* [syzbot] [mm?] KASAN: slab-use-after-free Read in folio_evictable (2)
@ 2024-06-15 16:32 syzbot
2024-06-17 2:19 ` Yu Zhao
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2024-06-15 16:32 UTC (permalink / raw)
To: akpm, linux-kernel, linux-mm, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: 2ef5971ff345 Merge tag 'vfs-6.10-rc4.fixes' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12873d96980000
kernel config: https://syzkaller.appspot.com/x/.config?x=81c0d76ceef02b39
dashboard link: https://syzkaller.appspot.com/bug?extid=12f0383f30f497b7f266
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386
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-2ef5971f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/85722ebc781d/vmlinux-2ef5971f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/27fd8bd02a1e/bzImage-2ef5971f.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+12f0383f30f497b7f266@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
BUG: KASAN: slab-use-after-free in mapping_unevictable include/linux/pagemap.h:259 [inline]
BUG: KASAN: slab-use-after-free in folio_evictable+0x7b/0x270 mm/internal.h:353
Read of size 8 at addr ffff88804b68ab18 by task kswapd0/111
CPU: 3 PID: 111 Comm: kswapd0 Not tainted 6.10.0-rc3-syzkaller-00021-g2ef5971ff345 #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
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
mapping_unevictable include/linux/pagemap.h:259 [inline]
folio_evictable+0x7b/0x270 mm/internal.h:353
sort_folio mm/vmscan.c:4259 [inline]
scan_folios mm/vmscan.c:4385 [inline]
isolate_folios+0xdc0/0x3e90 mm/vmscan.c:4510
evict_folios+0x1a2/0x1bf0 mm/vmscan.c:4541
try_to_shrink_lruvec+0x618/0x9b0 mm/vmscan.c:4749
shrink_one+0x3f8/0x7c0 mm/vmscan.c:4788
shrink_many mm/vmscan.c:4851 [inline]
lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4951
shrink_node mm/vmscan.c:5910 [inline]
kswapd_shrink_node mm/vmscan.c:6720 [inline]
balance_pgdat+0x1105/0x1970 mm/vmscan.c:6911
kswapd+0x5ea/0xbf0 mm/vmscan.c:7180
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Allocated by task 11159:
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:3941 [inline]
slab_alloc_node mm/slub.c:4001 [inline]
kmem_cache_alloc_lru_noprof+0x121/0x2f0 mm/slub.c:4020
nilfs_alloc_inode+0x26/0x150 fs/nilfs2/super.c:154
alloc_inode+0x5d/0x230 fs/inode.c:261
iget5_locked fs/inode.c:1235 [inline]
iget5_locked+0x1c9/0x2c0 fs/inode.c:1228
nilfs_iget_locked+0xa1/0xe0 fs/nilfs2/inode.c:606
nilfs_ifile_read+0x2f/0x1e0 fs/nilfs2/ifile.c:192
nilfs_attach_checkpoint+0x12d/0x1d0 fs/nilfs2/super.c:557
nilfs_fill_super fs/nilfs2/super.c:1067 [inline]
nilfs_get_tree+0x951/0x1000 fs/nilfs2/super.c:1211
vfs_get_tree+0x8f/0x380 fs/super.c:1780
do_new_mount fs/namespace.c:3352 [inline]
path_mount+0x6e1/0x1f10 fs/namespace.c:3679
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount fs/namespace.c:3875 [inline]
__ia32_sys_mount+0x295/0x320 fs/namespace.c:3875
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
Freed by task 111:
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+0xf7/0x160 mm/kasan/common.c:240
__kasan_slab_free+0x32/0x50 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2196 [inline]
slab_free mm/slub.c:4437 [inline]
kmem_cache_free+0x12f/0x3a0 mm/slub.c:4512
i_callback+0x43/0x70 fs/inode.c:250
rcu_do_batch kernel/rcu/tree.c:2535 [inline]
rcu_core+0x828/0x16b0 kernel/rcu/tree.c:2809
handle_softirqs+0x216/0x8f0 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu kernel/softirq.c:637 [inline]
irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Last potentially related work creation:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
__kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541
__call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:3072
destroy_inode+0x12c/0x1b0 fs/inode.c:316
iput_final fs/inode.c:1741 [inline]
iput.part.0+0x5a8/0x7f0 fs/inode.c:1767
iput+0x5c/0x80 fs/inode.c:1757
nilfs_put_root+0xae/0xe0 fs/nilfs2/the_nilfs.c:925
nilfs_segctor_destroy fs/nilfs2/segment.c:2788 [inline]
nilfs_detach_log_writer+0x5ef/0xaa0 fs/nilfs2/segment.c:2850
nilfs_put_super+0x43/0x1b0 fs/nilfs2/super.c:498
generic_shutdown_super+0x159/0x3d0 fs/super.c:642
kill_block_super+0x3b/0x90 fs/super.c:1676
deactivate_locked_super+0xbe/0x1a0 fs/super.c:473
deactivate_super+0xde/0x100 fs/super.c:506
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_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:389
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
The buggy address belongs to the object at ffff88804b68a670
which belongs to the cache nilfs2_inode_cache of size 1512
The buggy address is located 1192 bytes inside of
freed 1512-byte region [ffff88804b68a670, ffff88804b68ac58)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804b68acd8 pfn:0x4b688
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888058e37301
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: 0xffffefff(slab)
raw: 04fff00000000040 ffff88801b6f6280 dead000000000122 0000000000000000
raw: ffff88804b68acd8 0000000080130007 00000001ffffefff ffff888058e37301
head: 04fff00000000040 ffff88801b6f6280 dead000000000122 0000000000000000
head: ffff88804b68acd8 0000000080130007 00000001ffffefff ffff888058e37301
head: 04fff00000000003 ffffea00012da201 ffffffffffffffff 0000000000000000
head: ffff888000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 6572, tgid 6570 (syz-executor.2), ts 100418694148, free_ts 93623440891
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1468
prep_new_page mm/page_alloc.c:1476 [inline]
get_page_from_freelist+0x136a/0x2e50 mm/page_alloc.c:3420
__alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4678
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
alloc_slab_page+0x56/0x110 mm/slub.c:2265
allocate_slab mm/slub.c:2428 [inline]
new_slab+0x84/0x260 mm/slub.c:2481
___slab_alloc+0xdac/0x1870 mm/slub.c:3667
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3757
__slab_alloc_node mm/slub.c:3810 [inline]
slab_alloc_node mm/slub.c:3989 [inline]
kmem_cache_alloc_lru_noprof+0x2a7/0x2f0 mm/slub.c:4020
nilfs_alloc_inode+0x26/0x150 fs/nilfs2/super.c:154
alloc_inode+0x5d/0x230 fs/inode.c:261
iget5_locked fs/inode.c:1235 [inline]
iget5_locked+0x1c9/0x2c0 fs/inode.c:1228
nilfs_iget_for_shadow+0xe4/0x2f0 fs/nilfs2/inode.c:742
nilfs_mdt_setup_shadow_map+0x8c/0x150 fs/nilfs2/mdt.c:523
nilfs_dat_read+0x26d/0x360 fs/nilfs2/dat.c:525
nilfs_load_super_root fs/nilfs2/the_nilfs.c:120 [inline]
load_nilfs+0x399/0x12e0 fs/nilfs2/the_nilfs.c:301
nilfs_fill_super fs/nilfs2/super.c:1062 [inline]
nilfs_get_tree+0x8c9/0x1000 fs/nilfs2/super.c:1211
page last free pid 5216 tgid 5216 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1088 [inline]
free_unref_page+0x64a/0xe40 mm/page_alloc.c:2583
__put_partials+0x14c/0x170 mm/slub.c:2995
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:3941 [inline]
slab_alloc_node mm/slub.c:4001 [inline]
kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4008
getname_flags.part.0+0x50/0x4f0 fs/namei.c:139
getname_flags include/linux/audit.h:322 [inline]
getname+0x8f/0xe0 fs/namei.c:218
do_sys_openat2+0x104/0x1e0 fs/open.c:1399
do_sys_open fs/open.c:1420 [inline]
__do_sys_openat fs/open.c:1436 [inline]
__se_sys_openat fs/open.c:1431 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1431
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88804b68aa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804b68aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88804b68ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88804b68ab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804b68ac00: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
==================================================================
---
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [mm?] KASAN: slab-use-after-free Read in folio_evictable (2)
2024-06-15 16:32 [syzbot] [mm?] KASAN: slab-use-after-free Read in folio_evictable (2) syzbot
@ 2024-06-17 2:19 ` Yu Zhao
2024-06-17 18:12 ` Shakeel Butt
0 siblings, 1 reply; 3+ messages in thread
From: Yu Zhao @ 2024-06-17 2:19 UTC (permalink / raw)
To: syzbot; +Cc: akpm, linux-kernel, linux-mm, syzkaller-bugs
On Sat, Jun 15, 2024 at 11:42 AM syzbot
<syzbot+12f0383f30f497b7f266@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 2ef5971ff345 Merge tag 'vfs-6.10-rc4.fixes' of git://git.k..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=12873d96980000
> kernel config: https://syzkaller.appspot.com/x/.config?x=81c0d76ceef02b39
> dashboard link: https://syzkaller.appspot.com/bug?extid=12f0383f30f497b7f266
> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> userspace arch: i386
>
> 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-2ef5971f.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/85722ebc781d/vmlinux-2ef5971f.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/27fd8bd02a1e/bzImage-2ef5971f.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+12f0383f30f497b7f266@syzkaller.appspotmail.com
>
> ==================================================================
> BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]
> BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
> BUG: KASAN: slab-use-after-free in mapping_unevictable include/linux/pagemap.h:259 [inline]
> BUG: KASAN: slab-use-after-free in folio_evictable+0x7b/0x270 mm/internal.h:353
> Read of size 8 at addr ffff88804b68ab18 by task kswapd0/111
>
> CPU: 3 PID: 111 Comm: kswapd0 Not tainted 6.10.0-rc3-syzkaller-00021-g2ef5971ff345 #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
> check_region_inline mm/kasan/generic.c:183 [inline]
> kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189
> instrument_atomic_read include/linux/instrumented.h:68 [inline]
> _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
> mapping_unevictable include/linux/pagemap.h:259 [inline]
The memory folio->mapping pointed to was RCU freed and
mapping_unevictable() was under the RCU read lock.
So probably the owner of that folio forgot to clear the mapping?
> folio_evictable+0x7b/0x270 mm/internal.h:353
> sort_folio mm/vmscan.c:4259 [inline]
> scan_folios mm/vmscan.c:4385 [inline]
> isolate_folios+0xdc0/0x3e90 mm/vmscan.c:4510
> evict_folios+0x1a2/0x1bf0 mm/vmscan.c:4541
> try_to_shrink_lruvec+0x618/0x9b0 mm/vmscan.c:4749
> shrink_one+0x3f8/0x7c0 mm/vmscan.c:4788
> shrink_many mm/vmscan.c:4851 [inline]
> lru_gen_shrink_node+0x89f/0x1750 mm/vmscan.c:4951
> shrink_node mm/vmscan.c:5910 [inline]
> kswapd_shrink_node mm/vmscan.c:6720 [inline]
> balance_pgdat+0x1105/0x1970 mm/vmscan.c:6911
> kswapd+0x5ea/0xbf0 mm/vmscan.c:7180
> kthread+0x2c1/0x3a0 kernel/kthread.c:389
> ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
> ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
> </TASK>
>
> Allocated by task 11159:
> 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:3941 [inline]
> slab_alloc_node mm/slub.c:4001 [inline]
> kmem_cache_alloc_lru_noprof+0x121/0x2f0 mm/slub.c:4020
> nilfs_alloc_inode+0x26/0x150 fs/nilfs2/super.c:154
> alloc_inode+0x5d/0x230 fs/inode.c:261
> iget5_locked fs/inode.c:1235 [inline]
> iget5_locked+0x1c9/0x2c0 fs/inode.c:1228
> nilfs_iget_locked+0xa1/0xe0 fs/nilfs2/inode.c:606
> nilfs_ifile_read+0x2f/0x1e0 fs/nilfs2/ifile.c:192
> nilfs_attach_checkpoint+0x12d/0x1d0 fs/nilfs2/super.c:557
> nilfs_fill_super fs/nilfs2/super.c:1067 [inline]
> nilfs_get_tree+0x951/0x1000 fs/nilfs2/super.c:1211
> vfs_get_tree+0x8f/0x380 fs/super.c:1780
> do_new_mount fs/namespace.c:3352 [inline]
> path_mount+0x6e1/0x1f10 fs/namespace.c:3679
> do_mount fs/namespace.c:3692 [inline]
> __do_sys_mount fs/namespace.c:3898 [inline]
> __se_sys_mount fs/namespace.c:3875 [inline]
> __ia32_sys_mount+0x295/0x320 fs/namespace.c:3875
> do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
> __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
> do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
> entry_SYSENTER_compat_after_hwframe+0x84/0x8e
>
> Freed by task 111:
> 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+0xf7/0x160 mm/kasan/common.c:240
> __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256
> kasan_slab_free include/linux/kasan.h:184 [inline]
> slab_free_hook mm/slub.c:2196 [inline]
> slab_free mm/slub.c:4437 [inline]
> kmem_cache_free+0x12f/0x3a0 mm/slub.c:4512
> i_callback+0x43/0x70 fs/inode.c:250
> rcu_do_batch kernel/rcu/tree.c:2535 [inline]
> rcu_core+0x828/0x16b0 kernel/rcu/tree.c:2809
> handle_softirqs+0x216/0x8f0 kernel/softirq.c:554
> __do_softirq kernel/softirq.c:588 [inline]
> invoke_softirq kernel/softirq.c:428 [inline]
> __irq_exit_rcu kernel/softirq.c:637 [inline]
> irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649
> instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
> sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043
> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
>
> Last potentially related work creation:
> kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
> __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541
> __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:3072
> destroy_inode+0x12c/0x1b0 fs/inode.c:316
> iput_final fs/inode.c:1741 [inline]
> iput.part.0+0x5a8/0x7f0 fs/inode.c:1767
> iput+0x5c/0x80 fs/inode.c:1757
> nilfs_put_root+0xae/0xe0 fs/nilfs2/the_nilfs.c:925
> nilfs_segctor_destroy fs/nilfs2/segment.c:2788 [inline]
> nilfs_detach_log_writer+0x5ef/0xaa0 fs/nilfs2/segment.c:2850
> nilfs_put_super+0x43/0x1b0 fs/nilfs2/super.c:498
> generic_shutdown_super+0x159/0x3d0 fs/super.c:642
> kill_block_super+0x3b/0x90 fs/super.c:1676
> deactivate_locked_super+0xbe/0x1a0 fs/super.c:473
> deactivate_super+0xde/0x100 fs/super.c:506
> 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_fast_syscall_32+0x80/0x120 arch/x86/entry/common.c:389
> do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
> entry_SYSENTER_compat_after_hwframe+0x84/0x8e
>
> The buggy address belongs to the object at ffff88804b68a670
> which belongs to the cache nilfs2_inode_cache of size 1512
> The buggy address is located 1192 bytes inside of
> freed 1512-byte region [ffff88804b68a670, ffff88804b68ac58)
>
> The buggy address belongs to the physical page:
> page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804b68acd8 pfn:0x4b688
> head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
> memcg:ffff888058e37301
> flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
> page_type: 0xffffefff(slab)
> raw: 04fff00000000040 ffff88801b6f6280 dead000000000122 0000000000000000
> raw: ffff88804b68acd8 0000000080130007 00000001ffffefff ffff888058e37301
> head: 04fff00000000040 ffff88801b6f6280 dead000000000122 0000000000000000
> head: ffff88804b68acd8 0000000080130007 00000001ffffefff ffff888058e37301
> head: 04fff00000000003 ffffea00012da201 ffffffffffffffff 0000000000000000
> head: ffff888000000008 0000000000000000 00000000ffffffff 0000000000000000
> page dumped because: kasan: bad access detected
> page_owner tracks the page as allocated
> page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 6572, tgid 6570 (syz-executor.2), ts 100418694148, free_ts 93623440891
> set_page_owner include/linux/page_owner.h:32 [inline]
> post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1468
> prep_new_page mm/page_alloc.c:1476 [inline]
> get_page_from_freelist+0x136a/0x2e50 mm/page_alloc.c:3420
> __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4678
> __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
> alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
> alloc_slab_page+0x56/0x110 mm/slub.c:2265
> allocate_slab mm/slub.c:2428 [inline]
> new_slab+0x84/0x260 mm/slub.c:2481
> ___slab_alloc+0xdac/0x1870 mm/slub.c:3667
> __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3757
> __slab_alloc_node mm/slub.c:3810 [inline]
> slab_alloc_node mm/slub.c:3989 [inline]
> kmem_cache_alloc_lru_noprof+0x2a7/0x2f0 mm/slub.c:4020
> nilfs_alloc_inode+0x26/0x150 fs/nilfs2/super.c:154
> alloc_inode+0x5d/0x230 fs/inode.c:261
> iget5_locked fs/inode.c:1235 [inline]
> iget5_locked+0x1c9/0x2c0 fs/inode.c:1228
> nilfs_iget_for_shadow+0xe4/0x2f0 fs/nilfs2/inode.c:742
> nilfs_mdt_setup_shadow_map+0x8c/0x150 fs/nilfs2/mdt.c:523
> nilfs_dat_read+0x26d/0x360 fs/nilfs2/dat.c:525
> nilfs_load_super_root fs/nilfs2/the_nilfs.c:120 [inline]
> load_nilfs+0x399/0x12e0 fs/nilfs2/the_nilfs.c:301
> nilfs_fill_super fs/nilfs2/super.c:1062 [inline]
> nilfs_get_tree+0x8c9/0x1000 fs/nilfs2/super.c:1211
> page last free pid 5216 tgid 5216 stack trace:
> reset_page_owner include/linux/page_owner.h:25 [inline]
> free_pages_prepare mm/page_alloc.c:1088 [inline]
> free_unref_page+0x64a/0xe40 mm/page_alloc.c:2583
> __put_partials+0x14c/0x170 mm/slub.c:2995
> 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:3941 [inline]
> slab_alloc_node mm/slub.c:4001 [inline]
> kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4008
> getname_flags.part.0+0x50/0x4f0 fs/namei.c:139
> getname_flags include/linux/audit.h:322 [inline]
> getname+0x8f/0xe0 fs/namei.c:218
> do_sys_openat2+0x104/0x1e0 fs/open.c:1399
> do_sys_open fs/open.c:1420 [inline]
> __do_sys_openat fs/open.c:1436 [inline]
> __se_sys_openat fs/open.c:1431 [inline]
> __x64_sys_openat+0x175/0x210 fs/open.c:1431
> do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Memory state around the buggy address:
> ffff88804b68aa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88804b68aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >ffff88804b68ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ^
> ffff88804b68ab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88804b68ac00: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
> ==================================================================
>
>
> ---
> 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 syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [mm?] KASAN: slab-use-after-free Read in folio_evictable (2)
2024-06-17 2:19 ` Yu Zhao
@ 2024-06-17 18:12 ` Shakeel Butt
0 siblings, 0 replies; 3+ messages in thread
From: Shakeel Butt @ 2024-06-17 18:12 UTC (permalink / raw)
To: Yu Zhao; +Cc: syzbot, akpm, linux-kernel, linux-mm, syzkaller-bugs
On Sun, Jun 16, 2024 at 08:19:59PM GMT, Yu Zhao wrote:
> On Sat, Jun 15, 2024 at 11:42 AM syzbot
> <syzbot+12f0383f30f497b7f266@syzkaller.appspotmail.com> wrote:
> >
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit: 2ef5971ff345 Merge tag 'vfs-6.10-rc4.fixes' of git://git.k..
> > git tree: upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=12873d96980000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=81c0d76ceef02b39
> > dashboard link: https://syzkaller.appspot.com/bug?extid=12f0383f30f497b7f266
> > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> > userspace arch: i386
> >
> > 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-2ef5971f.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/85722ebc781d/vmlinux-2ef5971f.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/27fd8bd02a1e/bzImage-2ef5971f.xz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+12f0383f30f497b7f266@syzkaller.appspotmail.com
> >
> > ==================================================================
> > BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]
> > BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
> > BUG: KASAN: slab-use-after-free in mapping_unevictable include/linux/pagemap.h:259 [inline]
> > BUG: KASAN: slab-use-after-free in folio_evictable+0x7b/0x270 mm/internal.h:353
> > Read of size 8 at addr ffff88804b68ab18 by task kswapd0/111
> >
> > CPU: 3 PID: 111 Comm: kswapd0 Not tainted 6.10.0-rc3-syzkaller-00021-g2ef5971ff345 #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
> > check_region_inline mm/kasan/generic.c:183 [inline]
> > kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189
> > instrument_atomic_read include/linux/instrumented.h:68 [inline]
> > _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
> > mapping_unevictable include/linux/pagemap.h:259 [inline]
>
> The memory folio->mapping pointed to was RCU freed and
> mapping_unevictable() was under the RCU read lock.
>
> So probably the owner of that folio forgot to clear the mapping?
>
This seems like duplicate of another syzbot report at
https://lore.kernel.org/all/0000000000008874480617ff1bad@google.com/T/
and https://lore.kernel.org/all/20240614131856.754-1-hdanton@sina.com/T/
#syz dup: [syzbot] [mm?] KASAN: slab-use-after-free Read in lru_add_fn
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2024-06-17 18:12 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2024-06-15 16:32 [syzbot] [mm?] KASAN: slab-use-after-free Read in folio_evictable (2) syzbot
2024-06-17 2:19 ` Yu Zhao
2024-06-17 18:12 ` Shakeel Butt
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