| From bippy-1.1.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49849: btrfs: fix match incorrectly in dev_args_match_device |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| btrfs: fix match incorrectly in dev_args_match_device |
| |
| syzkaller found a failed assertion: |
| |
| assertion failed: (args->devid != (u64)-1) || args->missing, in fs/btrfs/volumes.c:6921 |
| |
| This can be triggered when we set devid to (u64)-1 by ioctl. In this |
| case, the match of devid will be skipped and the match of device may |
| succeed incorrectly. |
| |
| Patch 562d7b1512f7 introduced this function which is used to match device. |
| This function contains two matching scenarios, we can distinguish them by |
| checking the value of args->missing rather than check whether args->devid |
| and args->uuid is default value. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49849 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15.54 with commit 5578b681fbf2b22d61189a2539efd3009518b328 and fixed in 5.15.79 with commit c9fe4719c662e0af17eea723cf345e37719fd3c9 |
| Issue introduced in 5.16 with commit 562d7b1512f7369a19bca2883e2e8672d78f0481 and fixed in 6.0.9 with commit bc6c127c377010f136360552ebf91c2723081c1b |
| Issue introduced in 5.16 with commit 562d7b1512f7369a19bca2883e2e8672d78f0481 and fixed in 6.1 with commit 0fca385d6ebc3cabb20f67bcf8a71f1448bdc001 |
| |
| 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-2022-49849 |
| 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: |
| fs/btrfs/volumes.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/c9fe4719c662e0af17eea723cf345e37719fd3c9 |
| https://git.kernel.org/stable/c/bc6c127c377010f136360552ebf91c2723081c1b |
| https://git.kernel.org/stable/c/0fca385d6ebc3cabb20f67bcf8a71f1448bdc001 |
