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=-0.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 4D337C43612 for ; Fri, 28 Dec 2018 20:51:07 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id DA4FC2148E for ; Fri, 28 Dec 2018 20:51:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DA4FC2148E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4055F8E004D; Fri, 28 Dec 2018 15:51:06 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 3B4B38E0001; Fri, 28 Dec 2018 15:51:06 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2A3EB8E004D; Fri, 28 Dec 2018 15:51:06 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from mail-it1-f198.google.com (mail-it1-f198.google.com [209.85.166.198]) by kanga.kvack.org (Postfix) with ESMTP id 038AC8E0001 for ; Fri, 28 Dec 2018 15:51:06 -0500 (EST) Received: by mail-it1-f198.google.com with SMTP id j3so24670385itf.5 for ; Fri, 28 Dec 2018 12:51:05 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:mime-version :date:message-id:subject:from:to; bh=7GJPd699T2OEUSyjv/HWkvMwOUS9VoGfRBEouY+TfYg=; b=SjhVkUkODOM8TA0bxUo4GI6ppZ+QmfeXZUCSgBPN2poLjDCk+vv0RTRumHr/FJkHUQ hi8E+eFYyTAKZW96tV71icqQV8k/sfiDUwFNKyQ4RwS3polDitjSCSqd5AL9pICHdMGZ Z8sAj0vvMUAqDFXFX//fcBhJm5YzUFYohmygIPwiIPxor/g3prHmvB6Y5Vjr2L496jws ix4rXFbLtNTB1z/f/SAkvoaz9tVrSFYXi9nW0op9cz8Mow+zMfd6Zk9r3al3616lT+u7 6gLst2S3FgHDC6foKuvLcXa3MQtXHL8qIIfFBPhHEPeLD3aJfHe8vMDG+nX2QBWjAqvF oGww== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of 3uiwmxakbafmdjk5v66zcvaa3y.19916zfdzcx98ez8e.x97@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=3uIwmXAkbAFMDJK5v66zCvAA3y.19916zFDzCx98Ez8E.x97@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com X-Gm-Message-State: AA+aEWZ/k5Rm2uxq8VQDU7bdlZlibtn1g3VyVHahtRdnbdzyqqts+Trf 7rx2fVhBLB/gnePE5RY12SDmwU6qtsnAlPdcIuMtcbGmD6QlnVFU62qr9Fe5DOhyRXuOWFWyn1O LJNZ64sy3IKEffHAJDmfTw+X5Q+tDZQhQ41D4wzcDuNQ7NWjUa7gXdQSeor9PmAo7uvximdxpId HZohUGO8pf+0TzoAsbm0jF5dvmyU/0R2GR4IxlamU39a/jXC2kginx+sJfKmz+pBG9d2dvgFdwX 9+BrRQnbVv3Pv4ZNgj/IntuCU80+VWfuwVPD91gb33Dktfl7uN20xnFUdNsmDQyGVe+F1FAOnuE aF5JJllWyEKaiU1HGgz+K0j4Lm4UCs7MP3vJCyCHlG5SZ2GfifShIxSWp2vvovIosMgPKKVtdg= = X-Received: by 2002:a24:3987:: with SMTP id l129mr17721858ita.45.1546030265680; Fri, 28 Dec 2018 12:51:05 -0800 (PST) X-Received: by 2002:a24:3987:: with SMTP id l129mr17721817ita.45.1546030264540; Fri, 28 Dec 2018 12:51:04 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1546030264; cv=none; d=google.com; s=arc-20160816; b=AwHW4oUx3qAtE/IlOAwVj6mGiTr0TdEJVHVFC6z52GZ69O7IUsAK2yOr4zQvp9kZNg LzOsfWek2xqei6UkGzPIdqW94ntjG5lUKd8uoHaFuaSfMSgHhYEec5/CR4L3w0ob2DHV TYOxH149Y563k2ywWPBE3fZnvXFhyta8HzQLcvQIluuJ6vXKkoztDdeHOrPLcTiNy56B j3+jaeawhmdmpUwse4XrlJcupNSKenErDQuX1JHclF4iyoWfdYjrHP1S7Iqs27NTKleh tBjC7RIxDjKF8FjfVIXq8W+IB8GmBckghiwaiLWOS0MwLtzjFUFqZqS5wtuCs96tEck2 AOyA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=to:from:subject:message-id:date:mime-version; bh=7GJPd699T2OEUSyjv/HWkvMwOUS9VoGfRBEouY+TfYg=; b=y55FMHwCkKjqlg2plNa3aIAJaaj76fXCc9I5mpPdMF1Y06BT/UZIGnVB8weGa77rOz eLjehNRbq4csH8urBNC+4OwbUPyN37DHDGriKMbldgSBbZic0lNVc1/mX+NC288VhuCk yV4aPjhKfl8VCINS/dR7cGihlOM9zL51ruon4+UOheE0AlVJiAst9V+gkcE4q7qSycV8 EynmyO4LdXxUUm+T1Fu08xGsGbWA2JhwLgtA89FehkIcBmOGF3pN0KEXFziMPS43oe1F DI2/ZlGqe3nD8JsKjhdewOnbO+Z92AGDIyTfgXqA2v3PUBliEAxYqsMu6PsW7uk7Gmap OBrQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of 3uiwmxakbafmdjk5v66zcvaa3y.19916zfdzcx98ez8e.x97@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=3uIwmXAkbAFMDJK5v66zCvAA3y.19916zFDzCx98Ez8E.x97@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com Received: from mail-sor-f69.google.com (mail-sor-f69.google.com. [209.85.220.69]) by mx.google.com with SMTPS id v20sor23634487ita.10.2018.12.28.12.51.04 for (Google Transport Security); Fri, 28 Dec 2018 12:51:04 -0800 (PST) Received-SPF: pass (google.com: domain of 3uiwmxakbafmdjk5v66zcvaa3y.19916zfdzcx98ez8e.x97@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) client-ip=209.85.220.69; Authentication-Results: mx.google.com; spf=pass (google.com: domain of 3uiwmxakbafmdjk5v66zcvaa3y.19916zfdzcx98ez8e.x97@m3kw2wvrgufz5godrsrytgd7.apphosting.bounces.google.com designates 209.85.220.69 as permitted sender) smtp.mailfrom=3uIwmXAkbAFMDJK5v66zCvAA3y.19916zFDzCx98Ez8E.x97@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=appspotmail.com X-Google-Smtp-Source: ALg8bN49GFz+DPyXTiISRhP81qeKhmQ+Q7sXplWZBqXwahqFKgNwb6tLVK7I0hKaoOU0jv6yLHnYh2rjNCL3RNDWzpI7D0IWiBnM MIME-Version: 1.0 X-Received: by 2002:a24:138f:: with SMTP id 137mr21331000itz.18.1546030264185; Fri, 28 Dec 2018 12:51:04 -0800 (PST) Date: Fri, 28 Dec 2018 12:51:04 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b57d19057e1b383d@google.com> Subject: KASAN: use-after-free Read in filemap_fault From: syzbot To: akpm@linux-foundation.org, darrick.wong@oracle.com, hannes@cmpxchg.org, hughd@google.com, jack@suse.cz, josef@toxicpanda.com, jrdr.linux@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, sfr@canb.auug.org.au, syzkaller-bugs@googlegroups.com, willy@infradead.org Content-Type: text/plain; charset="UTF-8"; delsp="yes"; format="flowed" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Message-ID: <20181228205104.RuJCepQ-gUlRNkXV0gTKCkON6OTxtlffCLnWyRO85T0@z> Hello, syzbot found the following crash on: HEAD commit: 6a1d293238c1 Add linux-next specific files for 20181224 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=102ca567400000 kernel config: https://syzkaller.appspot.com/x/.config?x=f9369d117d073843 dashboard link: https://syzkaller.appspot.com/bug?extid=b437b5a429d680cf2217 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15f059b3400000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12ac602d400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+b437b5a429d680cf2217@syzkaller.appspotmail.com sshd (8177) used greatest stack depth: 15720 bytes left hrtimer: interrupt took 27544 ns ================================================================== BUG: KASAN: use-after-free in filemap_fault+0x2818/0x2a70 mm/filemap.c:2559 Read of size 8 at addr ffff8881b15026b0 by task syz-executor997/8196 CPU: 0 PID: 8196 Comm: syz-executor997 Not tainted 4.20.0-rc7-next-20181224 #188 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+0x1d3/0x2c6 lib/dump_stack.c:113 print_address_description.cold.5+0x9/0x1ff mm/kasan/report.c:187 kasan_report.cold.6+0x1b/0x39 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 filemap_fault+0x2818/0x2a70 mm/filemap.c:2559 ext4_filemap_fault+0x82/0xad fs/ext4/inode.c:6326 __do_fault+0x176/0x6f0 mm/memory.c:3013 do_shared_fault mm/memory.c:3479 [inline] do_fault mm/memory.c:3554 [inline] handle_pte_fault mm/memory.c:3781 [inline] __handle_mm_fault+0x373b/0x55f0 mm/memory.c:3905 handle_mm_fault+0x54f/0xc70 mm/memory.c:3942 do_user_addr_fault arch/x86/mm/fault.c:1475 [inline] __do_page_fault+0x5f6/0xd70 arch/x86/mm/fault.c:1541 do_page_fault+0xf2/0x7e0 arch/x86/mm/fault.c:1572 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1143 RIP: 0033:0x400a57 Code: 00 00 00 00 e8 ba 59 04 00 8b 03 85 c0 74 d8 c7 45 08 00 00 00 00 83 7d 04 05 0f 87 49 02 00 00 8b 45 04 ff 24 c5 e8 e4 4a 00 04 25 fa ff 00 20 2e 2f 62 75 66 c7 04 25 fe ff 00 20 73 00 b9 RSP: 002b:00007f48cd9c0dc0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 00000000006dbc28 RCX: 0000000000446409 RDX: 0000000000446409 RSI: 0000000000000081 RDI: 00000000006dbc2c RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c R13: 00007ffd0bb6676f R14: 00007f48cd9c19c0 R15: 00000000006dbd2c Allocated by task 8196: save_stack+0x43/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] kasan_kmalloc+0xcb/0xd0 mm/kasan/common.c:482 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:397 kmem_cache_alloc+0x130/0x730 mm/slab.c:3541 vm_area_alloc+0x7a/0x1d0 kernel/fork.c:331 mmap_region+0x9d7/0x1cd0 mm/mmap.c:1756 do_mmap+0xa22/0x1230 mm/mmap.c:1559 do_mmap_pgoff include/linux/mm.h:2421 [inline] vm_mmap_pgoff+0x213/0x2c0 mm/util.c:350 ksys_mmap_pgoff+0x4da/0x660 mm/mmap.c:1609 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:99 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:90 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:90 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8197: save_stack+0x43/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:444 kasan_slab_free+0xe/0x10 mm/kasan/common.c:452 __cache_free mm/slab.c:3485 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3747 vm_area_free+0x1c/0x20 kernel/fork.c:350 remove_vma+0x13a/0x180 mm/mmap.c:185 remove_vma_list mm/mmap.c:2585 [inline] __do_munmap+0x729/0xf50 mm/mmap.c:2822 do_munmap mm/mmap.c:2830 [inline] mmap_region+0x6a7/0x1cd0 mm/mmap.c:1729 do_mmap+0xa22/0x1230 mm/mmap.c:1559 do_mmap_pgoff include/linux/mm.h:2421 [inline] vm_mmap_pgoff+0x213/0x2c0 mm/util.c:350 ksys_mmap_pgoff+0x4da/0x660 mm/mmap.c:1609 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:99 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:90 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:90 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 ffff8881b1502670 which belongs to the cache vm_area_struct of size 200 The buggy address is located 64 bytes inside of 200-byte region [ffff8881b1502670, ffff8881b1502738) The buggy address belongs to the page: page:ffffea0006c54080 count:1 mapcount:0 mapping:ffff8881da9827c0 index:0xffff8881b1502eb0 flags: 0x2fffc0000000200(slab) raw: 02fffc0000000200 ffffea0007477408 ffffea0006c5ec48 ffff8881da9827c0 raw: ffff8881b1502eb0 ffff8881b1502040 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881b1502580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881b1502600: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fb fb > ffff8881b1502680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881b1502700: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc fb ffff8881b1502780: 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#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