syzbot

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BUG: KCSAN: data-race in __se_sys_keyctl / key_task_permission

write to 0xffff88812277dd70 of 4 bytes by task 19442 on cpu 0:
 keyctl_setperm_key security/keys/keyctl.c:1098 [inline]
 __do_sys_keyctl security/keys/keyctl.c:1926 [inline]
 __se_sys_keyctl+0xab5/0xbb0 security/keys/keyctl.c:1874
 __x64_sys_keyctl+0x67/0x80 security/keys/keyctl.c:1874
 x64_sys_call+0x2bf5/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:251
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88812277dd70 of 4 bytes by task 19441 on cpu 1:
 key_task_permission+0x14a/0x2c0 security/keys/permission.c:55
 lookup_user_key+0x9ea/0xdf0 security/keys/process_keys.c:803
 keyctl_setperm_key security/keys/keyctl.c:1083 [inline]
 __do_sys_keyctl security/keys/keyctl.c:1926 [inline]
 __se_sys_keyctl+0x829/0xbb0 security/keys/keyctl.c:1874
 __x64_sys_keyctl+0x67/0x80 security/keys/keyctl.c:1874
 x64_sys_call+0x2bf5/0x2d70 arch/x86/include/generated/asm/syscalls_64.h:251
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x3d010000 -> 0x00000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19441 Comm: syz.1.4799 Tainted: G        W          6.10.0-rc6-syzkaller-00067-g8a9c6c40432e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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