| 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-2024-26883: bpf: Fix stackmap overflow check on 32-bit arches |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| bpf: Fix stackmap overflow check on 32-bit arches |
| |
| The stackmap code relies on roundup_pow_of_two() to compute the number |
| of hash buckets, and contains an overflow check by checking if the |
| resulting value is 0. However, on 32-bit arches, the roundup code itself |
| can overflow by doing a 32-bit left-shift of an unsigned long value, |
| which is undefined behaviour, so it is not guaranteed to truncate |
| neatly. This was triggered by syzbot on the DEVMAP_HASH type, which |
| contains the same check, copied from the hashtab code. |
| |
| The commit in the fixes tag actually attempted to fix this, but the fix |
| did not account for the UB, so the fix only works on CPUs where an |
| overflow does result in a neat truncation to zero, which is not |
| guaranteed. Checking the value before rounding does not have this |
| problem. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26883 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.19.177 with commit 063c722dd9d285d877e6fd499e753d6224f4c046 and fixed in 4.19.311 with commit d0e214acc59145ce25113f617311aa79dda39cb3 |
| Issue introduced in 5.4.99 with commit 7e3a6b820535eb395784060ae26c5af579528fa0 and fixed in 5.4.273 with commit 21e5fa4688e1a4d3db6b72216231b24232f75c1d |
| Issue introduced in 5.10.17 with commit 8032bf2af9ce26b3a362b9711d15f626ab946a74 and fixed in 5.10.214 with commit 15641007df0f0d35fa28742b25c2a7db9dcd6895 |
| Issue introduced in 5.11 with commit 6183f4d3a0a2ad230511987c6c362ca43ec0055f and fixed in 5.15.153 with commit ca1f06e72dec41ae4f76e7b1a8a97265447b46ae |
| Issue introduced in 5.11 with commit 6183f4d3a0a2ad230511987c6c362ca43ec0055f and fixed in 6.1.83 with commit f06899582ccee09bd85d0696290e3eaca9aa042d |
| Issue introduced in 5.11 with commit 6183f4d3a0a2ad230511987c6c362ca43ec0055f and fixed in 6.6.23 with commit 7070b274c7866a4c5036f8d54fcaf315c64ac33a |
| Issue introduced in 5.11 with commit 6183f4d3a0a2ad230511987c6c362ca43ec0055f and fixed in 6.7.11 with commit 43f798b9036491fb014b55dd61c4c5c3193267d0 |
| Issue introduced in 5.11 with commit 6183f4d3a0a2ad230511987c6c362ca43ec0055f and fixed in 6.8.2 with commit 0971126c8164abe2004b8536b49690a0d6005b0a |
| Issue introduced in 5.11 with commit 6183f4d3a0a2ad230511987c6c362ca43ec0055f and fixed in 6.9 with commit 7a4b21250bf79eef26543d35bd390448646c536b |
| Issue introduced in 4.9.258 with commit 253150830a012adfccf90afcebae8fda5b05a80f |
| Issue introduced in 4.14.222 with commit 766107351731ae223ebf60ca22bdfeb47ce6acc8 |
| |
| 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-2024-26883 |
| 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/stackmap.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/d0e214acc59145ce25113f617311aa79dda39cb3 |
| https://git.kernel.org/stable/c/21e5fa4688e1a4d3db6b72216231b24232f75c1d |
| https://git.kernel.org/stable/c/15641007df0f0d35fa28742b25c2a7db9dcd6895 |
| https://git.kernel.org/stable/c/ca1f06e72dec41ae4f76e7b1a8a97265447b46ae |
| https://git.kernel.org/stable/c/f06899582ccee09bd85d0696290e3eaca9aa042d |
| https://git.kernel.org/stable/c/7070b274c7866a4c5036f8d54fcaf315c64ac33a |
| https://git.kernel.org/stable/c/43f798b9036491fb014b55dd61c4c5c3193267d0 |
| https://git.kernel.org/stable/c/0971126c8164abe2004b8536b49690a0d6005b0a |
| https://git.kernel.org/stable/c/7a4b21250bf79eef26543d35bd390448646c536b |
