CVE-2024-43859: f2fs: fix to truncate preallocated blocks in f2fs_file_open()
First published: Sat Aug 17 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to truncate preallocated blocks in f2fs_file_open() chenyuwen reports a f2fs bug as below: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000011 fscrypt_set_bio_crypt_ctx+0x78/0x1e8 f2fs_grab_read_bio+0x78/0x208 f2fs_submit_page_read+0x44/0x154 f2fs_get_read_data_page+0x288/0x5f4 f2fs_get_lock_data_page+0x60/0x190 truncate_partial_data_page+0x108/0x4fc f2fs_do_truncate_blocks+0x344/0x5f0 f2fs_truncate_blocks+0x6c/0x134 f2fs_truncate+0xd8/0x200 f2fs_iget+0x20c/0x5ac do_garbage_collect+0x5d0/0xf6c f2fs_gc+0x22c/0x6a4 f2fs_disable_checkpoint+0xc8/0x310 f2fs_fill_super+0x14bc/0x1764 mount_bdev+0x1b4/0x21c f2fs_mount+0x20/0x30 legacy_get_tree+0x50/0xbc vfs_get_tree+0x5c/0x1b0 do_new_mount+0x298/0x4cc path_mount+0x33c/0x5fc __arm64_sys_mount+0xcc/0x15c invoke_syscall+0x60/0x150 el0_svc_common+0xb8/0xf8 do_el0_svc+0x28/0xa0 el0_svc+0x24/0x84 el0t_64_sync_handler+0x88/0xec It is because inode.i_crypt_info is not initialized during below path: - mount - f2fs_fill_super - f2fs_disable_checkpoint - f2fs_gc - f2fs_iget - f2fs_truncate So, let's relocate truncation of preallocated blocks to f2fs_file_open(), after fscrypt_file_open().
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=5.17<6.6.44 | |
| Linux Linux kernel | >=6.7<6.10.3 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 | |
| >=5.17<6.6.44 | ||
| >=6.7<6.10.3 |
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Reference Links
- https://git.kernel.org/stable/c/298b1e4182d657c3e388adcc29477904e9600ed5
- https://git.kernel.org/stable/c/3ba0ae885215b325605ff7ebf6de12ac2adf204d
- https://git.kernel.org/stable/c/5f04969136db674f133781626e0b692c5f2bf2f0
- https://git.kernel.org/stable/c/f44a25a8bfe0c15d33244539696cd9119cf44d18
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-43859
- https://nvd.nist.gov/vuln/detail/CVE-2024-43859
- https://launchpad.net/bugs/cve/CVE-2024-43859
- https://security-tracker.debian.org/tracker/CVE-2024-43859
- https://ubuntu.com/security/CVE-2024-43859
- https://git.kernel.org/linus/298b1e4182d657c3e388adcc29477904e9600ed5
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