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=-3.7 required=3.0 tests=BAYES_00,FROM_LOCAL_DIGITS, 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 456C8C433FE for ; Thu, 10 Dec 2020 06:58:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0FDFD22D5B for ; Thu, 10 Dec 2020 06:58:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727852AbgLJG6v (ORCPT ); Thu, 10 Dec 2020 01:58:51 -0500 Received: from mail-il1-f200.google.com ([209.85.166.200]:45558 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387694AbgLJG6v (ORCPT ); Thu, 10 Dec 2020 01:58:51 -0500 Received: by mail-il1-f200.google.com with SMTP id x10so3551027ilq.12 for ; Wed, 09 Dec 2020 22:58:35 -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:in-reply-to:message-id:subject :from:to; bh=aaJCcC8Sm2rMoASehVPhtArVK1xTKmJbN46GqeFlACc=; b=WcEJUYEhr+ECLqJNfstDNlM8Y7sQsL6keZRIQu8qxrs3pvMbiOgGQmY1GgVnizy8l/ bEQH9J+aesR5/mb4u0VnsCfZt7iAuyWjjCas98OC6NdiHP+VbNPByAGBwt7Lhh2UoZsD rImEtSyQyzIBfsoXXE5IIVx17wPzsEOyz9bU11f016NPmy+f0rL/blGRBNoEwkJ6PHF3 TMz6b7jnYhytN2wjd62ZkTE4/f7O6MBg2liReXXgDtAW4iZCoxal/+QcYmhWLDihCeDy jtZOYTNJp6MFwtTWy7DHfbPdjl6XMh28g68+nhiZOWKCeiv8SBMZyPLTh+iJn1zRu3i9 tN+g== X-Gm-Message-State: AOAM530SD2K1pC7O7Rd1LNEBECevMKRd23uqFyZfhHlY0LHMmq921pO4 Sk3ulP1LiGhaMpuwwYMhkzQ+eyNFraqrxIv/5tYbd2HVee5K X-Google-Smtp-Source: ABdhPJyE32kAOjZX/8Ff5hJ1mHIx2zLec/RC3L+2S9Yo8qudw63GLqTcPzi8XX5qHvpZAu0ZDHsstR0eSihZyA5LziDZhlx75opp MIME-Version: 1.0 X-Received: by 2002:a6b:c3c5:: with SMTP id t188mr7341300iof.209.1607583490465; Wed, 09 Dec 2020 22:58:10 -0800 (PST) Date: Wed, 09 Dec 2020 22:58:10 -0800 In-Reply-To: <000000000000911d3905b459824c@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000e56a2605b616b2d9@google.com> Subject: Re: memory leak in bpf From: syzbot To: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@chromium.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, yhs@fb.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: a68a0262 mm/madvise: remove racy mm ownership check git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11facf17500000 kernel config: https://syzkaller.appspot.com/x/.config?x=4305fa9ea70c7a9f dashboard link: https://syzkaller.appspot.com/bug?extid=f3694595248708227d35 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=159a9613500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11bf7123500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f3694595248708227d35@syzkaller.appspotmail.com Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. executing program executing program executing program BUG: memory leak unreferenced object 0xffff88810efccc80 (size 64): comm "syz-executor334", pid 8460, jiffies 4294945724 (age 13.850s) hex dump (first 32 bytes): c0 cb 14 04 00 ea ff ff c0 c2 11 04 00 ea ff ff ................ c0 56 3f 04 00 ea ff ff 40 18 38 04 00 ea ff ff .V?.....@.8..... backtrace: [<0000000036ae98a7>] kmalloc_node include/linux/slab.h:575 [inline] [<0000000036ae98a7>] bpf_ringbuf_area_alloc kernel/bpf/ringbuf.c:94 [inline] [<0000000036ae98a7>] bpf_ringbuf_alloc kernel/bpf/ringbuf.c:135 [inline] [<0000000036ae98a7>] ringbuf_map_alloc kernel/bpf/ringbuf.c:183 [inline] [<0000000036ae98a7>] ringbuf_map_alloc+0x1be/0x410 kernel/bpf/ringbuf.c:150 [<00000000d2cb93ae>] find_and_alloc_map kernel/bpf/syscall.c:122 [inline] [<00000000d2cb93ae>] map_create kernel/bpf/syscall.c:825 [inline] [<00000000d2cb93ae>] __do_sys_bpf+0x7d0/0x30a0 kernel/bpf/syscall.c:4381 [<000000008feaf393>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 [<00000000e1f53cfd>] entry_SYSCALL_64_after_hwframe+0x44/0xa9