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: <2025070424-CVE-2025-38218-a5e8@gregkh> Date: Fri, 4 Jul 2025 15:37:47 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-38218: f2fs: fix to do sanity check on sit_bitmap_size From: Greg Kroah-Hartman <gregkh@...nel.org> Description =========== In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to do sanity check on sit_bitmap_size w/ below testcase, resize will generate a corrupted image which contains inconsistent metadata, so when mounting such image, it will trigger kernel panic: touch img truncate -s $((512*1024*1024*1024)) img mkfs.f2fs -f img $((256*1024*1024)) resize.f2fs -s -i img -t $((1024*1024*1024)) mount img /mnt/f2fs ------------[ cut here ]------------ kernel BUG at fs/f2fs/segment.h:863! Oops: invalid opcode: 0000 [#1] SMP PTI CPU: 11 UID: 0 PID: 3922 Comm: mount Not tainted 6.15.0-rc1+ #191 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:f2fs_ra_meta_pages+0x47c/0x490 Call Trace: f2fs_build_segment_manager+0x11c3/0x2600 f2fs_fill_super+0xe97/0x2840 mount_bdev+0xf4/0x140 legacy_get_tree+0x2b/0x50 vfs_get_tree+0x29/0xd0 path_mount+0x487/0xaf0 __x64_sys_mount+0x116/0x150 do_syscall_64+0x82/0x190 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fdbfde1bcfe The reaseon is: sit_i->bitmap_size is 192, so size of sit bitmap is 192*8=1536, at maximum there are 1536 sit blocks, however MAIN_SEGS is 261893, so that sit_blk_cnt is 4762, build_sit_entries() -> current_sit_addr() tries to access out-of-boundary in sit_bitmap at offset from [1536, 4762), once sit_bitmap and sit_bitmap_mirror is not the same, it will trigger f2fs_bug_on(). Let's add sanity check in f2fs_sanity_check_ckpt() to avoid panic. The Linux kernel CVE team has assigned CVE-2025-38218 to this issue. Affected and fixed versions =========================== Fixed in 5.10.239 with commit 82f51bff393e4c12cf4de553120ca831cfa4ef19 Fixed in 5.15.186 with commit 38ef48a8afef8df646b6f6ae7abb872f18b533c1 Fixed in 6.1.142 with commit ad862f71016ba38039df1c96ed55c0a4314cc183 Fixed in 6.6.95 with commit 79ef8a6c4ec53d327580fd7d2b522cf4f1d05b0c Fixed in 6.12.35 with commit ee1b421c469876544e297ec1090574bd76100247 Fixed in 6.15.4 with commit 3e5ac62a56a24f4d88ce8ffd7bc452428b235868 Fixed in 6.16-rc1 with commit 5db0d252c64e91ba1929c70112352e85dc5751e7 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-2025-38218 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/f2fs/super.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/82f51bff393e4c12cf4de553120ca831cfa4ef19 https://git.kernel.org/stable/c/38ef48a8afef8df646b6f6ae7abb872f18b533c1 https://git.kernel.org/stable/c/ad862f71016ba38039df1c96ed55c0a4314cc183 https://git.kernel.org/stable/c/79ef8a6c4ec53d327580fd7d2b522cf4f1d05b0c https://git.kernel.org/stable/c/ee1b421c469876544e297ec1090574bd76100247 https://git.kernel.org/stable/c/3e5ac62a56a24f4d88ce8ffd7bc452428b235868 https://git.kernel.org/stable/c/5db0d252c64e91ba1929c70112352e85dc5751e7
Powered by blists - more mailing lists