KASAN: use-after-free Read in release_metapage (4)

Status: auto-obsoleted due to no activity on 2025/08/30 02:20
Reported-by: syzbot+163200ef55c12985d915@syzkaller.appspotmail.com
First crash: 437d, last: 437d
▶ ▼ Similar bugs (11)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 KASAN: use-after-free Read in release_metapage (2) 19 3 557d 628d 0/3 auto-obsoleted due to no activity on 2025/05/01 23:31
linux-6.1 KASAN: use-after-free Read in release_metapage (5) 19 2 189d 189d 0/3 auto-obsoleted due to no activity on 2026/05/05 00:34
upstream KASAN: use-after-free Read in release_metapage jfs 19 syz, C error done 3221 9h40m 1308d 0/29 upstream: reported C repro on 2023/01/02 10:00
linux-6.1 KASAN: use-after-free Read in release_metapage 19 1 1047d 1047d 0/3 auto-obsoleted due to no activity on 2023/12/29 12:55
linux-5.15 BUG: spinlock bad magic in release_metapage origin:upstream 19 syz, C error 95 7d15h 686d 0/3 upstream: reported C repro on 2024/09/15 11:43
linux-4.14 KASAN: use-after-free Read in release_metapage 19 1 1362d 1362d 0/1 auto-obsoleted due to no activity on 2023/03/09 00:53
linux-6.1 KASAN: use-after-free Read in release_metapage (6) 19 syz, C 2 18d 49d 0/3 upstream: reported C repro on 2026/06/14 02:56
linux-6.1 KASAN: use-after-free Read in release_metapage (2) 19 1 822d 822d 0/3 auto-obsoleted due to no activity on 2024/08/10 05:44
linux-5.15 KASAN: use-after-free Read in release_metapage 19 1 1025d 1025d 0/3 auto-obsoleted due to no activity on 2024/01/20 09:39
linux-6.1 KASAN: use-after-free Read in release_metapage (3) 19 1 628d 628d 0/3 auto-obsoleted due to no activity on 2025/02/20 12:24
upstream BUG: spinlock bad magic in release_metapage prio:high jfs 15 syz, C inconclusive 866 1d00h 691d 0/29 upstream: reported C repro on 2024/09/10 08:16

Sample crash report:
loop4: detected capacity change from 0 to 32768
==================================================================
BUG: KASAN: use-after-free in drop_metapage fs/jfs/jfs_metapage.c:223 [inline]
BUG: KASAN: use-after-free in release_metapage+0x718/0xc90 fs/jfs/jfs_metapage.c:757
Read of size 8 at addr ffff0000d4fae310 by task syz.4.877/6958

CPU: 1 PID: 6958 Comm: syz.4.877 Not tainted 6.1.139-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x88/0x220 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:427
 kasan_report+0xa8/0x100 mm/kasan/report.c:531
 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351
 drop_metapage fs/jfs/jfs_metapage.c:223 [inline]
 release_metapage+0x718/0xc90 fs/jfs/jfs_metapage.c:757
 write_metapage fs/jfs/jfs_metapage.h:75 [inline]
 flush_metapage fs/jfs/jfs_metapage.h:81 [inline]
 ea_write+0x4e0/0xb40 fs/jfs/xattr.c:280
 ea_put fs/jfs/xattr.c:619 [inline]
 __jfs_setxattr+0xa20/0xfc8 fs/jfs/xattr.c:792
 __jfs_xattr_set+0xe0/0x178 fs/jfs/xattr.c:941
 jfs_xattr_set+0x58/0x70 fs/jfs/xattr.c:965
 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182
 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216
 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277
 vfs_setxattr+0x158/0x2ac fs/xattr.c:309
 do_setxattr fs/xattr.c:594 [inline]
 setxattr+0x228/0x28c fs/xattr.c:617
 path_setxattr+0x12c/0x25c fs/xattr.c:636
 __do_sys_lsetxattr fs/xattr.c:659 [inline]
 __se_sys_lsetxattr fs/xattr.c:655 [inline]
 __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:655
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Allocated by task 6958:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505
 __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x74/0x43c mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 slab_alloc mm/slub.c:3406 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3413 [inline]
 kmem_cache_alloc+0x234/0x318 mm/slub.c:3422
 mempool_alloc_slab+0x58/0x74 mm/mempool.c:512
 mempool_alloc+0x150/0x3f4 mm/mempool.c:392
 alloc_metapage fs/jfs/jfs_metapage.c:176 [inline]
 __get_metapage+0x5c4/0xfcc fs/jfs/jfs_metapage.c:651
 ea_write+0x470/0xb40 fs/jfs/xattr.c:256
 ea_put fs/jfs/xattr.c:619 [inline]
 __jfs_setxattr+0xa20/0xfc8 fs/jfs/xattr.c:792
 __jfs_xattr_set+0xe0/0x178 fs/jfs/xattr.c:941
 jfs_xattr_set+0x58/0x70 fs/jfs/xattr.c:965
 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182
 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216
 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277
 vfs_setxattr+0x158/0x2ac fs/xattr.c:309
 do_setxattr fs/xattr.c:594 [inline]
 setxattr+0x228/0x28c fs/xattr.c:617
 path_setxattr+0x12c/0x25c fs/xattr.c:636
 __do_sys_lsetxattr fs/xattr.c:659 [inline]
 __se_sys_lsetxattr fs/xattr.c:655 [inline]
 __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:655
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Freed by task 6965:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_free_info+0x3c/0x60 mm/kasan/generic.c:516
 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:236
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook+0x16c/0x1ec mm/slub.c:1750
 slab_free mm/slub.c:3661 [inline]
 kmem_cache_free+0x11c/0x324 mm/slub.c:3683
 mempool_free_slab+0x28/0x38 mm/mempool.c:519
 mempool_free+0xbc/0x2e0 mm/mempool.c:501
 free_metapage fs/jfs/jfs_metapage.c:191 [inline]
 metapage_release_folio+0x44c/0x5b8 fs/jfs/jfs_metapage.c:551
 filemap_release_folio+0x170/0x248 mm/filemap.c:4043
 fallback_migrate_folio mm/migrate.c:919 [inline]
 move_to_new_folio+0x2ec/0xb5c mm/migrate.c:961
 __migrate_folio_move mm/migrate.c:1199 [inline]
 migrate_folio_move mm/migrate.c:1297 [inline]
 migrate_pages_batch mm/migrate.c:1639 [inline]
 migrate_pages+0x259c/0x3bbc mm/migrate.c:1843
 compact_zone+0x2274/0x3c94 mm/compaction.c:2414
 compact_node+0x1d8/0x370 mm/compaction.c:2691
 compact_nodes mm/compaction.c:2707 [inline]
 sysctl_compaction_handler+0x88/0x108 mm/compaction.c:2749
 proc_sys_call_handler+0x3fc/0x69c fs/proc/proc_sysctl.c:602
 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:628
 do_iter_readv_writev fs/read_write.c:-1 [inline]
 do_iter_write+0x530/0x91c fs/read_write.c:861
 vfs_iter_write+0x88/0xac fs/read_write.c:902
 iter_file_splice_write+0x500/0xa18 fs/splice.c:685
 do_splice_from fs/splice.c:763 [inline]
 direct_splice_actor+0xe4/0x134 fs/splice.c:950
 splice_direct_to_actor+0x3b4/0x978 fs/splice.c:896
 do_splice_direct+0x158/0x244 fs/splice.c:1002
 do_sendfile+0x458/0xc88 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __arm64_sys_sendfile64+0x130/0x360 fs/read_write.c:1309
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000d4fae2e8
 which belongs to the cache jfs_mp of size 184
The buggy address is located 40 bytes inside of
 184-byte region [ffff0000d4fae2e8, ffff0000d4fae3a0)

The buggy address belongs to the physical page:
page:00000000ccb5f087 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114fae
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 0000000000000000 dead000000000122 ffff0000c6ed4480
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d4fae200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000d4fae280: fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb
>ffff0000d4fae300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff0000d4fae380: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d4fae400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/05/22 02:19 linux-6.1.y 325285d9fc86 0919b50b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Read in release_metapage
* Struck through repros no longer work on HEAD.