On Tue, Sep 17, 2019 at 02:20:55PM +0200, Andrey Konovalov wrote: > On Mon, Sep 16, 2019 at 8:49 PM syzbot > <syzbot+4cd8c1b2445d0ffe05f6@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > > > Hello, > > > > syzbot found the following crash on: > > > > HEAD commit: f0df5c1b 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=1681c9c1600000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5 > > dashboard link: https://syzkaller.appspot.com/bug?extid=4cd8c1b2445d0ffe05f6 > > 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+4cd8c1b2445d0ffe05f6@xxxxxxxxxxxxxxxxxxxxxxxxx > > > > ldusb 5-1:0.98: Read buffer overflow, 4466454212372071848 bytes dropped > > usercopy: Kernel memory exposure attempt detected from process stack > > (offset 0, size 536871625)! > > ------------[ cut here ]------------ > > kernel BUG at mm/usercopy.c:98! > > invalid opcode: 0000 [#1] SMP KASAN > > CPU: 1 PID: 17170 Comm: syz-executor.4 Not tainted 5.3.0-rc7+ #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > > Google 01/01/2011 > > RIP: 0010:usercopy_abort+0xb9/0xbb mm/usercopy.c:98 > > Code: e8 62 f0 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 c0 > > f7 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 c6 91 c1 ff <0f> 0b e8 36 f0 > > d6 ff e8 a1 90 fd ff 8b 54 24 04 49 89 d8 4c 89 e1 > > RSP: 0018:ffff8881d308fc40 EFLAGS: 00010282 > > RAX: 0000000000000060 RBX: ffffffff85cdf4e0 RCX: 0000000000000000 > > RDX: 0000000000000000 RSI: ffffffff81288ddd RDI: ffffed103a611f7a > > RBP: ffffffff85cdf6a0 R08: 0000000000000060 R09: fffffbfff11ad7a3 > > R10: fffffbfff11ad7a2 R11: ffffffff88d6bd17 R12: ffffffff85cdf8c0 > > R13: ffffffff85cdf4e0 R14: 00000000200002c9 R15: ffffffff85cdf4e0 > > FS: 00007fc613f93700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 00007f983cbbf000 CR3: 00000001cc33e000 CR4: 00000000001406e0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > Call Trace: > > __check_object_size mm/usercopy.c:276 [inline] > > __check_object_size.cold+0x91/0xbb mm/usercopy.c:250 > > check_object_size include/linux/thread_info.h:119 [inline] > > check_copy_size include/linux/thread_info.h:150 [inline] > > copy_to_user include/linux/uaccess.h:151 [inline] > > ld_usb_read+0x304/0x780 drivers/usb/misc/ldusb.c:495 > > __vfs_read+0x76/0x100 fs/read_write.c:425 > > vfs_read+0x1ea/0x430 fs/read_write.c:461 > > ksys_read+0x1e8/0x250 fs/read_write.c:587 > > do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296 > > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > RIP: 0033:0x4598e9 > > 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:00007fc613f92c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 > > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004598e9 > > RDX: 00000000200002c9 RSI: 0000000020000280 RDI: 0000000000000004 > > RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 > > R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc613f936d4 > > R13: 00000000004c6d1a R14: 00000000004dc0c0 R15: 00000000ffffffff > > Modules linked in: > > ---[ end trace b440da0257bb7015 ]--- > > RIP: 0010:usercopy_abort+0xb9/0xbb mm/usercopy.c:98 > > Code: e8 62 f0 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 c0 > > f7 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 c6 91 c1 ff <0f> 0b e8 36 f0 > > d6 ff e8 a1 90 fd ff 8b 54 24 04 49 89 d8 4c 89 e1 > > RSP: 0018:ffff8881d308fc40 EFLAGS: 00010282 > > RAX: 0000000000000060 RBX: ffffffff85cdf4e0 RCX: 0000000000000000 > > RDX: 0000000000000000 RSI: ffffffff81288ddd RDI: ffffed103a611f7a > > RBP: ffffffff85cdf6a0 R08: 0000000000000060 R09: fffffbfff11ad7a3 > > R10: fffffbfff11ad7a2 R11: ffffffff88d6bd17 R12: ffffffff85cdf8c0 > > R13: ffffffff85cdf4e0 R14: 00000000200002c9 R15: ffffffff85cdf4e0 > > FS: 00007fc613f93700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 00007f983cbbf000 CR3: 00000001cc33e000 CR4: 00000000001406e0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > > > > --- > > 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. > > Need to wait until all HID fixes are upstream, before we can actually > tell if this is a new issue or not. Duping to the Logitech bug for > now. > > #syz dup: general protection fault in __pm_runtime_resume Different bug (and driver). #syz dup: KASAN: slab-out-of-bounds Read in ld_usb_read (3)
