Re: [syzbot] [net?] KASAN: slab-use-after-free Read in handle_tx (2)

syzbot
2025-01-17T17:11:26Z

syzbot has found a reproducer for the following issue on:

HEAD commit: 9bffa1ad25b8 Merge tag 'drm-fixes-2025-01-17' of https://g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=107a69df980000
kernel config: https://syzkaller.appspot.com/x/.config?x=d1cb4a1f148c0861
dashboard link: https://syzkaller.appspot.com/bug?extid=827272712bd6d12c79a4
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=15783a18580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17d6c2b0580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-9bffa1ad.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0c65d8091a25/vmlinux-9bffa1ad.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1d98f79a18b7/bzImage-9bffa1ad.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+827272712bd6d12c79a4@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-use-after-free in handle_tx+0x5a5/0x630 drivers/net/caif/caif_serial.c:236
Read of size 8 at addr ffff888027ef3020 by task aoe_tx0/1417

CPU: 3 UID: 0 PID: 1417 Comm: aoe_tx0 Not tainted 6.13.0-rc7-syzkaller-00149-g9bffa1ad25b8 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xc3/0x620 mm/kasan/report.c:489
kasan_report+0xd9/0x110 mm/kasan/report.c:602
handle_tx+0x5a5/0x630 drivers/net/caif/caif_serial.c:236
__netdev_start_xmit include/linux/netdevice.h:5002 [inline]
netdev_start_xmit include/linux/netdevice.h:5011 [inline]
xmit_one net/core/dev.c:3620 [inline]
dev_hard_start_xmit+0x9a/0x7b0 net/core/dev.c:3636
__dev_queue_xmit+0x7f0/0x43e0 net/core/dev.c:4466
dev_queue_xmit include/linux/netdevice.h:3168 [inline]
tx+0xcc/0x190 drivers/block/aoe/aoenet.c:62
kthread+0x1e7/0x3c0 drivers/block/aoe/aoecmd.c:1237
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 9336:
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:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:901 [inline]
kzalloc_noprof include/linux/slab.h:1037 [inline]
alloc_tty_struct+0x98/0x8d0 drivers/tty/tty_io.c:3116
tty_init_dev.part.0+0x1e/0x660 drivers/tty/tty_io.c:1409
tty_init_dev include/linux/err.h:67 [inline]
tty_open_by_driver drivers/tty/tty_io.c:2082 [inline]
tty_open+0xac1/0xf80 drivers/tty/tty_io.c:2129
chrdev_open+0x237/0x6a0 fs/char_dev.c:414
do_dentry_open+0xf59/0x1ea0 fs/open.c:945
vfs_open+0x82/0x3f0 fs/open.c:1075
do_open fs/namei.c:3828 [inline]
path_openat+0x1e6a/0x2d60 fs/namei.c:3987
do_filp_open+0x20c/0x470 fs/namei.c:4014
do_sys_openat2+0x17a/0x1e0 fs/open.c:1402
do_sys_open fs/open.c:1417 [inline]
__do_sys_openat fs/open.c:1433 [inline]
__se_sys_openat fs/open.c:1428 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1428
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 3233:
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:582
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2353 [inline]
slab_free mm/slub.c:4613 [inline]
kfree+0x14f/0x4b0 mm/slub.c:4761
process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3236
process_scheduled_works kernel/workqueue.c:3317 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3398
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

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:544
insert_work+0x36/0x230 kernel/workqueue.c:2183
__queue_work+0x97e/0x1080 kernel/workqueue.c:2339
queue_work_on+0x11a/0x140 kernel/workqueue.c:2390
kref_put include/linux/kref.h:65 [inline]
tty_kref_put drivers/tty/tty_io.c:1566 [inline]
tty_kref_put drivers/tty/tty_io.c:1563 [inline]
release_tty+0x4de/0x5d0 drivers/tty/tty_io.c:1602
tty_release_struct+0xb7/0xe0 drivers/tty/tty_io.c:1701
tty_release+0xe25/0x1410 drivers/tty/tty_io.c:1861
__fput+0x3f8/0xb60 fs/file_table.c:450
__fput_sync+0xa1/0xc0 fs/file_table.c:535
__do_sys_close fs/open.c:1554 [inline]
__se_sys_close fs/open.c:1539 [inline]
__x64_sys_close+0x86/0x100 fs/open.c:1539
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

The buggy address belongs to the object at ffff888027ef3000
which belongs to the cache kmalloc-cg-2k of size 2048
The buggy address is located 32 bytes inside of
freed 2048-byte region [ffff888027ef3000, ffff888027ef3800)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27ef0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88802da23f81
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b050140 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000080008 00000001f5000000 ffff88802da23f81
head: 00fff00000000040 ffff88801b050140 dead000000000100 dead000000000122
head: 0000000000000000 0000000000080008 00000001f5000000 ffff88802da23f81
head: 00fff00000000003 ffffea00009fbc01 ffffffffffffffff 0000000000000000
head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5950, tgid 5950 (syz-executor374), ts 92233424258, free_ts 92129665975
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1558
prep_new_page mm/page_alloc.c:1566 [inline]
get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3476
__alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4753
alloc_pages_mpol_noprof+0x2c8/0x620 mm/mempolicy.c:2269
alloc_slab_page mm/slub.c:2423 [inline]
allocate_slab mm/slub.c:2589 [inline]
new_slab+0x2c9/0x410 mm/slub.c:2642
___slab_alloc+0xd7d/0x17a0 mm/slub.c:3830
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920
__slab_alloc_node mm/slub.c:3995 [inline]
slab_alloc_node mm/slub.c:4156 [inline]
__do_kmalloc_node mm/slub.c:4297 [inline]
__kmalloc_node_noprof+0x2f0/0x510 mm/slub.c:4304
__kvmalloc_node_noprof+0xad/0x1a0 mm/util.c:645
kvmalloc_array_node_noprof include/linux/slab.h:1063 [inline]
alloc_fdtable+0xee/0x2b0 fs/file.c:199
dup_fd+0x83b/0xb90 fs/file.c:400
copy_files kernel/fork.c:1797 [inline]
copy_process+0x25d2/0x8e50 kernel/fork.c:2382
kernel_clone+0xfd/0x960 kernel/fork.c:2806
__do_sys_clone+0xba/0x100 kernel/fork.c:2949
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 6083 tgid 6083 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1127 [inline]
free_unref_page+0x661/0x1080 mm/page_alloc.c:2659
__put_partials+0x14c/0x170 mm/slub.c:3157
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4119 [inline]
slab_alloc_node mm/slub.c:4168 [inline]
kmem_cache_alloc_noprof+0x226/0x3d0 mm/slub.c:4175
getname_flags.part.0+0x4c/0x550 fs/namei.c:139
getname_flags include/linux/audit.h:322 [inline]
getname+0x8d/0xe0 fs/namei.c:223
getname_maybe_null include/linux/fs.h:2796 [inline]
vfs_fstatat+0xdf/0xf0 fs/stat.c:361
__do_sys_newfstatat+0xa2/0x130 fs/stat.c:530
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:
ffff888027ef2f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888027ef2f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888027ef3000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888027ef3080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888027ef3100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

---
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