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[209.85.220.69]) by mx.google.com with SMTPS id i26sor16758045jaf.1.2019.08.10.11.15.06 for (Google Transport Security); Sat, 10 Aug 2019 11:15:06 -0700 (PDT) Received-SPF: pass (google.com: domain of 3qglpxqkbaokdjkvlwwpclaato.rzzrwpfdpcnzyepye.nzx@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) client-ip=209.85.220.69; Authentication-Results: mx.google.com; spf=pass (google.com: domain of 3qglpxqkbaokdjkvlwwpclaato.rzzrwpfdpcnzyepye.nzx@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=3qglPXQkbAOkdjkVLWWPcLaaTO.RZZRWPfdPcNZYePYe.NZX@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com X-Google-Smtp-Source: APXvYqzuX78j5MZdD9NknMDpWZDKRcpJUyudMpGZijC4CslADfAYaMDlmkJ3ExpZNosBtrPKqQzkTaBIJ6YYhsvueATdKqFCgLX8 MIME-Version: 1.0 X-Received: by 2002:a02:c6a9:: with SMTP id o9mr29951040jan.90.1565460906127; Sat, 10 Aug 2019 11:15:06 -0700 (PDT) Date: Sat, 10 Aug 2019 11:15:06 -0700 In-Reply-To: <0000000000005c056c058f9a5437@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000383acd058fc745d8@google.com> Subject: Re: BUG: bad usercopy in ld_usb_read From: syzbot To: akpm@linux-foundation.org, allison@lohutok.net, andreyknvl@google.com, cai@lca.pw, gregkh@linuxfoundation.org, keescook@chromium.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-usb@vger.kernel.org, mhund@ld-didactic.de, stern@rowland.harvard.edu, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: syzbot has found a reproducer for 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=17cf0b16600000 kernel config: https://syzkaller.appspot.com/x/.config?x=cfa2c18fb6a8068e dashboard link: https://syzkaller.appspot.com/bug?extid=45b2f40f0778cfa7634e compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=151bab16600000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=148f8cd2600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+45b2f40f0778cfa7634e@syzkaller.appspotmail.com ldusb 4-1:0.28: Read buffer overflow, -3222596215958809898 bytes dropped usercopy: Kernel memory exposure attempt detected from process stack (offset 0, size 2147479552)! ------------[ cut here ]------------ kernel BUG at mm/usercopy.c:98! invalid opcode: 0000 [#1] SMP KASAN CPU: 1 PID: 2023 Comm: syz-executor861 Not tainted 5.3.0-rc2+ #25 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 c1 f7 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 e0 f3 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 15 98 c1 ff <0f> 0b e8 95 f7 d6 ff e8 80 9f fd ff 8b 54 24 04 49 89 d8 4c 89 e1 RSP: 0018:ffff8881cbda7c40 EFLAGS: 00010282 RAX: 0000000000000061 RBX: ffffffff85cdf100 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8128a0fd RDI: ffffed10397b4f7a RBP: ffffffff85cdf2c0 R08: 0000000000000061 R09: fffffbfff11acda1 R10: fffffbfff11acda0 R11: ffffffff88d66d07 R12: ffffffff85cdf4e0 R13: ffffffff85cdf100 R14: 000000007ffff000 R15: ffffffff85cdf100 FS: 00007f10bb76a700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7135a49000 CR3: 00000001d20e8000 CR4: 00000000001406e0 Call Trace: __check_object_size mm/usercopy.c:276 [inline] __check_object_size.cold+0x91/0xba 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: 0033:0x446e19 Code: e8 ec e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 3b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f10bb769d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446e19 RDX: 00000000ffffffbc RSI: 0000000020000040 RDI: 0000000000000004 RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000000f R11: 0000000000000246 R12: 00000000006dbc3c R13: 0001002402090100 R14: 000048c920200f11 R15: 08983baa00000112 Modules linked in: ---[ end trace 93f3613883c53c00 ]--- RIP: 0010:usercopy_abort+0xb9/0xbb mm/usercopy.c:98 Code: e8 c1 f7 d6 ff 49 89 d9 4d 89 e8 4c 89 e1 41 56 48 89 ee 48 c7 c7 e0 f3 cd 85 ff 74 24 08 41 57 48 8b 54 24 20 e8 15 98 c1 ff <0f> 0b e8 95 f7 d6 ff e8 80 9f fd ff 8b 54 24 04 49 89 d8 4c 89 e1 RSP: 0018:ffff8881cbda7c40 EFLAGS: 00010282 RAX: 0000000000000061 RBX: ffffffff85cdf100 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8128a0fd RDI: ffffed10397b4f7a RBP: ffffffff85cdf2c0 R08: 0000000000000061 R09: fffffbfff11acda1 R10: fffffbfff11acda0 R11: ffffffff88d66d07 R12: ffffffff85cdf4e0 R13: ffffffff85cdf100 R14: 000000007ffff000 R15: ffffffff85cdf100 FS: 00007f10bb76a700(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7135a49000 CR3: 00000001d20e8000 CR4: 00000000001406e0