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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 25B61C43381 for ; Sat, 16 Mar 2019 11:52:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DDF99218AC for ; Sat, 16 Mar 2019 11:52:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726713AbfCPLwH (ORCPT ); Sat, 16 Mar 2019 07:52:07 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:40021 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id 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MIME-Version: 1.0 X-Received: by 2002:a6b:3115:: with SMTP id j21mr5167822ioa.33.1552737124728; Sat, 16 Mar 2019 04:52:04 -0700 (PDT) Date: Sat, 16 Mar 2019 04:52:04 -0700 In-Reply-To: <00000000000052a5500584348100@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000bfc5f2058434c8dc@google.com> Subject: Re: KASAN: slab-out-of-bounds Read in linear_transfer From: syzbot To: alsa-devel-owner@alsa-project.org, alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org, perex@perex.cz, syzkaller-bugs@googlegroups.com, tiwai@suse.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 syzbot has found a reproducer for the following crash on: HEAD commit: 6c83d0d5 Merge branch 'for-linus-5.1-rc1' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1013cad7200000 kernel config: https://syzkaller.appspot.com/x/.config?x=7e1aaa1cfbfe1abf dashboard link: https://syzkaller.appspot.com/bug?extid=a39b5d3c50e55e24fb4d compiler: gcc (GCC) 9.0.0 20181231 (experimental) userspace arch: amd64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=113945fb200000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12ed3cf7200000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+a39b5d3c50e55e24fb4d@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:352 [inline] BUG: KASAN: slab-out-of-bounds in do_convert sound/core/oss/linear.c:48 [inline] BUG: KASAN: slab-out-of-bounds in convert sound/core/oss/linear.c:81 [inline] BUG: KASAN: slab-out-of-bounds in linear_transfer sound/core/oss/linear.c:110 [inline] BUG: KASAN: slab-out-of-bounds in linear_transfer+0x6de/0x970 sound/core/oss/linear.c:88 Read of size 1 at addr ffff88807ffcf3b8 by task syz-executor510/8466 CPU: 1 PID: 8466 Comm: syz-executor510 Not tainted 5.0.0+ #24 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 memcpy+0x24/0x50 mm/kasan/common.c:132 memcpy include/linux/string.h:352 [inline] do_convert sound/core/oss/linear.c:48 [inline] convert sound/core/oss/linear.c:81 [inline] linear_transfer sound/core/oss/linear.c:110 [inline] linear_transfer+0x6de/0x970 sound/core/oss/linear.c:88 snd_pcm_plug_read_transfer+0x1a1/0x2f0 sound/core/oss/pcm_plugin.c:651 snd_pcm_oss_read2+0x1f0/0x3f0 sound/core/oss/pcm_oss.c:1474 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1531 [inline] snd_pcm_oss_read+0x53a/0x6a0 sound/core/oss/pcm_oss.c:2751 __vfs_read+0x8d/0x110 fs/read_write.c:416 vfs_read+0x194/0x3e0 fs/read_write.c:452 ksys_read+0xea/0x1f0 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x446839 Code: e8 0c 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 5b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f018eea3db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446839 RDX: 0000000000001000 RSI: 00000000200012c0 RDI: 0000000000000003 RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c R13: 00007fff63b9986f R14: 00007f018eea49c0 R15: 0000000000000000 Allocated by task 8450: save_stack+0x45/0xd0 mm/kasan/common.c:75 set_track mm/kasan/common.c:87 [inline] __kasan_kmalloc mm/kasan/common.c:497 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:470 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:511 __do_kmalloc_node mm/slab.c:3686 [inline] __kmalloc_node+0x4e/0x70 mm/slab.c:3693 kmalloc_node include/linux/slab.h:588 [inline] kvmalloc_node+0x68/0x100 mm/util.c:430 kvmalloc include/linux/mm.h:605 [inline] kvzalloc include/linux/mm.h:613 [inline] snd_pcm_plugin_alloc+0x585/0x770 sound/core/oss/pcm_plugin.c:70 snd_pcm_plug_alloc+0x148/0x330 sound/core/oss/pcm_plugin.c:129 snd_pcm_oss_change_params_locked+0x2118/0x3750 sound/core/oss/pcm_oss.c:1038 snd_pcm_oss_change_params+0x7b/0xd0 sound/core/oss/pcm_oss.c:1101 snd_pcm_oss_get_active_substream+0x136/0x190 sound/core/oss/pcm_oss.c:1118 snd_pcm_oss_get_rate sound/core/oss/pcm_oss.c:1768 [inline] snd_pcm_oss_set_rate sound/core/oss/pcm_oss.c:1760 [inline] snd_pcm_oss_ioctl+0x8f7/0x3430 sound/core/oss/pcm_oss.c:2607 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 0: (stack is not available) The buggy address belongs to the object at ffff88807ffce800 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3000 bytes inside of 4096-byte region [ffff88807ffce800, ffff88807ffcf800) The buggy address belongs to the page: page:ffffea0001fff380 count:1 mapcount:0 mapping:ffff88812c3f0dc0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0001e65408 ffffea00027e2408 ffff88812c3f0dc0 raw: 0000000000000000 ffff88807ffce800 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88807ffcf280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807ffcf300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffff88807ffcf380: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ^ ffff88807ffcf400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807ffcf480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================