| 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-2024-56619: nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| nilfs2: fix potential out-of-bounds memory access in nilfs_find_entry() |
| |
| Syzbot reported that when searching for records in a directory where the |
| inode's i_size is corrupted and has a large value, memory access outside |
| the folio/page range may occur, or a use-after-free bug may be detected if |
| KASAN is enabled. |
| |
| This is because nilfs_last_byte(), which is called by nilfs_find_entry() |
| and others to calculate the number of valid bytes of directory data in a |
| page from i_size and the page index, loses the upper 32 bits of the 64-bit |
| size information due to an inappropriate type of local variable to which |
| the i_size value is assigned. |
| |
| This caused a large byte offset value due to underflow in the end address |
| calculation in the calling nilfs_find_entry(), resulting in memory access |
| that exceeds the folio/page size. |
| |
| Fix this issue by changing the type of the local variable causing the bit |
| loss from "unsigned int" to "u64". The return value of nilfs_last_byte() |
| is also of type "unsigned int", but it is truncated so as not to exceed |
| PAGE_SIZE and no bit loss occurs, so no change is required. |
| |
| The Linux kernel CVE team has assigned CVE-2024-56619 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.30 with commit 2ba466d74ed74f073257f86e61519cb8f8f46184 and fixed in 5.4.287 with commit 09d6d05579fd46e61abf6e457bb100ff11f3a9d3 |
| Issue introduced in 2.6.30 with commit 2ba466d74ed74f073257f86e61519cb8f8f46184 and fixed in 5.10.231 with commit e3732102a9d638d8627d14fdf7b208462f0520e0 |
| Issue introduced in 2.6.30 with commit 2ba466d74ed74f073257f86e61519cb8f8f46184 and fixed in 5.15.174 with commit 48eb6e7404948032bbe811c5affbe39f6b316951 |
| Issue introduced in 2.6.30 with commit 2ba466d74ed74f073257f86e61519cb8f8f46184 and fixed in 6.1.120 with commit 5af8366625182f01f6d8465c9a3210574673af57 |
| Issue introduced in 2.6.30 with commit 2ba466d74ed74f073257f86e61519cb8f8f46184 and fixed in 6.6.66 with commit c3afea07477baccdbdec4483f8d5e59d42a3f67f |
| Issue introduced in 2.6.30 with commit 2ba466d74ed74f073257f86e61519cb8f8f46184 and fixed in 6.12.5 with commit 31f7b57a77d4c82a34ddcb6ff35b5aa577ef153e |
| Issue introduced in 2.6.30 with commit 2ba466d74ed74f073257f86e61519cb8f8f46184 and fixed in 6.13 with commit 985ebec4ab0a28bb5910c3b1481a40fbf7f9e61d |
| |
| 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-2024-56619 |
| 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/nilfs2/dir.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/09d6d05579fd46e61abf6e457bb100ff11f3a9d3 |
| https://git.kernel.org/stable/c/e3732102a9d638d8627d14fdf7b208462f0520e0 |
| https://git.kernel.org/stable/c/48eb6e7404948032bbe811c5affbe39f6b316951 |
| https://git.kernel.org/stable/c/5af8366625182f01f6d8465c9a3210574673af57 |
| https://git.kernel.org/stable/c/c3afea07477baccdbdec4483f8d5e59d42a3f67f |
| https://git.kernel.org/stable/c/31f7b57a77d4c82a34ddcb6ff35b5aa577ef153e |
| https://git.kernel.org/stable/c/985ebec4ab0a28bb5910c3b1481a40fbf7f9e61d |
