliable 517 618d 1122d 0/27 auto-obsoleted due to no activity on 2023/05/14 10:00

Sample crash report:
Code: ff 92 48 c7 c6 10 bc 6f 81 e8 8f 04 0a 00 e8 fa 18 0a 00 e9 e5 fb ff ff e8 c0 62 21 0a 41 f7 c7 00 02 00 00 74 d0 fb 45 84 f6 <75> cf eb e0 90 0f 0b 90 45 31 f6 e9 62 ff ff ff 90 0f 0b 90 e9 a1
RSP: bb46:ffffc900001077d8 EFLAGS: 00000a03 ORIG_RAX: ffffc90000107740
RAX: dffffc0000000000 RBX: 1ffff92000020ee8 RCX: ffffffff947f4803
RDX: 0000000000000001 RSI: ffffffff8bcad5e0 RDI: 1ffff92000020ee8
==================================================================
BUG: KASAN: stack-out-of-bounds in __show_regs+0x172/0x610 arch/x86/kernel/process_64.c:87
Read of size 8 at addr ffffc90000107678 by task udevd/5582

CPU: 0 UID: 0 PID: 5582 Comm: udevd Not tainted 6.10.0-rc6-next-20240703-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 __show_regs+0x172/0x610 arch/x86/kernel/process_64.c:87
 show_trace_log_lvl+0x3d4/0x520 arch/x86/kernel/dumpstack.c:301
 sched_show_task+0x506/0x6d0 kernel/sched/core.c:7509
 report_rtnl_holders+0x320/0x3f0 net/core/rtnetlink.c:110
 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1792
 expire_timers kernel/time/timer.c:1843 [inline]
 __run_timers kernel/time/timer.c:2417 [inline]
 __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2428
 run_timer_base kernel/time/timer.c:2437 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447
 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:tomoyo_profile+0x2c/0x50 security/tomoyo/common.c:530
Code: 1f 00 41 56 53 89 f3 49 89 fe e8 1f f9 2f fd 89 d8 49 8d 1c c6 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 48 89 df e8 0a c4 96 fd 48 8b 0b 48 85 c9 48 c7 c0 80 6a 99
RSP: 0018:ffffc9000364f550 EFLAGS: 00000246
RAX: 1ffffffff2933018 RBX: ffffffff949980c0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff949980c0
RBP: 0000000000000001 R08: ffffffff8466e320 R09: 0000000000000000
R10: ffffc9000364f620 R11: fffff520006c9ece R12: ffffc9000364f620
R13: 0000000000000000 R14: ffffffff949980c0 R15: 0000000000000001
 tomoyo_get_mode security/tomoyo/util.c:1000 [inline]
 tomoyo_init_request_info+0x107/0x350 security/tomoyo/util.c:1031
 tomoyo_check_open_permission+0x23e/0x500 security/tomoyo/file.c:769
 security_file_open+0x6a/0x750 security/security.c:2991
 do_dentry_open+0x38e/0x1440 fs/open.c:946
 vfs_open+0x3e/0x330 fs/open.c:1089
 do_open fs/namei.c:3684 [inline]
 path_openat+0x2b3e/0x3470 fs/namei.c:3843
 do_filp_open+0x235/0x490 fs/namei.c:3870
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_openat fs/open.c:1447 [inline]
 __se_sys_openat fs/open.c:1442 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1442
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fef4f51a477
Code: 10 00 00 00 44 8b 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 44 89 c2 4c 89 ce bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 10 48 8b 15 82 69 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007fffc91b2d98 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fffc91b31d8 RCX: 00007fef4f51a477
RDX: 0000000000090800 RSI: 00007fffc91b31d8 RDI: 00000000ffffff9c
RBP: 00007fffc91b35d8 R08: 0000000000090800 R09: 00007fffc91b31d8
R10: 0000000000000000 R11: 0000000000000287 R12: 00007fffc91b2dd8
R13: 0000563531ce32a0 R14: 0000563531cf2970 R15: 0000000000000001
 </TASK>

The buggy address belongs to the virtual mapping at
 [ffffc90000100000, ffffc90000109000) created by:
 copy_process+0x5d1/0x3d90 kernel/fork.c:2206

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17293
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x2dc2(GFP_KERNEL|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), pid 2, tgid 2 (kthreadd), ts 2802795760, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493
 prep_new_page mm/page_alloc.c:1501 [inline]
 get_page_from_freelist+0x2ccb/0x2d80 mm/page_alloc.c:3480
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4738
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2263
 vm_area_alloc_pages mm/vmalloc.c:3584 [inline]
 __vmalloc_area_node mm/vmalloc.c:3660 [inline]
 __vmalloc_node_range_noprof+0x971/0x1460 mm/vmalloc.c:3841
 alloc_thread_stack_node kernel/fork.c:314 [inline]
 dup_task_struct+0x444/0x8c0 kernel/fork.c:1115
 copy_process+0x5d1/0x3d90 kernel/fork.c:2206
 kernel_clone+0x226/0x8f0 kernel/fork.c:2788
 kernel_thread+0x1bc/0x240 kernel/fork.c:2850
 create_kthread kernel/kthread.c:412 [inline]
 kthreadd+0x60d/0x810 kernel/kthread.c:765
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
page_owner free stack trace missing

Memory state around the buggy address:
 ffffc90000107500: f2 f2 00 f2 f2 f2 00 00 00 00 00 00 f2 f2 f2 f2
 ffffc90000107580: 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 00 00 00 00
>ffffc90000107600: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2
                                                                ^
 ffffc90000107680: 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc90000107700: 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 00 f3 f3 f3
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	92                   	xchg   %eax,%edx
   1:	48 c7 c6 10 bc 6f 81 	mov    $0xffffffff816fbc10,%rsi
   8:	e8 8f 04 0a 00       	call   0xa049c
   d:	e8 fa 18 0a 00       	call   0xa190c
  12:	e9 e5 fb ff ff       	jmp    0xfffffbfc
  17:	e8 c0 62 21 0a       	call   0xa2162dc
  1c:	41 f7 c7 00 02 00 00 	test   $0x200,%r15d
  23:	74 d0                	je     0xfffffff5
  25:	fb                   	sti
  26:	45 84 f6             	test   %r14b,%r14b
* 29:	75 cf                	jne    0xfffffffa <-- trapping instruction
  2b:	eb e0                	jmp    0xd
  2d:	90                   	nop
  2e:	0f 0b                	ud2
  30:	90                   	nop
  31:	45 31 f6             	xor    %r14d,%r14d
  34:	e9 62 ff ff ff       	jmp    0xffffff9b
  39:	90                   	nop
  3a:	0f 0b                	ud2
  3c:	90                   	nop
  3d:	e9                   	.byte 0xe9
  3e:	a1                   	.byte 0xa1

Crashes (1338):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/07/08 07:32 linux-next 0b58e108042b bc4ebbb5 .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 14:01 linux-next 0b58e108042b bc4ebbb5 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/06/23 11:37 linux-next f76698bd9a8c edc5149a .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: out-of-bounds Read in __show_regs
2024/07/11 19:38 linux-next 523b23f0bee3 c699c2eb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/11 14:51 linux-next 523b23f0bee3 c699c2eb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/09 06:37 linux-next 0b58e108042b bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/09 05:28 linux-next 0b58e108042b bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/09 04:00 linux-next 0b58e108042b bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/09 03:28 linux-next 0b58e108042b bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/09 02:26 linux-next 0b58e108042b bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/09 01:24 linux-next 0b58e108042b bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/09 00:14 linux-next 0b58e108042b cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 21:23 linux-next 0b58e108042b cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 20:18 linux-next 0b58e108042b cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 17:46 linux-next 0b58e108042b cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 16:35 linux-next 0b58e108042b cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 15:34 linux-next 0b58e108042b cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 14:19 linux-next 0b58e108042b cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 13:08 linux-next 0b58e108042b cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 12:02 linux-next 0b58e108042b cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 10:49 linux-next 0b58e108042b cde64f7d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 08:52 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 07:31 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 06:09 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 04:27 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 03:11 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 01:19 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 00:08 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/08 00:02 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 22:59 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 21:32 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 20:14 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 19:14 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 17:23 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 16:00 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 13:02 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 11:25 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 10:03 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 08:57 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 06:53 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 01:36 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/07 00:26 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/06 22:42 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/06 21:15 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/06 20:04 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/06 19:03 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/06 18:20 linux-next 0b58e108042b bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/06/15 04:33 linux-next a957267fa7e9 8d849073 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/06/11 07:03 linux-next a957267fa7e9 048c640a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: stack-out-of-bounds Read in __show_regs
2024/07/09 08:47 linux-next 0b58e108042b bc23a442 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: out-of-bounds Read in __show_regs
2024/07/06 02:30 linux-next 0b58e108042b 2a40360c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: out-of-bounds Read in __show_regs
* Struck through repros no longer work on HEAD.