CVE-2023-54226

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> af_unix: Fix data races around sk-&gt;sk_shutdown.<br /> <br /> KCSAN found a data race around sk-&gt;sk_shutdown where unix_release_sock()<br /> and unix_shutdown() update it under unix_state_lock(), OTOH unix_poll()<br /> and unix_dgram_poll() read it locklessly.<br /> <br /> We need to annotate the writes and reads with WRITE_ONCE() and READ_ONCE().<br /> <br /> BUG: KCSAN: data-race in unix_poll / unix_release_sock<br /> <br /> write to 0xffff88800d0f8aec of 1 bytes by task 264 on cpu 0:<br /> unix_release_sock+0x75c/0x910 net/unix/af_unix.c:631<br /> unix_release+0x59/0x80 net/unix/af_unix.c:1042<br /> __sock_release+0x7d/0x170 net/socket.c:653<br /> sock_close+0x19/0x30 net/socket.c:1397<br /> __fput+0x179/0x5e0 fs/file_table.c:321<br /> ____fput+0x15/0x20 fs/file_table.c:349<br /> task_work_run+0x116/0x1a0 kernel/task_work.c:179<br /> resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]<br /> exit_to_user_mode_loop kernel/entry/common.c:171 [inline]<br /> exit_to_user_mode_prepare+0x174/0x180 kernel/entry/common.c:204<br /> __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]<br /> syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:297<br /> do_syscall_64+0x4b/0x90 arch/x86/entry/common.c:86<br /> entry_SYSCALL_64_after_hwframe+0x72/0xdc<br /> <br /> read to 0xffff88800d0f8aec of 1 bytes by task 222 on cpu 1:<br /> unix_poll+0xa3/0x2a0 net/unix/af_unix.c:3170<br /> sock_poll+0xcf/0x2b0 net/socket.c:1385<br /> vfs_poll include/linux/poll.h:88 [inline]<br /> ep_item_poll.isra.0+0x78/0xc0 fs/eventpoll.c:855<br /> ep_send_events fs/eventpoll.c:1694 [inline]<br /> ep_poll fs/eventpoll.c:1823 [inline]<br /> do_epoll_wait+0x6c4/0xea0 fs/eventpoll.c:2258<br /> __do_sys_epoll_wait fs/eventpoll.c:2270 [inline]<br /> __se_sys_epoll_wait fs/eventpoll.c:2265 [inline]<br /> __x64_sys_epoll_wait+0xcc/0x190 fs/eventpoll.c:2265<br /> do_syscall_x64 arch/x86/entry/common.c:50 [inline]<br /> do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80<br /> entry_SYSCALL_64_after_hwframe+0x72/0xdc<br /> <br /> value changed: 0x00 -&gt; 0x03<br /> <br /> Reported by Kernel Concurrency Sanitizer on:<br /> CPU: 1 PID: 222 Comm: dbus-broker Not tainted 6.3.0-rc7-02330-gca6270c12e20 #2<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014