1.5 KiB
CVE-2024-26773
Description
In the Linux kernel, the following vulnerability has been resolved:ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()Determine if the group block bitmap is corrupted before using ac_b_ex inext4_mb_try_best_found() to avoid allocating blocks from a group with acorrupted block bitmap in the following concurrency and making thesituation worse.ext4_mb_regular_allocator ext4_lock_group(sb, group) ext4_mb_good_group // check if the group bbitmap is corrupted ext4_mb_complex_scan_group // Scan group gets ac_b_ex but doesn't use it ext4_unlock_group(sb, group) ext4_mark_group_bitmap_corrupted(group) // The block bitmap was corrupted during // the group unlock gap. ext4_mb_try_best_found ext4_lock_group(ac->ac_sb, group) ext4_mb_use_best_found mb_mark_used // Allocating blocks in block bitmap corrupted group
POC
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