CVE-2023-53204

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> af_unix: Fix data-races around user-&gt;unix_inflight.<br /> <br /> user-&gt;unix_inflight is changed under spin_lock(unix_gc_lock),<br /> but too_many_unix_fds() reads it locklessly.<br /> <br /> Let&amp;#39;s annotate the write/read accesses to user-&gt;unix_inflight.<br /> <br /> BUG: KCSAN: data-race in unix_attach_fds / unix_inflight<br /> <br /> write to 0xffffffff8546f2d0 of 8 bytes by task 44798 on cpu 1:<br /> unix_inflight+0x157/0x180 net/unix/scm.c:66<br /> unix_attach_fds+0x147/0x1e0 net/unix/scm.c:123<br /> unix_scm_to_skb net/unix/af_unix.c:1827 [inline]<br /> unix_dgram_sendmsg+0x46a/0x14f0 net/unix/af_unix.c:1950<br /> unix_seqpacket_sendmsg net/unix/af_unix.c:2308 [inline]<br /> unix_seqpacket_sendmsg+0xba/0x130 net/unix/af_unix.c:2292<br /> sock_sendmsg_nosec net/socket.c:725 [inline]<br /> sock_sendmsg+0x148/0x160 net/socket.c:748<br /> ____sys_sendmsg+0x4e4/0x610 net/socket.c:2494<br /> ___sys_sendmsg+0xc6/0x140 net/socket.c:2548<br /> __sys_sendmsg+0x94/0x140 net/socket.c:2577<br /> __do_sys_sendmsg net/socket.c:2586 [inline]<br /> __se_sys_sendmsg net/socket.c:2584 [inline]<br /> __x64_sys_sendmsg+0x45/0x50 net/socket.c:2584<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+0x6e/0xd8<br /> <br /> read to 0xffffffff8546f2d0 of 8 bytes by task 44814 on cpu 0:<br /> too_many_unix_fds net/unix/scm.c:101 [inline]<br /> unix_attach_fds+0x54/0x1e0 net/unix/scm.c:110<br /> unix_scm_to_skb net/unix/af_unix.c:1827 [inline]<br /> unix_dgram_sendmsg+0x46a/0x14f0 net/unix/af_unix.c:1950<br /> unix_seqpacket_sendmsg net/unix/af_unix.c:2308 [inline]<br /> unix_seqpacket_sendmsg+0xba/0x130 net/unix/af_unix.c:2292<br /> sock_sendmsg_nosec net/socket.c:725 [inline]<br /> sock_sendmsg+0x148/0x160 net/socket.c:748<br /> ____sys_sendmsg+0x4e4/0x610 net/socket.c:2494<br /> ___sys_sendmsg+0xc6/0x140 net/socket.c:2548<br /> __sys_sendmsg+0x94/0x140 net/socket.c:2577<br /> __do_sys_sendmsg net/socket.c:2586 [inline]<br /> __se_sys_sendmsg net/socket.c:2584 [inline]<br /> __x64_sys_sendmsg+0x45/0x50 net/socket.c:2584<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+0x6e/0xd8<br /> <br /> value changed: 0x000000000000000c -&gt; 0x000000000000000d<br /> <br /> Reported by Kernel Concurrency Sanitizer on:<br /> CPU: 0 PID: 44814 Comm: systemd-coredum Not tainted 6.4.0-11989-g6843306689af #6<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014