==================================================================
BUG: KASAN: use-after-free in memcpy_from_iter lib/iov_iter.c:73 [inline]
BUG: KASAN: use-after-free in iterate_bvec include/linux/iov_iter.h:122 [inline]
BUG: KASAN: use-after-free in iterate_and_advance2 include/linux/iov_iter.h:249 [inline]
BUG: KASAN: use-after-free in iterate_and_advance include/linux/iov_iter.h:271 [inline]
BUG: KASAN: use-after-free in __copy_from_iter lib/iov_iter.c:249 [inline]
BUG: KASAN: use-after-free in copy_page_from_iter_atomic+0x8bc/0x1170 lib/iov_iter.c:481
Read of size 4096 at addr ffff88807a2f1000 by task kworker/u8:8/1067
CPU: 1 UID: 0 PID: 1067 Comm: kworker/u8:8 Not tainted 6.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: loop2 loop_workfn
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119
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
__asan_memcpy+0x23/0x60 mm/kasan/shadow.c:105
memcpy_from_iter lib/iov_iter.c:73 [inline]
iterate_bvec include/linux/iov_iter.h:122 [inline]
iterate_and_advance2 include/linux/iov_iter.h:249 [inline]
iterate_and_advance include/linux/iov_iter.h:271 [inline]
__copy_from_iter lib/iov_iter.c:249 [inline]
copy_page_from_iter_atomic+0x8bc/0x1170 lib/iov_iter.c:481
copy_folio_from_iter_atomic include/linux/uio.h:186 [inline]
generic_perform_write+0x53d/0xaa0 mm/filemap.c:4032
shmem_file_write_iter+0x114/0x140 mm/shmem.c:3074
do_iter_readv_writev+0x534/0x800 fs/read_write.c:741
vfs_iter_write+0x1eb/0x9c0 fs/read_write.c:895
lo_write_bvec drivers/block/loop.c:243 [inline]
lo_write_simple drivers/block/loop.c:264 [inline]
do_req_filebacked drivers/block/loop.c:511 [inline]
loop_handle_cmd drivers/block/loop.c:1910 [inline]
loop_process_work+0x14dd/0x2000 drivers/block/loop.c:1945
process_one_work+0x9c8/0x1b40 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389
kthread+0x2c4/0x3a0 kernel/kthread.c:389
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88807a2f1dc0 pfn:0x7a2f1
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea00007ac3c8 ffffea00016b6bc8 0000000000000000
raw: ffff88807a2f1dc0 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x100dc0(GFP_USER|__GFP_ZERO), pid 5638, tgid 5637 (syz.2.114), ts 146633035926, free_ts 147545935761
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493
prep_new_page mm/page_alloc.c:1501 [inline]
get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3439
__alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4695
alloc_pages_mpol_noprof+0x275/0x610 mm/mempolicy.c:2263
lbmLogInit fs/jfs/jfs_logmgr.c:1816 [inline]
lmLogInit+0x4e3/0x1a90 fs/jfs/jfs_logmgr.c:1270
open_inline_log fs/jfs/jfs_logmgr.c:1175 [inline]
lmLogOpen+0x7e1/0x1400 fs/jfs/jfs_logmgr.c:1069
jfs_mount_rw+0x2ea/0x700 fs/jfs/jfs_mount.c:257
jfs_fill_super+0x9d6/0xd20 fs/jfs/super.c:565
mount_bdev+0x1e6/0x2d0 fs/super.c:1679
legacy_get_tree+0x10c/0x220 fs/fs_context.c:662
vfs_get_tree+0x92/0x380 fs/super.c:1800
do_new_mount fs/namespace.c:3472 [inline]
path_mount+0x14e6/0x1f20 fs/namespace.c:3799
do_mount fs/namespace.c:3812 [inline]
__do_sys_mount fs/namespace.c:4020 [inline]
__se_sys_mount fs/namespace.c:3997 [inline]
__x64_sys_mount+0x294/0x320 fs/namespace.c:3997
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
page last free pid 5224 tgid 5224 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1094 [inline]
free_unref_page+0x64a/0xe40 mm/page_alloc.c:2612
lbmLogShutdown fs/jfs/jfs_logmgr.c:1864 [inline]
lmLogShutdown+0x371/0x780 fs/jfs/jfs_logmgr.c:1684
lmLogClose+0x57b/0x710 fs/jfs/jfs_logmgr.c:1460
jfs_umount+0x2f0/0x440 fs/jfs/jfs_umount.c:114
jfs_put_super+0x88/0x1d0 fs/jfs/super.c:194
generic_shutdown_super+0x15c/0x3d0 fs/super.c:642
kill_block_super+0x3b/0x90 fs/super.c:1696
deactivate_locked_super+0xc1/0x1a0 fs/super.c:473
deactivate_super+0xde/0x100 fs/super.c:506
cleanup_mnt+0x222/0x450 fs/namespace.c:1373
task_work_run+0x151/0x250 kernel/task_work.c:228
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+0x27b/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88807a2f0f00: fc 00 00 00 00 00 00 00 00 00 fc fc fc fc 00 00
ffff88807a2f0f80: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
>ffff88807a2f1000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff88807a2f1080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88807a2f1100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 UID: 0 PID: 1067 Comm: kworker/u8:8 Tainted: G B 6.11.0-rc5-syzkaller #0
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: loop2 loop_workfn
RIP: 0010:fsnotify_parent include/linux/fsnotify.h:81 [inline]
RIP: 0010:fsnotify_file include/linux/fsnotify.h:131 [inline]
RIP: 0010:fsnotify_modify include/linux/fsnotify.h:388 [inline]
RIP: 0010:vfs_iter_write+0x42d/0x9c0 fs/read_write.c:897
Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 4d 05 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 74 24 68 49 8d 7e 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1f 05 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b
RSP: 0018:ffffc900041b7a48 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: ffff88807c826500 RCX: ffffffff81f8929c
RDX: 0000000000000005 RSI: ffffffff81f892aa RDI: 0000000000000028
RBP: 0000000000001000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 6e696c6261736944 R12: ffff888077d66d38
R13: ffff88807c826690 R14: 0000000000000000 R15: ffff88807c826550
FS: 0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3260dff8 CR3: 000000006ddca000 CR4: 0000000000350ef0
Call Trace:
<TASK>
lo_write_bvec drivers/block/loop.c:243 [inline]
lo_write_simple drivers/block/loop.c:264 [inline]
do_req_filebacked drivers/block/loop.c:511 [inline]
loop_handle_cmd drivers/block/loop.c:1910 [inline]
loop_process_work+0x14dd/0x2000 drivers/block/loop.c:1945
process_one_work+0x9c8/0x1b40 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389
kthread+0x2c4/0x3a0 kernel/kthread.c:389
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:fsnotify_parent include/linux/fsnotify.h:81 [inline]
RIP: 0010:fsnotify_file include/linux/fsnotify.h:131 [inline]
RIP: 0010:fsnotify_modify include/linux/fsnotify.h:388 [inline]
RIP: 0010:vfs_iter_write+0x42d/0x9c0 fs/read_write.c:897
Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 4d 05 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 74 24 68 49 8d 7e 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1f 05 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b
RSP: 0018:ffffc900041b7a48 EFLAGS: 00010216
RAX: dffffc0000000000 RBX: ffff88807c826500 RCX: ffffffff81f8929c
RDX: 0000000000000005 RSI: ffffffff81f892aa RDI: 0000000000000028
RBP: 0000000000001000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 6e696c6261736944 R12: ffff888077d66d38
R13: ffff88807c826690 R14: 0000000000000000 R15: ffff88807c826550
FS: 0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff9dea3b378 CR3: 000000001beea000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
0: 89 fa mov %edi,%edx
2: 48 c1 ea 03 shr $0x3,%rdx
6: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
a: 0f 85 4d 05 00 00 jne 0x55d
10: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
17: fc ff df
1a: 4d 8b 74 24 68 mov 0x68(%r12),%r14
1f: 49 8d 7e 28 lea 0x28(%r14),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 1f 05 00 00 jne 0x553
34: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
3b: fc ff df
3e: 4d rex.WRB
3f: 8b .byte 0x8b