| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-38596: af_unix: Fix data races in unix_release_sock/unix_stream_sendmsg |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| af_unix: Fix data races in unix_release_sock/unix_stream_sendmsg |
| |
| A data-race condition has been identified in af_unix. In one data path, |
| the write function unix_release_sock() atomically writes to |
| sk->sk_shutdown using WRITE_ONCE. However, on the reader side, |
| unix_stream_sendmsg() does not read it atomically. Consequently, this |
| issue is causing the following KCSAN splat to occur: |
| |
| BUG: KCSAN: data-race in unix_release_sock / unix_stream_sendmsg |
| |
| write (marked) to 0xffff88867256ddbb of 1 bytes by task 7270 on cpu 28: |
| unix_release_sock (net/unix/af_unix.c:640) |
| unix_release (net/unix/af_unix.c:1050) |
| sock_close (net/socket.c:659 net/socket.c:1421) |
| __fput (fs/file_table.c:422) |
| __fput_sync (fs/file_table.c:508) |
| __se_sys_close (fs/open.c:1559 fs/open.c:1541) |
| __x64_sys_close (fs/open.c:1541) |
| x64_sys_call (arch/x86/entry/syscall_64.c:33) |
| do_syscall_64 (arch/x86/entry/common.c:?) |
| entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) |
| |
| read to 0xffff88867256ddbb of 1 bytes by task 989 on cpu 14: |
| unix_stream_sendmsg (net/unix/af_unix.c:2273) |
| __sock_sendmsg (net/socket.c:730 net/socket.c:745) |
| ____sys_sendmsg (net/socket.c:2584) |
| __sys_sendmmsg (net/socket.c:2638 net/socket.c:2724) |
| __x64_sys_sendmmsg (net/socket.c:2753 net/socket.c:2750 net/socket.c:2750) |
| x64_sys_call (arch/x86/entry/syscall_64.c:33) |
| do_syscall_64 (arch/x86/entry/common.c:?) |
| entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) |
| |
| value changed: 0x01 -> 0x03 |
| |
| The line numbers are related to commit dd5a440a31fa ("Linux 6.9-rc7"). |
| |
| Commit e1d09c2c2f57 ("af_unix: Fix data races around sk->sk_shutdown.") |
| addressed a comparable issue in the past regarding sk->sk_shutdown. |
| However, it overlooked resolving this particular data path. |
| This patch only offending unix_stream_sendmsg() function, since the |
| other reads seem to be protected by unix_state_lock() as discussed in |
| |
| The Linux kernel CVE team has assigned CVE-2024-38596 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 4.19.316 with commit fca6072e1a7b1e709ada5604b951513b89b4bd0a |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.4.278 with commit de6641d213373fbde9bbdd7c4b552254bc9f82fe |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.10.219 with commit 4d51845d734a4c5d079e56e0916f936a55e15055 |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 5.15.161 with commit 9aa8773abfa0e954136875b4cbf2df4cf638e8a5 |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.1.93 with commit 8299e4d778f664b31b67cf4cf3d5409de2ecb92c |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.6.33 with commit 0688d4e499bee3f2749bca27329bd128686230cb |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.8.12 with commit a4c88072abcaca593cefe70f90e9d3707526e8f9 |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.9.3 with commit a52fa2addfcccc2c5a0217fd45562605088c018b |
| Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.10 with commit 540bf24fba16b88c1b3b9353927204b4f1074e25 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-38596 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| net/unix/af_unix.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/fca6072e1a7b1e709ada5604b951513b89b4bd0a |
| https://git.kernel.org/stable/c/de6641d213373fbde9bbdd7c4b552254bc9f82fe |
| https://git.kernel.org/stable/c/4d51845d734a4c5d079e56e0916f936a55e15055 |
| https://git.kernel.org/stable/c/9aa8773abfa0e954136875b4cbf2df4cf638e8a5 |
| https://git.kernel.org/stable/c/8299e4d778f664b31b67cf4cf3d5409de2ecb92c |
| https://git.kernel.org/stable/c/0688d4e499bee3f2749bca27329bd128686230cb |
| https://git.kernel.org/stable/c/a4c88072abcaca593cefe70f90e9d3707526e8f9 |
| https://git.kernel.org/stable/c/a52fa2addfcccc2c5a0217fd45562605088c018b |
| https://git.kernel.org/stable/c/540bf24fba16b88c1b3b9353927204b4f1074e25 |
