Re: [syzbot] [f2fs?] KASAN: null-ptr-deref Write in f2fs_stop_gc_thread

From: syzbot
Date: Thu Jul 25 2024 - 04:04:18 EST

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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 f2fs_stop_gc_thread

F2FS-fs (loop3): Stopped filesystem due to reason: 0
==================================================================
BUG: KASAN: slab-use-after-free in f2fs_stop_gc_thread+0x6b/0xd0 fs/f2fs/gc.c:212
Read of size 8 at addr ffff888078ea1d00 by task syz.3.57/6875

CPU: 0 PID: 6875 Comm: syz.3.57 Not tainted 6.10.0-syzkaller-11185-g2c9b3512402e-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
f2fs_stop_gc_thread+0x6b/0xd0 fs/f2fs/gc.c:212
f2fs_do_shutdown+0x192/0x540 fs/f2fs/file.c:2283
f2fs_ioc_shutdown fs/f2fs/file.c:2325 [inline]
__f2fs_ioctl+0x443a/0xbe60 fs/f2fs/file.c:4325
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9e51975b59
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9e5270f048 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9e51b05f60 RCX: 00007f9e51975b59
RDX: 0000000020000140 RSI: 000000008004587d RDI: 0000000000000005
RBP: 00007f9e519e4e5d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9e51b05f60 R15: 00007ffdd9ccdb78
</TASK>

Allocated by task 6875:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:211 [inline]
__kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4180
kmalloc_noprof include/linux/slab.h:681 [inline]
f2fs_kmalloc fs/f2fs/f2fs.h:3389 [inline]
f2fs_start_gc_thread+0x1ab/0x570 fs/f2fs/gc.c:177
f2fs_fill_super+0x7326/0x7be0 fs/f2fs/super.c:4756
mount_bdev+0x20a/0x2d0 fs/super.c:1668
legacy_get_tree+0xee/0x190 fs/fs_context.c:662
vfs_get_tree+0x90/0x2a0 fs/super.c:1789
do_new_mount+0x2be/0xb40 fs/namespace.c:3472
do_mount fs/namespace.c:3812 [inline]
__do_sys_mount fs/namespace.c:4020 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 6918:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
__kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2235 [inline]
slab_free mm/slub.c:4464 [inline]
kfree+0x149/0x360 mm/slub.c:4585
f2fs_stop_gc_thread+0xa3/0xd0 fs/f2fs/gc.c:215
f2fs_do_shutdown+0x192/0x540 fs/f2fs/file.c:2283
f2fs_ioc_shutdown fs/f2fs/file.c:2325 [inline]
__f2fs_ioctl+0x443a/0xbe60 fs/f2fs/file.c:4325
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888078ea1d00
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 0 bytes inside of
freed 192-byte region [ffff888078ea1d00, ffff888078ea1dc0)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78ea1
anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffefff(slab)
raw: 00fff00000000000 ffff8880150413c0 ffffea00007ed440 dead000000000005
raw: 0000000000000000 0000000000100010 00000001ffffefff 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 0x152cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5198, tgid 5198 (syz-executor), ts 77801127248, free_ts 77710043750
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1473
prep_new_page mm/page_alloc.c:1481 [inline]
get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3425
__alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4683
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
alloc_slab_page+0x5f/0x120 mm/slub.c:2304
allocate_slab+0x5a/0x2f0 mm/slub.c:2467
new_slab mm/slub.c:2520 [inline]
___slab_alloc+0xcd1/0x14b0 mm/slub.c:3706
__slab_alloc+0x58/0xa0 mm/slub.c:3796
__slab_alloc_node mm/slub.c:3849 [inline]
slab_alloc_node mm/slub.c:4016 [inline]
__do_kmalloc_node mm/slub.c:4148 [inline]
__kmalloc_noprof+0x25a/0x400 mm/slub.c:4161
kmalloc_noprof include/linux/slab.h:685 [inline]
kzalloc_noprof include/linux/slab.h:807 [inline]
new_dir fs/proc/proc_sysctl.c:951 [inline]
get_subdir fs/proc/proc_sysctl.c:995 [inline]
sysctl_mkdir_p fs/proc/proc_sysctl.c:1304 [inline]
__register_sysctl_table+0xca1/0x1550 fs/proc/proc_sysctl.c:1379
__addrconf_sysctl_register+0x234/0x3a0 net/ipv6/addrconf.c:7216
addrconf_sysctl_register+0x167/0x1c0 net/ipv6/addrconf.c:7264
ipv6_add_dev+0xcf6/0x1220 net/ipv6/addrconf.c:456
addrconf_notify+0x6a7/0x1020 net/ipv6/addrconf.c:3653
notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2032 [inline]
call_netdevice_notifiers net/core/dev.c:2046 [inline]
register_netdevice+0x167f/0x1b00 net/core/dev.c:10468
cfg80211_register_netdevice+0x149/0x2f0 net/wireless/core.c:1442
page last free pid 5198 tgid 5198 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1093 [inline]
free_unref_page+0xd19/0xea0 mm/page_alloc.c:2588
discard_slab mm/slub.c:2566 [inline]
__put_partials+0xeb/0x130 mm/slub.c:3034
put_cpu_partial+0x17c/0x250 mm/slub.c:3109
__slab_free+0x2ea/0x3d0 mm/slub.c:4334
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3979 [inline]
slab_alloc_node mm/slub.c:4028 [inline]
kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4071
__alloc_skb+0x1c3/0x440 net/core/skbuff.c:664
netlink_sendmsg+0x638/0xcb0 net/netlink/af_netlink.c:1876
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0x221/0x270 net/socket.c:745
__sys_sendto+0x3a4/0x4f0 net/socket.c:2204
__do_sys_sendto net/socket.c:2216 [inline]
__se_sys_sendto net/socket.c:2212 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2212
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
ffff888078ea1c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888078ea1c80: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888078ea1d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888078ea1d80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
ffff888078ea1e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================

Tested on:

commit: 2c9b3512 Merge tag 'for-linus' of git://git.kernel.org..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=16c7609d980000
kernel config: https://syzkaller.appspot.com/x/.config?x=f4925140c45a2a50
dashboard link: https://syzkaller.appspot.com/bug?extid=1a8e2b31f2ac9bd3d148
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=1545b33d980000

Next message: Manivannan Sadhasivam: "Re: [PATCH v2 2/2] dmaengine: dw-edma: Do not enable watermark interrupts for HDMA"
Previous message: claudiu beznea: "Re: [PATCH v2 02/11] mfd: renesas-vbattb: Add a MFD driver for the Renesas VBATTB IP"
In reply to: syzbot: "Re: [syzbot] [f2fs?] KASAN: null-ptr-deref Write in f2fs_stop_gc_thread"
Next in thread: syzbot: "Re: [syzbot] [f2fs?] KASAN: null-ptr-deref Write in f2fs_stop_gc_thread"
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