[syzbot] [pvrusb2?] [usb?] KASAN: slab-use-after-free Read in pvr2_context_set_notify

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syzbot

unread,
Jul 8, 2023, 8:30:55 AM7/8/23
to is...@pobox.com, linux-...@vger.kernel.org, linux...@vger.kernel.org, linu...@vger.kernel.org, mch...@kernel.org, pvr...@isely.net, syzkall...@googlegroups.com
Hello,

syzbot found the following issue on:

HEAD commit: 24be4d0b46bb arch/arm64/mm/fault: Fix undeclared variable ..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
console output: https://syzkaller.appspot.com/x/log.txt?x=11383b04a80000
kernel config: https://syzkaller.appspot.com/x/.config?x=f9122dc1c4589f4c
dashboard link: https://syzkaller.appspot.com/bug?extid=621409285c4156a009b3
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14e2e43ca80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=109a3a90a80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/b64cbb1118f1/disk-24be4d0b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/568048c1dd0d/vmlinux-24be4d0b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/84ac264152e7/bzImage-24be4d0b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+621409...@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-use-after-free in pvr2_context_set_notify+0x2c4/0x310 drivers/media/usb/pvrusb2/pvrusb2-context.c:35
Read of size 4 at addr ffff88810eb986d8 by task kworker/0:0/7

CPU: 0 PID: 7 Comm: kworker/0:0 Not tainted 6.4.0-syzkaller-11311-g24be4d0b46bb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Workqueue: usb_hub_wq hub_event

Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:364
print_report mm/kasan/report.c:475 [inline]
kasan_report+0x11d/0x130 mm/kasan/report.c:588
pvr2_context_set_notify+0x2c4/0x310 drivers/media/usb/pvrusb2/pvrusb2-context.c:35
pvr_disconnect+0x80/0xf0 drivers/media/usb/pvrusb2/pvrusb2-main.c:79
usb_unbind_interface+0x1dc/0x8e0 drivers/usb/core/driver.c:458
device_remove drivers/base/dd.c:569 [inline]
device_remove+0x11f/0x170 drivers/base/dd.c:561
__device_release_driver drivers/base/dd.c:1270 [inline]
device_release_driver_internal+0x443/0x610 drivers/base/dd.c:1293
bus_remove_device+0x22c/0x420 drivers/base/bus.c:574
device_del+0x399/0xa30 drivers/base/core.c:3814
usb_disable_device+0x360/0x7b0 drivers/usb/core/message.c:1420
usb_disconnect+0x2db/0x8a0 drivers/usb/core/hub.c:2253
hub_port_connect drivers/usb/core/hub.c:5261 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5566 [inline]
port_event drivers/usb/core/hub.c:5726 [inline]
hub_event+0x2073/0x4ed0 drivers/usb/core/hub.c:5808
process_one_work+0xa34/0x16f0 kernel/workqueue.c:2597
process_scheduled_works kernel/workqueue.c:2664 [inline]
worker_thread+0x881/0x10c0 kernel/workqueue.c:2750
kthread+0x344/0x440 kernel/kthread.c:389
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>

Allocated by task 7:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x7b/0x90 mm/kasan/common.c:383
kmalloc include/linux/slab.h:579 [inline]
kzalloc include/linux/slab.h:700 [inline]
pvr2_context_create+0x53/0x2a0 drivers/media/usb/pvrusb2/pvrusb2-context.c:207
pvr_probe+0x25/0xe0 drivers/media/usb/pvrusb2/pvrusb2-main.c:54
usb_probe_interface+0x30f/0x960 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x240/0xca0 drivers/base/dd.c:658
__driver_probe_device+0x1df/0x4b0 drivers/base/dd.c:798
driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:828
__device_attach_driver+0x1d4/0x2e0 drivers/base/dd.c:956
bus_for_each_drv+0x149/0x1d0 drivers/base/bus.c:457
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1028
bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532
device_add+0x112d/0x1a40 drivers/base/core.c:3625
usb_set_configuration+0x1196/0x1bc0 drivers/usb/core/message.c:2211
usb_generic_driver_probe+0xcf/0x130 drivers/usb/core/generic.c:238
usb_probe_device+0xd8/0x2c0 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x240/0xca0 drivers/base/dd.c:658
__driver_probe_device+0x1df/0x4b0 drivers/base/dd.c:798
driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:828
__device_attach_driver+0x1d4/0x2e0 drivers/base/dd.c:956
bus_for_each_drv+0x149/0x1d0 drivers/base/bus.c:457
__device_attach+0x1e4/0x4b0 drivers/base/dd.c:1028
bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532
device_add+0x112d/0x1a40 drivers/base/core.c:3625
usb_new_device+0xcb2/0x19d0 drivers/usb/core/hub.c:2590
hub_port_connect drivers/usb/core/hub.c:5422 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5566 [inline]
port_event drivers/usb/core/hub.c:5726 [inline]
hub_event+0x2e3d/0x4ed0 drivers/usb/core/hub.c:5808
process_one_work+0xa34/0x16f0 kernel/workqueue.c:2597
process_scheduled_works kernel/workqueue.c:2664 [inline]
worker_thread+0x881/0x10c0 kernel/workqueue.c:2750
kthread+0x344/0x440 kernel/kthread.c:389
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Freed by task 892:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:521
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x144/0x1b0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:162 [inline]
slab_free_hook mm/slub.c:1792 [inline]
slab_free_freelist_hook mm/slub.c:1818 [inline]
slab_free mm/slub.c:3801 [inline]
__kmem_cache_free+0xa1/0x350 mm/slub.c:3814
pvr2_context_check drivers/media/usb/pvrusb2/pvrusb2-context.c:137 [inline]
pvr2_context_thread_func+0x664/0x8e0 drivers/media/usb/pvrusb2/pvrusb2-context.c:158
kthread+0x344/0x440 kernel/kthread.c:389
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff88810eb98600
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 216 bytes inside of
freed 256-byte region [ffff88810eb98600, ffff88810eb98700)

The buggy address belongs to the physical page:
page:ffffea00043ae600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10eb98
head:ffffea00043ae600 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x200000000010200(slab|head|node=0|zone=2)
page_type: 0xffffffff()
raw: 0200000000010200 ffff888100041b40 ffffea00043ae300 0000000000000003
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 7338785555, free_ts 0
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1570
prep_new_page mm/page_alloc.c:1577 [inline]
get_page_from_freelist+0x13d5/0x2cb0 mm/page_alloc.c:3221
__alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4477
alloc_page_interleave+0x1e/0x1e0 mm/mempolicy.c:2112
alloc_pages+0x233/0x270 mm/mempolicy.c:2274
alloc_slab_page mm/slub.c:1862 [inline]
allocate_slab+0x25f/0x390 mm/slub.c:2009
new_slab mm/slub.c:2062 [inline]
___slab_alloc+0xbc3/0x15d0 mm/slub.c:3215
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314
__slab_alloc_node mm/slub.c:3367 [inline]
slab_alloc_node mm/slub.c:3460 [inline]
__kmem_cache_alloc_node+0x2c3/0x300 mm/slub.c:3509
__do_kmalloc_node mm/slab_common.c:984 [inline]
__kmalloc_node_track_caller+0x4f/0x1a0 mm/slab_common.c:1005
__do_krealloc mm/slab_common.c:1373 [inline]
krealloc+0x5e/0xf0 mm/slab_common.c:1406
add_sysfs_param+0xca/0x960 kernel/params.c:652
kernel_add_sysfs_param kernel/params.c:813 [inline]
param_sysfs_builtin kernel/params.c:852 [inline]
param_sysfs_builtin_init+0x241/0x440 kernel/params.c:986
do_one_initcall+0x105/0x630 init/main.c:1232
do_initcall_level init/main.c:1294 [inline]
do_initcalls init/main.c:1310 [inline]
do_basic_setup init/main.c:1329 [inline]
kernel_init_freeable+0x649/0xb90 init/main.c:1546
kernel_init+0x1e/0x2c0 init/main.c:1437
page_owner free stack trace missing

Memory state around the buggy address:
ffff88810eb98580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88810eb98600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88810eb98680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88810eb98700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88810eb98780: 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 syzk...@googlegroups.com.

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If the bug is already fixed, let syzbot know by replying with:
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If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to change bug's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)

If the bug is a duplicate of another bug, reply with:
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If you want to undo deduplication, reply with:
#syz undup

syzbot

unread,
Jul 9, 2023, 2:02:28 AM7/9/23
to syzkall...@googlegroups.com, yogi....@gmail.com
Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Read in pvr2_context_set_notify

==================================================================
BUG: KASAN: slab-use-after-free in pvr2_context_set_notify+0x2c4/0x310 drivers/media/usb/pvrusb2/pvrusb2-context.c:35
Read of size 4 at addr ffff888113dc6cd8 by task kworker/0:3/5792

CPU: 0 PID: 5792 Comm: kworker/0:3 Not tainted 6.4.0-syzkaller-12454-g1c7873e33645 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Allocated by task 5792:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x7b/0x90 mm/kasan/common.c:383
kmalloc include/linux/slab.h:582 [inline]
kzalloc include/linux/slab.h:703 [inline]
worker_thread+0x67d/0x10c0 kernel/workqueue.c:2748
kthread+0x344/0x440 kernel/kthread.c:389
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Freed by task 892:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x144/0x1b0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:162 [inline]
slab_free_hook mm/slub.c:1792 [inline]
slab_free_freelist_hook mm/slub.c:1818 [inline]
slab_free mm/slub.c:3801 [inline]
__kmem_cache_free+0xa1/0x350 mm/slub.c:3814
pvr2_context_check drivers/media/usb/pvrusb2/pvrusb2-context.c:137 [inline]
pvr2_context_thread_func+0x664/0x8e0 drivers/media/usb/pvrusb2/pvrusb2-context.c:158
kthread+0x344/0x440 kernel/kthread.c:389
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Last potentially related work creation:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
__kasan_record_aux_stack+0x99/0xb0 mm/kasan/generic.c:492
kvfree_call_rcu+0x70/0xbc0 kernel/rcu/tree.c:3368
drop_sysctl_table+0x3c2/0x4e0 fs/proc/proc_sysctl.c:1506
unregister_sysctl_table fs/proc/proc_sysctl.c:1527 [inline]
unregister_sysctl_table+0x41/0x60 fs/proc/proc_sysctl.c:1519
sysctl_route_net_exit+0x5c/0x90 net/ipv4/route.c:3635
ops_exit_list+0xb0/0x170 net/core/net_namespace.c:170
cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:614
process_one_work+0xa34/0x16f0 kernel/workqueue.c:2597
worker_thread+0x67d/0x10c0 kernel/workqueue.c:2748
kthread+0x344/0x440 kernel/kthread.c:389
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

The buggy address belongs to the object at ffff888113dc6c00
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 216 bytes inside of
freed 256-byte region [ffff888113dc6c00, ffff888113dc6d00)

The buggy address belongs to the physical page:
page:ffffea00044f7180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113dc6
head:ffffea00044f7180 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x200000000010200(slab|head|node=0|zone=2)
page_type: 0xffffffff()
raw: 0200000000010200 ffff888100041b40 ffffea00043ede80 dead000000000002
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 8012323672, free_ts 0
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1570
prep_new_page mm/page_alloc.c:1577 [inline]
get_page_from_freelist+0x13d5/0x2cb0 mm/page_alloc.c:3221
__alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4477
alloc_page_interleave+0x1e/0x1e0 mm/mempolicy.c:2112
alloc_pages+0x233/0x270 mm/mempolicy.c:2274
alloc_slab_page mm/slub.c:1862 [inline]
allocate_slab+0x25f/0x390 mm/slub.c:2009
new_slab mm/slub.c:2062 [inline]
___slab_alloc+0xbc3/0x15d0 mm/slub.c:3215
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314
__slab_alloc_node mm/slub.c:3367 [inline]
slab_alloc_node mm/slub.c:3460 [inline]
__kmem_cache_alloc_node+0x2de/0x310 mm/slub.c:3509
__do_kmalloc_node mm/slab_common.c:984 [inline]
__kmalloc_node_track_caller+0x4f/0x1a0 mm/slab_common.c:1005
__do_krealloc mm/slab_common.c:1373 [inline]
krealloc+0x5e/0xf0 mm/slab_common.c:1406
add_sysfs_param+0xca/0x960 kernel/params.c:652
kernel_add_sysfs_param kernel/params.c:813 [inline]
param_sysfs_builtin kernel/params.c:852 [inline]
param_sysfs_builtin_init+0x241/0x440 kernel/params.c:986
do_one_initcall+0x105/0x630 init/main.c:1232
do_initcall_level init/main.c:1294 [inline]
do_initcalls init/main.c:1310 [inline]
do_basic_setup init/main.c:1329 [inline]
kernel_init_freeable+0x649/0xb90 init/main.c:1546
kernel_init+0x1e/0x2c0 init/main.c:1437
page_owner free stack trace missing

Memory state around the buggy address:
ffff888113dc6b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888113dc6c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888113dc6c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888113dc6d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888113dc6d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


Tested on:

commit: 1c7873e3 mm: lock newly mapped VMA with corrected orde..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17e8deb0a80000
kernel config: https://syzkaller.appspot.com/x/.config?x=cea49cd47e86ce3e
dashboard link: https://syzkaller.appspot.com/bug?extid=621409285c4156a009b3
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Note: no patches were applied.

Yogesh Hegde

unread,
Jul 10, 2023, 5:21:15 AM7/10/23
to syzbot+621409...@syzkaller.appspotmail.com, syzkall...@googlegroups.com
Test reproducer on latest mainline kernel.

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

Ricardo B. Marliere

unread,
Sep 27, 2023, 10:37:44 AM9/27/23
to syzbot, is...@pobox.com, linux-...@vger.kernel.org, linux...@vger.kernel.org, linu...@vger.kernel.org, mch...@kernel.org, pvr...@isely.net, syzkall...@googlegroups.com
#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git ce9ecca0238b140b88f43859b211c9fdfd8e5b70
patch

syzbot

unread,
Sep 27, 2023, 10:55:27 AM9/27/23
to is...@pobox.com, linux-...@vger.kernel.org, linux...@vger.kernel.org, linu...@vger.kernel.org, mch...@kernel.org, pvr...@isely.net, ric...@marliere.net, syzkall...@googlegroups.com
Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Read in pvr2_context_set_notify

pvrusb2: Important functionality might not be entirely working.
pvrusb2: Please consider contacting the driver author to help with further stabilization of the driver.
pvrusb2: **********
usb 1-1: USB disconnect, device number 102
pvrusb2: Device being rendered inoperable
==================================================================
BUG: KASAN: slab-use-after-free in pvr2_context_set_notify+0x2fa/0x350 drivers/media/usb/pvrusb2/pvrusb2-context.c:42
Read of size 4 at addr ffff8881093becd8 by task kworker/0:0/8

CPU: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.6.0-rc2-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xc4/0x620 mm/kasan/report.c:475
kasan_report+0xda/0x110 mm/kasan/report.c:588
pvr2_context_set_notify+0x2fa/0x350 drivers/media/usb/pvrusb2/pvrusb2-context.c:42
pvr_disconnect+0x80/0xf0 drivers/media/usb/pvrusb2/pvrusb2-main.c:79
usb_unbind_interface+0x1dd/0x8d0 drivers/usb/core/driver.c:458
device_remove drivers/base/dd.c:569 [inline]
device_remove+0x11f/0x170 drivers/base/dd.c:561
__device_release_driver drivers/base/dd.c:1272 [inline]
device_release_driver_internal+0x44a/0x610 drivers/base/dd.c:1295
bus_remove_device+0x22c/0x420 drivers/base/bus.c:574
device_del+0x39a/0xa50 drivers/base/core.c:3813
usb_disable_device+0x36c/0x7f0 drivers/usb/core/message.c:1416
usb_disconnect+0x2e1/0x890 drivers/usb/core/hub.c:2252
hub_port_connect drivers/usb/core/hub.c:5280 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5580 [inline]
port_event drivers/usb/core/hub.c:5740 [inline]
hub_event+0x1be0/0x4f30 drivers/usb/core/hub.c:5822
process_one_work+0x884/0x15c0 kernel/workqueue.c:2630
process_scheduled_works kernel/workqueue.c:2703 [inline]
worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
kthread+0x33c/0x440 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
</TASK>

Allocated by task 8:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x87/0x90 mm/kasan/common.c:383
kmalloc include/linux/slab.h:599 [inline]
kzalloc include/linux/slab.h:720 [inline]
pvr2_context_create+0x53/0x2a0 drivers/media/usb/pvrusb2/pvrusb2-context.c:208
pvr_probe+0x25/0xe0 drivers/media/usb/pvrusb2/pvrusb2-main.c:54
usb_probe_interface+0x307/0x930 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x234/0xc90 drivers/base/dd.c:658
__driver_probe_device+0x1de/0x4b0 drivers/base/dd.c:800
driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:830
__device_attach_driver+0x1d4/0x300 drivers/base/dd.c:958
bus_for_each_drv+0x157/0x1d0 drivers/base/bus.c:457
__device_attach+0x1e8/0x4b0 drivers/base/dd.c:1030
bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532
device_add+0x117e/0x1aa0 drivers/base/core.c:3624
usb_set_configuration+0x10cb/0x1c40 drivers/usb/core/message.c:2207
usb_generic_driver_probe+0xca/0x130 drivers/usb/core/generic.c:238
usb_probe_device+0xda/0x2c0 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x234/0xc90 drivers/base/dd.c:658
__driver_probe_device+0x1de/0x4b0 drivers/base/dd.c:800
driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:830
__device_attach_driver+0x1d4/0x300 drivers/base/dd.c:958
bus_for_each_drv+0x157/0x1d0 drivers/base/bus.c:457
__device_attach+0x1e8/0x4b0 drivers/base/dd.c:1030
bus_probe_device+0x17c/0x1c0 drivers/base/bus.c:532
device_add+0x117e/0x1aa0 drivers/base/core.c:3624
usb_new_device+0xd80/0x1960 drivers/usb/core/hub.c:2589
hub_port_connect drivers/usb/core/hub.c:5440 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5580 [inline]
port_event drivers/usb/core/hub.c:5740 [inline]
hub_event+0x2e62/0x4f30 drivers/usb/core/hub.c:5822
process_one_work+0x884/0x15c0 kernel/workqueue.c:2630
process_scheduled_works kernel/workqueue.c:2703 [inline]
worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
kthread+0x33c/0x440 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

Freed by task 901:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x13c/0x190 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1800 [inline]
slab_free_freelist_hook mm/slub.c:1826 [inline]
slab_free mm/slub.c:3809 [inline]
__kmem_cache_free+0xff/0x330 mm/slub.c:3822
pvr2_context_check drivers/media/usb/pvrusb2/pvrusb2-context.c:144 [inline]
pvr2_context_thread_func+0x69d/0x960 drivers/media/usb/pvrusb2/pvrusb2-context.c:159
kthread+0x33c/0x440 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

The buggy address belongs to the object at ffff8881093bec00
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 216 bytes inside of
freed 256-byte region [ffff8881093bec00, ffff8881093bed00)

The buggy address belongs to the physical page:
page:ffffea000424ef80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1093be
head:ffffea000424ef80 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x200000000000840(slab|head|node=0|zone=2)
page_type: 0xffffffff()
raw: 0200000000000840 ffff888100041b40 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 8817323426, free_ts 0
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1536
prep_new_page mm/page_alloc.c:1543 [inline]
get_page_from_freelist+0x10e1/0x2fd0 mm/page_alloc.c:3170
__alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4426
alloc_page_interleave+0x1e/0x230 mm/mempolicy.c:2131
alloc_pages+0x22a/0x270 mm/mempolicy.c:2293
alloc_slab_page mm/slub.c:1870 [inline]
allocate_slab+0x251/0x380 mm/slub.c:2017
new_slab mm/slub.c:2070 [inline]
___slab_alloc+0x8c7/0x1580 mm/slub.c:3223
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322
__slab_alloc_node mm/slub.c:3375 [inline]
slab_alloc_node mm/slub.c:3468 [inline]
__kmem_cache_alloc_node+0x12c/0x310 mm/slub.c:3517
kmalloc_trace+0x25/0xe0 mm/slab_common.c:1114
kmalloc include/linux/slab.h:599 [inline]
kzalloc include/linux/slab.h:720 [inline]
bus_add_driver+0x92/0x630 drivers/base/bus.c:657
driver_register+0x15c/0x4a0 drivers/base/driver.c:246
usb_register_driver+0x24f/0x500 drivers/usb/core/driver.c:1062
do_one_initcall+0x117/0x630 init/main.c:1232
do_initcall_level init/main.c:1294 [inline]
do_initcalls init/main.c:1310 [inline]
do_basic_setup init/main.c:1329 [inline]
kernel_init_freeable+0x5bd/0x8f0 init/main.c:1547
kernel_init+0x1c/0x2a0 init/main.c:1437
page_owner free stack trace missing

Memory state around the buggy address:
ffff8881093beb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881093bec00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881093bec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8881093bed00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8881093bed80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


Tested on:

commit: ce9ecca0 Linux 6.6-rc2
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
console output: https://syzkaller.appspot.com/x/log.txt?x=13f01d0a680000
kernel config: https://syzkaller.appspot.com/x/.config?x=59eae8406319284a
dashboard link: https://syzkaller.appspot.com/bug?extid=621409285c4156a009b3
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=12ca2656680000

Hillf Danton

unread,
Sep 28, 2023, 7:20:42 AM9/28/23
to syzbot, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Serialize pvr2_context_thread_func() and pvr2_context_disconnect() with mutex.

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

--- x/drivers/media/usb/pvrusb2/pvrusb2-context.c
+++ y/drivers/media/usb/pvrusb2/pvrusb2-context.c
@@ -26,6 +26,8 @@ static int pvr2_context_cleanup_flag;
static int pvr2_context_cleaned_flag;
static struct task_struct *pvr2_context_thread_ptr;

+static DEFINE_MUTEX(pvr2_disconn_mutex);
+static int pvr2_context_cleaning;

static void pvr2_context_set_notify(struct pvr2_context *mp, int fl)
{
@@ -152,6 +154,9 @@ static int pvr2_context_thread_func(void

pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context thread start");

+ mutex_lock(&pvr2_disconn_mutex);
+ pvr2_context_cleaning = 1;
+ mutex_unlock(&pvr2_disconn_mutex);
do {
while ((mp = pvr2_context_notify_first) != NULL) {
pvr2_context_set_notify(mp, 0);
@@ -163,6 +168,9 @@ static int pvr2_context_thread_func(void
pvr2_context_shutok()));
} while (!pvr2_context_shutok());

+ mutex_lock(&pvr2_disconn_mutex);
+ pvr2_context_cleaning = 0;
+ mutex_unlock(&pvr2_disconn_mutex);
pvr2_context_cleaned_flag = !0;
wake_up(&pvr2_context_cleanup_data);

@@ -266,9 +274,14 @@ static void pvr2_context_exit(struct pvr

void pvr2_context_disconnect(struct pvr2_context *mp)
{
+ mutex_lock(&pvr2_disconn_mutex);
+ if (pvr2_context_cleaning)
+ goto out;
pvr2_hdw_disconnect(mp->hdw);
mp->disconnect_flag = !0;
pvr2_context_notify(mp);
+out:
+ mutex_unlock(&pvr2_disconn_mutex);
}


--

syzbot

unread,
Sep 28, 2023, 7:36:14 AM9/28/23
to hda...@sina.com, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+621409...@syzkaller.appspotmail.com

Tested on:

commit: 633b47cb Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=103d5e12680000
kernel config: https://syzkaller.appspot.com/x/.config?x=acc0013b40e239a2
dashboard link: https://syzkaller.appspot.com/bug?extid=621409285c4156a009b3
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=14381d0a680000

Note: testing is done by a robot and is best-effort only.

Ricardo B. Marliere

unread,
Sep 28, 2023, 8:17:57 AM9/28/23
to Hillf Danton, syzbot, linux-...@vger.kernel.org, syzkall...@googlegroups.com
Good one, but make sure to test against Greg usb-testing tree!

Thanks,
- Ricardo

Ricardo B. Marliere

unread,
Oct 6, 2023, 8:17:11 AM10/6/23
to syzbot, is...@pobox.com, linux-...@vger.kernel.org, linux...@vger.kernel.org, linu...@vger.kernel.org, mch...@kernel.org, pvr...@isely.net, syzkall...@googlegroups.com
#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git 1053c4a4b8fcbd28386e80347e7c82d4d617e352

syzbot

unread,
Oct 6, 2023, 8:42:30 AM10/6/23
to is...@pobox.com, linux-...@vger.kernel.org, linux...@vger.kernel.org, linu...@vger.kernel.org, mch...@kernel.org, pvr...@isely.net, ric...@marliere.net, syzkall...@googlegroups.com
Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Read in pvr2_context_set_notify

pvrusb2: Important functionality might not be entirely working.
pvrusb2: Please consider contacting the driver author to help with further stabilization of the driver.
pvrusb2: **********
usb 1-1: USB disconnect, device number 3
pvrusb2: Device being rendered inoperable
==================================================================
BUG: KASAN: slab-use-after-free in pvr2_context_set_notify+0x2c4/0x310 drivers/media/usb/pvrusb2/pvrusb2-context.c:35
Read of size 4 at addr ffff88812c3e68d8 by task kworker/0:2/699

CPU: 0 PID: 699 Comm: kworker/0:2 Not tainted 6.6.0-rc4-syzkaller-00064-g1053c4a4b8fc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xc4/0x620 mm/kasan/report.c:475
kasan_report+0xda/0x110 mm/kasan/report.c:588
pvr2_context_set_notify+0x2c4/0x310 drivers/media/usb/pvrusb2/pvrusb2-context.c:35
pvr_disconnect+0x80/0xf0 drivers/media/usb/pvrusb2/pvrusb2-main.c:79
usb_unbind_interface+0x1dd/0x8d0 drivers/usb/core/driver.c:458
device_remove drivers/base/dd.c:569 [inline]
device_remove+0x11f/0x170 drivers/base/dd.c:561
__device_release_driver drivers/base/dd.c:1272 [inline]
device_release_driver_internal+0x44a/0x610 drivers/base/dd.c:1295
bus_remove_device+0x22c/0x420 drivers/base/bus.c:574
device_del+0x39a/0xa50 drivers/base/core.c:3813
usb_disable_device+0x36c/0x7f0 drivers/usb/core/message.c:1416
usb_disconnect+0x2e1/0x890 drivers/usb/core/hub.c:2252
hub_port_connect drivers/usb/core/hub.c:5280 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5580 [inline]
port_event drivers/usb/core/hub.c:5740 [inline]
hub_event+0x1be0/0x4f30 drivers/usb/core/hub.c:5822
process_one_work+0x884/0x15c0 kernel/workqueue.c:2630
process_scheduled_works kernel/workqueue.c:2703 [inline]
worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
kthread+0x33c/0x440 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
</TASK>

Allocated by task 699:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x87/0x90 mm/kasan/common.c:383
kmalloc include/linux/slab.h:599 [inline]
kzalloc include/linux/slab.h:720 [inline]
pvr2_context_create+0x53/0x2a0 drivers/media/usb/pvrusb2/pvrusb2-context.c:207
Freed by task 902:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x13c/0x190 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1800 [inline]
slab_free_freelist_hook mm/slub.c:1826 [inline]
slab_free mm/slub.c:3809 [inline]
__kmem_cache_free+0xff/0x330 mm/slub.c:3822
pvr2_context_check drivers/media/usb/pvrusb2/pvrusb2-context.c:137 [inline]
pvr2_context_thread_func+0x69d/0x960 drivers/media/usb/pvrusb2/pvrusb2-context.c:158
kthread+0x33c/0x440 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304

The buggy address belongs to the object at ffff88812c3e6800
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 216 bytes inside of
freed 256-byte region [ffff88812c3e6800, ffff88812c3e6900)

The buggy address belongs to the physical page:
page:ffffea0004b0f980 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12c3e6
head:ffffea0004b0f980 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x200000000000840(slab|head|node=0|zone=2)
page_type: 0xffffffff()
raw: 0200000000000840 ffff888100041b40 ffffea0004722a80 dead000000000004
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 699, tgid 699 (kworker/0:2), ts 149486728006, free_ts 149464487231
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1536
prep_new_page mm/page_alloc.c:1543 [inline]
get_page_from_freelist+0x10e1/0x2fd0 mm/page_alloc.c:3170
__alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4426
alloc_pages+0x1a9/0x270 mm/mempolicy.c:2297
alloc_slab_page mm/slub.c:1870 [inline]
allocate_slab+0x251/0x380 mm/slub.c:2017
new_slab mm/slub.c:2070 [inline]
___slab_alloc+0x8c7/0x1580 mm/slub.c:3223
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322
__slab_alloc_node mm/slub.c:3375 [inline]
slab_alloc_node mm/slub.c:3468 [inline]
__kmem_cache_alloc_node+0x12c/0x310 mm/slub.c:3517
kmalloc_trace+0x25/0xe0 mm/slab_common.c:1114
kmalloc include/linux/slab.h:599 [inline]
kzalloc include/linux/slab.h:720 [inline]
pvr2_context_create+0x53/0x2a0 drivers/media/usb/pvrusb2/pvrusb2-context.c:207
pvr_probe+0x25/0xe0 drivers/media/usb/pvrusb2/pvrusb2-main.c:54
usb_probe_interface+0x307/0x930 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x234/0xc90 drivers/base/dd.c:658
__driver_probe_device+0x1de/0x4b0 drivers/base/dd.c:800
driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:830
__device_attach_driver+0x1d4/0x300 drivers/base/dd.c:958
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1136 [inline]
free_unref_page_prepare+0x460/0xa20 mm/page_alloc.c:2312
free_unref_page+0x33/0x2c0 mm/page_alloc.c:2405
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x4a/0x70 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook mm/slab.h:762 [inline]
slab_alloc_node mm/slub.c:3478 [inline]
__kmem_cache_alloc_node+0x190/0x310 mm/slub.c:3517
__do_kmalloc_node mm/slab_common.c:1022 [inline]
__kmalloc+0x4f/0x100 mm/slab_common.c:1036
kmalloc include/linux/slab.h:603 [inline]
tomoyo_realpath_from_path+0xb9/0x710 security/tomoyo/realpath.c:251
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_number_perm+0x241/0x580 security/tomoyo/file.c:723
security_file_ioctl+0x72/0xb0 security/security.c:2647
__do_sys_ioctl fs/ioctl.c:865 [inline]
__se_sys_ioctl fs/ioctl.c:857 [inline]
__x64_sys_ioctl+0xbb/0x210 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
ffff88812c3e6780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88812c3e6800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88812c3e6880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88812c3e6900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88812c3e6980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


Tested on:

commit: 1053c4a4 Revert "usb: gadget: uvc: stop pump thread on..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
console output: https://syzkaller.appspot.com/x/log.txt?x=1472423a680000
kernel config: https://syzkaller.appspot.com/x/.config?x=a5e01246f94ceed9
dashboard link: https://syzkaller.appspot.com/bug?extid=621409285c4156a009b3
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Ricardo B. Marliere

unread,
Oct 12, 2023, 6:07:30 PM10/12/23
to syzbot, is...@pobox.com, linux-...@vger.kernel.org, linux...@vger.kernel.org, linu...@vger.kernel.org, mch...@kernel.org, pvr...@isely.net, syzkall...@googlegroups.com
0001-media-pvrusb2-fix-use-after-free-on-context-disconne.patch

syzbot

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Oct 12, 2023, 6:54:27 PM10/12/23
to is...@pobox.com, linux-...@vger.kernel.org, linux...@vger.kernel.org, linu...@vger.kernel.org, mch...@kernel.org, pvr...@isely.net, ric...@marliere.net, syzkall...@googlegroups.com
Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+621409...@syzkaller.appspotmail.com

Tested on:

commit: ce9ecca0 Linux 6.6-rc2
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
console output: https://syzkaller.appspot.com/x/log.txt?x=10be5209680000
kernel config: https://syzkaller.appspot.com/x/.config?x=59eae8406319284a
dashboard link: https://syzkaller.appspot.com/bug?extid=621409285c4156a009b3
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=131dd84d680000
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