| 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-2021-47297: net: fix uninit-value in caif_seqpkt_sendmsg |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: fix uninit-value in caif_seqpkt_sendmsg |
| |
| When nr_segs equal to zero in iovec_from_user, the object |
| msg->msg_iter.iov is uninit stack memory in caif_seqpkt_sendmsg |
| which is defined in ___sys_sendmsg. So we cann't just judge |
| msg->msg_iter.iov->base directlly. We can use nr_segs to judge |
| msg in caif_seqpkt_sendmsg whether has data buffers. |
| |
| ===================================================== |
| BUG: KMSAN: uninit-value in caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542 |
| Call Trace: |
| __dump_stack lib/dump_stack.c:77 [inline] |
| dump_stack+0x1c9/0x220 lib/dump_stack.c:118 |
| kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118 |
| __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 |
| caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542 |
| sock_sendmsg_nosec net/socket.c:652 [inline] |
| sock_sendmsg net/socket.c:672 [inline] |
| ____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343 |
| ___sys_sendmsg net/socket.c:2397 [inline] |
| __sys_sendmmsg+0x808/0xc90 net/socket.c:2480 |
| __compat_sys_sendmmsg net/compat.c:656 [inline] |
| |
| The Linux kernel CVE team has assigned CVE-2021-47297 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.35 with commit bece7b2398d073d11b2e352405a3ecd3a1e39c60 and fixed in 4.4.277 with commit d9d646acad2c3590e189bb5d5c86ab8bd8a2dfc3 |
| Issue introduced in 2.6.35 with commit bece7b2398d073d11b2e352405a3ecd3a1e39c60 and fixed in 4.9.277 with commit 5c6d8e2f7187b8e45a18c27acb7a3885f03ee3db |
| Issue introduced in 2.6.35 with commit bece7b2398d073d11b2e352405a3ecd3a1e39c60 and fixed in 4.14.241 with commit ffe31dd70b70a40cd6b21b78c1713a23e021843a |
| Issue introduced in 2.6.35 with commit bece7b2398d073d11b2e352405a3ecd3a1e39c60 and fixed in 4.19.199 with commit 452c3ed7bf63721b07bc2238ed1261bb26027e85 |
| Issue introduced in 2.6.35 with commit bece7b2398d073d11b2e352405a3ecd3a1e39c60 and fixed in 5.4.136 with commit 9413c0abb57f70a953b1116318d6aa478013c35d |
| Issue introduced in 2.6.35 with commit bece7b2398d073d11b2e352405a3ecd3a1e39c60 and fixed in 5.10.54 with commit 1582a02fecffcee306663035a295e28e1c4aaaff |
| Issue introduced in 2.6.35 with commit bece7b2398d073d11b2e352405a3ecd3a1e39c60 and fixed in 5.13.6 with commit d4c7797ab1517515f0d08b3bc1c6b48883889c54 |
| Issue introduced in 2.6.35 with commit bece7b2398d073d11b2e352405a3ecd3a1e39c60 and fixed in 5.14 with commit 991e634360f2622a683b48dfe44fe6d9cb765a09 |
| |
| 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-2021-47297 |
| 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/caif/caif_socket.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/d9d646acad2c3590e189bb5d5c86ab8bd8a2dfc3 |
| https://git.kernel.org/stable/c/5c6d8e2f7187b8e45a18c27acb7a3885f03ee3db |
| https://git.kernel.org/stable/c/ffe31dd70b70a40cd6b21b78c1713a23e021843a |
| https://git.kernel.org/stable/c/452c3ed7bf63721b07bc2238ed1261bb26027e85 |
| https://git.kernel.org/stable/c/9413c0abb57f70a953b1116318d6aa478013c35d |
| https://git.kernel.org/stable/c/1582a02fecffcee306663035a295e28e1c4aaaff |
| https://git.kernel.org/stable/c/d4c7797ab1517515f0d08b3bc1c6b48883889c54 |
| https://git.kernel.org/stable/c/991e634360f2622a683b48dfe44fe6d9cb765a09 |
