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KCSAN: data-race in key_task_permission / keyctl_chown_key (3)

Status: auto-obsoleted due to no activity on 2023/11/24 13:01
Subsystems: keyrings lsm
[Documentation on labels]
First crash: 220d, last: 220d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in key_task_permission / keyctl_chown_key keyrings lsm 1 606d 606d 0/26 auto-obsoleted due to no activity on 2022/11/03 09:37
upstream KCSAN: data-race in key_task_permission / keyctl_chown_key (2) keyrings lsm 1 329d 329d 0/26 auto-obsoleted due to no activity on 2023/08/08 03:56
upstream KCSAN: data-race in key_task_permission / keyctl_chown_key (4) keyrings lsm 1 121d 121d 0/26 auto-obsoleted due to no activity on 2024/03/03 01:25

Sample crash report:
==================================================================
BUG: KCSAN: data-race in key_task_permission / keyctl_chown_key

write to 0xffff88814b4b6b68 of 4 bytes by task 17395 on cpu 0:
 keyctl_chown_key+0x53d/0x5b0 security/keys/keyctl.c:1040
 __do_sys_keyctl security/keys/keyctl.c:1921 [inline]
 __se_sys_keyctl+0x112/0xbc0 security/keys/keyctl.c:1874
 __x64_sys_keyctl+0x67/0x80 security/keys/keyctl.c:1874
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88814b4b6b68 of 4 bytes by task 17389 on cpu 1:
 key_task_permission+0x11f/0x2b0 security/keys/permission.c:54
 lookup_user_key+0x9e7/0xde0 security/keys/process_keys.c:803
 keyctl_setperm_key security/keys/keyctl.c:1082 [inline]
 __do_sys_keyctl security/keys/keyctl.c:1926 [inline]
 __se_sys_keyctl+0x83e/0xbc0 security/keys/keyctl.c:1874
 __x64_sys_keyctl+0x67/0x80 security/keys/keyctl.c:1874
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000 -> 0x0000ee01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17389 Comm: syz-executor.1 Not tainted 6.6.0-rc6-syzkaller-00182-gce55c22ec8b2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/10/20 12:50 upstream ce55c22ec8b2 a42250d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in key_task_permission / keyctl_chown_key
* Struck through repros no longer work on HEAD.