| 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-2022-49732: sock: redo the psock vs ULP protection check |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| sock: redo the psock vs ULP protection check |
| |
| Commit 8a59f9d1e3d4 ("sock: Introduce sk->sk_prot->psock_update_sk_prot()") |
| has moved the inet_csk_has_ulp(sk) check from sk_psock_init() to |
| the new tcp_bpf_update_proto() function. I'm guessing that this |
| was done to allow creating psocks for non-inet sockets. |
| |
| Unfortunately the destruction path for psock includes the ULP |
| unwind, so we need to fail the sk_psock_init() itself. |
| Otherwise if ULP is already present we'll notice that later, |
| and call tcp_update_ulp() with the sk_proto of the ULP |
| itself, which will most likely result in the ULP looping |
| its callbacks. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49732 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.13 with commit 8a59f9d1e3d4340659fdfee8879dc09a6f2546e1 and fixed in 5.15.51 with commit 72fa0f65b56605b8a9ae9fba2082f2123f7fe017 |
| Issue introduced in 5.13 with commit 8a59f9d1e3d4340659fdfee8879dc09a6f2546e1 and fixed in 5.18.8 with commit 922309e50befb0cfa5cb65e4989b7706d6578846 |
| Issue introduced in 5.13 with commit 8a59f9d1e3d4340659fdfee8879dc09a6f2546e1 and fixed in 5.19 with commit e34a07c0ae3906f97eb18df50902e2a01c1015b6 |
| |
| 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-2022-49732 |
| 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: |
| include/net/inet_sock.h |
| net/core/skmsg.c |
| net/ipv4/tcp_bpf.c |
| net/tls/tls_main.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/72fa0f65b56605b8a9ae9fba2082f2123f7fe017 |
| https://git.kernel.org/stable/c/922309e50befb0cfa5cb65e4989b7706d6578846 |
| https://git.kernel.org/stable/c/e34a07c0ae3906f97eb18df50902e2a01c1015b6 |
