CVE-2023-54006

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> af_unix: Fix data-race around unix_tot_inflight.<br /> <br /> unix_tot_inflight is changed under spin_lock(unix_gc_lock), but<br /> unix_release_sock() reads it locklessly.<br /> <br /> Let&amp;#39;s use READ_ONCE() for unix_tot_inflight.<br /> <br /> Note that the writer side was marked by commit 9d6d7f1cb67c ("af_unix:<br /> annote lockless accesses to unix_tot_inflight &amp; gc_in_progress")<br /> <br /> BUG: KCSAN: data-race in unix_inflight / unix_release_sock<br /> <br /> write (marked) to 0xffffffff871852b8 of 4 bytes by task 123 on cpu 1:<br /> unix_inflight+0x130/0x180 net/unix/scm.c:64<br /> unix_attach_fds+0x137/0x1b0 net/unix/scm.c:123<br /> unix_scm_to_skb net/unix/af_unix.c:1832 [inline]<br /> unix_dgram_sendmsg+0x46a/0x14f0 net/unix/af_unix.c:1955<br /> sock_sendmsg_nosec net/socket.c:724 [inline]<br /> sock_sendmsg+0x148/0x160 net/socket.c:747<br /> ____sys_sendmsg+0x4e4/0x610 net/socket.c:2493<br /> ___sys_sendmsg+0xc6/0x140 net/socket.c:2547<br /> __sys_sendmsg+0x94/0x140 net/socket.c:2576<br /> __do_sys_sendmsg net/socket.c:2585 [inline]<br /> __se_sys_sendmsg net/socket.c:2583 [inline]<br /> __x64_sys_sendmsg+0x45/0x50 net/socket.c:2583<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 /> read to 0xffffffff871852b8 of 4 bytes by task 4891 on cpu 0:<br /> unix_release_sock+0x608/0x910 net/unix/af_unix.c:671<br /> unix_release+0x59/0x80 net/unix/af_unix.c:1058<br /> __sock_release+0x7d/0x170 net/socket.c:653<br /> sock_close+0x19/0x30 net/socket.c:1385<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 /> value changed: 0x00000000 -&gt; 0x00000001<br /> <br /> Reported by Kernel Concurrency Sanitizer on:<br /> CPU: 0 PID: 4891 Comm: systemd-coredum Not tainted 6.4.0-rc5-01219-gfa0e21fa4443 #5<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014