syzbot


KASAN: slab-use-after-free Read in gfs2_invalidate_folio

Status: upstream: reported C repro on 2024/04/11 16:17
Subsystems: gfs2
[Documentation on labels]
Reported-by: syzbot+3a36aeabd31497d63f6e@syzkaller.appspotmail.com
First crash: 40d, last: 26d
Discussions (2)
Title Replies (including bot) Last reply
[syzbot] Monthly gfs2 report (Apr 2024) 0 (1) 2024/04/29 12:34
[syzbot] [gfs2?] KASAN: slab-use-after-free Read in gfs2_invalidate_folio 5 (13) 2024/04/15 02:04
Last patch testing requests (8)
Created Duration User Patch Repo Result
2024/04/25 14:59 15m retest repro upstream report log
2024/04/15 02:04 17m lizhi.xu@windriver.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e8c39d0f57f3 report log
2024/04/15 01:13 17m lizhi.xu@windriver.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e8c39d0f57f3 report log
2024/04/14 08:57 15m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e8c39d0f57f3 report log
2024/04/14 01:48 15m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e8c39d0f57f3 report log
2024/04/13 14:49 14m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e8c39d0f57f3 report log
2024/04/13 09:19 16m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e8c39d0f57f3 report log
2024/04/13 05:42 11m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e8c39d0f57f3 error OK

Sample crash report:
==================================================================
BUG: KASAN: slab-use-after-free in list_empty include/linux/list.h:373 [inline]
BUG: KASAN: slab-use-after-free in gfs2_discard fs/gfs2/aops.c:617 [inline]
BUG: KASAN: slab-use-after-free in gfs2_invalidate_folio+0x718/0x820 fs/gfs2/aops.c:655
Read of size 8 at addr ffff88801db08168 by task syz-executor595/5186

CPU: 3 PID: 5186 Comm: syz-executor595 Not tainted 6.9.0-rc3-syzkaller-00073-ge8c39d0f57f3 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0xc3/0x620 mm/kasan/report.c:488
 kasan_report+0xd9/0x110 mm/kasan/report.c:601
 list_empty include/linux/list.h:373 [inline]
 gfs2_discard fs/gfs2/aops.c:617 [inline]
 gfs2_invalidate_folio+0x718/0x820 fs/gfs2/aops.c:655
 folio_invalidate mm/truncate.c:158 [inline]
 truncate_cleanup_folio+0x2ac/0x3e0 mm/truncate.c:178
 truncate_inode_pages_range+0x271/0xe90 mm/truncate.c:358
 gfs2_evict_inode+0x75b/0x1460 fs/gfs2/super.c:1508
 evict+0x2ed/0x6c0 fs/inode.c:667
 iput_final fs/inode.c:1741 [inline]
 iput.part.0+0x5a8/0x7f0 fs/inode.c:1767
 iput+0x5c/0x80 fs/inode.c:1757
 gfs2_put_super+0x2bd/0x760 fs/gfs2/super.c:625
 generic_shutdown_super+0x159/0x3d0 fs/super.c:641
 kill_block_super+0x3b/0x90 fs/super.c:1675
 gfs2_kill_sb+0x360/0x410 fs/gfs2/ops_fstype.c:1804
 deactivate_locked_super+0xbe/0x1a0 fs/super.c:472
 deactivate_super+0xde/0x100 fs/super.c:505
 cleanup_mnt+0x222/0x450 fs/namespace.c:1267
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa7d/0x2c10 kernel/exit.c:878
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1027
 __do_sys_exit_group kernel/exit.c:1038 [inline]
 __se_sys_exit_group kernel/exit.c:1036 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1036
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe708777789
Code: Unable to access opcode bytes at 0x7fe70877775f.
RSP: 002b:00007ffd15e3f838 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fe708777789
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 00007fe7088122b0 R08: ffffffffffffffb8 R09: 000000000001f6db
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe7088122b0
R13: 0000000000000000 R14: 00007fe708813020 R15: 00007fe708745cc0
 </TASK>

Allocated by task 5186:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:338
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3798 [inline]
 slab_alloc_node mm/slub.c:3845 [inline]
 kmem_cache_alloc+0x136/0x320 mm/slub.c:3852
 kmem_cache_zalloc include/linux/slab.h:739 [inline]
 gfs2_alloc_bufdata fs/gfs2/trans.c:168 [inline]
 gfs2_trans_add_data+0x4b3/0x7f0 fs/gfs2/trans.c:209
 gfs2_unstuffer_folio fs/gfs2/bmap.c:81 [inline]
 __gfs2_unstuff_inode fs/gfs2/bmap.c:119 [inline]
 gfs2_unstuff_dinode+0xad9/0x1460 fs/gfs2/bmap.c:166
 gfs2_adjust_quota+0x124/0xb10 fs/gfs2/quota.c:879
 do_sync+0xa73/0xd30 fs/gfs2/quota.c:990
 gfs2_quota_sync+0x419/0x630 fs/gfs2/quota.c:1370
 gfs2_sync_fs+0x44/0xb0 fs/gfs2/super.c:669
 sync_filesystem+0x10d/0x290 fs/sync.c:56
 generic_shutdown_super+0x7e/0x3d0 fs/super.c:620
 kill_block_super+0x3b/0x90 fs/super.c:1675
 gfs2_kill_sb+0x360/0x410 fs/gfs2/ops_fstype.c:1804
 deactivate_locked_super+0xbe/0x1a0 fs/super.c:472
 deactivate_super+0xde/0x100 fs/super.c:505
 cleanup_mnt+0x222/0x450 fs/namespace.c:1267
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa7d/0x2c10 kernel/exit.c:878
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1027
 __do_sys_exit_group kernel/exit.c:1038 [inline]
 __se_sys_exit_group kernel/exit.c:1036 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1036
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5186:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
 poison_slab_object mm/kasan/common.c:240 [inline]
 __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2106 [inline]
 slab_free mm/slub.c:4280 [inline]
 kmem_cache_free+0x12e/0x380 mm/slub.c:4344
 trans_drain fs/gfs2/log.c:1028 [inline]
 gfs2_log_flush+0x1486/0x29b0 fs/gfs2/log.c:1167
 do_sync+0x550/0xd30 fs/gfs2/quota.c:1010
 gfs2_quota_sync+0x419/0x630 fs/gfs2/quota.c:1370
 gfs2_sync_fs+0x44/0xb0 fs/gfs2/super.c:669
 sync_filesystem+0x10d/0x290 fs/sync.c:56
 generic_shutdown_super+0x7e/0x3d0 fs/super.c:620
 kill_block_super+0x3b/0x90 fs/super.c:1675
 gfs2_kill_sb+0x360/0x410 fs/gfs2/ops_fstype.c:1804
 deactivate_locked_super+0xbe/0x1a0 fs/super.c:472
 deactivate_super+0xde/0x100 fs/super.c:505
 cleanup_mnt+0x222/0x450 fs/namespace.c:1267
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa7d/0x2c10 kernel/exit.c:878
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1027
 __do_sys_exit_group kernel/exit.c:1038 [inline]
 __se_sys_exit_group kernel/exit.c:1036 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1036
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88801db08150
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 24 bytes inside of
 freed 80-byte region [ffff88801db08150, ffff88801db081a0)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1db08
flags: 0xfff80000000800(slab|node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffffff()
raw: 00fff80000000800 ffff88801a5aedc0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080240024 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 5186, tgid 5186 (syz-executor595), ts 45296183443, free_ts 44935801807
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534
 prep_new_page mm/page_alloc.c:1541 [inline]
 get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317
 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575
 __alloc_pages_node include/linux/gfp.h:238 [inline]
 alloc_pages_node include/linux/gfp.h:261 [inline]
 alloc_slab_page mm/slub.c:2175 [inline]
 allocate_slab mm/slub.c:2338 [inline]
 new_slab+0xcc/0x3a0 mm/slub.c:2391
 ___slab_alloc+0x66d/0x1790 mm/slub.c:3525
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3610
 __slab_alloc_node mm/slub.c:3663 [inline]
 slab_alloc_node mm/slub.c:3835 [inline]
 kmem_cache_alloc+0x2e9/0x320 mm/slub.c:3852
 kmem_cache_zalloc include/linux/slab.h:739 [inline]
 gfs2_alloc_bufdata fs/gfs2/trans.c:168 [inline]
 gfs2_trans_add_meta+0xade/0xf50 fs/gfs2/trans.c:251
 gfs2_alloc_extent fs/gfs2/rgrp.c:2239 [inline]
 gfs2_alloc_blocks+0x46c/0x19c0 fs/gfs2/rgrp.c:2449
 __gfs2_unstuff_inode fs/gfs2/bmap.c:107 [inline]
 gfs2_unstuff_dinode+0x499/0x1460 fs/gfs2/bmap.c:166
 gfs2_adjust_quota+0x124/0xb10 fs/gfs2/quota.c:879
 do_sync+0xa73/0xd30 fs/gfs2/quota.c:990
 gfs2_quota_sync+0x419/0x630 fs/gfs2/quota.c:1370
 gfs2_sync_fs+0x44/0xb0 fs/gfs2/super.c:669
 sync_filesystem+0x10d/0x290 fs/sync.c:56
 generic_shutdown_super+0x7e/0x3d0 fs/super.c:620
page last free pid 4684 tgid 4684 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1141 [inline]
 free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347
 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2487
 __put_partials+0x14c/0x170 mm/slub.c:2906
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3798 [inline]
 slab_alloc_node mm/slub.c:3845 [inline]
 kmem_cache_alloc+0x136/0x320 mm/slub.c:3852
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:139
 getname_flags+0x9b/0xf0 include/linux/audit.h:322
 vfs_fstatat+0x9a/0x150 fs/stat.c:303
 __do_sys_newfstatat+0x98/0x120 fs/stat.c:468
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88801db08000: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb
 ffff88801db08080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb
>ffff88801db08100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
                                                          ^
 ffff88801db08180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb
 ffff88801db08200: fb fb 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
2024/04/11 14:53 upstream e8c39d0f57f3 3023abf0 .config console log report syz C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro] ci-qemu-upstream KASAN: slab-use-after-free Read in gfs2_invalidate_folio
* Struck through repros no longer work on HEAD.