KMSAN: uninit-value in vsscanf

Status: auto-closed as invalid on 2022/09/27 18:52
Subsystems: bluetooth
[Documentation on labels]
First crash: 1677d, last: 1611d
▶ ▼ Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in vsscanf (2) mm 2 syz, C 11 586d 592d 28/29 fixed on 2025/05/06 15:33
linux-4.19 BUG: unable to handle kernel paging request in vsscanf (2) 8 2 1750d 1852d 0/1 auto-closed as invalid on 2022/02/11 22:53
linux-4.19 BUG: unable to handle kernel paging request in vsscanf (3) 8 1 1558d 1558d 0/1 auto-closed as invalid on 2022/08/22 19:56
upstream KMSAN: uninit-value in snd_pcm_hw_rule_add (2) sound 7 18 1505d 1772d 0/29 auto-closed as invalid on 2022/09/15 02:38
upstream KMSAN: uninit-value in seq_printf (2) fs 7 syz, C 99 1506d 1773d 0/29 auto-closed as invalid on 2022/09/30 02:43
upstream KMSAN: uninit-value in hid_connect kernel 7 syz, C 176 1367d 1717d 0/29 closed as invalid on 2022/11/03 08:52
upstream KMSAN: uninit-value in number (4) kernel 7 syz, C 7189 1346d 1724d 0/29 closed as invalid on 2022/11/28 10:01
upstream KMSAN: uninit-value in preempt_count_add kernel 19 syz, C 6657 1391d 1391d 0/29 closed as invalid on 2022/10/10 13:29
upstream KMSAN: uninit-value in profile_hits (3) kernel 19 syz, C 1529 733d 947d 27/29 fixed on 2024/08/23 02:59
upstream KMSAN: kernel-infoleak in _copy_to_iter (7) net 21 syz, C 138977 1253d 1605d 22/29 fixed on 2023/02/24 13:50
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2022/09/27 16:30 20m retest repro https://github.com/google/kmsan.git master OK log

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in vsscanf+0x3dbc/0x4400 lib/vsprintf.c:3649
 vsscanf+0x3dbc/0x4400 lib/vsprintf.c:3649
 sscanf+0x206/0x250 lib/vsprintf.c:3702
 get_l2cap_conn+0x1d6/0x760 net/bluetooth/6lowpan.c:960
 lowpan_control_write+0x31d/0xf70 net/bluetooth/6lowpan.c:1100
 full_proxy_write+0x2c2/0x440 fs/debugfs/file.c:236
 vfs_write+0x8ce/0x2030 fs/read_write.c:588
 ksys_write+0x28b/0x510 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0xdb/0x120 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Local variable info created at:
 console_unlock+0x54/0x1d60 kernel/printk/printk.c:2608
 vcs_write+0x2786/0x2940 drivers/tty/vt/vc_screen.c:699

CPU: 0 PID: 4815 Comm: syz-executor.2 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/01/09 19:21 https://github.com/google/kmsan.git master 81c325bbf94e 2ca0d385 .config console log report syz ci-upstream-kmsan-gce KMSAN: uninit-value in vsscanf
2022/03/02 18:38 https://github.com/google/kmsan.git master 724946410067 45a13a73 .config console log report info ci-upstream-kmsan-gce KMSAN: uninit-value in vsscanf
2022/01/09 14:34 https://github.com/google/kmsan.git master 81c325bbf94e 2ca0d385 .config console log report info ci-upstream-kmsan-gce KMSAN: uninit-value in vsscanf
2022/01/03 20:14 https://github.com/google/kmsan.git master 81c325bbf94e 4a3f34f2 .config console log report info ci-upstream-kmsan-gce KMSAN: uninit-value in vsscanf
2021/12/30 23:25 https://github.com/google/kmsan.git master 81c325bbf94e 2e49f10d .config console log report info ci-upstream-kmsan-gce KMSAN: uninit-value in vsscanf
2022/01/14 15:39 https://github.com/google/kmsan.git master fa3879a274df 53e00b45 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in vsscanf
2022/01/12 02:42 https://github.com/google/kmsan.git master fa3879a274df 44d1319a .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in vsscanf
2022/01/11 16:04 https://github.com/google/kmsan.git master fa3879a274df 1884f55a .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in vsscanf
2021/12/26 14:40 https://github.com/google/kmsan.git master 81c325bbf94e e4f103c4 .config console log report info ci-upstream-kmsan-gce-386 KMSAN: uninit-value in vsscanf
* Struck through repros no longer work on HEAD.