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=-9.0 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS 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 78AC4C433E1 for ; Wed, 22 Jul 2020 18:32:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 63C2B20714 for ; Wed, 22 Jul 2020 18:32:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732300AbgGVScW (ORCPT ); Wed, 22 Jul 2020 14:32:22 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:48363 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726841AbgGVScV (ORCPT ); Wed, 22 Jul 2020 14:32:21 -0400 Received: by mail-io1-f71.google.com with SMTP id r9so2380898ioa.15 for ; Wed, 22 Jul 2020 11:32:21 -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=xqaFsWA4S2FWPTXvc0/32O9eUh5hZilXu7bDDZTt/Cc=; b=Pj8uiVAcSnqU/6HH6oPbJO3kgxbC7Bxyen6qK+GOXurbqNyKBOiVgEIKy8Au8mylq1 jqy8DnaJ8023k0QIeLBvas8mrYy83W4vGfVnq6nK1dSOAJWGorU/CHHR97YsHiA1O6I6 QpU+8zFnyPulbKUutVzaUBzr8VdhOx2k7gRu5096LE6q+JQn8RzZWxBSdAIF2YGgV8WM w7t51M+JH929EnKJzLZ/VNMoS2MAe59SxAZNtoaNSeiT790jJaCXUE8SCPKenA5yHUsj SnBxiERaWrJ3cWQOpPPtpcfeVI6AXJkokUBIist1kcbu8Lax+vCLNx+yAAwW9nkScKf5 JsOQ== X-Gm-Message-State: AOAM530n8QG22pKFEQzDG0TJ5s7D+JoZHSBjCXnAtWK/6ehhH48RwVme +AyO/T1ysEnbP+vNQAQXcARyOmWh0D77mNAgLO5zE/HfZdIZ X-Google-Smtp-Source: ABdhPJzZSBfQtty9MzAfVgmbdcLKZlsnr22g5NmaKUi2QoXu3cevorIQ758/IWj4bhj6Ih66zU02PmAecRMD3hnM05cLdOwBFbAW MIME-Version: 1.0 X-Received: by 2002:a05:6e02:de6:: with SMTP id m6mr1213270ilj.296.1595442740755; Wed, 22 Jul 2020 11:32:20 -0700 (PDT) Date: Wed, 22 Jul 2020 11:32:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000d282bd05ab0bf532@google.com> Subject: KASAN: slab-out-of-bounds Read in vsscanf (2) From: syzbot To: casey@schaufler-ca.com, jmorris@namei.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, serge@hallyn.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: f932d58a Merge tag 'scsi-fixes' of git://git.kernel.org/pu.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10337320900000 kernel config: https://syzkaller.appspot.com/x/.config?x=e944500a36bc4d55 dashboard link: https://syzkaller.appspot.com/bug?extid=a22c6092d003d6fe1122 compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15ce6d7d100000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1207c827100000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a22c6092d003d6fe1122@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in vsscanf+0x2666/0x2ef0 lib/vsprintf.c:3321 Read of size 1 at addr ffff888097d682b8 by task syz-executor980/6804 CPU: 0 PID: 6804 Comm: syz-executor980 Not tainted 5.8.0-rc5-syzkaller #0 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+0x1f0/0x31e lib/dump_stack.c:118 print_address_description+0x66/0x5a0 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report+0x132/0x1d0 mm/kasan/report.c:530 vsscanf+0x2666/0x2ef0 lib/vsprintf.c:3321 sscanf+0x6c/0x90 lib/vsprintf.c:3527 smk_set_cipso+0x374/0x6c0 security/smack/smackfs.c:908 vfs_write+0x2dd/0xc70 fs/read_write.c:576 ksys_write+0x11b/0x220 fs/read_write.c:631 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4402d9 Code: Bad RIP value. RSP: 002b:00007ffe89010db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402d9 RDX: 0000000000000037 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 0000000000000014 R09: 00000000004002c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401ae0 R13: 0000000000401b70 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 6804: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc_track_caller+0x249/0x320 mm/slab.c:3671 memdup_user_nul+0x26/0xf0 mm/util.c:259 smk_set_cipso+0xff/0x6c0 security/smack/smackfs.c:859 vfs_write+0x2dd/0xc70 fs/read_write.c:576 ksys_write+0x11b/0x220 fs/read_write.c:631 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 4906: save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x220 mm/slab.c:3757 tomoyo_path_number_perm+0x525/0x690 security/tomoyo/file.c:736 tomoyo_path_mknod+0x128/0x150 security/tomoyo/tomoyo.c:240 security_path_mknod+0xdc/0x160 security/security.c:1077 may_o_create fs/namei.c:2919 [inline] lookup_open fs/namei.c:3060 [inline] open_last_lookups fs/namei.c:3169 [inline] path_openat+0xbe8/0x37f0 fs/namei.c:3357 do_filp_open+0x191/0x3a0 fs/namei.c:3387 do_sys_openat2+0x463/0x770 fs/open.c:1179 do_sys_open fs/open.c:1195 [inline] ksys_open include/linux/syscalls.h:1388 [inline] __do_sys_open fs/open.c:1201 [inline] __se_sys_open fs/open.c:1199 [inline] __x64_sys_open+0x1af/0x1e0 fs/open.c:1199 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff888097d68280 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 56 bytes inside of 64-byte region [ffff888097d68280, ffff888097d682c0) The buggy address belongs to the page: page:ffffea00025f5a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888097d68c80 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000288fe08 ffffea00026f38c8 ffff8880aa400380 raw: ffff888097d68c80 ffff888097d68000 000000010000001e 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888097d68180: 00 00 00 00 01 fc fc fc fc fc fc fc fc fc fc fc ffff888097d68200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888097d68280: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ^ ffff888097d68300: 00 00 00 00 01 fc fc fc fc fc fc fc fc fc fc fc ffff888097d68380: 00 00 00 00 01 fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches