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Mon, 12 Aug 2019 08:23:05 -0400 Received: from mail-pg1-f195.google.com ([209.85.215.195]:43945 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728464AbfHLMXE (ORCPT ); Mon, 12 Aug 2019 08:23:04 -0400 Received: by mail-pg1-f195.google.com with SMTP id r26so13442576pgl.10 for ; Mon, 12 Aug 2019 05:23:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=+Yrr5TRQhtMjvmUVRktZffbutv+b/Mwyh6p99qPMK0c=; b=oSCN6p8kbKiqZ1SHDx9ov+yV0KhqKMOhSzqFVXodxTEpupeH2GwK2uIoOUZbehRLyC 4B6aH3NkUOACZBc1Ofp5jbUwZHP4hQxStLeAM8kWuRDdo/rrxG3W7EECCk62wLmdJyui hDBTf6xB0O2VuCEITPaJRSduyu1zvSJfRCbSu6LVpTJGbHgHyZAa26xjXjDoTnMF/iHk M8FmZsMakHnF4APU1hKU+mLqyZ2XDTm5id3mJQ+VD6mBalMqxo0Csc8G5oxEO1POfRY4 73mwv63uo73YONh9f9uIm/w357mAGwGqWhBWga9Rw/r5oT32JvbM71gFqJQBRZflzC8A 9QAw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=+Yrr5TRQhtMjvmUVRktZffbutv+b/Mwyh6p99qPMK0c=; b=jLtQO0NOtNdnEnUe412W4CSH0BWpY/kiRg/SMwudg1pkptn08YtjCp7WcNFX85zvV4 /pwnc5m7Ckkh6/eIQmZ+WXNWThkD/WaIHge+RcO70DSPAX+4y+kBPozcjj0MaDMlHyh3 pkiEME1V/9sctZEstR8h21UGPacr008PQ0FXUcb/Kts4L7ouCGiWZXvZvPg+pawa9Q1a H6Y61rdrW/+DPwDPyfcUJubMUlaJLmRZCvnBYKuzGIsaxbzU1r5Goc5/qy6eZMBwiZ7b CJoDfJ4kCSpki6sOYHX5pR3oxdXdgEvIhc5yYkCCxuW4NSxSYNndqn0Za61puRBcywV9 J+xg== X-Gm-Message-State: APjAAAXfDp7KjetbkNQdztv4NHFCG2+qRiPIWDI9wbHqwY3NDQQ7xrXk X4Fzvrmkweq+GzLq2qc9QEH2EYbAVIflhxFE8+gpiA== X-Google-Smtp-Source: APXvYqxVF2ANI+6npJzH68OlRua8gur8KCs+I6tq+yNeZ2bFH5W2uku+H4j0KcRgAVNd52sh5BcK2CqdlsokMgRAQVc= X-Received: by 2002:a65:4b8b:: with SMTP id t11mr29807691pgq.130.1565612583492; Mon, 12 Aug 2019 05:23:03 -0700 (PDT) MIME-Version: 1.0 References: <0000000000003c013f058fea8493@google.com> In-Reply-To: <0000000000003c013f058fea8493@google.com> From: Andrey Konovalov Date: Mon, 12 Aug 2019 14:22:52 +0200 Message-ID: Subject: Re: KASAN: slab-out-of-bounds Read in ld_usb_read To: syzbot Cc: Bjorn Helgaas , enric.balletbo@collabora.com, Greg Kroah-Hartman , kirr@nexedi.com, LKML , USB list , Guenter Roeck , lkundrak@v3.sk, logang@deltatee.com, syzkaller-bugs Content-Type: text/plain; charset="UTF-8" Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Mon, Aug 12, 2019 at 2:18 PM syzbot 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=162aac02600000 > kernel config: https://syzkaller.appspot.com/x/.config?x=cfa2c18fb6a8068e > dashboard link: https://syzkaller.appspot.com/bug?extid=ba00d6a2a24df57a94ca > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1123edc2600000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16079d2c600000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+ba00d6a2a24df57a94ca@syzkaller.appspotmail.com > > ldusb 1-1:0.28: Read buffer overflow, -131386046930688 bytes dropped > ================================================================== > BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x124/0x150 > lib/usercopy.c:27 > Read of size 2147479552 at addr ffff8881cd580008 by task > syz-executor268/1890 > > CPU: 0 PID: 1890 Comm: syz-executor268 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 > check_memory_region_inline mm/kasan/generic.c:185 [inline] > check_memory_region+0x128/0x190 mm/kasan/generic.c:192 > _copy_to_user+0x124/0x150 lib/usercopy.c:27 > copy_to_user include/linux/uaccess.h:152 [inline] > ld_usb_read+0x31a/0x780 drivers/usb/misc/ldusb.c:495 #syz dup: KASAN: use-after-free Read in ld_usb_release > __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: 0033:0x441c49 > Code: e8 8c e8 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 cb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007ffd920003d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441c49 > RDX: 00000000fffffd68 RSI: 0000000020000100 RDI: 0000000000000004 > RBP: 00000000000305b5 R08: 000000000000000f R09: 0000000000402a30 > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004029a0 > R13: 0000000000402a30 R14: 0000000000000000 R15: 0000000000000000 > > The buggy address belongs to the page: > page:ffffea0007356000 refcount:1 mapcount:0 mapping:0000000000000000 > index:0x0 compound_mapcount: 0 > flags: 0x200000000010000(head) > raw: 0200000000010000 dead000000000100 dead000000000122 0000000000000000 > raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8881cd595500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff8881cd595580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > > ffff8881cd595600: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe > ^ > ffff8881cd595680: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe > ffff8881cd595700: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe > ================================================================== > > > --- > 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@googlegroups.com. > > 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