lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-ID: <2024111937-CVE-2024-50278-d6c9@gregkh> Date: Tue, 19 Nov 2024 02:32:33 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-50278: dm cache: fix potential out-of-bounds access on the first resume Description =========== In the Linux kernel, the following vulnerability has been resolved: dm cache: fix potential out-of-bounds access on the first resume Out-of-bounds access occurs if the fast device is expanded unexpectedly before the first-time resume of the cache table. This happens because expanding the fast device requires reloading the cache table for cache_create to allocate new in-core data structures that fit the new size, and the check in cache_preresume is not performed during the first resume, leading to the issue. Reproduce steps: 1. prepare component devices: dmsetup create cmeta --table "0 8192 linear /dev/sdc 0" dmsetup create cdata --table "0 65536 linear /dev/sdc 8192" dmsetup create corig --table "0 524288 linear /dev/sdc 262144" dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct 2. load a cache table of 512 cache blocks, and deliberately expand the fast device before resuming the cache, making the in-core data structures inadequate. dmsetup create cache --notable dmsetup reload cache --table "0 524288 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0" dmsetup reload cdata --table "0 131072 linear /dev/sdc 8192" dmsetup resume cdata dmsetup resume cache 3. suspend the cache to write out the in-core dirty bitset and hint array, leading to out-of-bounds access to the dirty bitset at offset 0x40: dmsetup suspend cache KASAN reports: BUG: KASAN: vmalloc-out-of-bounds in is_dirty_callback+0x2b/0x80 Read of size 8 at addr ffffc90000085040 by task dmsetup/90 (...snip...) The buggy address belongs to the virtual mapping at [ffffc90000085000, ffffc90000087000) created by: cache_ctr+0x176a/0x35f0 (...snip...) Memory state around the buggy address: ffffc90000084f00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc90000084f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 >ffffc90000085000: 00 00 00 00 00 00 00 00 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc90000085080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc90000085100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 Fix by checking the size change on the first resume. The Linux kernel CVE team has assigned CVE-2024-50278 to this issue. Affected and fixed versions =========================== Issue introduced in 3.13 with commit f494a9c6b1b6 and fixed in 4.19.324 with commit e492f71854ce Issue introduced in 3.13 with commit f494a9c6b1b6 and fixed in 5.4.286 with commit 2222b0929d00 Issue introduced in 3.13 with commit f494a9c6b1b6 and fixed in 5.10.230 with commit 483b7261b35a Issue introduced in 3.13 with commit f494a9c6b1b6 and fixed in 5.15.172 with commit fdef3b94dfeb Issue introduced in 3.13 with commit f494a9c6b1b6 and fixed in 6.1.117 with commit c52ec00cb2f9 Issue introduced in 3.13 with commit f494a9c6b1b6 and fixed in 6.6.61 with commit 036dd6e3d263 Issue introduced in 3.13 with commit f494a9c6b1b6 and fixed in 6.11.8 with commit 13ed3624c6ef Issue introduced in 3.13 with commit f494a9c6b1b6 and fixed in 6.12 with commit c0ade5d98979 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-2024-50278 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: drivers/md/dm-cache-target.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/e492f71854ce03474d49e87fd98b8df1f7cd1d2d https://git.kernel.org/stable/c/2222b0929d00e2d13732b799b63be391b5de4492 https://git.kernel.org/stable/c/483b7261b35a9d369082ab298a6670912243f0be https://git.kernel.org/stable/c/fdef3b94dfebd57e3077a578b6e309a2bb6fa688 https://git.kernel.org/stable/c/c52ec00cb2f9bebfada22edcc0db385b910a1cdb https://git.kernel.org/stable/c/036dd6e3d2638103e0092864577ea1d091466b86 https://git.kernel.org/stable/c/13ed3624c6ef283acefa4cc42cc8ae54fd4391a4 https://git.kernel.org/stable/c/c0ade5d98979585d4f5a93e4514c2e9a65afa08d
Powered by blists - more mailing lists