syzbot

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BUG: KCSAN: data-race in selinux_cred_prepare / selinux_inode_permission

write to 0xffff888101fb35a0 of 4 bytes by task 19474 on cpu 0:
 task_avdcache_search security/selinux/hooks.c:3146 [inline]
 selinux_inode_permission+0x31b/0x620 security/selinux/hooks.c:3216
 security_inode_permission+0x6d/0xb0 security/security.c:2324
 inode_permission+0x106/0x310 fs/namei.c:601
 may_open+0x255/0x350 fs/namei.c:3486
 do_open fs/namei.c:3894 [inline]
 path_openat+0x1b4a/0x2170 fs/namei.c:4055
 do_filp_open+0x109/0x230 fs/namei.c:4082
 io_openat2+0x272/0x390 io_uring/openclose.c:142
 io_openat+0x1b/0x30 io_uring/openclose.c:179
 __io_issue_sqe+0xfe/0x2e0 io_uring/io_uring.c:1738
 io_issue_sqe+0x53/0x970 io_uring/io_uring.c:1761
 io_queue_sqe io_uring/io_uring.c:1968 [inline]
 io_submit_sqe io_uring/io_uring.c:2224 [inline]
 io_submit_sqes+0x667/0xfd0 io_uring/io_uring.c:2337
 __do_sys_io_uring_enter io_uring/io_uring.c:3404 [inline]
 __se_sys_io_uring_enter+0x1c1/0x1b70 io_uring/io_uring.c:3338
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3338
 x64_sys_call+0x28c8/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888101fb3580 of 100 bytes by task 19482 on cpu 1:
 selinux_cred_prepare+0x60/0x70 security/selinux/hooks.c:4139
 security_prepare_creds+0xbb/0x120 security/security.c:3246
 prepare_creds+0x34a/0x4c0 kernel/cred.c:242
 install_thread_keyring security/keys/process_keys.c:249 [inline]
 lookup_user_key+0x12a/0xd10 security/keys/process_keys.c:635
 __do_sys_add_key security/keys/keyctl.c:126 [inline]
 __se_sys_add_key+0x263/0x350 security/keys/keyctl.c:74
 __x64_sys_add_key+0x67/0x80 security/keys/keyctl.c:74
 x64_sys_call+0x1d0d/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:249
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 19482 Comm: syz.7.5661 Not tainted 6.16.0-rc3-syzkaller-00072-gee88bddf7f2f #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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