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=-0.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 CB6D0C43382 for ; Fri, 28 Sep 2018 14:45:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6D2C020652 for ; Fri, 28 Sep 2018 14:45:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6D2C020652 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728873AbeI1VJL (ORCPT ); Fri, 28 Sep 2018 17:09:11 -0400 Received: from mail-io1-f69.google.com ([209.85.166.69]:38554 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726867AbeI1VJL (ORCPT ); Fri, 28 Sep 2018 17:09:11 -0400 Received: by mail-io1-f69.google.com with SMTP id n17-v6so6332406ioa.5 for ; Fri, 28 Sep 2018 07:45:04 -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=XzYva1YRWHbAy7ylNgi8uwSu1j8QEcuwkMcsohAye94=; b=CrlWIuTlgjRf1KZJXmuP59pFg93tO89iTleO5WS158XSlsUcQj5XrfAjb3taRsZNCP SaxKuCuQ+R7YpfIa6gyuEi+mCltuG4+gKG9HeKp2Uauxktv+PlTK+WlDh0lt8atC1rs+ qP0IDhApbzQ1Ku9be9JfeTv61JshA0bV0jNd08ImCufEC1dcXHT/6I2LPeZEDI43LaXu 6jBMLEYwAR9KCClznjtDxqGjTc2KMs5qE+TIX0RzhBo/e5jWkHAWY/nhUeHSPlGopggZ 7WIpj5Y98mgcXog1Fs2KdDzlsSj3kNVXVlyjhOxQPl3Q54wYKxKwc2UXNP3QKBhhxC/K NGZA== X-Gm-Message-State: ABuFfog9GAz2NqP3h1NzVS6I2jNOV2XMW6rHbB9ivgCL/f6XqWXy4I2P OdRKAgiKFKiMOYqdSvoug2JpZuTepShvFP9T9P/dRkurnsIs X-Google-Smtp-Source: ACcGV62a759w5C739yE6lbp/v8Ovx0+iQFcgBvvt70eqmgsIYh3W+in9VY79ONED/4gNzo3kNE1fqJwscQQnESrXPQvyDtvGfg6F MIME-Version: 1.0 X-Received: by 2002:a24:a0cb:: with SMTP id o194-v6mr1950832ite.36.1538145903986; Fri, 28 Sep 2018 07:45:03 -0700 (PDT) Date: Fri, 28 Sep 2018 07:45:03 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000003852440576ef80b2@google.com> Subject: KASAN: slab-out-of-bounds Read in string (2) From: syzbot To: linux-kernel@vger.kernel.org, pmladek@suse.com, rostedt@goodmis.org, sergey.senozhatsky@gmail.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: c127e59bee3e Merge tag 'for_v4.19-rc6' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13b2f32a400000 kernel config: https://syzkaller.appspot.com/x/.config?x=dfb440e26f0a6f6f dashboard link: https://syzkaller.appspot.com/bug?extid=376cea2b0ef340db3dd4 compiler: gcc (GCC) 8.0.1 20180413 (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+376cea2b0ef340db3dd4@syzkaller.appspotmail.com RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000140 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0e714a76d4 R13: 00000000004c32cb R14: 00000000004d4ef0 R15: 0000000000000004 ================================================================== BUG: KASAN: slab-out-of-bounds in string+0x298/0x2d0 lib/vsprintf.c:604 Read of size 1 at addr ffff8801c36c66ba by task syz-executor2/27811 CPU: 0 PID: 27811 Comm: syz-executor2 Not tainted 4.19.0-rc5+ #36 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+0x1c4/0x2b4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 string+0x298/0x2d0 lib/vsprintf.c:604 vsnprintf+0x48e/0x1b60 lib/vsprintf.c:2293 vscnprintf+0x2d/0x80 lib/vsprintf.c:2396 vprintk_store+0x43/0x510 kernel/printk/printk.c:1847 vprintk_emit+0x1c1/0x930 kernel/printk/printk.c:1905 vprintk_default+0x28/0x30 kernel/printk/printk.c:1963 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1996 ovl_lookup_index.cold.15+0xe8/0x1f8 fs/overlayfs/namei.c:689 ovl_lookup+0x9f2/0x29c0 fs/overlayfs/namei.c:1022 __lookup_hash+0x12e/0x190 fs/namei.c:1546 do_rmdir+0x3b3/0x630 fs/namei.c:3930 __do_sys_rmdir fs/namei.c:3959 [inline] __se_sys_rmdir fs/namei.c:3957 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3957 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457579 Code: 1d b4 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0e714a6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 00007f0e714a6c90 RCX: 0000000000457579 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000140 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0e714a76d4 R13: 00000000004c32cb R14: 00000000004d4ef0 R15: 0000000000000004 Allocated by task 27811: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc_array include/linux/slab.h:635 [inline] kcalloc include/linux/slab.h:646 [inline] ovl_get_index_name_fh+0x57/0x180 fs/overlayfs/namei.c:596 ovl_get_index_name+0x5c/0x80 fs/overlayfs/namei.c:631 ovl_lookup_index+0xe4/0x700 fs/overlayfs/namei.c:678 ovl_lookup+0x9f2/0x29c0 fs/overlayfs/namei.c:1022 __lookup_hash+0x12e/0x190 fs/namei.c:1546 do_rmdir+0x3b3/0x630 fs/namei.c:3930 __do_sys_rmdir fs/namei.c:3959 [inline] __se_sys_rmdir fs/namei.c:3957 [inline] __x64_sys_rmdir+0x36/0x40 fs/namei.c:3957 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 5441: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3813 __vunmap+0x335/0x460 mm/vmalloc.c:1532 vfree+0x68/0x100 mm/vmalloc.c:1593 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:870 [inline] get_entries net/ipv4/netfilter/ip_tables.c:1027 [inline] do_ipt_get_ctl+0x9eb/0xbc0 net/ipv4/netfilter/ip_tables.c:1703 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x80/0xe0 net/netfilter/nf_sockopt.c:122 ip_getsockopt+0x1af/0x240 net/ipv4/ip_sockglue.c:1577 tcp_getsockopt+0x93/0xe0 net/ipv4/tcp.c:3583 sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:2997 __sys_getsockopt+0x1ad/0x390 net/socket.c:1939 __do_sys_getsockopt net/socket.c:1950 [inline] __se_sys_getsockopt net/socket.c:1947 [inline] __x64_sys_getsockopt+0xbe/0x150 net/socket.c:1947 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801c36c6680 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 58 bytes inside of 64-byte region [ffff8801c36c6680, ffff8801c36c66c0) The buggy address belongs to the page: page:ffffea00070db180 count:1 mapcount:0 mapping:ffff8801da800340 index:0xffff8801c36c6380 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0006d16508 ffffea000638a588 ffff8801da800340 raw: ffff8801c36c6380 ffff8801c36c6000 000000010000001b 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c36c6580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801c36c6600: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ffff8801c36c6680: 00 00 00 00 00 00 00 02 fc fc fc fc fc fc fc fc ^ ffff8801c36c6700: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801c36c6780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== --- 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#bug-status-tracking for how to communicate with syzbot.