| From bippy-1.2.0 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-2023-52569: btrfs: remove BUG() after failure to insert delayed dir index item |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| btrfs: remove BUG() after failure to insert delayed dir index item |
| |
| Instead of calling BUG() when we fail to insert a delayed dir index item |
| into the delayed node's tree, we can just release all the resources we |
| have allocated/acquired before and return the error to the caller. This is |
| fine because all existing call chains undo anything they have done before |
| calling btrfs_insert_delayed_dir_index() or BUG_ON (when creating pending |
| snapshots in the transaction commit path). |
| |
| So remove the BUG() call and do proper error handling. |
| |
| This relates to a syzbot report linked below, but does not fix it because |
| it only prevents hitting a BUG(), it does not fix the issue where somehow |
| we attempt to use twice the same index number for different index items. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52569 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.1.76 with commit 2aa515b5b5011a7e7182af7eda89fb3bf5995c65 and fixed in 6.1.56 with commit 39c4a9522db0072570d602e9b365119e17fb9f4f |
| Issue introduced in 6.5 with commit 9b378f6ad48cfa195ed868db9123c09ee7ec5ea2 and fixed in 6.5.6 with commit d10fd53393cc5de4b9cf1a4b8f9984f0a037aa51 |
| Issue introduced in 6.5 with commit 9b378f6ad48cfa195ed868db9123c09ee7ec5ea2 and fixed in 6.6 with commit 2c58c3931ede7cd08cbecf1f1a4acaf0a04a41a9 |
| Issue introduced in 5.15.149 with commit 79cf35e16dd5b8639909d4df957503b84de30406 |
| Issue introduced in 6.4.12 with commit 5441532ffc9c8c9f7cab0f8722e6d60a0b5e1259 |
| |
| 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-2023-52569 |
| 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/delayed-inode.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/39c4a9522db0072570d602e9b365119e17fb9f4f |
| https://git.kernel.org/stable/c/d10fd53393cc5de4b9cf1a4b8f9984f0a037aa51 |
| https://git.kernel.org/stable/c/2c58c3931ede7cd08cbecf1f1a4acaf0a04a41a9 |
