Re: [syzbot] [gfs2?] KASAN: slab-use-after-free Read in gfs2_invalidate_folio

From: syzbot
Date: Sun Apr 14 2024 - 05:13:15 EST

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In reply to: Edward Adam Davis: "Re: [syzbot] [gfs2?] KASAN: slab-use-after-free Read in gfs2_invalidate_folio"
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Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Read in gfs2_invalidate_folio

</TASK>
bh: ffff88802f675110, bd: ffff88802f675150, trans_drain
bh: ffff88803dd9dbc8, bd: ffff88802f675150, gfs2_discard
==================================================================
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:618 [inline]
BUG: KASAN: slab-use-after-free in gfs2_invalidate_folio+0x731/0x840 fs/gfs2/aops.c:656
Read of size 8 at addr ffff88802f675168 by task syz-executor.0/5425

CPU: 0 PID: 5425 Comm: syz-executor.0 Not tainted 6.9.0-rc3-syzkaller-00073-ge8c39d0f57f3-dirty #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:618 [inline]
gfs2_invalidate_folio+0x731/0x840 fs/gfs2/aops.c:656
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
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xdc/0x260 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff35ce7f197
Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fffb7457c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff35ce7f197
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffb7457d20
RBP: 00007fffb7457d20 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffb7458de0
R13: 00007ff35cec93b9 R14: 000000000001327f R15: 0000000000000001
</TASK>

Allocated by task 5425:
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+0x4d1/0x820 fs/gfs2/trans.c:209
gfs2_unstuffer_folio fs/gfs2/bmap.c:82 [inline]
__gfs2_unstuff_inode fs/gfs2/bmap.c:122 [inline]
gfs2_unstuff_dinode+0xb30/0x1510 fs/gfs2/bmap.c:170
gfs2_adjust_quota+0x124/0xb10 fs/gfs2/quota.c:879
do_sync+0xa88/0xd40 fs/gfs2/quota.c:990
gfs2_quota_sync+0x419/0x630 fs/gfs2/quota.c:1371
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
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xdc/0x260 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5425:
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:1031 [inline]
gfs2_log_flush+0x149f/0x29c0 fs/gfs2/log.c:1170
do_sync+0x565/0xd40 fs/gfs2/quota.c:1011
gfs2_quota_sync+0x419/0x630 fs/gfs2/quota.c:1371
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
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xdc/0x260 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802f675150
which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 24 bytes inside of
freed 80-byte region [ffff88802f675150, ffff88802f6751a0)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2f675
flags: 0xfff80000000800(slab|node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffffff()
raw: 00fff80000000800 ffff888015fa28c0 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 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5425, tgid 5425 (syz-executor.0), ts 79266814979, free_ts 79245423591
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+0xae4/0xf60 fs/gfs2/trans.c:255
gfs2_alloc_extent fs/gfs2/rgrp.c:2240 [inline]
gfs2_alloc_blocks+0x4ea/0x1b30 fs/gfs2/rgrp.c:2451
__gfs2_unstuff_inode fs/gfs2/bmap.c:109 [inline]
gfs2_unstuff_dinode+0x49e/0x1510 fs/gfs2/bmap.c:170
gfs2_adjust_quota+0x124/0xb10 fs/gfs2/quota.c:879
do_sync+0xa88/0xd40 fs/gfs2/quota.c:990
gfs2_quota_sync+0x419/0x630 fs/gfs2/quota.c:1371
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 5425 tgid 5425 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
__folio_put_small mm/swap.c:119 [inline]
__folio_put+0x166/0x1f0 mm/swap.c:142
folio_put include/linux/mm.h:1506 [inline]
free_page_and_swap_cache+0x1eb/0x250 mm/swap_state.c:305
__tlb_remove_table arch/x86/include/asm/tlb.h:34 [inline]
__tlb_remove_table_free mm/mmu_gather.c:227 [inline]
tlb_remove_table_rcu+0x89/0xe0 mm/mmu_gather.c:282
rcu_do_batch kernel/rcu/tree.c:2196 [inline]
rcu_core+0x828/0x16b0 kernel/rcu/tree.c:2471
__do_softirq+0x218/0x922 kernel/softirq.c:554

Memory state around the buggy address:
ffff88802f675000: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb
ffff88802f675080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb
>ffff88802f675100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
^
ffff88802f675180: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
ffff88802f675200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Tested on:

commit: e8c39d0f Merge tag 'probes-fixes-v6.9-rc3' of git://gi..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=150cd74d180000
kernel config: https://syzkaller.appspot.com/x/.config?x=285be8dd6baeb438
dashboard link: https://syzkaller.appspot.com/bug?extid=3a36aeabd31497d63f6e
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=11383c43180000

Next message: tip-bot2 for Josh Poimboeuf: "[tip: x86/urgent] x86/bugs: Fix BHI retpoline check"
Previous message: Michael Opdenacker: "Re: (subset) [PATCH v9 0/6] riscv: sophgo: add clock support for Sophgo CV1800/SG2000 SoCs"
In reply to: Edward Adam Davis: "Re: [syzbot] [gfs2?] KASAN: slab-use-after-free Read in gfs2_invalidate_folio"
Next in thread: syzbot: "Re: [syzbot] [syzbot] [gfs2?] KASAN: slab-use-after-free Read in gfs2_invalidate_folio"
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