From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 70223C3A5A2 for ; Tue, 3 Sep 2019 12:08:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4F784208E4 for ; Tue, 3 Sep 2019 12:08:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729241AbfICMIf (ORCPT ); Tue, 3 Sep 2019 08:08:35 -0400 Received: from mail-io1-f69.google.com ([209.85.166.69]:47557 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729149AbfICMIO (ORCPT ); Tue, 3 Sep 2019 08:08:14 -0400 Received: by mail-io1-f69.google.com with SMTP id b22so22814514iod.14 for ; Tue, 03 Sep 2019 05:08:13 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=tgPT8NGDcbb35Xhf3J+oxaW9sCed2F8A+7jWde6u69M=; b=VVQygTxLIkX4AiPgXhMRVsCC1/HbViZAEupe4mfuNJRrQ5tEgx0EO2hlFNkaAAGwqf 0prggUdp1/sCqOEdSHBiW1GRt+udewwwc+LdFw/7HAlVBWaSmuKa2u7VTVuR1Bx37s5f Blk1IhwGFY/O4imIjJLmuWC/UbQ8DiMrkEN7l8phRNXUEGh1qQEybvBCu4+AoxA9Clnw 9NVKR9JjRgoPPguzA1cZcKzjXLsD80EWbFQkkD0cQPvs8OKKlo/8qSvlacATa0pfYJkG zeWt2i1Hq/wn1AnUMd2On3uW93uaHWcbjQ5jXuW8N1H0bMVS+HxsVgqiS6AZqeqk3WQ4 pV1Q== X-Gm-Message-State: APjAAAUd2hrOvjTZ5qcM8iOPh41zri12L3O6VfTxADEFBuOxXmu3VTsI QGnDbLTcD9ePtZKlXSFhYEkrg8E+PKn63xdO2TR0GkoF4fVx X-Google-Smtp-Source: APXvYqzn2wlghzB32fMAGmvZ54UfE9VOjQ3Dvpms03LdA3HhIY/3dr2fsRyUceJs5gSNN+fO+T/0x7Fa/UHcyupP6T03uiDGtJH2 MIME-Version: 1.0 X-Received: by 2002:a02:2c6:: with SMTP id 189mr23573714jau.67.1567512493221; Tue, 03 Sep 2019 05:08:13 -0700 (PDT) Date: Tue, 03 Sep 2019 05:08:13 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000056ee310591a4f18a@google.com> Subject: KASAN: use-after-free Read in str_to_user From: syzbot To: andreyknvl@google.com, dmitry.torokhov@gmail.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, rydberg@bitmath.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: eea39f24 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=112b0312600000 kernel config: https://syzkaller.appspot.com/x/.config?x=d0c62209eedfd54e dashboard link: https://syzkaller.appspot.com/bug?extid=b1f387654f49043c302b 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+b1f387654f49043c302b@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in strlen+0x79/0x90 lib/string.c:525 Read of size 1 at addr ffff8881d642fc88 by task syz-executor.2/10208 CPU: 1 PID: 10208 Comm: syz-executor.2 Not tainted 5.3.0-rc5+ #28 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 strlen+0x79/0x90 lib/string.c:525 strlen include/linux/string.h:281 [inline] str_to_user+0x27/0x90 drivers/input/evdev.c:802 evdev_do_ioctl drivers/input/evdev.c:1205 [inline] evdev_ioctl_handler+0x1388/0x19e0 drivers/input/evdev.c:1303 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: 0033:0x459879 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:00007f4510becc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459879 RDX: 00000000200000c0 RSI: 0000000080404507 RDI: 0000000000000009 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4510bed6d4 R13: 00000000004c1aaf R14: 00000000004d4de0 R15: 00000000ffffffff Allocated by task 1601: 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 kmalloc include/linux/slab.h:552 [inline] syslog_print kernel/printk/printk.c:1346 [inline] do_syslog kernel/printk/printk.c:1519 [inline] do_syslog+0x540/0x1380 kernel/printk/printk.c:1493 kmsg_read+0x8a/0xb0 fs/proc/kmsg.c:40 proc_reg_read+0x1c1/0x280 fs/proc/inode.c:223 __vfs_read+0x76/0x100 fs/read_write.c:425 vfs_read+0x1ea/0x430 fs/read_write.c:461 ksys_read+0x127/0x250 fs/read_write.c:587 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 1601: 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:1474 [inline] slab_free mm/slub.c:3016 [inline] kfree+0xe4/0x2f0 mm/slub.c:3957 syslog_print kernel/printk/printk.c:1405 [inline] do_syslog kernel/printk/printk.c:1519 [inline] do_syslog+0x1098/0x1380 kernel/printk/printk.c:1493 kmsg_read+0x8a/0xb0 fs/proc/kmsg.c:40 proc_reg_read+0x1c1/0x280 fs/proc/inode.c:223 __vfs_read+0x76/0x100 fs/read_write.c:425 vfs_read+0x1ea/0x430 fs/read_write.c:461 ksys_read+0x127/0x250 fs/read_write.c:587 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 ffff8881d642fa80 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 520 bytes inside of 1024-byte region [ffff8881d642fa80, ffff8881d642fe80) The buggy address belongs to the page: page:ffffea0007590b00 refcount:1 mapcount:0 mapping:ffff8881da002280 index:0x0 compound_mapcount: 0 flags: 0x200000000010200(slab|head) raw: 0200000000010200 0000000000000000 0000000200000001 ffff8881da002280 raw: 0000000000000000 00000000000e000e 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d642fb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d642fc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff8881d642fc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881d642fd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d642fd80: 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@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.