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vulnrichmentLinuxVULNRICHMENT:CVE-2024-42273
HistoryAug 17, 2024 - 8:54 a.m.

CVE-2024-42273 f2fs: assign CURSEG_ALL_DATA_ATGC if blkaddr is valid

2024-08-1708:54:27
Linux
github.com
1
cve-2024-42273
linux kernel
f2fs
vulnerability
resolved
curseg_all_data_atgc
blkaddr
bug_on
compression
gcing flag

AI Score

6.7

Confidence

High

SSVC

Exploitation

none

Automatable

no

Technical Impact

partial

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

f2fs: assign CURSEG_ALL_DATA_ATGC if blkaddr is valid

mkdir /mnt/test/comp
f2fs_io setflags compression /mnt/test/comp
dd if=/dev/zero of=/mnt/test/comp/testfile bs=16k count=1
truncate --size 13 /mnt/test/comp/testfile

In the above scenario, we can get a BUG_ON.
kernel BUG at fs/f2fs/segment.c:3589!
Call Trace:
do_write_page+0x78/0x390 [f2fs]
f2fs_outplace_write_data+0x62/0xb0 [f2fs]
f2fs_do_write_data_page+0x275/0x740 [f2fs]
f2fs_write_single_data_page+0x1dc/0x8f0 [f2fs]
f2fs_write_multi_pages+0x1e5/0xae0 [f2fs]
f2fs_write_cache_pages+0xab1/0xc60 [f2fs]
f2fs_write_data_pages+0x2d8/0x330 [f2fs]
do_writepages+0xcf/0x270
__writeback_single_inode+0x44/0x350
writeback_sb_inodes+0x242/0x530
__writeback_inodes_wb+0x54/0xf0
wb_writeback+0x192/0x310
wb_workfn+0x30d/0x400

The reason is we gave CURSEG_ALL_DATA_ATGC to COMPR_ADDR where the
page was set the gcing flag by set_cluster_dirty().

AI Score

6.7

Confidence

High

SSVC

Exploitation

none

Automatable

no

Technical Impact

partial

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