| 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-2024-53235: erofs: fix file-backed mounts over FUSE |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| erofs: fix file-backed mounts over FUSE |
| |
| syzbot reported a null-ptr-deref in fuse_read_args_fill: |
| fuse_read_folio+0xb0/0x100 fs/fuse/file.c:905 |
| filemap_read_folio+0xc6/0x2a0 mm/filemap.c:2367 |
| do_read_cache_folio+0x263/0x5c0 mm/filemap.c:3825 |
| read_mapping_folio include/linux/pagemap.h:1011 [inline] |
| erofs_bread+0x34d/0x7e0 fs/erofs/data.c:41 |
| erofs_read_superblock fs/erofs/super.c:281 [inline] |
| erofs_fc_fill_super+0x2b9/0x2500 fs/erofs/super.c:625 |
| |
| Unlike most filesystems, some network filesystems and FUSE need |
| unavoidable valid `file` pointers for their read I/Os [1]. |
| Anyway, those use cases need to be supported too. |
| |
| [1] https://docs.kernel.org/filesystems/vfs.html |
| |
| The Linux kernel CVE team has assigned CVE-2024-53235 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.12 with commit fb176750266a3d7f42ebdcf28e8ba40350b27847 and fixed in 6.12.2 with commit 5036f2f024cac40a02ea6ea70de2c3a4407d16bc |
| Issue introduced in 6.12 with commit fb176750266a3d7f42ebdcf28e8ba40350b27847 and fixed in 6.13 with commit 3a23787ca8756920d65fda39f41353a4be1d1642 |
| |
| 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-2024-53235 |
| 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/erofs/data.c |
| fs/erofs/internal.h |
| |
| |
| 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/5036f2f024cac40a02ea6ea70de2c3a4407d16bc |
| https://git.kernel.org/stable/c/3a23787ca8756920d65fda39f41353a4be1d1642 |
