cve-2021-47335
Vulnerability from cvelistv5
Published
2024-05-21 14:35
Modified
2024-12-19 07:39
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances As syzbot reported, there is an use-after-free issue during f2fs recovery: Use-after-free write at 0xffff88823bc16040 (in kfence-#10): kmem_cache_destroy+0x1f/0x120 mm/slab_common.c:486 f2fs_recover_fsync_data+0x75b0/0x8380 fs/f2fs/recovery.c:869 f2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945 mount_bdev+0x26c/0x3a0 fs/super.c:1367 legacy_get_tree+0xea/0x180 fs/fs_context.c:592 vfs_get_tree+0x86/0x270 fs/super.c:1497 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x196f/0x2be0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae The root cause is multi f2fs filesystem instances can race on accessing global fsync_entry_slab pointer, result in use-after-free issue of slab cache, fixes to init/destroy this slab cache only once during module init/destroy procedure to avoid this issue.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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