| 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-2024-47733: netfs: Delete subtree of 'fs/netfs' when netfs module exits |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| netfs: Delete subtree of 'fs/netfs' when netfs module exits |
| |
| In netfs_init() or fscache_proc_init(), we create dentry under 'fs/netfs', |
| but in netfs_exit(), we only delete the proc entry of 'fs/netfs' without |
| deleting its subtree. This triggers the following WARNING: |
| |
| ================================================================== |
| remove_proc_entry: removing non-empty directory 'fs/netfs', leaking at least 'requests' |
| WARNING: CPU: 4 PID: 566 at fs/proc/generic.c:717 remove_proc_entry+0x160/0x1c0 |
| Modules linked in: netfs(-) |
| CPU: 4 UID: 0 PID: 566 Comm: rmmod Not tainted 6.11.0-rc3 #860 |
| RIP: 0010:remove_proc_entry+0x160/0x1c0 |
| Call Trace: |
| <TASK> |
| netfs_exit+0x12/0x620 [netfs] |
| __do_sys_delete_module.isra.0+0x14c/0x2e0 |
| do_syscall_64+0x4b/0x110 |
| entry_SYSCALL_64_after_hwframe+0x76/0x7e |
| ================================================================== |
| |
| Therefore use remove_proc_subtree() instead of remove_proc_entry() to |
| fix the above problem. |
| |
| The Linux kernel CVE team has assigned CVE-2024-47733 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.8 with commit 7eb5b3e3a0a55f2d166ca949ef47ca6e0c704aab and fixed in 6.10.13 with commit 603f95cefbee06a31b03137b777f03e3c2163d72 |
| Issue introduced in 6.8 with commit 7eb5b3e3a0a55f2d166ca949ef47ca6e0c704aab and fixed in 6.11.2 with commit 7a9eaf97d56625e55b31a7beb558e1ee185ca461 |
| Issue introduced in 6.8 with commit 7eb5b3e3a0a55f2d166ca949ef47ca6e0c704aab and fixed in 6.12 with commit 3c58a9575e02c2b90a3180007d57105ceaa7c246 |
| |
| 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-2024-47733 |
| 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/netfs/main.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/603f95cefbee06a31b03137b777f03e3c2163d72 |
| https://git.kernel.org/stable/c/7a9eaf97d56625e55b31a7beb558e1ee185ca461 |
| https://git.kernel.org/stable/c/3c58a9575e02c2b90a3180007d57105ceaa7c246 |
