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_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 6BCE8CA9EAC for ; Sat, 19 Oct 2019 05:23:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 294AF20854 for ; Sat, 19 Oct 2019 05:23:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727566AbfJSFXK (ORCPT ); Sat, 19 Oct 2019 01:23:10 -0400 Received: from mail-io1-f71.google.com ([209.85.166.71]:35096 "EHLO mail-io1-f71.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id 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X-Received: by 2002:a5d:9856:: with SMTP id p22mr12053973ios.29.1571462588703; Fri, 18 Oct 2019 22:23:08 -0700 (PDT) Date: Fri, 18 Oct 2019 22:23:08 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000060ad7d05953ca54f@google.com> Subject: KASAN: use-after-free Read in fuse_request_end From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, miklos@szeredi.hu, mszeredi@redhat.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: 283ea345 coccinelle: api/devm_platform_ioremap_resource: r.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13afce90e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=e0ac4d9b35046343 dashboard link: https://syzkaller.appspot.com/bug?extid=ae0bb7aae3de6b4594e2 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14018fa0e00000 The bug was bisected to: commit d49937749fef2597f6bcaf2a0ed67e88e347b7fb Author: Miklos Szeredi Date: Tue Sep 10 13:04:11 2019 +0000 fuse: stop copying args to fuse_req bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16110927600000 final crash: https://syzkaller.appspot.com/x/report.txt?x=15110927600000 console output: https://syzkaller.appspot.com/x/log.txt?x=11110927600000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+ae0bb7aae3de6b4594e2@syzkaller.appspotmail.com Fixes: d49937749fef ("fuse: stop copying args to fuse_req") ================================================================== BUG: KASAN: use-after-free in fuse_request_end+0x825/0x990 fs/fuse/dev.c:279 Read of size 8 at addr ffff8880a15b8468 by task syz-executor.0/8726 CPU: 0 PID: 8726 Comm: syz-executor.0 Not tainted 5.4.0-rc3+ #0 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.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 fuse_request_end+0x825/0x990 fs/fuse/dev.c:279 fuse_dev_do_read.isra.0+0x115b/0x1df0 fs/fuse/dev.c:1295 fuse_dev_read+0x165/0x200 fs/fuse/dev.c:1328 call_read_iter include/linux/fs.h:1889 [inline] new_sync_read+0x4d7/0x800 fs/read_write.c:414 __vfs_read+0xe1/0x110 fs/read_write.c:427 vfs_read+0x1f0/0x440 fs/read_write.c:461 ksys_read+0x14f/0x290 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read fs/read_write.c:595 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:595 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459a59 Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f764c086c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459a59 RDX: 00000000fffffed0 RSI: 00000000200030c0 RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f764c0876d4 R13: 00000000004c70e6 R14: 00000000004dca70 R15: 00000000ffffffff Allocated by task 8726: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 kmem_cache_alloc_trace+0x158/0x790 mm/slab.c:3550 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] fuse_send_init+0x48/0x440 fs/fuse/inode.c:974 fuse_fill_super+0x2a6/0x3a0 fs/fuse/inode.c:1257 vfs_get_super+0x13e/0x2e0 fs/super.c:1189 get_tree_nodev+0x23/0x30 fs/super.c:1219 fuse_get_tree+0x12e/0x190 fs/fuse/inode.c:1282 vfs_get_tree+0x8e/0x300 fs/super.c:1545 do_new_mount fs/namespace.c:2823 [inline] do_mount+0x143d/0x1d10 fs/namespace.c:3143 ksys_mount+0xdb/0x150 fs/namespace.c:3352 __do_sys_mount fs/namespace.c:3366 [inline] __se_sys_mount fs/namespace.c:3363 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3363 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8724: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 mm/slab.c:3756 process_init_reply+0xfb/0x1620 fs/fuse/inode.c:964 fuse_request_end+0x388/0x990 fs/fuse/dev.c:326 end_requests+0x16c/0x240 fs/fuse/dev.c:2049 fuse_abort_conn+0xa4d/0xdb0 fs/fuse/dev.c:2144 fuse_sb_destroy+0xa3/0x120 fs/fuse/inode.c:1325 fuse_kill_sb_anon+0x16/0x30 fs/fuse/inode.c:1336 deactivate_locked_super+0x95/0x100 fs/super.c:335 deactivate_super fs/super.c:366 [inline] deactivate_super+0x1b2/0x1d0 fs/super.c:362 cleanup_mnt+0x351/0x4c0 fs/namespace.c:1102 __cleanup_mnt+0x16/0x20 fs/namespace.c:1109 task_work_run+0x145/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a15b8400 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 104 bytes inside of 192-byte region [ffff8880a15b8400, ffff8880a15b84c0) The buggy address belongs to the page: page:ffffea0002856e00 refcount:1 mapcount:0 mapping:ffff8880aa400000 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000286d508 ffffea000285ba48 ffff8880aa400000 raw: 0000000000000000 ffff8880a15b8000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a15b8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a15b8380: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ffff8880a15b8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a15b8480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a15b8500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== --- 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#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches