KASAN: use-after-free Read in jbd2_journal_get_write_access

Status: upstream: reported C repro on 2023/09/28 11:26
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+ac1ddc8b60c702c7e169@syzkaller.appspotmail.com
First crash: 1047d, last: 21d
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2023/12/14 linux-5.15.y (ToT) d0fc081c6241 C [report] KASAN: use-after-free Read in jbd2_journal_get_write_access
2023/12/14 upstream (ToT) 5bd7ef53ffe5 C Didn't crash
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 KASAN: use-after-free Read in jbd2_journal_get_write_access origin:lts 19 syz, C error 1 166d 969d 0/2 upstream: reported C repro on 2023/12/15 22:55
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/07/21 05:09 15m retest repro linux-5.15.y report log
2026/04/22 03:22 34m retest repro linux-5.15.y report log
2026/02/10 14:48 19m retest repro linux-5.15.y report log
2025/12/02 00:41 19m retest repro linux-5.15.y report log
2025/09/20 13:20 12m retest repro linux-5.15.y report log
2025/07/10 05:43 9m retest repro linux-5.15.y report log
2025/04/30 08:48 9m retest repro linux-5.15.y report log
2025/02/19 02:42 12m retest repro linux-5.15.y report log
2024/12/11 00:13 8m retest repro linux-5.15.y report log
2024/10/01 11:06 1h21m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2024/01/06 14:49 1h12m fix candidate upstream OK (0) job log

Sample crash report:
RBP: 0000000000000002 R08: 00007ffee17ee586 R09: 0000000000003432
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000050012 R14: 00007ffee17ee8ea R15: 000000000000000d
 </TASK>
==================================================================
BUG: KASAN: use-after-free in is_handle_aborted include/linux/jbd2.h:1694 [inline]
BUG: KASAN: use-after-free in jbd2_journal_get_write_access+0x12f/0x140 fs/jbd2/transaction.c:1241
Read of size 4 at addr ffff888071a53eec by task syz-executor367/3503

CPU: 0 PID: 3503 Comm: syz-executor367 Not tainted 5.15.143-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description+0x63/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
 is_handle_aborted include/linux/jbd2.h:1694 [inline]
 jbd2_journal_get_write_access+0x12f/0x140 fs/jbd2/transaction.c:1241
 __ext4_journal_get_write_access+0x257/0x6b0 fs/ext4/ext4_jbd2.c:235
 ext4_reserve_inode_write+0x2bd/0x3d0 fs/ext4/inode.c:5782
 __ext4_mark_inode_dirty+0x1d6/0x860 fs/ext4/inode.c:5956
 ext4_symlink+0xa2f/0xed0 fs/ext4/namei.c:3463
 vfs_symlink+0x2ad/0x490 fs/namei.c:4358
 do_symlinkat+0x1fd/0x600 fs/namei.c:4387
 __do_sys_symlink fs/namei.c:4409 [inline]
 __se_sys_symlink fs/namei.c:4407 [inline]
 __x64_sys_symlink+0x7a/0x90 fs/namei.c:4407
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7ff734690269
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 21 1f 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffee17ee7e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007ffee17ee7f0 RCX: 00007ff734690269
RDX: 00007ff73468f170 RSI: 0000000020000180 RDI: 0000000020000140
RBP: 0000000000000002 R08: 00007ffee17ee586 R09: 0000000000003432
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000050012 R14: 00007ffee17ee8ea R15: 000000000000000d
 </TASK>

Allocated by task 3503:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3220 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 jbd2_alloc_handle include/linux/jbd2.h:1597 [inline]
 new_handle fs/jbd2/transaction.c:477 [inline]
 jbd2__journal_start+0x144/0x5c0 fs/jbd2/transaction.c:504
 __ext4_journal_start_sb+0x175/0x370 fs/ext4/ext4_jbd2.c:105
 __ext4_new_inode+0x138b/0x4430 fs/ext4/ialloc.c:1080
 ext4_symlink+0x4c3/0xed0 fs/ext4/namei.c:3382
 vfs_symlink+0x2ad/0x490 fs/namei.c:4358
 do_symlinkat+0x1fd/0x600 fs/namei.c:4387
 __do_sys_symlink fs/namei.c:4409 [inline]
 __se_sys_symlink fs/namei.c:4407 [inline]
 __x64_sys_symlink+0x7a/0x90 fs/namei.c:4407
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 3503:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1705 [inline]
 slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
 slab_free mm/slub.c:3499 [inline]
 kmem_cache_free+0x91/0x1f0 mm/slub.c:3515
 jbd2_free_handle include/linux/jbd2.h:1602 [inline]
 jbd2_journal_stop+0x8d9/0xd70 fs/jbd2/transaction.c:1964
 __ext4_journal_stop+0xf8/0x190 fs/ext4/ext4_jbd2.c:127
 ext4_symlink+0x5fe/0xed0 fs/ext4/namei.c:3461
 vfs_symlink+0x2ad/0x490 fs/namei.c:4358
 do_symlinkat+0x1fd/0x600 fs/namei.c:4387
 __do_sys_symlink fs/namei.c:4409 [inline]
 __se_sys_symlink fs/namei.c:4407 [inline]
 __x64_sys_symlink+0x7a/0x90 fs/namei.c:4407
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

The buggy address belongs to the object at ffff888071a53ec8
 which belongs to the cache jbd2_journal_handle of size 56
The buggy address is located 36 bytes inside of
 56-byte region [ffff888071a53ec8, ffff888071a53f00)
The buggy address belongs to the page:
page:ffffea0001c694c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x71a53
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000122 ffff88814634d140
raw: 0000000000000000 00000000802e002e 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x12c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_RECLAIMABLE), pid 3492, ts 35917830207, free_ts 10187209887
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
 __alloc_pages+0x272/0x700 mm/page_alloc.c:5421
 alloc_slab_page mm/slub.c:1775 [inline]
 allocate_slab mm/slub.c:1912 [inline]
 new_slab+0xbb/0x4b0 mm/slub.c:1975
 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
 __slab_alloc mm/slub.c:3095 [inline]
 slab_alloc_node mm/slub.c:3186 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 kmem_cache_alloc+0x18e/0x280 mm/slub.c:3233
 kmem_cache_zalloc include/linux/slab.h:711 [inline]
 jbd2_alloc_handle include/linux/jbd2.h:1597 [inline]
 new_handle fs/jbd2/transaction.c:477 [inline]
 jbd2__journal_start+0x144/0x5c0 fs/jbd2/transaction.c:504
 __ext4_journal_start_sb+0x175/0x370 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
 ext4_dirty_inode+0x8b/0x100 fs/ext4/inode.c:5990
 __mark_inode_dirty+0x2fd/0xd60 fs/fs-writeback.c:2464
 mark_inode_dirty include/linux/fs.h:2436 [inline]
 generic_write_end+0x232/0x440 fs/buffer.c:2204
 ext4_da_write_end+0x72d/0x9e0 fs/ext4/inode.c:3084
 generic_perform_write+0x3b7/0x5b0 mm/filemap.c:3787
 ext4_buffered_write_iter+0x227/0x360 fs/ext4/file.c:268
 ext4_file_write_iter+0x87c/0x1990
 call_write_iter include/linux/fs.h:2146 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0xacf/0xe50 fs/read_write.c:594
 ksys_write+0x1a2/0x2c0 fs/read_write.c:647
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
 free_contig_range+0x95/0xf0 mm/page_alloc.c:9340
 destroy_args+0xfe/0x97f mm/debug_vm_pgtable.c:1018
 debug_vm_pgtable+0x40d/0x462 mm/debug_vm_pgtable.c:1331
 do_one_initcall+0x22b/0x7a0 init/main.c:1299
 do_initcall_level+0x157/0x207 init/main.c:1372
 do_initcalls+0x49/0x86 init/main.c:1388
 kernel_init_freeable+0x425/0x5b5 init/main.c:1612
 kernel_init+0x19/0x290 init/main.c:1503
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Memory state around the buggy address:
 ffff888071a53d80: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fc
 ffff888071a53e00: fc fc fc fa fb fb fb fb fb fb fc fc fc fc fa fb
>ffff888071a53e80: fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb
                                                          ^
 ffff888071a53f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888071a53f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/12/14 13:40 linux-5.15.y d0fc081c6241 3222d10c .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Read in jbd2_journal_get_write_access
2023/12/30 04:28 linux-5.15.y d93fa2c78854 fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Read in jbd2_journal_get_write_access
2023/12/14 11:53 linux-5.15.y d0fc081c6241 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Read in jbd2_journal_get_write_access
2023/10/22 08:57 linux-5.15.y 00c03985402e 361b23dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: use-after-free Read in jbd2_journal_get_write_access
2024/02/15 01:00 linux-5.15.y 6139f2a02fe0 d9b1cdd5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in jbd2_journal_get_write_access
2024/01/27 09:46 linux-5.15.y 6139f2a02fe0 cc4a4020 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in jbd2_journal_get_write_access
2024/01/13 00:02 linux-5.15.y 26c690eff0a5 551587c1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in jbd2_journal_get_write_access
2023/09/28 11:25 linux-5.15.y b911329317b4 c2ab1e5d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: use-after-free Read in jbd2_journal_get_write_access
* Struck through repros no longer work on HEAD.