CVE-2024-56582

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> btrfs: fix use-after-free in btrfs_encoded_read_endio()<br /> <br /> Shinichiro reported the following use-after free that sometimes is<br /> happening in our CI system when running fstests&amp;#39; btrfs/284 on a TCMU<br /> runner device:<br /> <br /> BUG: KASAN: slab-use-after-free in lock_release+0x708/0x780<br /> Read of size 8 at addr ffff888106a83f18 by task kworker/u80:6/219<br /> <br /> CPU: 8 UID: 0 PID: 219 Comm: kworker/u80:6 Not tainted 6.12.0-rc6-kts+ #15<br /> Hardware name: Supermicro Super Server/X11SPi-TF, BIOS 3.3 02/21/2020<br /> Workqueue: btrfs-endio btrfs_end_bio_work [btrfs]<br /> Call Trace:<br /> <br /> dump_stack_lvl+0x6e/0xa0<br /> ? lock_release+0x708/0x780<br /> print_report+0x174/0x505<br /> ? lock_release+0x708/0x780<br /> ? __virt_addr_valid+0x224/0x410<br /> ? lock_release+0x708/0x780<br /> kasan_report+0xda/0x1b0<br /> ? lock_release+0x708/0x780<br /> ? __wake_up+0x44/0x60<br /> lock_release+0x708/0x780<br /> ? __pfx_lock_release+0x10/0x10<br /> ? __pfx_do_raw_spin_lock+0x10/0x10<br /> ? lock_is_held_type+0x9a/0x110<br /> _raw_spin_unlock_irqrestore+0x1f/0x60<br /> __wake_up+0x44/0x60<br /> btrfs_encoded_read_endio+0x14b/0x190 [btrfs]<br /> btrfs_check_read_bio+0x8d9/0x1360 [btrfs]<br /> ? lock_release+0x1b0/0x780<br /> ? trace_lock_acquire+0x12f/0x1a0<br /> ? __pfx_btrfs_check_read_bio+0x10/0x10 [btrfs]<br /> ? process_one_work+0x7e3/0x1460<br /> ? lock_acquire+0x31/0xc0<br /> ? process_one_work+0x7e3/0x1460<br /> process_one_work+0x85c/0x1460<br /> ? __pfx_process_one_work+0x10/0x10<br /> ? assign_work+0x16c/0x240<br /> worker_thread+0x5e6/0xfc0<br /> ? __pfx_worker_thread+0x10/0x10<br /> kthread+0x2c3/0x3a0<br /> ? __pfx_kthread+0x10/0x10<br /> ret_from_fork+0x31/0x70<br /> ? __pfx_kthread+0x10/0x10<br /> ret_from_fork_asm+0x1a/0x30<br /> <br /> <br /> Allocated by task 3661:<br /> kasan_save_stack+0x30/0x50<br /> kasan_save_track+0x14/0x30<br /> __kasan_kmalloc+0xaa/0xb0<br /> btrfs_encoded_read_regular_fill_pages+0x16c/0x6d0 [btrfs]<br /> send_extent_data+0xf0f/0x24a0 [btrfs]<br /> process_extent+0x48a/0x1830 [btrfs]<br /> changed_cb+0x178b/0x2ea0 [btrfs]<br /> btrfs_ioctl_send+0x3bf9/0x5c20 [btrfs]<br /> _btrfs_ioctl_send+0x117/0x330 [btrfs]<br /> btrfs_ioctl+0x184a/0x60a0 [btrfs]<br /> __x64_sys_ioctl+0x12e/0x1a0<br /> do_syscall_64+0x95/0x180<br /> entry_SYSCALL_64_after_hwframe+0x76/0x7e<br /> <br /> Freed by task 3661:<br /> kasan_save_stack+0x30/0x50<br /> kasan_save_track+0x14/0x30<br /> kasan_save_free_info+0x3b/0x70<br /> __kasan_slab_free+0x4f/0x70<br /> kfree+0x143/0x490<br /> btrfs_encoded_read_regular_fill_pages+0x531/0x6d0 [btrfs]<br /> send_extent_data+0xf0f/0x24a0 [btrfs]<br /> process_extent+0x48a/0x1830 [btrfs]<br /> changed_cb+0x178b/0x2ea0 [btrfs]<br /> btrfs_ioctl_send+0x3bf9/0x5c20 [btrfs]<br /> _btrfs_ioctl_send+0x117/0x330 [btrfs]<br /> btrfs_ioctl+0x184a/0x60a0 [btrfs]<br /> __x64_sys_ioctl+0x12e/0x1a0<br /> do_syscall_64+0x95/0x180<br /> entry_SYSCALL_64_after_hwframe+0x76/0x7e<br /> <br /> The buggy address belongs to the object at ffff888106a83f00<br /> which belongs to the cache kmalloc-rnd-07-96 of size 96<br /> The buggy address is located 24 bytes inside of<br /> freed 96-byte region [ffff888106a83f00, ffff888106a83f60)<br /> <br /> The buggy address belongs to the physical page:<br /> page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888106a83800 pfn:0x106a83<br /> flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)<br /> page_type: f5(slab)<br /> raw: 0017ffffc0000000 ffff888100053680 ffffea0004917200 0000000000000004<br /> raw: ffff888106a83800 0000000080200019 00000001f5000000 0000000000000000<br /> page dumped because: kasan: bad access detected<br /> <br /> Memory state around the buggy address:<br /> ffff888106a83e00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc<br /> ffff888106a83e80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc<br /> &gt;ffff888106a83f00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc<br /> ^<br /> ffff888106a83f80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc<br /> ffff888106a84000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00<br /> ==================================================================<br /> <br /> Further analyzing the trace and <br /> ---truncated---