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CVE-2024-50014

Description

In the Linux kernel, the following vulnerability has been resolved:ext4: fix access to uninitialised lock in fc replay pathThe following kernel trace can be triggered with fstest generic/629 whenexecuted against a filesystem with fast-commit feature enabled:INFO: trying to register non-static key.The code is fine but needs lockdep annotation, or maybeyou didn't initialize this object before use?turning off the locking correctness validator.CPU: 0 PID: 866 Comm: mount Not tainted 6.10.0+ #11Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-3-gd478f380-prebuilt.qemu.org 04/01/2014Call Trace: dump_stack_lvl+0x66/0x90 register_lock_class+0x759/0x7d0 __lock_acquire+0x85/0x2630 ? __find_get_block+0xb4/0x380 lock_acquire+0xd1/0x2d0 ? __ext4_journal_get_write_access+0xd5/0x160 _raw_spin_lock+0x33/0x40 ? __ext4_journal_get_write_access+0xd5/0x160 __ext4_journal_get_write_access+0xd5/0x160 ext4_reserve_inode_write+0x61/0xb0 __ext4_mark_inode_dirty+0x79/0x270 ? ext4_ext_replay_set_iblocks+0x2f8/0x450 ext4_ext_replay_set_iblocks+0x330/0x450 ext4_fc_replay+0x14c8/0x1540 ? jread+0x88/0x2e0 ? rcu_is_watching+0x11/0x40 do_one_pass+0x447/0xd00 jbd2_journal_recover+0x139/0x1b0 jbd2_journal_load+0x96/0x390 ext4_load_and_init_journal+0x253/0xd40 ext4_fill_super+0x2cc6/0x3180...In the replay path there's an attempt to lock sbi->s_bdev_wb_lock infunction ext4_check_bdev_write_error(). Unfortunately, at this point thisspinlock has not been initialized yet. Moving it's initialization to anearlier point in __ext4_fill_super() fixes this splat.

POC

Reference

No PoCs from references.

Github

- https://github.com/w4zu/Debian_security