syzbot


KASAN: use-after-free Read in udf_sync_fs

Status: fixed on 2024/02/03 12:44
Subsystems: udf
[Documentation on labels]
Reported-by: syzbot+82df44ede2faca24c729@syzkaller.appspotmail.com
Fix commit: 6f861765464f fs: Block writes to mounted block devices
First crash: 327d, last: 141d
Cause bisection: introduced by (bisect log) :
commit e8b4274735e416621cfb28c2802b4ad52da35d0f
Author: Steve Magnani <steve.magnani@digidescorp.com>
Date: Fri Feb 8 17:34:55 2019 +0000

  udf: finalize integrity descriptor before writeback

Crash: KASAN: slab-out-of-bounds Read in udf_finalize_lvid (log)
Repro: C syz .config
  
Fix bisection: fixed by (bisect log) :
commit 6f861765464f43a71462d52026fbddfc858239a5
Author: Jan Kara <jack@suse.cz>
Date: Wed Nov 1 17:43:10 2023 +0000

  fs: Block writes to mounted block devices

  
Discussions (6)
Title Replies (including bot) Last reply
[syzbot] [udf?] KASAN: use-after-free Read in udf_sync_fs 1 (4) 2024/02/01 09:14
[syzbot] Monthly udf report (Jan 2024) 0 (1) 2024/01/10 20:36
[syzbot] Monthly udf report (Dec 2023) 0 (1) 2023/12/11 09:40
[PATCH] fs: udf: super.c: Fix a use-after-free issue in udf_finalize_lvid 6 (6) 2023/11/03 08:45
[syzbot] Monthly udf report (Oct 2023) 0 (1) 2023/10/09 09:23
[syzbot] Monthly udf report (Sep 2023) 0 (1) 2023/09/08 14:11
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 KASAN: use-after-free Read in udf_sync_fs origin:upstream C 12 5d01h 336d 0/3 upstream: reported C repro on 2023/06/16 18:53
linux-6.1 KASAN: use-after-free Read in udf_sync_fs origin:upstream C 6 14d 334d 0/3 upstream: reported C repro on 2023/06/18 11:33
Last patch testing requests (13)
Created Duration User Patch Repo Result
2024/01/14 02:11 20m retest repro upstream OK log
2024/01/14 02:11 20m retest repro upstream OK log
2024/01/14 02:11 23m retest repro upstream OK log
2024/01/12 13:10 20m retest repro upstream OK log
2024/01/12 13:10 23m retest repro upstream OK log
2024/01/12 13:10 24m retest repro upstream OK log
2024/01/12 13:10 20m retest repro upstream OK log
2024/01/12 13:10 26m retest repro upstream OK log
2024/01/12 00:23 16m retest repro upstream OK log
2024/01/12 00:23 27m retest repro upstream OK log
2023/08/13 07:49 55m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f8de32cc060b OK log
2023/08/13 02:03 35m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f8de32cc060b report log
2023/08/13 01:08 24m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f8de32cc060b report log

Sample crash report:
loop0: detected capacity change from 0 to 2048
UDF-fs: warning (device loop0): udf_load_vrs: No anchor found
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000)
==================================================================
BUG: KASAN: use-after-free in crc_itu_t+0x21c/0x2a0 lib/crc-itu-t.c:60
Read of size 1 at addr ffff888066830000 by task syz-executor150/5056

CPU: 1 PID: 5056 Comm: syz-executor150 Not tainted 6.7.0-rc6-syzkaller-00022-g55cb5f43689d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:475
 kasan_report+0x142/0x170 mm/kasan/report.c:588
 crc_itu_t+0x21c/0x2a0 lib/crc-itu-t.c:60
 udf_finalize_lvid fs/udf/super.c:1984 [inline]
 udf_sync_fs+0x1d2/0x380 fs/udf/super.c:2340
 sync_filesystem+0xec/0x220 fs/sync.c:56
 generic_shutdown_super+0x72/0x2c0 fs/super.c:669
 kill_block_super+0x44/0x90 fs/super.c:1667
 deactivate_locked_super+0xc1/0x130 fs/super.c:484
 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1256
 task_work_run+0x24a/0x300 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa2c/0x2740 kernel/exit.c:869
 do_group_exit+0x206/0x2c0 kernel/exit.c:1018
 __do_sys_exit_group kernel/exit.c:1029 [inline]
 __se_sys_exit_group kernel/exit.c:1027 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1027
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fdf7c50f349
Code: Unable to access opcode bytes at 0x7fdf7c50f31f.
RSP: 002b:00007ffe168fc088 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fdf7c50f349
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 00007fdf7c59b390 R08: ffffffffffffffb0 R09: 00007ffe168fc150
R10: 000080001d00c0d0 R11: 0000000000000246 R12: 00007fdf7c59b390
R13: 0000000000000000 R14: 00007fdf7c59c100 R15: 00007fdf7c4d99f0
 </TASK>

The buggy address belongs to the physical page:
page:ffffea00019a0c00 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x66830
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea00019a0c48 ffffea00019915c8 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 5056, tgid 5056 (syz-executor150), ts 70180314734, free_ts 70181726484
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1544 [inline]
 get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3312
 __alloc_pages+0x255/0x680 mm/page_alloc.c:4568
 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133
 vma_alloc_folio+0xf3/0x3f0 mm/mempolicy.c:2172
 wp_page_copy mm/memory.c:3120 [inline]
 do_wp_page+0x125e/0x4d40 mm/memory.c:3511
 handle_pte_fault mm/memory.c:5055 [inline]
 __handle_mm_fault mm/memory.c:5180 [inline]
 handle_mm_fault+0x1b1c/0x6680 mm/memory.c:5345
 do_user_addr_fault arch/x86/mm/fault.c:1364 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1561
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1137 [inline]
 free_unref_page_prepare+0x931/0xa60 mm/page_alloc.c:2347
 free_unref_page_list+0x5a0/0x840 mm/page_alloc.c:2533
 release_pages+0x2117/0x2400 mm/swap.c:1042
 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:293 [inline]
 tlb_flush_mmu+0x34c/0x4e0 mm/mmu_gather.c:300
 tlb_finish_mmu+0xd4/0x1f0 mm/mmu_gather.c:392
 exit_mmap+0x4d3/0xc60 mm/mmap.c:3321
 __mmput+0x115/0x3c0 kernel/fork.c:1349
 exit_mm+0x21f/0x300 kernel/exit.c:567
 do_exit+0x9af/0x2740 kernel/exit.c:856
 do_group_exit+0x206/0x2c0 kernel/exit.c:1018
 __do_sys_exit_group kernel/exit.c:1029 [inline]
 __se_sys_exit_group kernel/exit.c:1027 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1027
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Memory state around the buggy address:
 ffff88806682ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88806682ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888066830000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888066830080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888066830100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================

Crashes (37):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/12/20 03:39 upstream 55cb5f43689d 3ad490ea .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/11/19 05:37 upstream 05aa69b096a0 cb976f63 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in udf_sync_fs
2023/11/12 10:58 upstream 1b907d050735 6d6dbf8a .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/11/12 10:30 upstream 1b907d050735 6d6dbf8a .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/10/31 02:03 upstream 14ab6d425e80 b5729d82 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in udf_sync_fs
2023/10/23 06:26 upstream 05d3ef8bba77 361b23dc .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/10/15 19:29 upstream 9a3dad63edbe 6388bc36 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in udf_sync_fs
2023/10/13 16:47 upstream ce583d5fb9d3 6388bc36 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in udf_sync_fs
2023/10/04 06:18 upstream cbf3a2cb156a 65faba36 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in udf_sync_fs
2023/10/03 13:44 upstream ce36c8b14987 65faba36 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/09/20 09:46 upstream 2cf0f7156238 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in udf_sync_fs
2023/09/18 05:13 upstream e789286468a9 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in udf_sync_fs
2023/08/12 10:08 upstream f8de32cc060b 39990d51 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/11/16 08:26 upstream c42d9eeef8e5 cb976f63 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-upstream-fs KASAN: slab-use-after-free Read in udf_sync_fs
2023/10/03 14:20 upstream ce36c8b14987 65faba36 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in udf_sync_fs
2023/12/28 21:05 upstream f5837722ffec fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/12/27 03:32 upstream fbafc3e621c3 fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/12/21 18:45 upstream a4aebe936554 4f9530a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/12/17 08:30 upstream 3b8a9b2e6809 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in udf_sync_fs
2023/12/05 11:32 upstream bee0e7762ad2 f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/11/26 19:49 upstream 090472ed9c92 5b429f39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/11/21 17:37 upstream 98b1cc82c4af cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/11/16 16:01 upstream 7475e51b8796 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/11/15 07:25 upstream c42d9eeef8e5 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/10/10 14:56 upstream 94f6f0550c62 c9be5398 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/10/09 10:36 upstream 94f6f0550c62 5e837c76 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/10/09 09:48 upstream 94f6f0550c62 5e837c76 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/10/06 08:07 upstream b78b18fb8ee1 db17ad9f .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/10/01 07:07 upstream 3b517966c561 8e26a358 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/09/03 01:53 upstream 92901222f83d 696ea0d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/09/01 07:00 upstream b97d64c72259 696ea0d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/08/31 20:18 upstream b97d64c72259 696ea0d2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/08/31 09:33 upstream ef2a0b7cdbc5 84803932 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/08/20 07:35 upstream 9e6c269de404 d216d8a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/08/12 22:17 upstream ae545c3283dc 39990d51 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
2023/08/07 10:38 upstream 52a93d39b17d 0ef3dfda .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: use-after-free Read in udf_sync_fs
2023/06/25 06:17 upstream a92b7d26c743 79782afc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: use-after-free Read in udf_sync_fs
* Struck through repros no longer work on HEAD.