syzbot

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BUG: KCSAN: data-race in key_task_permission / keyctl_chown_key

write to 0xffff888104bc5f68 of 4 bytes by task 24768 on cpu 0:
 keyctl_chown_key+0x4f7/0x570 security/keys/keyctl.c:1035
 __do_sys_keyctl security/keys/keyctl.c:1916 [inline]
 __se_sys_keyctl+0x112/0xbb0 security/keys/keyctl.c:1869
 __x64_sys_keyctl+0x67/0x80 security/keys/keyctl.c:1869
 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 0xffff888104bc5f68 of 4 bytes by task 24767 on cpu 1:
 key_task_permission+0x11f/0x2b0 security/keys/permission.c:54
 keyring_search_iterator+0x10d/0x270 security/keys/keyring.c:616
 search_keyring security/keys/keyring.c:654 [inline]
 search_nested_keyrings+0x35f/0x9c0 security/keys/keyring.c:718
 keyring_search_rcu+0xf8/0x190 security/keys/keyring.c:922
 search_cred_keyrings_rcu+0x159/0x3b0 security/keys/process_keys.c:480
 search_process_keyrings_rcu security/keys/process_keys.c:544 [inline]
 lookup_user_key+0x80d/0xde0 security/keys/process_keys.c:762
 keyctl_chown_key+0x10b/0x570 security/keys/keyctl.c:970
 __do_sys_keyctl security/keys/keyctl.c:1916 [inline]
 __se_sys_keyctl+0x112/0xbb0 security/keys/keyctl.c:1869
 __x64_sys_keyctl+0x67/0x80 security/keys/keyctl.c:1869
 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 -> 0x0000ee00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 24767 Comm: syz-executor.0 Not tainted 6.4.0-syzkaller-10207-g99bdeae21d25 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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