syzbot


KMSAN: uninit-value in do_mbind

Status: upstream: reported C repro on 2021/05/01 06:08
Reported-by: syzbot+0bdecd1b2c19a1faa92d@syzkaller.appspotmail.com
First crash: 434d, last: 356d
Patch testing requests:
Created Duration User Patch Repo Result
2022/04/16 05:38 20m fujimotokosuke0@gmail.com https://github.com/google/kmsan.git master report log
2021/06/26 10:30 39m asha.16@itfac.mrt.ac.lk https://github.com/google/kmsan.git 4ebaab5f report log
2021/06/26 10:27 28m asha.16@itfac.mrt.ac.lk https://github.com/google/kmsan.git master report log
2021/06/26 10:24 15m asha.16@itfac.mrt.ac.lk https://github.com/google/kmsan.git 4ebaab5f report log
2021/06/17 23:45 13m wupco1996@gmail.com patch https://github.com/google/kmsan.git master error
2021/06/17 05:48 22m wupco1996@gmail.com patch https://github.com/google/kmsan.git master OK
2021/06/11 07:32 16m mudongliangabcd@gmail.com patch https://github.com/google/kmsan.git master report log
2021/06/11 06:03 20m mudongliangabcd@gmail.com patch https://github.com/google/kmsan.git master report log

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in __mpol_equal mm/mempolicy.c:2340 [inline]
BUG: KMSAN: uninit-value in mpol_equal include/linux/mempolicy.h:108 [inline]
BUG: KMSAN: uninit-value in mbind_range mm/mempolicy.c:825 [inline]
BUG: KMSAN: uninit-value in do_mbind+0x2d1b/0x38c0 mm/mempolicy.c:1350
CPU: 0 PID: 8230 Comm: syz-executor736 Not tainted 5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x24c/0x2e0 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197
 __mpol_equal mm/mempolicy.c:2340 [inline]
 mpol_equal include/linux/mempolicy.h:108 [inline]
 mbind_range mm/mempolicy.c:825 [inline]
 do_mbind+0x2d1b/0x38c0 mm/mempolicy.c:1350
 kernel_mbind mm/mempolicy.c:1478 [inline]
 __do_sys_mbind mm/mempolicy.c:1485 [inline]
 __se_sys_mbind+0x3a6/0x3c0 mm/mempolicy.c:1481
 __x64_sys_mbind+0x6e/0x90 mm/mempolicy.c:1481
 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4456f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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:00007ffba6b01308 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed
RAX: ffffffffffffffda RBX: 00000000004ca408 RCX: 00000000004456f9
RDX: 0000000000002001 RSI: 0000000000800000 RDI: 0000000020001000
RBP: 00000000004ca400 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ca40c
R13: 00007ffe836a899f R14: 00007ffba6b01400 R15: 0000000000022000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:120 [inline]
 kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:103
 kmsan_slab_alloc+0x8e/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2922 [inline]
 slab_alloc mm/slub.c:2931 [inline]
 kmem_cache_alloc+0x895/0x1030 mm/slub.c:2936
 mpol_new mm/mempolicy.c:302 [inline]
 do_mbind+0x8d5/0x38c0 mm/mempolicy.c:1306
 kernel_mbind mm/mempolicy.c:1478 [inline]
 __do_sys_mbind mm/mempolicy.c:1485 [inline]
 __se_sys_mbind+0x3a6/0x3c0 mm/mempolicy.c:1481
 __x64_sys_mbind+0x6e/0x90 mm/mempolicy.c:1481
 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xae
=====================================================

Crashes (9):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kmsan-gce 2021/07/11 09:05 https://github.com/google/kmsan.git master 57b5797c8013 8f5a7b8c .config log report syz C KMSAN: uninit-value in do_mbind
ci-upstream-kmsan-gce 2021/04/24 07:08 https://github.com/google/kmsan.git master 4ebaab5fb428 17f0b706 .config log report syz C KMSAN: uninit-value in do_mbind
ci-upstream-kmsan-gce 2021/06/23 10:31 https://github.com/google/kmsan.git master 6a6a67f21dec aba2b2fb .config log report info KMSAN: uninit-value in do_mbind
ci-upstream-kmsan-gce 2021/06/10 14:14 https://github.com/google/kmsan.git master 6099c9da2f7d 1ba81399 .config log report info KMSAN: uninit-value in do_mbind
ci-upstream-kmsan-gce 2021/05/26 19:20 https://github.com/google/kmsan.git master 6099c9da2f7d 54f0bcf1 .config log report info KMSAN: uninit-value in do_mbind
ci-upstream-kmsan-gce 2021/05/13 21:37 https://github.com/google/kmsan.git master bdefec9ab855 80f9b418 .config log report info KMSAN: uninit-value in do_mbind
ci-upstream-kmsan-gce-386 2021/06/23 11:37 https://github.com/google/kmsan.git master 6a6a67f21dec aba2b2fb .config log report info KMSAN: uninit-value in do_mbind
ci-upstream-kmsan-gce-386 2021/06/10 14:21 https://github.com/google/kmsan.git master 6099c9da2f7d 1ba81399 .config log report info KMSAN: uninit-value in do_mbind
ci-upstream-kmsan-gce-386 2021/05/26 19:23 https://github.com/google/kmsan.git master 6099c9da2f7d 54f0bcf1 .config log report info KMSAN: uninit-value in do_mbind