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KMSAN: kernel-infoleak in semctl_main

Status: closed as invalid on 2018/09/19 14:33
Subsystems: kernel
[Documentation on labels]
First crash: 2114d, last: 2053d
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: kernel-infoleak in semctl_main (2) kernel 3 2032d 2035d 0/26 closed as invalid on 2018/10/10 13:44

Sample crash report:
RDX: 000000000000000d RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000004
R13: 00000000004c0c8f R14: 00000000004d11e8 R15: 0000000000000000
==================================================================
BUG: KMSAN: kernel-infoleak in copy_to_user include/linux/uaccess.h:184 [inline]
BUG: KMSAN: kernel-infoleak in semctl_main+0x1361/0x5980 ipc/sem.c:1448
CPU: 1 PID: 4571 Comm: syz-executor0 Not tainted 4.18.0-rc4+ #27
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+0x185/0x1e0 lib/dump_stack.c:113
 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:982
 kmsan_internal_check_memory+0x148/0x210 mm/kmsan/kmsan.c:1027
 kmsan_copy_to_user+0x83/0xe0 mm/kmsan/kmsan_hooks.c:479
 copy_to_user include/linux/uaccess.h:184 [inline]
 semctl_main+0x1361/0x5980 ipc/sem.c:1448
 ksys_semctl+0x5ef/0x730 ipc/sem.c:1663
 __do_sys_semctl ipc/sem.c:1687 [inline]
 __se_sys_semctl ipc/sem.c:1685 [inline]
 __x64_sys_semctl+0x11e/0x170 ipc/sem.c:1685
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ab9
Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007ffcdd889cd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000042
RAX: ffffffffffffffda RBX: 00000000019b5914 RCX: 0000000000455ab9
RDX: 000000000000000d RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000004
R13: 00000000004c0c8f R14: 00000000004d11e8 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_internal_alloc_meta_for_pages+0x157/0x730 mm/kmsan/kmsan.c:694
 kmsan_alloc_page+0x80/0xe0 mm/kmsan/kmsan_hooks.c:250
 __alloc_pages_nodemask+0x105b/0x6320 mm/page_alloc.c:4409
 alloc_pages_current+0x6b1/0x970 mm/mempolicy.c:2093
 alloc_pages include/linux/gfp.h:494 [inline]
 __vmalloc_area_node mm/vmalloc.c:1689 [inline]
 __vmalloc_node_range+0x8bf/0x1170 mm/vmalloc.c:1754
 __vmalloc_node mm/vmalloc.c:1799 [inline]
 __vmalloc_node_flags_caller+0x12b/0x140 mm/vmalloc.c:1821
 kvmalloc_node+0x330/0x370 mm/util.c:432
 kvmalloc include/linux/mm.h:557 [inline]
 kvmalloc_array include/linux/mm.h:575 [inline]
 semctl_main+0xcf2/0x5980 ipc/sem.c:1429
 ksys_semctl+0x5ef/0x730 ipc/sem.c:1663
 __do_sys_semctl ipc/sem.c:1687 [inline]
 __se_sys_semctl ipc/sem.c:1685 [inline]
 __x64_sys_semctl+0x11e/0x170 ipc/sem.c:1685
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Bytes 4096-4101 of 4110 are uninitialized
Memory access starts at ffffc9000194e000
==================================================================

Crashes (13):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/07/14 05:15 https://github.com/google/kmsan.git master 80ecacc456c1 92a49505 .config console log report syz ci-upstream-kmsan-gce
2018/07/13 12:56 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report syz ci-upstream-kmsan-gce
2018/09/03 18:01 https://github.com/google/kmsan.git master 28f0ca98eadf a4718693 .config console log report ci-upstream-kmsan-gce
2018/08/31 21:03 https://github.com/google/kmsan.git master 28f0ca98eadf a4718693 .config console log report ci-upstream-kmsan-gce
2018/07/24 02:37 https://github.com/google/kmsan.git master d1c2a46a46f6 912c93d7 .config console log report ci-upstream-kmsan-gce
2018/07/22 09:26 https://github.com/google/kmsan.git master d1c2a46a46f6 8cc079c3 .config console log report ci-upstream-kmsan-gce
2018/07/14 04:12 https://github.com/google/kmsan.git master 80ecacc456c1 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 17:48 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/13 12:42 https://github.com/google/kmsan.git master e74f81fe9c5d 92a49505 .config console log report ci-upstream-kmsan-gce
2018/07/11 06:32 https://github.com/google/kmsan.git master b64f7ec04e12 2e0e3130 .config console log report ci-upstream-kmsan-gce
2018/07/08 14:44 https://github.com/google/kmsan.git master a00de5aa4da3 c9a7a4dc .config console log report ci-upstream-kmsan-gce
2018/07/07 16:06 https://github.com/google/kmsan.git master a00de5aa4da3 ab89aea9 .config console log report ci-upstream-kmsan-gce
2018/07/05 00:07 https://github.com/google/kmsan.git master accdc89e1dc3 e1b966c6 .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.