On Fri, Aug 9, 2019 at 8:18 PM syzbot <syzbot+f817d84b72194c4a5fe2@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: e96407b4 usb-fuzzer: main usb gadget fuzzer driver > git tree: https://github.com/google/kasan.git usb-fuzzer > console output: https://syzkaller.appspot.com/x/log.txt?x=126120e2600000 > kernel config: https://syzkaller.appspot.com/x/.config?x=cfa2c18fb6a8068e > dashboard link: https://syzkaller.appspot.com/bug?extid=f817d84b72194c4a5fe2 > 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+f817d84b72194c4a5fe2@xxxxxxxxxxxxxxxxxxxxxxxxx > > ================================================================== > BUG: KASAN: out-of-bounds in hidraw_ioctl+0x609/0xae0 > drivers/hid/hidraw.c:380 > Read of size 4 at addr ffff8881cb9fc018 by task syz-executor.1/3309 > > CPU: 1 PID: 3309 Comm: syz-executor.1 Not tainted 5.3.0-rc2+ #25 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0xca/0x13e lib/dump_stack.c:113 > print_address_description+0x6a/0x32c mm/kasan/report.c:351 > __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482 > kasan_report+0xe/0x12 mm/kasan/common.c:612 > hidraw_ioctl+0x609/0xae0 drivers/hid/hidraw.c:380 > vfs_ioctl fs/ioctl.c:46 [inline] > file_ioctl fs/ioctl.c:509 [inline] > do_vfs_ioctl+0xd2d/0x1330 fs/ioctl.c:696 > ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713 > __do_sys_ioctl fs/ioctl.c:720 [inline] > __se_sys_ioctl fs/ioctl.c:718 [inline] > __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718 > do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x459829 > Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 > 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff > ff 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007f877bde2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829 > RDX: 0000000020001300 RSI: 0000000080044801 RDI: 0000000000000004 > RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f877bde36d4 > R13: 00000000004c2206 R14: 00000000004d5610 R15: 00000000ffffffff > > Allocated by task 2751: > save_stack+0x1b/0x80 mm/kasan/common.c:69 > set_track mm/kasan/common.c:77 [inline] > __kasan_kmalloc mm/kasan/common.c:487 [inline] > __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460 > slab_post_alloc_hook mm/slab.h:520 [inline] > slab_alloc_node mm/slub.c:2766 [inline] > __kmalloc_node_track_caller+0xd0/0x230 mm/slub.c:4361 > __kmalloc_reserve.isra.0+0x39/0xe0 net/core/skbuff.c:141 > __alloc_skb+0xef/0x5a0 net/core/skbuff.c:209 > alloc_skb include/linux/skbuff.h:1055 [inline] > alloc_uevent_skb+0x7b/0x210 lib/kobject_uevent.c:289 > uevent_net_broadcast_untagged lib/kobject_uevent.c:325 [inline] > kobject_uevent_net_broadcast lib/kobject_uevent.c:408 [inline] > kobject_uevent_env+0x8ee/0x1160 lib/kobject_uevent.c:592 > device_del+0x6b2/0xb10 drivers/base/core.c:2298 > usb_disconnect+0x4c3/0x8d0 drivers/usb/core/hub.c:2225 > hub_port_connect drivers/usb/core/hub.c:4949 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5213 [inline] > port_event drivers/usb/core/hub.c:5359 [inline] > hub_event+0x1454/0x3640 drivers/usb/core/hub.c:5441 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > worker_thread+0x96/0xe20 kernel/workqueue.c:2415 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > > Freed by task 238: > save_stack+0x1b/0x80 mm/kasan/common.c:69 > set_track mm/kasan/common.c:77 [inline] > __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449 > slab_free_hook mm/slub.c:1423 [inline] > slab_free_freelist_hook mm/slub.c:1470 [inline] > slab_free mm/slub.c:3012 [inline] > kfree+0xe4/0x2f0 mm/slub.c:3953 > skb_free_head+0x8b/0xa0 net/core/skbuff.c:591 > skb_release_data+0x41f/0x7c0 net/core/skbuff.c:611 > skb_release_all+0x46/0x60 net/core/skbuff.c:665 > __kfree_skb net/core/skbuff.c:679 [inline] > consume_skb net/core/skbuff.c:838 [inline] > consume_skb+0xd9/0x320 net/core/skbuff.c:832 > skb_free_datagram+0x16/0xf0 net/core/datagram.c:328 > netlink_recvmsg+0x65e/0xee0 net/netlink/af_netlink.c:1996 > sock_recvmsg_nosec net/socket.c:871 [inline] > sock_recvmsg net/socket.c:889 [inline] > sock_recvmsg+0xca/0x110 net/socket.c:885 > ___sys_recvmsg+0x271/0x5a0 net/socket.c:2480 > __sys_recvmsg+0xe9/0x1b0 net/socket.c:2537 > do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > The buggy address belongs to the object at ffff8881cb9fc000 > which belongs to the cache kmalloc-1k of size 1024 > The buggy address is located 24 bytes inside of > 1024-byte region [ffff8881cb9fc000, ffff8881cb9fc400) > The buggy address belongs to the page: > page:ffffea00072e7f00 refcount:1 mapcount:0 mapping:ffff8881da002280 > index:0x0 compound_mapcount: 0 > flags: 0x200000000010200(slab|head) > raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da002280 > raw: 0000000000000000 00000000000e000e 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8881cb9fbf00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > ffff8881cb9fbf80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff > > ffff8881cb9fc000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ^ > ffff8881cb9fc080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8881cb9fc100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ================================================================== #syz dup: BUG: bad usercopy in hidraw_ioctl > > > --- > 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.
