Re: [syzbot] KASAN: use-after-free Read in r871xu_dev_remove
From: syzbot
Date: Tue Jul 13 2021 - 07:18:27 EST
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-out-of-bounds Read in r871xu_dev_remove
==================================================================
BUG: KASAN: slab-out-of-bounds in debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
BUG: KASAN: slab-out-of-bounds in do_raw_spin_lock+0x262/0x2b0 kernel/locking/spinlock_debug.c:112
Read of size 4 at addr ffff88802f7ace14 by task kworker/0:0/5
CPU: 0 PID: 5 Comm: kworker/0:0 Tainted: G W 5.14.0-rc1-next-20210713-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233
__kasan_report mm/kasan/report.c:419 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:436
debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline]
do_raw_spin_lock+0x262/0x2b0 kernel/locking/spinlock_debug.c:112
do_wait_for_common kernel/sched/completion.c:86 [inline]
__wait_for_common kernel/sched/completion.c:106 [inline]
wait_for_common kernel/sched/completion.c:117 [inline]
wait_for_completion+0x181/0x280 kernel/sched/completion.c:138
r871xu_dev_remove+0x80/0x320 drivers/staging/rtl8712/usb_intf.c:599
usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458
__device_release_driver+0x3bd/0x6f0 drivers/base/dd.c:1201
device_release_driver_internal drivers/base/dd.c:1232 [inline]
device_release_driver+0x26/0x40 drivers/base/dd.c:1255
bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:529
device_del+0x502/0xd40 drivers/base/core.c:3544
usb_disable_device+0x35b/0x7b0 drivers/usb/core/message.c:1419
usb_disconnect.cold+0x27a/0x78e drivers/usb/core/hub.c:2221
hub_port_connect drivers/usb/core/hub.c:5151 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5440 [inline]
port_event drivers/usb/core/hub.c:5586 [inline]
hub_event+0x1c9c/0x4330 drivers/usb/core/hub.c:5668
process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Allocated by task 10657:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
____kasan_kmalloc mm/kasan/common.c:472 [inline]
__kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:596 [inline]
tomoyo_realpath_from_path+0xc3/0x620 security/tomoyo/realpath.c:254
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_number_perm+0x1d5/0x590 security/tomoyo/file.c:723
security_file_ioctl+0x50/0xb0 security/security.c:1539
__do_sys_ioctl fs/ioctl.c:1063 [inline]
__se_sys_ioctl fs/ioctl.c:1055 [inline]
__x64_sys_ioctl+0xb3/0x200 fs/ioctl.c:1055
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 10657:
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free mm/kasan/common.c:328 [inline]
__kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:229 [inline]
slab_free_hook mm/slub.c:1650 [inline]
slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1675
slab_free mm/slub.c:3235 [inline]
kfree+0xeb/0x650 mm/slub.c:4295
tomoyo_realpath_from_path+0x191/0x620 security/tomoyo/realpath.c:291
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_number_perm+0x1d5/0x590 security/tomoyo/file.c:723
security_file_ioctl+0x50/0xb0 security/security.c:1539
__do_sys_ioctl fs/ioctl.c:1063 [inline]
__se_sys_ioctl fs/ioctl.c:1055 [inline]
__x64_sys_ioctl+0xb3/0x200 fs/ioctl.c:1055
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
The buggy address belongs to the object at ffff88802f7ac000
which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 3604 bytes inside of
4096-byte region [ffff88802f7ac000, ffff88802f7ad000)
The buggy address belongs to the page:
page:ffffea0000bdea00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2f7a8
head:ffffea0000bdea00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888010842140
raw: 0000000000000000 0000000000040004 00000001ffffffff 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 59, ts 93061328154, free_ts 93052725619
prep_new_page mm/page_alloc.c:2433 [inline]
get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4166
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5374
alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244
alloc_slab_page mm/slub.c:1713 [inline]
allocate_slab+0x32b/0x4c0 mm/slub.c:1853
new_slab mm/slub.c:1916 [inline]
new_slab_objects mm/slub.c:2662 [inline]
___slab_alloc+0x4ba/0x820 mm/slub.c:2825
__slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2865
slab_alloc_node mm/slub.c:2947 [inline]
slab_alloc mm/slub.c:2989 [inline]
kmem_cache_alloc_trace+0x30f/0x3c0 mm/slub.c:3006
kmalloc include/linux/slab.h:591 [inline]
kzalloc include/linux/slab.h:721 [inline]
kobject_uevent_env+0x240/0x1650 lib/kobject_uevent.c:524
driver_bound+0x1a8/0x300 drivers/base/dd.c:401
really_probe+0x3d8/0xcd0 drivers/base/dd.c:643
__driver_probe_device+0x338/0x4d0 drivers/base/dd.c:747
driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:777
__device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:894
bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427
__device_attach+0x228/0x4a0 drivers/base/dd.c:965
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1343 [inline]
free_pcp_prepare+0x312/0x7d0 mm/page_alloc.c:1394
free_unref_page_prepare mm/page_alloc.c:3329 [inline]
free_unref_page+0x19/0x690 mm/page_alloc.c:3408
kvfree+0x42/0x50 mm/util.c:616
netdev_freemem net/core/dev.c:10780 [inline]
free_netdev+0x495/0x5b0 net/core/dev.c:10958
rtl871x_load_fw_cb drivers/staging/rtl8712/hal_init.c:47 [inline]
rtl871x_load_fw_cb.cold+0x100/0x120 drivers/staging/rtl8712/hal_init.c:32
request_firmware_work_func+0x12c/0x230 drivers/base/firmware_loader/main.c:1081
process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Memory state around the buggy address:
ffff88802f7acd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802f7acd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802f7ace00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802f7ace80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802f7acf00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Tested on:
commit: 8f0df15b Add linux-next specific files for 20210713
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12ef886c300000
kernel config: https://syzkaller.appspot.com/x/.config?x=5ef73f190e4b0b9a
dashboard link: https://syzkaller.appspot.com/bug?extid=5872a520e0ce0a7c7230
compiler:
patch: https://syzkaller.appspot.com/x/patch.diff?x=164561d2300000