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KMSAN: kernel-infoleak in fuzzer_ioctl

Status: closed as invalid on 2019/09/16 16:08
Subsystems: usb
[Documentation on labels]
First crash: 2028d, last: 1970d
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: kernel-infoleak in fuzzer_ioctl (2) usb C 179 1912d 1959d 0/28 auto-closed as invalid on 2022/09/09 10:44

Sample crash report:
==================================================================
BUG: KMSAN: kernel-infoleak in _copy_to_user+0x16b/0x1f0 lib/usercopy.c:32
CPU: 0 PID: 12521 Comm: syz-executor117 Not tainted 5.3.0-rc3+ #17
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+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan_report.c:109
 kmsan_internal_check_memory+0x7be/0x8d0 mm/kmsan/kmsan.c:551
 kmsan_copy_to_user+0xa9/0xb0 mm/kmsan/kmsan_hooks.c:493
 _copy_to_user+0x16b/0x1f0 lib/usercopy.c:32
 copy_to_user include/linux/uaccess.h:174 [inline]
 fuzzer_ioctl_ep0_read drivers/usb/gadget/fuzzer/fuzzer.c:982 [inline]
 fuzzer_ioctl+0x511f/0x5690 drivers/usb/gadget/fuzzer/fuzzer.c:1398
 full_proxy_unlocked_ioctl+0x1ca/0x380 fs/debugfs/file.c:205
 do_vfs_ioctl+0xea8/0x2c50 fs/ioctl.c:46
 ksys_ioctl fs/ioctl.c:713 [inline]
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl+0x1da/0x270 fs/ioctl.c:718
 __x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:718
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x440947
Code: 48 83 c4 08 48 89 d8 5b 5d c3 66 0f 1f 84 00 00 00 00 00 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb 92 66 90 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 cd 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffda9b09038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000440947
RDX: 00007ffda9b09050 RSI: 00000000c0085504 RDI: 0000000000000003
RBP: 0000000000000040 R08: 00000000000d8305 R09: 0000000000000000
R10: 0000000000402330 R11: 0000000000000246 R12: 00007ffda9b09050
R13: 0000000000402330 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:187 [inline]
 kmsan_internal_poison_shadow+0x53/0xa0 mm/kmsan/kmsan.c:146
 kmsan_slab_alloc+0xaa/0x120 mm/kmsan/kmsan_hooks.c:175
 slab_alloc_node mm/slub.c:2790 [inline]
 slab_alloc mm/slub.c:2799 [inline]
 __kmalloc+0x28e/0x430 mm/slub.c:3830
 kmalloc include/linux/slab.h:557 [inline]
 fuzzer_ioctl_ep0_read drivers/usb/gadget/fuzzer/fuzzer.c:926 [inline]
 fuzzer_ioctl+0x2b09/0x5690 drivers/usb/gadget/fuzzer/fuzzer.c:1398
 full_proxy_unlocked_ioctl+0x1ca/0x380 fs/debugfs/file.c:205
 do_vfs_ioctl+0xea8/0x2c50 fs/ioctl.c:46
 ksys_ioctl fs/ioctl.c:713 [inline]
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl+0x1da/0x270 fs/ioctl.c:718
 __x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:718
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Byte 0 of 1 is uninitialized
Memory access of size 1 starts at ffff888106c49458
Data copied to user address 00007ffda9b09058
==================================================================

Crashes (34):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/08/11 22:29 https://github.com/google/kmsan.git master 61ccdad1fcdf acb51638 .config console log report syz C ci-upstream-kmsan-gce
2019/08/01 14:12 https://github.com/google/kmsan.git master beaab8a31e0d c692b5bd .config console log report syz C ci-upstream-kmsan-gce
2019/07/28 12:05 https://github.com/google/kmsan.git master beaab8a31e0d c85e1c5b .config console log report syz C ci-upstream-kmsan-gce
2019/07/17 20:03 https://github.com/google/kmsan.git master beaab8a31e0d f613a7c4 .config console log report syz C ci-upstream-kmsan-gce
2019/09/07 05:07 https://github.com/google/kmsan.git master 014077b5cd62 a60cb4cd .config console log report ci-upstream-kmsan-gce
2019/09/06 20:50 https://github.com/google/kmsan.git master 014077b5cd62 a60cb4cd .config console log report ci-upstream-kmsan-gce
2019/09/05 18:26 https://github.com/google/kmsan.git master 040b8306f758 040fda58 .config console log report ci-upstream-kmsan-gce
2019/09/04 17:26 https://github.com/google/kmsan.git master 4b523a2dfab0 12381952 .config console log report ci-upstream-kmsan-gce
2019/09/04 17:17 https://github.com/google/kmsan.git master 4b523a2dfab0 12381952 .config console log report ci-upstream-kmsan-gce
2019/09/04 13:57 https://github.com/google/kmsan.git master 4b523a2dfab0 12381952 .config console log report ci-upstream-kmsan-gce
2019/08/30 00:18 https://github.com/google/kmsan.git master 77d232b6aa76 fd37b39e .config console log report ci-upstream-kmsan-gce
2019/08/22 22:58 https://github.com/google/kmsan.git master 61ccdad1fcdf d003d6d0 .config console log report ci-upstream-kmsan-gce
2019/08/21 20:16 https://github.com/google/kmsan.git master 61ccdad1fcdf 4ea67ff8 .config console log report ci-upstream-kmsan-gce
2019/08/21 08:48 https://github.com/google/kmsan.git master 61ccdad1fcdf 4ea67ff8 .config console log report ci-upstream-kmsan-gce
2019/08/20 21:25 https://github.com/google/kmsan.git master 61ccdad1fcdf cfc9868f .config console log report ci-upstream-kmsan-gce
2019/08/19 19:05 https://github.com/google/kmsan.git master 61ccdad1fcdf ee12860b .config console log report ci-upstream-kmsan-gce
2019/08/19 01:40 https://github.com/google/kmsan.git master 61ccdad1fcdf 55bf8926 .config console log report ci-upstream-kmsan-gce
2019/08/19 01:02 https://github.com/google/kmsan.git master 61ccdad1fcdf 55bf8926 .config console log report ci-upstream-kmsan-gce
2019/08/16 15:34 https://github.com/google/kmsan.git master 61ccdad1fcdf 8fd428a1 .config console log report ci-upstream-kmsan-gce
2019/08/16 07:50 https://github.com/google/kmsan.git master 61ccdad1fcdf 8fd428a1 .config console log report ci-upstream-kmsan-gce
2019/08/14 19:35 https://github.com/google/kmsan.git master 61ccdad1fcdf 5576551b .config console log report ci-upstream-kmsan-gce
2019/08/14 19:32 https://github.com/google/kmsan.git master 61ccdad1fcdf 5576551b .config console log report ci-upstream-kmsan-gce
2019/08/13 23:30 https://github.com/google/kmsan.git master 61ccdad1fcdf ef801a3e .config console log report ci-upstream-kmsan-gce
2019/08/13 15:58 https://github.com/google/kmsan.git master 61ccdad1fcdf 8620c2c2 .config console log report ci-upstream-kmsan-gce
2019/08/13 15:50 https://github.com/google/kmsan.git master 61ccdad1fcdf 8620c2c2 .config console log report ci-upstream-kmsan-gce
2019/08/12 16:55 https://github.com/google/kmsan.git master 61ccdad1fcdf acb51638 .config console log report ci-upstream-kmsan-gce
2019/08/09 03:20 https://github.com/google/kmsan.git master 61ccdad1fcdf ede31a9b .config console log report ci-upstream-kmsan-gce
2019/08/09 02:01 https://github.com/google/kmsan.git master 61ccdad1fcdf ede31a9b .config console log report ci-upstream-kmsan-gce
2019/08/09 00:24 https://github.com/google/kmsan.git master 61ccdad1fcdf ede31a9b .config console log report ci-upstream-kmsan-gce
2019/08/08 18:57 https://github.com/google/kmsan.git master 61ccdad1fcdf e6ebef88 .config console log report ci-upstream-kmsan-gce
2019/08/06 20:27 https://github.com/google/kmsan.git master ae0c578a3cdf c6f01e54 .config console log report ci-upstream-kmsan-gce
2019/08/03 15:00 https://github.com/google/kmsan.git master beaab8a31e0d 6affd8e8 .config console log report ci-upstream-kmsan-gce
2019/07/17 16:27 https://github.com/google/kmsan.git master beaab8a31e0d f613a7c4 .config console log report ci-upstream-kmsan-gce
2019/07/11 20:11 https://github.com/google/kmsan.git master 7280182c67ba 186a30b9 .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.