Hello,
syzbot found the following crash on:
HEAD commit: a55aa89a Linux 5.3-rc6
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12899ca2600000
kernel config: https://syzkaller.appspot.com/x/.config?x=2a6a2b9826fdadf9
dashboard link: https://syzkaller.appspot.com/bug?extid=4f11661279f916ba5627
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+4f11661279f916ba5627@xxxxxxxxxxxxxxxxxxxxxxxxx
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:359 [inline]
BUG: KASAN: slab-out-of-bounds in usb_hcd_poll_rh_status+0x423/0x6b0
drivers/usb/core/hcd.c:774
Write of size 2 at addr ffff8880a8e964c0 by task syz-executor.4/9841
CPU: 1 PID: 9841 Comm: syz-executor.4 Not tainted 5.3.0-rc6 #146
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351
__kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482
kasan_report+0x12/0x17 mm/kasan/common.c:618
check_memory_region_inline mm/kasan/generic.c:185 [inline]
check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
memcpy+0x38/0x50 mm/kasan/common.c:123
memcpy include/linux/string.h:359 [inline]
usb_hcd_poll_rh_status+0x423/0x6b0 drivers/usb/core/hcd.c:774
rh_timer_func+0x19/0x20 drivers/usb/core/hcd.c:800
call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322
expire_timers kernel/time/timer.c:1366 [inline]
__run_timers kernel/time/timer.c:1685 [inline]
__run_timers kernel/time/timer.c:1653 [inline]
run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698
__do_softirq+0x262/0x98c kernel/softirq.c:292
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x19b/0x1e0 kernel/softirq.c:413
exiting_irq arch/x86/include/asm/apic.h:537 [inline]
smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1133
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
</IRQ>
RIP: 0010:check_memory_region+0x1f/0x1a0 mm/kasan/generic.c:191
Code: 00 66 2e 0f 1f 84 00 00 00 00 00 48 85 f6 0f 84 34 01 00 00 48 b8 ff
ff ff ff ff 7f ff ff 55 0f b6 d2 48 39 c7 48 89 e5 41 55 <41> 54 53 0f 86
07 01 00 00 4c 8d 5c 37 ff 49 89 f8 48 b8 00 00 00
RSP: 0018:ffff88805ef17aa8 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff13
RAX: ffff7fffffffffff RBX: 0000000000000000 RCX: ffffffff873d1e85
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff897e2fc0
RBP: ffff88805ef17ab0 R08: 1ffffffff12fc5f8 R09: fffffbfff12fc5f9
R10: fffffbfff12fc5f8 R11: ffffffff897e2fc7 R12: fffffbfff134b5c6
R13: ffff88805ef0e2c0 R14: ffffffff897e2fc0 R15: 0000000000000000
__kasan_check_write+0x14/0x20 mm/kasan/common.c:98
atomic64_cmpxchg include/asm-generic/atomic-instrumented.h:1463 [inline]
atomic_long_cmpxchg_acquire include/asm-generic/atomic-long.h:418 [inline]
__mutex_trylock_or_owner kernel/locking/mutex.c:111 [inline]
__mutex_trylock kernel/locking/mutex.c:126 [inline]
__mutex_lock_common kernel/locking/mutex.c:932 [inline]
__mutex_lock+0x425/0x13c0 kernel/locking/mutex.c:1077
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1092
nf_sockopt_find.constprop.0+0x2d/0x290 net/netfilter/nf_sockopt.c:67
nf_sockopt net/netfilter/nf_sockopt.c:99 [inline]
nf_getsockopt+0x30/0xd0 net/netfilter/nf_sockopt.c:122
ip_getsockopt net/ipv4/ip_sockglue.c:1576 [inline]
ip_getsockopt+0x176/0x1d0 net/ipv4/ip_sockglue.c:1556
tcp_getsockopt net/ipv4/tcp.c:3665 [inline]
tcp_getsockopt+0x8f/0xe0 net/ipv4/tcp.c:3659
sock_common_getsockopt+0x94/0xd0 net/core/sock.c:3098
__sys_getsockopt+0x16d/0x310 net/socket.c:2129
__do_sys_getsockopt net/socket.c:2144 [inline]
__se_sys_getsockopt net/socket.c:2141 [inline]
__x64_sys_getsockopt+0xbe/0x150 net/socket.c:2141
do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c38a
Code: b8 34 01 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 dd 8c fb ff c3 66 2e 0f
1f 84 00 00 00 00 00 66 90 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff
ff 0f 83 ba 8c fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:0000000000a6f618 EFLAGS: 00000202 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000a6f640 RCX: 000000000045c38a
RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000714e80 R08: 0000000000a6f63c R09: 0000000000004000
R10: 0000000000a6f740 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000713380
Allocated by task 29984:
save_stack+0x23/0x90 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
__kasan_kmalloc mm/kasan/common.c:493 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:466
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:507
__do_kmalloc mm/slab.c:3655 [inline]
__kmalloc+0x163/0x770 mm/slab.c:3664
kmalloc include/linux/slab.h:557 [inline]
proc_bulk+0x2f5/0x7f0 drivers/usb/core/devio.c:1168
usbdev_do_ioctl+0x525/0x2d10 drivers/usb/core/devio.c:2443
usbdev_ioctl+0x26/0x30 drivers/usb/core/devio.c:2600
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:509 [inline]
do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl fs/ioctl.c:718 [inline]
__x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 25754:
save_stack+0x23/0x90 mm/kasan/common.c:69
set_track mm/kasan/common.c:77 [inline]
__kasan_slab_free+0x102/0x150 mm/kasan/common.c:455
kasan_slab_free+0xe/0x10 mm/kasan/common.c:463
__cache_free mm/slab.c:3425 [inline]
kfree+0x10a/0x2c0 mm/slab.c:3756
kvfree+0x61/0x70 mm/util.c:488
__vunmap+0x6c5/0x920 mm/vmalloc.c:2255
__vfree+0x41/0xd0 mm/vmalloc.c:2299
vfree+0x5f/0x90 mm/vmalloc.c:2329
copy_entries_to_user net/ipv4/netfilter/ip_tables.c:867 [inline]
get_entries net/ipv4/netfilter/ip_tables.c:1024 [inline]
do_ipt_get_ctl+0x71a/0x930 net/ipv4/netfilter/ip_tables.c:1700
nf_sockopt net/netfilter/nf_sockopt.c:104 [inline]
nf_getsockopt+0x7a/0xd0 net/netfilter/nf_sockopt.c:122
ip_getsockopt net/ipv4/ip_sockglue.c:1576 [inline]
ip_getsockopt+0x176/0x1d0 net/ipv4/ip_sockglue.c:1556
tcp_getsockopt net/ipv4/tcp.c:3665 [inline]
tcp_getsockopt+0x8f/0xe0 net/ipv4/tcp.c:3659
sock_common_getsockopt+0x94/0xd0 net/core/sock.c:3098
__sys_getsockopt+0x16d/0x310 net/socket.c:2129
__do_sys_getsockopt net/socket.c:2144 [inline]
__se_sys_getsockopt net/socket.c:2141 [inline]
__x64_sys_getsockopt+0xbe/0x150 net/socket.c:2141
do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff8880a8e964c0
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
32-byte region [ffff8880a8e964c0, ffff8880a8e964e0)
The buggy address belongs to the page:
page:ffffea0002a3a580 refcount:1 mapcount:0 mapping:ffff8880aa4001c0
index:0xffff8880a8e96fc1
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea000269fe08 ffffea000161c988 ffff8880aa4001c0
raw: ffff8880a8e96fc1 ffff8880a8e96000 000000010000003b 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a8e96380: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc
ffff8880a8e96400: 00 00 00 fc fc fc fc fc fb fb fb fb fc fc fc fc
ffff8880a8e96480: 00 00 fc fc fc fc fc fc 01 fc fc fc fc fc fc fc
^
ffff8880a8e96500: 00 00 fc fc fc fc fc fc 00 00 fc fc fc fc fc fc
ffff8880a8e96580: fb fb fb fb fc fc fc fc 00 00 00 fc fc fc fc fc
==================================================================
---
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