CVE-2024-47690: f2fs: get rid of online repaire on corrupted directory
In the Linux kernel, the following vulnerability has been resolved:
f2fs: get rid of online repaire on corrupted directory
syzbot reports a f2fs bug as below:
kernel BUG at fs/f2fs/inode.c:896! RIP: 0010:f2fsevictinode+0x1598/0x15c0 fs/f2fs/inode.c:896 Call Trace: evict+0x532/0x950 fs/inode.c:704 disposelist fs/inode.c:747 [inline] evictinodes+0x5f9/0x690 fs/inode.c:797 genericshutdownsuper+0x9d/0x2d0 fs/super.c:627 killblocksuper+0x44/0x90 fs/super.c:1696 killf2fssuper+0x344/0x690 fs/f2fs/super.c:4898 deactivatelockedsuper+0xc4/0x130 fs/super.c:473 cleanupmnt+0x41f/0x4b0 fs/namespace.c:1373 taskworkrun+0x24f/0x310 kernel/taskwork.c:228 ptracenotify+0x2d2/0x380 kernel/signal.c:2402 ptracereportsyscall include/linux/ptrace.h:415 [inline] ptracereportsyscallexit include/linux/ptrace.h:477 [inline] syscallexitwork+0xc6/0x190 kernel/entry/common.c:173 syscallexittousermodeprepare kernel/entry/common.c:200 [inline] syscallexittousermodework kernel/entry/common.c:205 [inline] syscallexittousermode+0x279/0x370 kernel/entry/common.c:218 dosyscall64+0x100/0x230 arch/x86/entry/common.c:89 entrySYSCALL64afterhwframe+0x77/0x7f RIP: 0010:f2fsevictinode+0x1598/0x15c0 fs/f2fs/inode.c:896
Online repaire on corrupted directory in f2fslookup() can generate dirty data/meta while racing w/ readonly remount, it may leave dirty inode after filesystem becomes readonly, however, checkpoint() will skips flushing dirty inode in a state of readonly mode, result in above panic.
Let's get rid of online repaire in f2fslookup(), and leave the work to fsck.f2fs.
Other sources
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— Launchpad
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.25-1Fixed in 6.12.27-1 - Upgrade
Upgrade
debian/linux-6.1to a version that resolves this vulnerability.Fixed in 6.1.129-1~deb11u1
Event History
Frequently Asked Questions
What systems are affected by CVE-2024-47690?
Vulnerable systems include various versions of the Linux kernel ranging from 4.1 to 6.11.2.
What is the severity of CVE-2024-47690?
The severity of CVE-2024-47690 is currently classified as medium due to potential impact on system stability.
How do I fix CVE-2024-47690?
To resolve CVE-2024-47690, update your Linux kernel to a version that has not been affected, such as 6.1.128-1 or 6.12.15-1.
What type of vulnerability is CVE-2024-47690?
CVE-2024-47690 is classified as a bug in the f2fs file system handling within the Linux kernel.
Can CVE-2024-47690 lead to data loss?
Yes, CVE-2024-47690 may lead to data corruption in f2fs file systems when handling directories.