[moderation] [hfs?] KASAN: slab-use-after-free Read in hfs_bnode_unhash
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syzbot
Dec 26, 2023, 5:34:22 PM12/26/23
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 5254c0cbc92d Merge tag 'block-6.7-2023-12-22' of git://git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1787afd6e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=314e9ad033a7d3a7
dashboard link: https://syzkaller.appspot.com/bug?extid=90e53b7760e544d1ce6a
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386
CC: [linux-...@vger.kernel.org linux-...@vger.kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-5254c0cb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/af866e4a884a/vmlinux-5254c0cb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2f31c4098f45/bzImage-5254c0cb.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+90e53b...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in hfs_bnode_unhash+0x1ba/0x1f0 fs/hfs/bnode.c:308
Read of size 8 at addr ffff888052fa1300 by task kswapd0/108
CPU: 0 PID: 108 Comm: kswapd0 Not tainted 6.7.0-rc6-syzkaller-00248-g5254c0cbc92d #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+0xd9/0x1b0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xc4/0x620 mm/kasan/report.c:475
kasan_report+0xda/0x110 mm/kasan/report.c:588
hfs_bnode_unhash+0x1ba/0x1f0 fs/hfs/bnode.c:308
hfs_release_folio+0x429/0x570 fs/hfs/inode.c:122
filemap_release_folio+0x1f1/0x270 mm/filemap.c:4076
shrink_folio_list+0x2991/0x3f00 mm/vmscan.c:1368
evict_folios+0x6e7/0x1b90 mm/vmscan.c:4499
try_to_shrink_lruvec+0x638/0xa10 mm/vmscan.c:4704
shrink_one+0x3e6/0x7a0 mm/vmscan.c:4743
shrink_many mm/vmscan.c:4808 [inline]
lru_gen_shrink_node mm/vmscan.c:4923 [inline]
shrink_node+0x211c/0x3710 mm/vmscan.c:5863
kswapd_shrink_node mm/vmscan.c:6668 [inline]
balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6858
kswapd+0x5be/0xbf0 mm/vmscan.c:7118
kthread+0x2c6/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
</TASK>
Allocated by task 30481:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:198 [inline]
__do_kmalloc_node mm/slab_common.c:1007 [inline]
__kmalloc+0x59/0x90 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:721 [inline]
__hfs_bnode_create+0x108/0x850 fs/hfs/bnode.c:259
hfs_bnode_find+0x2cf/0xcb0 fs/hfs/bnode.c:335
hfs_brec_find+0x2af/0x510 fs/hfs/bfind.c:126
hfs_brec_read+0x26/0x120 fs/hfs/bfind.c:165
hfs_lookup+0x205/0x320 fs/hfs/dir.c:32
lookup_open.isra.0+0x926/0x13b0 fs/namei.c:3455
open_last_lookups fs/namei.c:3546 [inline]
path_openat+0x922/0x2c50 fs/namei.c:3776
do_filp_open+0x1de/0x430 fs/namei.c:3809
do_sys_openat2+0x176/0x1e0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_creat fs/open.c:1528 [inline]
__se_sys_creat fs/open.c:1522 [inline]
__ia32_sys_creat+0xcc/0x120 fs/open.c:1522
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x62/0xe0 arch/x86/entry/common.c:321
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346
entry_SYSENTER_compat_after_hwframe+0x70/0x7a
Freed by task 31584:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1800 [inline]
slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826
slab_free mm/slub.c:3809 [inline]
__kmem_cache_free+0xc0/0x180 mm/slub.c:3822
hfs_btree_close+0xac/0x390 fs/hfs/btree.c:154
hfs_mdb_put+0xbf/0x380 fs/hfs/mdb.c:360
generic_shutdown_super+0x161/0x3d0 fs/super.c:696
kill_block_super+0x3b/0x90 fs/super.c:1667
deactivate_locked_super+0xbc/0x1a0 fs/super.c:484
deactivate_super+0xde/0x100 fs/super.c:517
cleanup_mnt+0x222/0x450 fs/namespace.c:1256
task_work_run+0x14d/0x240 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x217/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296
__do_fast_syscall_32+0x6f/0xe0 arch/x86/entry/common.c:324
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346
entry_SYSENTER_compat_after_hwframe+0x70/0x7a
The buggy address belongs to the object at ffff888052fa1300
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 0 bytes inside of
freed 192-byte region [ffff888052fa1300, ffff888052fa13c0)
The buggy address belongs to the physical page:
page:ffffea00014be840 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x52fa1
flags: 0x4fff00000000800(slab|node=1|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 04fff00000000800 ffff888013042a00 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 15673, tgid 15671 (syz-executor.1), ts 882213308524, free_ts 881475117963
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1537
prep_new_page mm/page_alloc.c:1544 [inline]
get_page_from_freelist+0xa25/0x36d0 mm/page_alloc.c:3312
__alloc_pages+0x22e/0x2420 mm/page_alloc.c:4568
alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
alloc_slab_page mm/slub.c:1870 [inline]
allocate_slab mm/slub.c:2017 [inline]
new_slab+0x283/0x3c0 mm/slub.c:2070
___slab_alloc+0x979/0x1500 mm/slub.c:3223
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322
__slab_alloc_node mm/slub.c:3375 [inline]
slab_alloc_node mm/slub.c:3468 [inline]
__kmem_cache_alloc_node+0x131/0x310 mm/slub.c:3517
kmalloc_trace+0x25/0x60 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
__iomap_dio_rw+0x2a7/0x1bc0 fs/iomap/direct-io.c:563
iomap_dio_rw+0x40/0xa0 fs/iomap/direct-io.c:748
ext4_dio_read_iter fs/ext4/file.c:94 [inline]
ext4_file_read_iter+0x4dd/0x6c0 fs/ext4/file.c:145
call_read_iter include/linux/fs.h:2014 [inline]
copy_splice_read+0x418/0x8f0 fs/splice.c:364
vfs_splice_read fs/splice.c:992 [inline]
vfs_splice_read+0x2ea/0x3b0 fs/splice.c:962
splice_direct_to_actor+0x2a5/0xa30 fs/splice.c:1069
do_splice_direct+0x1af/0x280 fs/splice.c:1194
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+0x4fa/0xaa0 mm/page_alloc.c:2347
free_unref_page+0x33/0x3b0 mm/page_alloc.c:2487
__folio_put_small mm/swap.c:106 [inline]
__folio_put+0xc3/0x110 mm/swap.c:129
folio_put include/linux/mm.h:1483 [inline]
put_page include/linux/mm.h:1552 [inline]
free_page_and_swap_cache+0x25a/0x2d0 mm/swap_state.c:304
__tlb_remove_table arch/x86/include/asm/tlb.h:34 [inline]
__tlb_remove_table_free mm/mmu_gather.c:154 [inline]
tlb_remove_table_rcu+0x89/0xe0 mm/mmu_gather.c:209
rcu_do_batch kernel/rcu/tree.c:2158 [inline]
rcu_core+0x819/0x1680 kernel/rcu/tree.c:2431
__do_softirq+0x21a/0x8de kernel/softirq.c:553
Memory state around the buggy address:
ffff888052fa1200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888052fa1280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888052fa1300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888052fa1380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888052fa1400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
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If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 5254c0cbc92d Merge tag 'block-6.7-2023-12-22' of git://git..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1787afd6e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=314e9ad033a7d3a7
dashboard link: https://syzkaller.appspot.com/bug?extid=90e53b7760e544d1ce6a
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386
CC: [linux-...@vger.kernel.org linux-...@vger.kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-5254c0cb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/af866e4a884a/vmlinux-5254c0cb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2f31c4098f45/bzImage-5254c0cb.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+90e53b...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in hfs_bnode_unhash+0x1ba/0x1f0 fs/hfs/bnode.c:308
Read of size 8 at addr ffff888052fa1300 by task kswapd0/108
CPU: 0 PID: 108 Comm: kswapd0 Not tainted 6.7.0-rc6-syzkaller-00248-g5254c0cbc92d #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+0xd9/0x1b0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xc4/0x620 mm/kasan/report.c:475
kasan_report+0xda/0x110 mm/kasan/report.c:588
hfs_bnode_unhash+0x1ba/0x1f0 fs/hfs/bnode.c:308
hfs_release_folio+0x429/0x570 fs/hfs/inode.c:122
filemap_release_folio+0x1f1/0x270 mm/filemap.c:4076
shrink_folio_list+0x2991/0x3f00 mm/vmscan.c:1368
evict_folios+0x6e7/0x1b90 mm/vmscan.c:4499
try_to_shrink_lruvec+0x638/0xa10 mm/vmscan.c:4704
shrink_one+0x3e6/0x7a0 mm/vmscan.c:4743
shrink_many mm/vmscan.c:4808 [inline]
lru_gen_shrink_node mm/vmscan.c:4923 [inline]
shrink_node+0x211c/0x3710 mm/vmscan.c:5863
kswapd_shrink_node mm/vmscan.c:6668 [inline]
balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6858
kswapd+0x5be/0xbf0 mm/vmscan.c:7118
kthread+0x2c6/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
</TASK>
Allocated by task 30481:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:198 [inline]
__do_kmalloc_node mm/slab_common.c:1007 [inline]
__kmalloc+0x59/0x90 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:721 [inline]
__hfs_bnode_create+0x108/0x850 fs/hfs/bnode.c:259
hfs_bnode_find+0x2cf/0xcb0 fs/hfs/bnode.c:335
hfs_brec_find+0x2af/0x510 fs/hfs/bfind.c:126
hfs_brec_read+0x26/0x120 fs/hfs/bfind.c:165
hfs_lookup+0x205/0x320 fs/hfs/dir.c:32
lookup_open.isra.0+0x926/0x13b0 fs/namei.c:3455
open_last_lookups fs/namei.c:3546 [inline]
path_openat+0x922/0x2c50 fs/namei.c:3776
do_filp_open+0x1de/0x430 fs/namei.c:3809
do_sys_openat2+0x176/0x1e0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_creat fs/open.c:1528 [inline]
__se_sys_creat fs/open.c:1522 [inline]
__ia32_sys_creat+0xcc/0x120 fs/open.c:1522
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x62/0xe0 arch/x86/entry/common.c:321
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346
entry_SYSENTER_compat_after_hwframe+0x70/0x7a
Freed by task 31584:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1800 [inline]
slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826
slab_free mm/slub.c:3809 [inline]
__kmem_cache_free+0xc0/0x180 mm/slub.c:3822
hfs_btree_close+0xac/0x390 fs/hfs/btree.c:154
hfs_mdb_put+0xbf/0x380 fs/hfs/mdb.c:360
generic_shutdown_super+0x161/0x3d0 fs/super.c:696
kill_block_super+0x3b/0x90 fs/super.c:1667
deactivate_locked_super+0xbc/0x1a0 fs/super.c:484
deactivate_super+0xde/0x100 fs/super.c:517
cleanup_mnt+0x222/0x450 fs/namespace.c:1256
task_work_run+0x14d/0x240 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x217/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296
__do_fast_syscall_32+0x6f/0xe0 arch/x86/entry/common.c:324
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:346
entry_SYSENTER_compat_after_hwframe+0x70/0x7a
The buggy address belongs to the object at ffff888052fa1300
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 0 bytes inside of
freed 192-byte region [ffff888052fa1300, ffff888052fa13c0)
The buggy address belongs to the physical page:
page:ffffea00014be840 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x52fa1
flags: 0x4fff00000000800(slab|node=1|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 04fff00000000800 ffff888013042a00 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 15673, tgid 15671 (syz-executor.1), ts 882213308524, free_ts 881475117963
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1537
prep_new_page mm/page_alloc.c:1544 [inline]
get_page_from_freelist+0xa25/0x36d0 mm/page_alloc.c:3312
__alloc_pages+0x22e/0x2420 mm/page_alloc.c:4568
alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
alloc_slab_page mm/slub.c:1870 [inline]
allocate_slab mm/slub.c:2017 [inline]
new_slab+0x283/0x3c0 mm/slub.c:2070
___slab_alloc+0x979/0x1500 mm/slub.c:3223
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322
__slab_alloc_node mm/slub.c:3375 [inline]
slab_alloc_node mm/slub.c:3468 [inline]
__kmem_cache_alloc_node+0x131/0x310 mm/slub.c:3517
kmalloc_trace+0x25/0x60 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
__iomap_dio_rw+0x2a7/0x1bc0 fs/iomap/direct-io.c:563
iomap_dio_rw+0x40/0xa0 fs/iomap/direct-io.c:748
ext4_dio_read_iter fs/ext4/file.c:94 [inline]
ext4_file_read_iter+0x4dd/0x6c0 fs/ext4/file.c:145
call_read_iter include/linux/fs.h:2014 [inline]
copy_splice_read+0x418/0x8f0 fs/splice.c:364
vfs_splice_read fs/splice.c:992 [inline]
vfs_splice_read+0x2ea/0x3b0 fs/splice.c:962
splice_direct_to_actor+0x2a5/0xa30 fs/splice.c:1069
do_splice_direct+0x1af/0x280 fs/splice.c:1194
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+0x4fa/0xaa0 mm/page_alloc.c:2347
free_unref_page+0x33/0x3b0 mm/page_alloc.c:2487
__folio_put_small mm/swap.c:106 [inline]
__folio_put+0xc3/0x110 mm/swap.c:129
folio_put include/linux/mm.h:1483 [inline]
put_page include/linux/mm.h:1552 [inline]
free_page_and_swap_cache+0x25a/0x2d0 mm/swap_state.c:304
__tlb_remove_table arch/x86/include/asm/tlb.h:34 [inline]
__tlb_remove_table_free mm/mmu_gather.c:154 [inline]
tlb_remove_table_rcu+0x89/0xe0 mm/mmu_gather.c:209
rcu_do_batch kernel/rcu/tree.c:2158 [inline]
rcu_core+0x819/0x1680 kernel/rcu/tree.c:2431
__do_softirq+0x21a/0x8de kernel/softirq.c:553
Memory state around the buggy address:
ffff888052fa1200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888052fa1280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888052fa1300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888052fa1380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888052fa1400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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syzbot
Mar 22, 2024, 6:02:14 AMMar 22
to syzkaller-upst...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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