cve-2021-47335
Vulnerability from cvelistv5
Published
2024-05-21 14:35
Modified
2024-08-04 05:32
Severity
Summary
f2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances
References
SourceURLTags
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
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances\n\nAs syzbot reported, there is an use-after-free issue during f2fs recovery:\n\nUse-after-free write at 0xffff88823bc16040 (in kfence-#10):\n kmem_cache_destroy+0x1f/0x120 mm/slab_common.c:486\n f2fs_recover_fsync_data+0x75b0/0x8380 fs/f2fs/recovery.c:869\n f2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945\n mount_bdev+0x26c/0x3a0 fs/super.c:1367\n legacy_get_tree+0xea/0x180 fs/fs_context.c:592\n vfs_get_tree+0x86/0x270 fs/super.c:1497\n do_new_mount fs/namespace.c:2905 [inline]\n path_mount+0x196f/0x2be0 fs/namespace.c:3235\n do_mount fs/namespace.c:3248 [inline]\n __do_sys_mount fs/namespace.c:3456 [inline]\n __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433\n do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nThe root cause is multi f2fs filesystem instances can race on accessing\nglobal fsync_entry_slab pointer, result in use-after-free issue of slab\ncache, fixes to init/destroy this slab cache only once during module\ninit/destroy procedure to avoid this issue."
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    "datePublished": "2024-05-21T14:35:45.093Z",
    "dateReserved": "2024-05-21T14:28:16.977Z",
    "dateUpdated": "2024-08-04T05:32:08.535Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47335\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:20.350\",\"lastModified\":\"2024-05-21T16:54:26.047\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nf2fs: fix to avoid racing on fsync_entry_slab by multi filesystem instances\\n\\nAs syzbot reported, there is an use-after-free issue during f2fs recovery:\\n\\nUse-after-free write at 0xffff88823bc16040 (in kfence-#10):\\n kmem_cache_destroy+0x1f/0x120 mm/slab_common.c:486\\n f2fs_recover_fsync_data+0x75b0/0x8380 fs/f2fs/recovery.c:869\\n f2fs_fill_super+0x9393/0xa420 fs/f2fs/super.c:3945\\n mount_bdev+0x26c/0x3a0 fs/super.c:1367\\n legacy_get_tree+0xea/0x180 fs/fs_context.c:592\\n vfs_get_tree+0x86/0x270 fs/super.c:1497\\n do_new_mount fs/namespace.c:2905 [inline]\\n path_mount+0x196f/0x2be0 fs/namespace.c:3235\\n do_mount fs/namespace.c:3248 [inline]\\n __do_sys_mount fs/namespace.c:3456 [inline]\\n __se_sys_mount+0x2f9/0x3b0 fs/namespace.c:3433\\n do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47\\n entry_SYSCALL_64_after_hwframe+0x44/0xae\\n\\nThe root cause is multi f2fs filesystem instances can race on accessing\\nglobal fsync_entry_slab pointer, result in use-after-free issue of slab\\ncache, fixes to init/destroy this slab cache only once during module\\ninit/destroy procedure to avoid this issue.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: f2fs: soluci\u00f3n para evitar ejecuci\u00f3nes en fsync_entry_slab por instancias de m\u00faltiples sistemas de archivos. Como inform\u00f3 syzbot, hay un problema de use after free durante la recuperaci\u00f3n de f2fs: escritura de use after free en 0xffff88823bc16040 ( en 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 _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 [en l\u00ednea] path_mount+0x196f/0x2be0 fs /namespace.c:3235 do_mount fs/namespace.c:3248 [en l\u00ednea] __do_sys_mount fs/namespace.c:3456 [en l\u00ednea] __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 La causa principal es que varias instancias del sistema de archivos f2fs pueden acelerarse al acceder al puntero global fsync_entry_slab, lo que resulta en un problema de use after free del cach\u00e9 de slab, se corrige para iniciar/destruir este cach\u00e9 de slab solo una vez durante procedimiento de inicio/destrucci\u00f3n del m\u00f3dulo para evitar este problema.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/79fa5d944c875711253a23b8155b36883c696409\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/86786603014e0a22d0d6af8e80ae4b8687927048\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cad83c968c2ebe97905f900326988ed37146c347\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e472b276a0d2180808009be38105e12754432e2a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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