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=-7.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, 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 00706C433ED for ; Sun, 11 Apr 2021 03:08:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BA78E61019 for ; Sun, 11 Apr 2021 03:08:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234992AbhDKDId (ORCPT ); Sat, 10 Apr 2021 23:08:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48888 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234988AbhDKDId (ORCPT ); Sat, 10 Apr 2021 23:08:33 -0400 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 779D5C06138B; Sat, 10 Apr 2021 20:08:17 -0700 (PDT) Received: by mail-pl1-x630.google.com with SMTP id m18so2367501plc.13; Sat, 10 Apr 2021 20:08:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to:cc; bh=qedSlWxGiCLII+IY6dYIsnenXY5f1Uxz6dZxFBQc8IA=; b=IRCLqxHAe0jB3JpbCHU2A9hFPFuvXG7SfomyWAe2kA1jk/BiFC2zAgf4wDMKsfJmm9 g8cD6atl5bmxTCi4nXQ3bJwYO42ZTw5eoxOmIVNjIQSEuJMb6qYVI191wNDy4mrZKIrh CXJjNnh1anXqFv355XNRcdiD/3bF+eT9AbGCf693OmxpT0ifY6IdbsiTXkUqFDvPu/XG ZDY5rsKUGUCOf2hbOtaCMDP4guABnnV03y+NVimN+/VXZKplijIrYCu4zL8B2I0fI8IR mY3w+Dc1ZKAQBXccFmejpyF7LnsrUGfaHALRVkyUNAWQ7S7mx+BQTBGcXAO9SyQCsbaX HhfA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=qedSlWxGiCLII+IY6dYIsnenXY5f1Uxz6dZxFBQc8IA=; b=Pg0HHzkfpyY0F9LFe4RH5D/qDm6Sk+SehhwqYZJ3wf8V77xPZqANb0N2g8sOq6wCB9 777WXDuyxapy0g73VfqGk1Qv/IQvk5qfsjlwIMiDNCWCCln4AVmZ84hOcf4DfJPzdJgT DUZrYioxf9hRW1t/zXrRlD9ejwQ8U2B98Em89kMYmGjolrADgZXIYqnBCxTKkkZHXfBo UnEtm57VJz2bBOLcAveja6eGDNMIKZX64r4RMsxZq2pJoc5qw0yrrHJT3zz1Y7FYf+SO MODJkrxNRHLv96DWK64LeBybWXMYkAc4twArwLzcxs10m26lcyrNIa2urnjlPicn+Mw1 cK5Q== X-Gm-Message-State: AOAM532LzqJ8I1YwtRkxit+yjZLTr4hnLLKF5go/cyMTwdjs09i0aslK +s5QQh7E9KI7PH/BQsnSHwSjiOH6lXaOOCcGlBFQAK4XQckw X-Google-Smtp-Source: ABdhPJxy0J1aPTDqxPnWR5Hqt53cbRSqbJqEKHrQJ9m5Y6YEcf7y2hPFarSUFPdUIDwimCCW7PSlpWrhNAgXtENIC+c= X-Received: by 2002:a17:902:8601:b029:e6:7b87:8add with SMTP id f1-20020a1709028601b02900e67b878addmr19922157plo.3.1618110496735; Sat, 10 Apr 2021 20:08:16 -0700 (PDT) MIME-Version: 1.0 From: Hao Sun Date: Sun, 11 Apr 2021 11:08:13 +0800 Message-ID: Subject: BUG: unable to handle kernel NULL pointer dereference in io_uring_cancel_task_requests To: axboe@kernel.dk, io-uring@vger.kernel.org Cc: asml.silence@gmail.com, linux-kernel@vger.kernel.org Content-Type: multipart/mixed; boundary="0000000000005dcefe05bfa9b5df" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org --0000000000005dcefe05bfa9b5df Content-Type: text/plain; charset="UTF-8" Hi When using Healer(https://github.com/SunHao-0/healer/tree/dev) to fuzz the Linux kernel, I found a null-ptr-deref bug in io_uring_cancel_task_requests under fault injection condition, but I'm not sure about this. Sorry, I do not have a reproducing program for this bug. I hope that the stack trace information in the crash log can help you locate the problem. Here is the details: commit: 3b9cdafb5358eb9f3790de2f728f765fef100731 version: linux 5.11 git tree: upstream Full log can be found in the attachment. Fault injection log: FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 9161 Comm: executor Not tainted 5.11.0+ #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x137/0x194 lib/dump_stack.c:120 fail_dump lib/fault-inject.c:52 [inline] should_fail+0x23e/0x250 lib/fault-inject.c:146 should_fail_usercopy+0x16/0x20 lib/fault-inject-usercopy.c:37 _copy_from_user+0x1c/0xd0 lib/usercopy.c:14 copy_from_user include/linux/uaccess.h:192 [inline] set_user_sigmask+0x4b/0x110 kernel/signal.c:3015 io_cqring_wait+0x2e3/0x8b0 fs/io_uring.c:7250 __do_sys_io_uring_enter fs/io_uring.c:9480 [inline] __se_sys_io_uring_enter+0x8fc/0xb70 fs/io_uring.c:9397 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9397 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46a379 Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f046fa19c58 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: ffffffffffffffda RBX: 000000000078c080 RCX: 000000000046a379 RDX: 00000000000066ab RSI: 0000000000000001 RDI: 0000000000000003 RBP: 00007f046fa19c90 R08: 0000000020000040 R09: 0000000000000008 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 000000000078c080 R15: 00007fff769deef0 Crash log: BUG: kernel NULL pointer dereference, address: 0000000000000040 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 49954067 P4D 49954067 PUD 45f92067 PMD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 1 PID: 9161 Comm: executor Not tainted 5.11.0+ #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 RIP: 0010:io_uring_cancel_task_requests+0x3f/0x990 fs/io_uring.c:9045 Code: 48 8b 04 25 28 00 00 00 48 89 44 24 68 e8 89 e6 c5 ff 65 4c 8b 34 25 00 6d 01 00 49 8d 7c 24 40 48 89 7c 24 30 e8 81 97 d6 ff <41> 8b 5c 24 40 89 de 83 e6 02 31 ff e8 70 ea c5 ff 83 e3 02 48 89 RSP: 0018:ffffc90002a97b48 EFLAGS: 00010246 RAX: ffff88804b8e0d38 RBX: ffff88804b8ad700 RCX: 0000000000000764 RDX: 0000000000000040 RSI: ffff8880409d5140 RDI: 0000000000000040 RBP: ffff8880409d5140 R08: 0000000000000000 R09: 0000000000000043 R10: 0001ffffffffffff R11: ffff88804b8e0280 R12: 0000000000000000 R13: ffff8880409d5140 R14: ffff88804b8e0280 R15: ffff8880481c1800 FS: 00007f046fa1a700(0000) GS:ffff88807ec00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000040 CR3: 00000000479a5000 CR4: 0000000000750ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: __io_uring_files_cancel+0x9b/0x200 fs/io_uring.c:9140 io_uring_files_cancel include/linux/io_uring.h:65 [inline] do_exit+0x1a8/0x16d0 kernel/exit.c:780 do_group_exit+0xc5/0x180 kernel/exit.c:922 get_signal+0xd90/0x1470 kernel/signal.c:2773 arch_do_signal_or_restart+0x2a/0x260 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x109/0x1a0 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46a379 Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f046fa19cd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000078c080 RCX: 000000000046a379 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078c088 RBP: 000000000078c088 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c08c R13: 0000000000000000 R14: 000000000078c080 R15: 00007fff769deef0 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) CR2: 0000000000000040 ---[ end trace 613db1a25ecf6443 ]--- RIP: 0010:io_uring_cancel_task_requests+0x3f/0x990 fs/io_uring.c:9045 Code: 48 8b 04 25 28 00 00 00 48 89 44 24 68 e8 89 e6 c5 ff 65 4c 8b 34 25 00 6d 01 00 49 8d 7c 24 40 48 89 7c 24 30 e8 81 97 d6 ff <41> 8b 5c 24 40 89 de 83 e6 02 31 ff e8 70 ea c5 ff 83 e3 02 48 89 RSP: 0018:ffffc90002a97b48 EFLAGS: 00010246 RAX: ffff88804b8e0d38 RBX: ffff88804b8ad700 RCX: 0000000000000764 RDX: 0000000000000040 RSI: ffff8880409d5140 RDI: 0000000000000040 RBP: ffff8880409d5140 R08: 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