CVE-2022-49363

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix to do sanity check on block address in f2fs_do_zero_range()

As Yanming reported in bugzilla:

https://bugzilla.kernel.org/show_bug.cgi?id=215894

I have encountered a bug in F2FS file system in kernel v5.17.

I have uploaded the system call sequence as case.c, and a fuzzed image can be found in google net disk

The kernel should enable CONFIG_KASAN=y and CONFIG_KASAN_INLINE=y. You can reproduce the bug by running the following commands:

kernel BUG at fs/f2fs/segment.c:2291! Call Trace: f2fs_invalidate_blocks+0x193/0x2d0 f2fs_fallocate+0x2593/0x4a70 vfs_fallocate+0x2a5/0xac0 ksys_fallocate+0x35/0x70 __x64_sys_fallocate+0x8e/0xf0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae

The root cause is, after image was fuzzed, block mapping info in inode will be inconsistent with SIT table, so in f2fs_fallocate(), it will cause panic when updating SIT with invalid blkaddr.

Lets fix the issue by adding sanity check on block address before updating SIT table with it.

Affected Software

References

• https://git.kernel.org/stable/c/25f8236213a91efdf708b9d77e9e51b6fc3e141c
• https://git.kernel.org/stable/c/470493be19a5730ed432e3ac0f29a2ee7fc6c557
• https://git.kernel.org/stable/c/7361c9f2bd6a8f0cbb41cdea9aff04765ff23f67
• https://git.kernel.org/stable/c/805b48b234a2803cb7daec7f158af12f0fbaefac
• https://git.kernel.org/stable/c/a34d7b49894b0533222188a52e2958750f830efd
• https://git.kernel.org/stable/c/f2e1c38b5ac64eb1a16a89c52fb419409d12c25b