| From bippy-7c5fe7eed585 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-2022-48939: bpf: Add schedule points in batch ops |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| bpf: Add schedule points in batch ops |
| |
| syzbot reported various soft lockups caused by bpf batch operations. |
| |
| INFO: task kworker/1:1:27 blocked for more than 140 seconds. |
| INFO: task hung in rcu_barrier |
| |
| Nothing prevents batch ops to process huge amount of data, |
| we need to add schedule points in them. |
| |
| Note that maybe_wait_bpf_programs(map) calls from |
| generic_map_delete_batch() can be factorized by moving |
| the call after the loop. |
| |
| This will be done later in -next tree once we get this fix merged, |
| unless there is strong opinion doing this optimization sooner. |
| |
| The Linux kernel CVE team has assigned CVE-2022-48939 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.6 with commit cb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 and fixed in 5.10.103 with commit 7ef94bfb08fb9e73defafbd5ddef6b5a0e2ee12b |
| Issue introduced in 5.6 with commit cb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 and fixed in 5.15.26 with commit 8628f489b749a4f9767991631921dbe3fbcdc784 |
| Issue introduced in 5.6 with commit cb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 and fixed in 5.16.12 with commit 7e8099967d0e3ff9d1ae043e80b27fbe46c08417 |
| Issue introduced in 5.6 with commit cb4d03ab499d4c040f4ab6fd4389d2b49f42b5a5 and fixed in 5.17 with commit 75134f16e7dd0007aa474b281935c5f42e79f2c8 |
| |
| 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-2022-48939 |
| 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: |
| kernel/bpf/syscall.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/7ef94bfb08fb9e73defafbd5ddef6b5a0e2ee12b |
| https://git.kernel.org/stable/c/8628f489b749a4f9767991631921dbe3fbcdc784 |
| https://git.kernel.org/stable/c/7e8099967d0e3ff9d1ae043e80b27fbe46c08417 |
| https://git.kernel.org/stable/c/75134f16e7dd0007aa474b281935c5f42e79f2c8 |
