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 52DDEC4360F for ; Sat, 16 Feb 2019 08:05:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 21E63222D7 for ; Sat, 16 Feb 2019 08:05:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729605AbfBPIFE (ORCPT ); Sat, 16 Feb 2019 03:05:04 -0500 Received: from mail-it1-f197.google.com ([209.85.166.197]:57555 "EHLO mail-it1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727970AbfBPIFE (ORCPT ); Sat, 16 Feb 2019 03:05:04 -0500 Received: by mail-it1-f197.google.com with SMTP id n124so20103140itb.7 for ; Sat, 16 Feb 2019 00:05:03 -0800 (PST) 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=ATDW+1im1+6McfmFYNDyHPkRS2FcJXcAGn4j03Aw5xA=; b=j7ZTZJkjb2QnDTV3veqqPnWKHdHZWwvNqko7x+Am8xlxT/etYNPL1NvUiOQuvcf940 j5Yulaq2WXNBZEI3msstBUr0N5DTLgBdAmRebA69VND/ybXXaGfuz+oyda8EcA/n4w3G jXo4DCX90LMEML3j5LzPEQNUvZsxMzUIBzDwAmdNZg6pXf/pQdsGP7h/2wroXcBUIFjf Li7EOnT0jvXwhnRtWfoY3PrO6C3fJkVUzs52v5O3skxP2cKW6zodfSsORoZEThd0VgQh qKiLtkrLTOYemCTCmi1MyhZB8aoyfGsC5g/uonyzH2/JxluDJZTMzildLpBTNhCgI/k7 nWlA== X-Gm-Message-State: AHQUAuYuwyM4VMgz/fgtz9W5mhQ1JXgiJhYQ4CQ4fX2qTW5YBfjghuO0 qQtV8DJ72OGttWBP/Vnm2org4o6ECIi4TlS7vOfa1zicIDIC X-Google-Smtp-Source: AHgI3Ia92SHGf1uRvzKXxRULFuC5aOsfpJchL24HY98Qr8l6q1wKFAYqRekHkUXGhVmVXmxNRi9DW5FONKDfO/+LGphUSnyq5TUN MIME-Version: 1.0 X-Received: by 2002:a24:6c93:: with SMTP id w141mr7459266itb.35.1550304302976; Sat, 16 Feb 2019 00:05:02 -0800 (PST) Date: Sat, 16 Feb 2019 00:05:02 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000045d4f10581fe59a7@google.com> Subject: KASAN: use-after-free Read in shmem_fault From: syzbot To: hughd@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.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: aa0c38cf39de Merge branch 'fixes' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=146cadff400000 kernel config: https://syzkaller.appspot.com/x/.config?x=ee434566c893c7b1 dashboard link: https://syzkaller.appspot.com/bug?extid=56fbe62f8c55f860fd99 compiler: gcc (GCC) 9.0.0 20181231 (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+56fbe62f8c55f860fd99@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x30e0/0x4700 kernel/locking/lockdep.c:3215 Read of size 8 at addr ffff888098eda1a0 by task syz-executor.2/16643 CPU: 0 PID: 16643 Comm: syz-executor.2 Not tainted 5.0.0-rc6+ #68 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 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 __lock_acquire+0x30e0/0x4700 kernel/locking/lockdep.c:3215 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3841 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] shmem_fault+0x5b4/0x760 mm/shmem.c:1972 __do_fault+0x116/0x4e0 mm/memory.c:3019 do_read_fault mm/memory.c:3430 [inline] do_fault mm/memory.c:3556 [inline] handle_pte_fault mm/memory.c:3787 [inline] __handle_mm_fault+0x2cbd/0x3f20 mm/memory.c:3911 handle_mm_fault+0x43f/0xb30 mm/memory.c:3948 faultin_page mm/gup.c:535 [inline] __get_user_pages+0x7b6/0x1a40 mm/gup.c:738 populate_vma_page_range+0x20d/0x2a0 mm/gup.c:1247 __mm_populate+0x204/0x380 mm/gup.c:1295 mm_populate include/linux/mm.h:2388 [inline] vm_mmap_pgoff+0x213/0x230 mm/util.c:355 ksys_mmap_pgoff+0xf7/0x630 mm/mmap.c:1609 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e39 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe43bdebc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457e39 RDX: 0000000000000003 RSI: 0000000000b36000 RDI: 0000000020000000 RBP: 000000000073bf00 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 00007fe43bdec6d4 R13: 00000000004c3b9e R14: 00000000004d6c88 R15: 00000000ffffffff Allocated by task 16643: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc mm/kasan/common.c:504 [inline] kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411 kmem_cache_alloc+0x12d/0x710 mm/slab.c:3543 shmem_alloc_inode+0x1c/0x50 mm/shmem.c:3544 alloc_inode+0x66/0x190 fs/inode.c:210 new_inode_pseudo+0x19/0xf0 fs/inode.c:906 new_inode+0x1f/0x40 fs/inode.c:935 shmem_get_inode+0x84/0x780 mm/shmem.c:2148 __shmem_file_setup.part.0+0x1e2/0x2b0 mm/shmem.c:3900 __shmem_file_setup mm/shmem.c:3894 [inline] shmem_kernel_file_setup mm/shmem.c:3930 [inline] shmem_zero_setup+0xe2/0x474 mm/shmem.c:3974 mmap_region+0x136c/0x1760 mm/mmap.c:1802 do_mmap+0x8e2/0x1080 mm/mmap.c:1559 do_mmap_pgoff include/linux/mm.h:2379 [inline] vm_mmap_pgoff+0x1c5/0x230 mm/util.c:350 ksys_mmap_pgoff+0xf7/0x630 mm/mmap.c:1609 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 16: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3749 shmem_destroy_callback+0x6e/0xc0 mm/shmem.c:3555 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2452 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline] rcu_process_callbacks+0x928/0x1390 kernel/rcu/tree.c:2754 __do_softirq+0x266/0x95a kernel/softirq.c:292 The buggy address belongs to the object at ffff888098eda000 which belongs to the cache shmem_inode_cache(49:syz2) of size 1184 The buggy address is located 416 bytes inside of 1184-byte region [ffff888098eda000, ffff888098eda4a0) The buggy address belongs to the page: page:ffffea000263b680 count:1 mapcount:0 mapping:ffff888085ba8d80 index:0xffff888098edaffd flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000283a708 ffffea00029ce6c8 ffff888085ba8d80 raw: ffff888098edaffd ffff888098eda000 0000000100000001 ffff88805755e540 page dumped because: kasan: bad access detected page->mem_cgroup:ffff88805755e540 Memory state around the buggy address: ffff888098eda080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888098eda100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > ffff888098eda180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888098eda200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888098eda280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a bot. 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