CVE-2024-50006

ext4: fix i_data_sem unlock order in ext4_ind_migrate()

State: Published
Severity: Not scored
Published: Oct 21, 2024
Updated: Oct 15, 2026
Reserved: Oct 21, 2024

Description

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

ext4: fix i_data_sem unlock order in ext4_ind_migrate()

Fuzzing reports a possible deadlock in jbd2_log_wait_commit.

This issue is triggered when an EXT4_IOC_MIGRATE ioctl is set to require synchronous updates because the file descriptor is opened with O_SYNC. This can lead to the jbd2_journal_stop() function calling jbd2_might_wait_for_commit(), potentially causing a deadlock if the EXT4_IOC_MIGRATE call races with a write(2) system call.

This problem only arises when CONFIG_PROVE_LOCKING is enabled. In this case, the jbd2_might_wait_for_commit macro locks jbd2_handle in the jbd2_journal_stop function while i_data_sem is locked. This triggers lockdep because the jbd2_journal_start function might also lock the same jbd2_handle simultaneously.

Found by Linux Verification Center (linuxtesting.org) with syzkaller.

Rule: add

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before 4192adefc9c570698821c5eb9873320eac2fcbf1Affected e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before 3c46d6060d3e38de22196c1fe7706c5a3c696285Affected e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before 53b1999cfd2c7addf2e581a32865fe8835467b44Affected e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before ef05572da0c0eb89614ed01cc17d3c882bdbd1ffAffected e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before 9fedf51ab8cf7b69bff08f37fe0989fec7f5d870Affected e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before d43776b907659affef1de888525847d64b244194Affected e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before 6252cb6bde7fc76cb8dcb49d1def7c326b190820Affected e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before d58a00e981d3118b91d503da263e640b7cde6729Affected e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before cc749e61c011c255d81b192a822db650c68b313fAffected
LinuxLinux	3.10Affected before 3.10Not affected 4.19.323 through 4.19.Not affected 5.4.285 through 5.4.Not affected 5.10.227 through 5.10.Not affected 5.15.168 through 5.15.Not affected 6.1.113 through 6.1.Not affected 6.6.55 through 6.6.Not affected 6.10.14 through 6.10.Not affected 6.11.3 through 6.11.Not affected 6.12 and laterNot affected

Product

Versions

LinuxLinux

e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before 4192adefc9c570698821c5eb9873320eac2fcbf1Affected
e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before 3c46d6060d3e38de22196c1fe7706c5a3c696285Affected
e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before 53b1999cfd2c7addf2e581a32865fe8835467b44Affected
e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before ef05572da0c0eb89614ed01cc17d3c882bdbd1ffAffected
e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before 9fedf51ab8cf7b69bff08f37fe0989fec7f5d870Affected
e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before d43776b907659affef1de888525847d64b244194Affected
e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before 6252cb6bde7fc76cb8dcb49d1def7c326b190820Affected
e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before d58a00e981d3118b91d503da263e640b7cde6729Affected
e8238f9a8339b3578c85e4192a7a23bc2bdc0333 to before cc749e61c011c255d81b192a822db650c68b313fAffected

LinuxLinux

3.10Affected
before 3.10Not affected
4.19.323 through 4.19.*Not affected
5.4.285 through 5.4.*Not affected
5.10.227 through 5.10.*Not affected
5.15.168 through 5.15.*Not affected
6.1.113 through 6.1.*Not affected
6.6.55 through 6.6.*Not affected
6.10.14 through 6.10.*Not affected
6.11.3 through 6.11.*Not affected
6.12 and laterNot affected

References

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