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Message-ID: <66ed861a.050a0220.2abe4d.0015.GAE@google.com>
Date: Fri, 20 Sep 2024 07:26:34 -0700
From: syzbot <syzbot+7c48153a9d788824044b@...kaller.appspotmail.com>
To: brauner@...nel.org, dhowells@...hat.com, jlayton@...nel.org,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org, mathieu.desnoyers@...icios.com,
mhiramat@...nel.org, netfs@...ts.linux.dev, rostedt@...dmis.org,
syzkaller-bugs@...glegroups.com
Subject: [syzbot] [netfs?] KASAN: slab-use-after-free Read in iov_iter_advance
Hello,
syzbot found the following issue on:
HEAD commit: a430d95c5efa Merge tag 'lsm-pr-20240911' of git://git.kern..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=15b24427980000
kernel config: https://syzkaller.appspot.com/x/.config?x=d85e1e571a820894
dashboard link: https://syzkaller.appspot.com/bug?extid=7c48153a9d788824044b
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1511a607980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10c7d69f980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4faaa939b3a4/disk-a430d95c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/83c722076440/vmlinux-a430d95c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/24c938d49c40/bzImage-a430d95c.xz
The issue was bisected to:
commit 983cdcf8fe141b0ce16bc71959a5dc55bcb0764d
Author: David Howells <dhowells@...hat.com>
Date: Thu Jun 6 06:48:55 2024 +0000
netfs: Simplify the writeback code
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1087bb00580000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1287bb00580000
console output: https://syzkaller.appspot.com/x/log.txt?x=1487bb00580000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7c48153a9d788824044b@...kaller.appspotmail.com
Fixes: 983cdcf8fe14 ("netfs: Simplify the writeback code")
==================================================================
BUG: KASAN: slab-use-after-free in iov_iter_folioq_advance lib/iov_iter.c:540 [inline]
BUG: KASAN: slab-use-after-free in iov_iter_advance+0x677/0x6c0 lib/iov_iter.c:576
Read of size 8 at addr ffff88802a63dd20 by task syz-executor341/5249
CPU: 1 UID: 0 PID: 5249 Comm: syz-executor341 Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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
iov_iter_folioq_advance lib/iov_iter.c:540 [inline]
iov_iter_advance+0x677/0x6c0 lib/iov_iter.c:576
netfs_write_folio+0x745/0x18f0 fs/netfs/write_issue.c:481
netfs_writepages+0x2ba/0xb90 fs/netfs/write_issue.c:541
do_writepages+0x1a6/0x7f0 mm/page-writeback.c:2683
filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387
__filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430
v9fs_dir_release+0x429/0x590 fs/9p/vfs_dir.c:219
__fput+0x3f9/0xb60 fs/file_table.c:431
task_work_run+0x151/0x250 kernel/task_work.c:228
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xaa3/0x2bb0 kernel/exit.c:882
do_group_exit+0xd3/0x2a0 kernel/exit.c:1031
__do_sys_exit_group kernel/exit.c:1042 [inline]
__se_sys_exit_group kernel/exit.c:1040 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1040
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
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
RIP: 0033:0x7ff0e2c14089
Code: Unable to access opcode bytes at 0x7ff0e2c1405f.
RSP: 002b:00007ffe69e64ba8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff0e2c14089
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 00007ff0e2c8f390 R08: ffffffffffffffb8 R09: 0000000000000006
R10: 000000007ffff000 R11: 0000000000000246 R12: 00007ff0e2c8f390
R13: 0000000000000000 R14: 00007ff0e2c8fde0 R15: 00007ff0e2be5070
</TASK>
Allocated by task 5249:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
kmalloc_noprof include/linux/slab.h:690 [inline]
netfs_buffer_append_folio+0x181/0x750 fs/netfs/misc.c:25
netfs_write_folio+0x542/0x18f0 fs/netfs/write_issue.c:421
netfs_writepages+0x2ba/0xb90 fs/netfs/write_issue.c:541
do_writepages+0x1a6/0x7f0 mm/page-writeback.c:2683
filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387
__filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430
v9fs_dir_release+0x429/0x590 fs/9p/vfs_dir.c:219
__fput+0x3f9/0xb60 fs/file_table.c:431
task_work_run+0x151/0x250 kernel/task_work.c:228
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xaa3/0x2bb0 kernel/exit.c:882
do_group_exit+0xd3/0x2a0 kernel/exit.c:1031
__do_sys_exit_group kernel/exit.c:1042 [inline]
__se_sys_exit_group kernel/exit.c:1040 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1040
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
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
Freed by task 12:
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:2250 [inline]
slab_free mm/slub.c:4474 [inline]
kfree+0x12a/0x3b0 mm/slub.c:4595
netfs_delete_buffer_head+0xa6/0x100 fs/netfs/misc.c:59
netfs_writeback_unlock_folios fs/netfs/write_collect.c:139 [inline]
netfs_collect_write_results fs/netfs/write_collect.c:493 [inline]
netfs_write_collection_worker+0x20f9/0x4f80 fs/netfs/write_collect.c:551
process_one_work+0x9c8/0x1b40 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3393
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
The buggy address belongs to the object at ffff88802a63dc00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 288 bytes inside of
freed 512-byte region [ffff88802a63dc00, ffff88802a63de00)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a63c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000040 ffff88801ac41c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000
head: 00fff00000000040 ffff88801ac41c80 dead000000000122 0000000000000000
head: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000
head: 00fff00000000002 ffffea0000a98f01 ffffffffffffffff 0000000000000000
head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5249, tgid 5249 (syz-executor341), ts 139218928620, free_ts 130646507944
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1500
prep_new_page mm/page_alloc.c:1508 [inline]
get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3446
__alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4702
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
alloc_slab_page+0x4e/0xf0 mm/slub.c:2319
allocate_slab mm/slub.c:2482 [inline]
new_slab+0x84/0x260 mm/slub.c:2535
___slab_alloc+0xdac/0x1870 mm/slub.c:3721
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3811
__slab_alloc_node mm/slub.c:3864 [inline]
slab_alloc_node mm/slub.c:4026 [inline]
__kmalloc_cache_noprof+0x2b4/0x300 mm/slub.c:4185
kmalloc_noprof include/linux/slab.h:690 [inline]
netfs_buffer_append_folio+0x181/0x750 fs/netfs/misc.c:25
netfs_write_folio+0x542/0x18f0 fs/netfs/write_issue.c:421
netfs_writepages+0x2ba/0xb90 fs/netfs/write_issue.c:541
do_writepages+0x1a6/0x7f0 mm/page-writeback.c:2683
filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387
__filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430
v9fs_dir_release+0x429/0x590 fs/9p/vfs_dir.c:219
__fput+0x3f9/0xb60 fs/file_table.c:431
page last free pid 4682 tgid 4682 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1101 [inline]
free_unref_page+0x64a/0xe40 mm/page_alloc.c:2619
__put_partials+0x14c/0x170 mm/slub.c:3049
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:3989 [inline]
slab_alloc_node mm/slub.c:4038 [inline]
kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4045
getname_flags.part.0+0x4c/0x550 fs/namei.c:139
getname_flags+0x93/0xf0 include/linux/audit.h:322
vfs_fstatat+0x86/0x160 fs/stat.c:340
__do_sys_newfstatat+0xa2/0x130 fs/stat.c:505
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:
ffff88802a63dc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802a63dc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802a63dd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802a63dd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802a63de00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in iov_iter_folioq_advance lib/iov_iter.c:540 [inline]
BUG: KASAN: slab-use-after-free in iov_iter_advance+0x677/0x6c0 lib/iov_iter.c:576
Read of size 8 at addr ffff88802a63f520 by task syz-executor341/5249
CPU: 1 UID: 0 PID: 5249 Comm: syz-executor341 Tainted: G B 6.11.0-syzkaller-02574-ga430d95c5efa #0
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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
iov_iter_folioq_advance lib/iov_iter.c:540 [inline]
iov_iter_advance+0x677/0x6c0 lib/iov_iter.c:576
netfs_write_folio+0x745/0x18f0 fs/netfs/write_issue.c:481
netfs_writepages+0x2ba/0xb90 fs/netfs/write_issue.c:541
do_writepages+0x1a6/0x7f0 mm/page-writeback.c:2683
filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387
__filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430
v9fs_dir_release+0x429/0x590 fs/9p/vfs_dir.c:219
__fput+0x3f9/0xb60 fs/file_table.c:431
task_work_run+0x151/0x250 kernel/task_work.c:228
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xaa3/0x2bb0 kernel/exit.c:882
do_group_exit+0xd3/0x2a0 kernel/exit.c:1031
__do_sys_exit_group kernel/exit.c:1042 [inline]
__se_sys_exit_group kernel/exit.c:1040 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1040
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
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
RIP: 0033:0x7ff0e2c14089
Code: Unable to access opcode bytes at 0x7ff0e2c1405f.
RSP: 002b:00007ffe69e64ba8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff0e2c14089
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 00007ff0e2c8f390 R08: ffffffffffffffb8 R09: 0000000000000006
R10: 000000007ffff000 R11: 0000000000000246 R12: 00007ff0e2c8f390
R13: 0000000000000000 R14: 00007ff0e2c8fde0 R15: 00007ff0e2be5070
</TASK>
Allocated by task 5249:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
kmalloc_noprof include/linux/slab.h:690 [inline]
netfs_buffer_append_folio+0x181/0x750 fs/netfs/misc.c:25
netfs_write_folio+0x542/0x18f0 fs/netfs/write_issue.c:421
netfs_writepages+0x2ba/0xb90 fs/netfs/write_issue.c:541
do_writepages+0x1a6/0x7f0 mm/page-writeback.c:2683
filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387
__filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430
v9fs_dir_release+0x429/0x590 fs/9p/vfs_dir.c:219
__fput+0x3f9/0xb60 fs/file_table.c:431
task_work_run+0x151/0x250 kernel/task_work.c:228
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xaa3/0x2bb0 kernel/exit.c:882
do_group_exit+0xd3/0x2a0 kernel/exit.c:1031
__do_sys_exit_group kernel/exit.c:1042 [inline]
__se_sys_exit_group kernel/exit.c:1040 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1040
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
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
Freed by task 12:
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:2250 [inline]
slab_free mm/slub.c:4474 [inline]
kfree+0x12a/0x3b0 mm/slub.c:4595
netfs_delete_buffer_head+0xa6/0x100 fs/netfs/misc.c:59
netfs_writeback_unlock_folios fs/netfs/write_collect.c:139 [inline]
netfs_collect_write_results fs/netfs/write_collect.c:493 [inline]
netfs_write_collection_worker+0x20f9/0x4f80 fs/netfs/write_collect.c:551
process_one_work+0x9c8/0x1b40 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3393
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
The buggy address belongs to the object at ffff88802a63f400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 288 bytes inside of
freed 512-byte region [ffff88802a63f400, ffff88802a63f600)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a63c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000040 ffff88801ac41c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000
head: 00fff00000000040 ffff88801ac41c80 dead000000000122 0000000000000000
head: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000
head: 00fff00000000002 ffffea0000a98f01 ffffffffffffffff 0000000000000000
head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5249, tgid 5249 (syz-executor341), ts 139218928620, free_ts 130646507944
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1500
prep_new_page mm/page_alloc.c:1508 [inline]
get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3446
__alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4702
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
alloc_slab_page+0x4e/0xf0 mm/slub.c:2319
allocate_slab mm/slub.c:2482 [inline]
new_slab+0x84/0x260 mm/slub.c:2535
___slab_alloc+0xdac/0x1870 mm/slub.c:3721
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3811
__slab_alloc_node mm/slub.c:3864 [inline]
slab_alloc_node mm/slub.c:4026 [inline]
__kmalloc_cache_noprof+0x2b4/0x300 mm/slub.c:4185
kmalloc_noprof include/linux/slab.h:690 [inline]
netfs_buffer_append_folio+0x181/0x750 fs/netfs/misc.c:25
netfs_write_folio+0x542/0x18f0 fs/netfs/write_issue.c:421
netfs_writepages+0x2ba/0xb90 fs/netfs/write_issue.c:541
do_writepages+0x1a6/0x7f0 mm/page-writeback.c:2683
filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387
__filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430
v9fs_dir_release+0x429/0x590 fs/9p/vfs_dir.c:219
__fput+0x3f9/0xb60 fs/file_table.c:431
page last free pid 4682 tgid 4682 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1101 [inline]
free_unref_page+0x64a/0xe40 mm/page_alloc.c:2619
__put_partials+0x14c/0x170 mm/slub.c:3049
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:3989 [inline]
slab_alloc_node mm/slub.c:4038 [inline]
kmem_cache_alloc_noprof+0x121/0x2f0 mm/slub.c:4045
getname_flags.part.0+0x4c/0x550 fs/namei.c:139
getname_flags+0x93/0xf0 include/linux/audit.h:322
vfs_fstatat+0x86/0x160 fs/stat.c:340
__do_sys_newfstatat+0xa2/0x130 fs/stat.c:505
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:
ffff88802a63f400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802a63f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802a63f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802a63f580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802a63f600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
==================================================================
BUG: KASAN: slab-use-after-free in iov_iter_folioq_advance lib/iov_iter.c:540 [inline]
BUG: KASAN: slab-use-after-free in iov_iter_advance+0x677/0x6c0 lib/iov_iter.c:576
Read of size 8 at addr ffff88802c8aad20 by task syz-executor341/5249
CPU: 1 UID: 0 PID: 5249 Comm: syz-executor341 Tainted: G B 6.11.0-syzkaller-02574-ga430d95c5efa #0
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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
iov_iter_folioq_advance lib/iov_iter.c:540 [inline]
iov_iter_advance+0x677/0x6c0 lib/iov_iter.c:576
netfs_write_folio+0x745/0x18f0 fs/netfs/write_issue.c:481
netfs_writepages+0x2ba/0xb90 fs/netfs/write_issue.c:541
do_writepages+0x1a6/0x7f0 mm/page-writeback.c:2683
filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387
__filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430
v9fs_dir_release+0x429/0x590 fs/9p/vfs_dir.c:219
__fput+0x3f9/0xb60 fs/file_table.c:431
task_work_run+0x151/0x250 kernel/task_work.c:228
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xaa3/0x2bb0 kernel/exit.c:882
do_group_exit+0xd3/0x2a0 kernel/exit.c:1031
__do_sys_exit_group kernel/exit.c:1042 [inline]
__se_sys_exit_group kernel/exit.c:1040 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1040
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
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
RIP: 0033:0x7ff0e2c14089
Code: Unable to access opcode bytes at 0x7ff0e2c1405f.
RSP: 002b:00007ffe69e64ba8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff0e2c14089
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 00007ff0e2c8f390 R08: ffffffffffffffb8 R09: 0000000000000006
R10: 000000007ffff000 R11: 0000000000000246 R12: 00007ff0e2c8f390
R13: 0000000000000000 R14: 00007ff0e2c8fde0 R15: 00007ff0e2be5070
</TASK>
Allocated by task 5249:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
kmalloc_noprof include/linux/slab.h:690 [inline]
netfs_buffer_append_folio+0x181/0x750 fs/netfs/misc.c:25
netfs_write_folio+0x542/0x18f0 fs/netfs/write_issue.c:421
netfs_writepages+0x2ba/0xb90 fs/netfs/write_issue.c:541
do_writepages+0x1a6/0x7f0 mm/page-writeback.c:2683
filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387
__filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430
v9fs_dir_release+0x429/0x590 fs/9p/vfs_dir.c:219
__fput+0x3f9/0xb60 fs/file_table.c:431
task_work_run+0x151/0x250 kernel/task_work.c:228
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xaa3/0x2bb0 kernel/exit.c:882
do_group_exit+0xd3/0x2a0 kernel/exit.c:1031
__do_sys_exit_group kernel/exit.c:1042 [inline]
__se_sys_exit_group kernel/exit.c:1040 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1040
x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232
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
Freed by task 11:
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:2250 [inline]
slab_free mm/slub.c:4474 [inline]
kfree+0x12a/0x3b0 mm/slub.c:4595
netfs_delete_buffer_head+0xa6/0x100 fs/netfs/misc.c:59
netfs_writeback_unlock_folios fs/netfs/write_collect.c:139 [inline]
netfs_collect_write_results fs/netfs/write_collect.c:493 [inline]
netfs_write_collection_worker+0x20f9/0x4f80 fs/netfs/write_collect.c:551
process_one_work+0x9c8/0x1b40 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3393
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
The buggy address belongs to the object at ffff88802c8aac00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 288 bytes inside of
freed 512-byte region [ffff88802c8aac00, ffff88802c8aae00)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2c8a8
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xfdffffff(slab)
raw: 00fff00000000040 ffff88801ac41c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000
head: 00fff00000000040 ffff88801ac41c80 dead000000000122 0000000000000000
head: 0000000000000000 0000000080100010 00000001fdffffff 0000000000000000
head: 00fff00000000002 ffffea0000b22a01 ffffffffffffffff 0000000000000000
head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5249, tgid 5249 (syz-executor341), ts 141121433556, free_ts 130792291213
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1500
prep_new_page mm/page_alloc.c:1508 [inline]
get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3446
__alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4702
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
alloc_slab_page+0x4e/0xf0 mm/slub.c:2319
allocate_slab mm/slub.c:2482 [inline]
new_slab+0x84/0x260 mm/slub.c:2535
___slab_alloc+0xdac/0x1870 mm/slub.c:3721
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3811
__slab_alloc_node mm/slub.c:3864 [inline]
slab_alloc_node mm/slub.c:4026 [inline]
__kmalloc_cache_noprof+0x2b4/0x300 mm/slub.c:4185
kmalloc_noprof include/linux/slab.h:690 [inline]
netfs_buffer_append_folio+0x181/0x750 fs/netfs/misc.c:25
netfs_write_folio+0x542/0x18f0 fs/netfs/write_issue.c:421
netfs_writepages+0x2ba/0xb90 fs/netfs/write_issue.c:541
do_writepages+0x1a6/0x7f0 mm/page-writeback.c:2683
filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
filemap_fdatawrite_wbc+0x148/0x1c0 mm/filemap.c:387
__filemap_fdatawrite_range+0xba/0x100 mm/filemap.c:430
v9fs_dir_release+0x429/0x590 fs/9p/vfs_dir.c:219
__fput+0x3f9/0xb60 fs/file_table.c:431
page last free pid 5243 tgid 5243 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1101 [inline]
free_unref_page+0x64a/0xe40 mm/page_alloc.c:2619
__put_partials+0x14c/0x170 mm/slub.c:3049
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:3989 [inline]
slab_alloc_node mm/slub.c:4038 [inline]
__kmalloc_cache_noprof+0x11e/0x300 mm/slub.c:4185
kmalloc_noprof include/linux/slab.h:690 [inline]
kzalloc_noprof include/linux/slab.h:816 [inline]
p9_fd_open net/9p/trans_fd.c:828 [inline]
p9_fd_create+0x164/0x490 net/9p/trans_fd.c:1102
p9_client_create+0x879/0x1210 net/9p/client.c:1015
v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc6/0xa50 fs/9p/vfs_super.c:122
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:3507 [inline]
path_mount+0x14e6/0x1f20 fs/namespace.c:3834
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4055 [inline]
__se_sys_mount fs/namespace.c:4032 [inline]
__x64_sys_mount+0x294/0x320 fs/namespace.c:4032
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:
ffff88802c8aac00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802c8aac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802c8aad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802c8aad80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802c8aae00: fc fc fc fc fc fc fc fc fc fc fc 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@...glegroups.com.
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
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