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,URIBL_BLOCKED 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 BF3E3C67790 for ; Mon, 9 Jul 2018 03:09:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7ABB4208DF for ; Mon, 9 Jul 2018 03:09:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7ABB4208DF 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 S933352AbeGIDJ4 (ORCPT ); Sun, 8 Jul 2018 23:09:56 -0400 Received: from mail-io0-f200.google.com ([209.85.223.200]:40464 "EHLO mail-io0-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754407AbeGIDJE (ORCPT ); Sun, 8 Jul 2018 23:09:04 -0400 Received: by mail-io0-f200.google.com with SMTP id r10-v6so15147428ioh.7 for ; Sun, 08 Jul 2018 20:09:04 -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=C5XOke2kXL8IixldaoCXa6uJcWfnENplScgshJg3ZRk=; b=b+BwODPQ6m+siuny8XMijj+ncqyKMdJk2f513Z86feEC38yGdFwCP839Zr3HRLeVM8 cVUIA+A8J6KUWdtNn1tczdIoDxirfik76Sh8kLFc5tV0QBKVwjRIXbulLFTGwD6BiHJm JWha+XuG0ch00oPIM2bUYkCoS8EU7+KBfQUUZswhPZAmIkfZ64t6EBGtaSvKgtNKqE8t phc3rZYQ3D55OulXVh3iSfGSrn52/gCpKDrYpR+5XKhoMRoZLbYbBbcVfhPdcozyWirj zf7w0WY7mmR8zcDvZumOexdy7mguxJCt7Dv8suQ92rDp6XMT0thorbaTD3IJp/lq03Dq k8gw== X-Gm-Message-State: APt69E0H2dQ4L8KFDKcFT3dFvcuTNk2kN9UdbDGmkeOo7YawvgrEwyyW Va1bAR4PEaws1+8gneqQsZQeNv7JdkVUVGOnIeRAxnMpFj8Q X-Google-Smtp-Source: AAOMgpeOzy0wos+cS8Z8RuJIriWXEGyUC+W2Kotmck/8amTBCJStdwN7p1H1ylevpzAkEnf5o9wXLbKVV0MGRge1xYZsMUdSqctW MIME-Version: 1.0 X-Received: by 2002:a24:d205:: with SMTP id z5-v6mr8102332itf.35.1531105743830; Sun, 08 Jul 2018 20:09:03 -0700 (PDT) Date: Sun, 08 Jul 2018 20:09:03 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000f98bc70570885526@google.com> Subject: KASAN: slab-out-of-bounds Read in fscache_alloc_cookie From: syzbot To: dhowells@redhat.com, linux-cachefs@redhat.com, linux-kernel@vger.kernel.org, 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: ca04b3cca11a Merge tag 'armsoc-fixes' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11e382e0400000 kernel config: https://syzkaller.appspot.com/x/.config?x=2ca6c7a31d407f86 dashboard link: https://syzkaller.appspot.com/bug?extid=a95b989b2dde8e806af8 compiler: gcc (GCC) 8.0.1 20180413 (experimental) userspace arch: i386 syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1097c6fc400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=152d29b2400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+a95b989b2dde8e806af8@syzkaller.appspotmail.com sshd (4453) used greatest stack depth: 17048 bytes left random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) ================================================================== BUG: KASAN: slab-out-of-bounds in fscache_set_key fs/fscache/cookie.c:120 [inline] BUG: KASAN: slab-out-of-bounds in fscache_alloc_cookie+0x7a9/0x880 fs/fscache/cookie.c:171 Read of size 4 at addr ffff8801d3cc8bb4 by task syz-executor907/4466 CPU: 1 PID: 4466 Comm: syz-executor907 Not tainted 4.18.0-rc3+ #40 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 fscache_set_key fs/fscache/cookie.c:120 [inline] fscache_alloc_cookie+0x7a9/0x880 fs/fscache/cookie.c:171 __fscache_acquire_cookie+0x230/0xb00 fs/fscache/cookie.c:303 fscache_acquire_cookie include/linux/fscache.h:338 [inline] v9fs_cache_session_get_cookie+0xc4/0x270 fs/9p/cache.c:73 v9fs_session_init+0x1013/0x1a80 fs/9p/v9fs.c:464 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 mount_fs+0xae/0x328 fs/super.c:1277 vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x581/0x30e0 fs/namespace.c:2848 __do_compat_sys_mount fs/compat.c:125 [inline] __se_compat_sys_mount fs/compat.c:92 [inline] __ia32_compat_sys_mount+0x5d5/0x860 fs/compat.c:92 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f17cb9 Code: 55 08 8b 88 64 cd ff ff 8b 98 68 cd ff ff 89 c8 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000ffafd7dc EFLAGS: 00000286 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000020000280 RDX: 00000000200002c0 RSI: 0000000000800000 RDI: 0000000020000340 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 4466: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] kzalloc include/linux/slab.h:707 [inline] fscache_set_key fs/fscache/cookie.c:101 [inline] fscache_alloc_cookie+0x701/0x880 fs/fscache/cookie.c:171 __fscache_acquire_cookie+0x230/0xb00 fs/fscache/cookie.c:303 fscache_acquire_cookie include/linux/fscache.h:338 [inline] v9fs_cache_session_get_cookie+0xc4/0x270 fs/9p/cache.c:73 v9fs_session_init+0x1013/0x1a80 fs/9p/v9fs.c:464 v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 mount_fs+0xae/0x328 fs/super.c:1277 vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x581/0x30e0 fs/namespace.c:2848 __do_compat_sys_mount fs/compat.c:125 [inline] __se_compat_sys_mount fs/compat.c:92 [inline] __ia32_compat_sys_mount+0x5d5/0x860 fs/compat.c:92 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline] do_fast_syscall_32+0x34d/0xfb2 arch/x86/entry/common.c:397 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 Freed by task 1: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 __kthread_create_on_node+0x34a/0x4c0 kernel/kthread.c:337 kthread_create_on_node+0xb1/0xe0 kernel/kthread.c:373 cryptomgr_schedule_test crypto/algboss.c:255 [inline] cryptomgr_notify+0x5ac/0xb90 crypto/algboss.c:276 notifier_call_chain+0x180/0x390 kernel/notifier.c:93 __blocking_notifier_call_chain kernel/notifier.c:317 [inline] blocking_notifier_call_chain+0x147/0x190 kernel/notifier.c:328 crypto_probing_notify+0x26/0x80 crypto/api.c:254 crypto_wait_for_test+0x42/0xe0 crypto/algapi.c:361 crypto_register_alg+0xc0/0xe0 crypto/algapi.c:392 crypto_register_shash+0x35/0x50 crypto/shash.c:494 crypto_register_shashes+0x5d/0xe0 crypto/shash.c:509 register_sha512_ssse3 arch/x86/crypto/sha512_ssse3_glue.c:136 [inline] sha512_ssse3_mod_init+0xc4/0x282 arch/x86/crypto/sha512_ssse3_glue.c:316 do_one_initcall+0x127/0x913 init/main.c:884 do_initcall_level init/main.c:952 [inline] do_initcalls init/main.c:960 [inline] do_basic_setup init/main.c:978 [inline] kernel_init_freeable+0x49b/0x58e init/main.c:1135 kernel_init+0x11/0x1b3 init/main.c:1061 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 The buggy address belongs to the object at ffff8801d3cc8b80 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 52 bytes inside of 64-byte region [ffff8801d3cc8b80, ffff8801d3cc8bc0) The buggy address belongs to the page: page:ffffea00074f3200 count:1 mapcount:0 mapping:ffff8801da800340 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea000750d208 ffffea00074b1f08 ffff8801da800340 raw: 0000000000000000 ffff8801d3cc8000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d3cc8a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801d3cc8b00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ffff8801d3cc8b80: 00 00 00 00 00 00 07 fc fc fc fc fc fc fc fc fc ^ ffff8801d3cc8c00: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff8801d3cc8c80: 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. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches