On Thu, Mar 26, 2020 at 3:52 AM Qiujun Huang <anenbupt@xxxxxxxxx> wrote: > > #syz test: https://github.com/google/kasan.git e17994d1 Hi Qiujun, I've already duped this bug to "KASAN: slab-out-of-bounds Read in hfa384x_usbin_callback" since I had assumed they have the same root cause. Are those bugs different? We can undup if needed. Thanks! > > On Mon, Mar 23, 2020 at 8:39 PM syzbot > <syzbot+a57b24d359dc5577634a@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: e17994d1 usb: core: kcov: collect coverage from usb comple.. > > git tree: https://github.com/google/kasan.git usb-fuzzer > > console output: https://syzkaller.appspot.com/x/log.txt?x=15217373e00000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=5d64370c438bc60 > > dashboard link: https://syzkaller.appspot.com/bug?extid=a57b24d359dc5577634a > > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14a720ade00000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1467b755e00000 > > > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > > Reported-by: syzbot+a57b24d359dc5577634a@xxxxxxxxxxxxxxxxxxxxxxxxx > > > > ================================================================== > > BUG: KASAN: use-after-free in memcpy include/linux/string.h:381 [inline] > > BUG: KASAN: use-after-free in skb_put_data include/linux/skbuff.h:2284 [inline] > > BUG: KASAN: use-after-free in hfa384x_int_rxmonitor drivers/staging/wlan-ng/hfa384x_usb.c:3412 [inline] > > BUG: KASAN: use-after-free in hfa384x_usbin_rx drivers/staging/wlan-ng/hfa384x_usb.c:3312 [inline] > > BUG: KASAN: use-after-free in hfa384x_usbin_callback+0x1993/0x2360 drivers/staging/wlan-ng/hfa384x_usb.c:3026 > > Read of size 34945 at addr ffff8881cda9f33c by task swapper/0/0 > > > > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc5-syzkaller #0 > > 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+0xef/0x16e lib/dump_stack.c:118 > > print_address_description.constprop.0.cold+0xd3/0x314 mm/kasan/report.c:374 > > __kasan_report.cold+0x37/0x77 mm/kasan/report.c:506 > > kasan_report+0xe/0x20 mm/kasan/common.c:641 > > check_memory_region_inline mm/kasan/generic.c:185 [inline] > > check_memory_region+0x152/0x1c0 mm/kasan/generic.c:192 > > memcpy+0x20/0x50 mm/kasan/common.c:127 > > memcpy include/linux/string.h:381 [inline] > > skb_put_data include/linux/skbuff.h:2284 [inline] > > hfa384x_int_rxmonitor drivers/staging/wlan-ng/hfa384x_usb.c:3412 [inline] > > hfa384x_usbin_rx drivers/staging/wlan-ng/hfa384x_usb.c:3312 [inline] > > hfa384x_usbin_callback+0x1993/0x2360 drivers/staging/wlan-ng/hfa384x_usb.c:3026 > > __usb_hcd_giveback_urb+0x29a/0x550 drivers/usb/core/hcd.c:1650 > > usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1716 > > dummy_timer+0x1258/0x32ae drivers/usb/gadget/udc/dummy_hcd.c:1966 > > call_timer_fn+0x195/0x6f0 kernel/time/timer.c:1404 > > expire_timers kernel/time/timer.c:1449 [inline] > > __run_timers kernel/time/timer.c:1773 [inline] > > __run_timers kernel/time/timer.c:1740 [inline] > > run_timer_softirq+0x5f9/0x1500 kernel/time/timer.c:1786 > > __do_softirq+0x21e/0x950 kernel/softirq.c:292 > > invoke_softirq kernel/softirq.c:373 [inline] > > irq_exit+0x178/0x1a0 kernel/softirq.c:413 > > exiting_irq arch/x86/include/asm/apic.h:546 [inline] > > smp_apic_timer_interrupt+0x141/0x540 arch/x86/kernel/apic/apic.c:1146 > > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 > > </IRQ> > > RIP: 0010:default_idle+0x28/0x300 arch/x86/kernel/process.c:696 > > Code: cc cc 41 56 41 55 65 44 8b 2d 44 77 72 7a 41 54 55 53 0f 1f 44 00 00 e8 b6 62 b5 fb e9 07 00 00 00 0f 00 2d ea 0c 53 00 fb f4 <65> 44 8b 2d 20 77 72 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3 > > RSP: 0018:ffffffff87007d80 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 > > RAX: 0000000000000007 RBX: ffffffff8702cc40 RCX: 0000000000000000 > > RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff8702d48c > > RBP: fffffbfff0e05988 R08: ffffffff8702cc40 R09: 0000000000000000 > > R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > > R13: 0000000000000000 R14: ffffffff87e607c0 R15: 0000000000000000 > > cpuidle_idle_call kernel/sched/idle.c:154 [inline] > > do_idle+0x3e0/0x500 kernel/sched/idle.c:269 > > cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361 > > start_kernel+0xe16/0xe5a init/main.c:998 > > secondary_startup_64+0xb6/0xc0 arch/x86/kernel/head_64.S:242 > > > > The buggy address belongs to the page: > > page:ffffea000736a600 refcount:32769 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0 > > flags: 0x200000000010000(head) > > raw: 0200000000010000 dead000000000100 dead000000000122 0000000000000000 > > raw: 0000000000000000 0000000000000000 00008001ffffffff 0000000000000000 > > page dumped because: kasan: bad access detected > > > > Memory state around the buggy address: > > ffff8881cda9ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > > ffff8881cda9ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > > >ffff8881cdaa0000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ^ > > ffff8881cdaa0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ffff8881cdaa0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > > ================================================================== > > > > > > --- > > This bug 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 syzkaller@xxxxxxxxxxxxxxxx. > > > > syzbot will keep track of this bug report. See: > > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > syzbot can test patches for this bug, for details see: > > https://goo.gl/tpsmEJ#testing-patches
