CVE-2024-26773

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CVE-2024-26773

Summary: ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()

Details: 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 in ext4_mb_try_best_found() to avoid allocating blocks from a group with a corrupted block bitmap in the following concurrency and making the situation 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

References: https://git.kernel.org/stable/c/0184747b552d6b5a14db3b7fcc3b792ce64dedd1, https://git.kernel.org/stable/c/21f8cfe79f776287459343e9cfa6055af61328ea, https://git.kernel.org/stable/c/260fc96283c0f594de18a1b045faf6d8fb42874d, https://git.kernel.org/stable/c/4530b3660d396a646aad91a787b6ab37cf604b53, https://git.kernel.org/stable/c/4c21fa60a6f4606f6214a38f50612b17b2f738f5, https://git.kernel.org/stable/c/927794a02169778c9c2e7b25c768ab3ea8c1dc03, https://git.kernel.org/stable/c/a2576ae9a35c078e488f2c573e9e6821d651fbbe, https://git.kernel.org/stable/c/f97e75fa4e12b0aa0224e83fcbda8853ac2adf36, https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html, https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html, https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26773.json, https://nvd.nist.gov/vuln/detail/CVE-2024-26773, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git