| 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-2024-27389: pstore: inode: Only d_invalidate() is needed |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| pstore: inode: Only d_invalidate() is needed |
| |
| Unloading a modular pstore backend with records in pstorefs would |
| trigger the dput() double-drop warning: |
| |
| WARNING: CPU: 0 PID: 2569 at fs/dcache.c:762 dput.part.0+0x3f3/0x410 |
| |
| Using the combo of d_drop()/dput() (as mentioned in |
| Documentation/filesystems/vfs.rst) isn't the right approach here, and |
| leads to the reference counting problem seen above. Use d_invalidate() |
| and update the code to not bother checking for error codes that can |
| never happen. |
| |
| --- |
| |
| The Linux kernel CVE team has assigned CVE-2024-27389 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.8 with commit 609e28bb139e53621521130f0d4aea27a725d465 and fixed in 6.1.83 with commit db6e5e16f1ee9e3b01d2f71c7f0ba945f4bf0f4e |
| Issue introduced in 5.8 with commit 609e28bb139e53621521130f0d4aea27a725d465 and fixed in 6.6.23 with commit 4cdf9006fc095af71da80e9b5f48a32e991b9ed3 |
| Issue introduced in 5.8 with commit 609e28bb139e53621521130f0d4aea27a725d465 and fixed in 6.7.11 with commit cb9e802e49c24eeb3af35e9e8c04d526f35f112a |
| Issue introduced in 5.8 with commit 609e28bb139e53621521130f0d4aea27a725d465 and fixed in 6.8.2 with commit 340682ed1932b8e3bd0bfc6c31a0c6354eb57cc6 |
| Issue introduced in 5.8 with commit 609e28bb139e53621521130f0d4aea27a725d465 and fixed in 6.9 with commit a43e0fc5e9134a46515de2f2f8d4100b74e50de3 |
| |
| 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-2024-27389 |
| 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/pstore/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/db6e5e16f1ee9e3b01d2f71c7f0ba945f4bf0f4e |
| https://git.kernel.org/stable/c/4cdf9006fc095af71da80e9b5f48a32e991b9ed3 |
| https://git.kernel.org/stable/c/cb9e802e49c24eeb3af35e9e8c04d526f35f112a |
| https://git.kernel.org/stable/c/340682ed1932b8e3bd0bfc6c31a0c6354eb57cc6 |
| https://git.kernel.org/stable/c/a43e0fc5e9134a46515de2f2f8d4100b74e50de3 |
