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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60A1DC433FE for ; Mon, 27 Sep 2021 17:13:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C9266135D for ; Mon, 27 Sep 2021 17:13:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236099AbhI0RPC (ORCPT ); Mon, 27 Sep 2021 13:15:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:56710 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237155AbhI0RN7 (ORCPT ); Mon, 27 Sep 2021 13:13:59 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DC7FA6135E; Mon, 27 Sep 2021 17:09:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632762588; bh=eu/bJfp63toC+D5pqX4MdCsMCvLXE0Eer14DHA2QUe8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rpJOmptdIVHLG1XmQ+IUNDx95QNwE9vC5+jKStD5PK+LlcXoLCD0FK8sgsHOmbZaO Nu67LvoJoyMr79SOpIKa1Ow3UNZwfM+q9frCo1U0RW6fCOL5iN9cQtdxQApJ+QI2RE zFVwb9iQEcFQ7oF0BY85wTObAynYmYlZOzNLgKv0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+f3e749d4c662818ae439@syzkaller.appspotmail.com, Bixuan Cui , Alexei Starovoitov , Yonghong Song , Sasha Levin Subject: [PATCH 5.10 080/103] bpf: Add oversize check before call kvcalloc() Date: Mon, 27 Sep 2021 19:02:52 +0200 Message-Id: <20210927170228.531386981@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210927170225.702078779@linuxfoundation.org> References: <20210927170225.702078779@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Bixuan Cui [ Upstream commit 0e6491b559704da720f6da09dd0a52c4df44c514 ] Commit 7661809d493b ("mm: don't allow oversized kvmalloc() calls") add the oversize check. When the allocation is larger than what kmalloc() supports, the following warning triggered: WARNING: CPU: 0 PID: 8408 at mm/util.c:597 kvmalloc_node+0x108/0x110 mm/util.c:597 Modules linked in: CPU: 0 PID: 8408 Comm: syz-executor221 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kvmalloc_node+0x108/0x110 mm/util.c:597 Call Trace: kvmalloc include/linux/mm.h:806 [inline] kvmalloc_array include/linux/mm.h:824 [inline] kvcalloc include/linux/mm.h:829 [inline] check_btf_line kernel/bpf/verifier.c:9925 [inline] check_btf_info kernel/bpf/verifier.c:10049 [inline] bpf_check+0xd634/0x150d0 kernel/bpf/verifier.c:13759 bpf_prog_load kernel/bpf/syscall.c:2301 [inline] __sys_bpf+0x11181/0x126e0 kernel/bpf/syscall.c:4587 __do_sys_bpf kernel/bpf/syscall.c:4691 [inline] __se_sys_bpf kernel/bpf/syscall.c:4689 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4689 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported-by: syzbot+f3e749d4c662818ae439@syzkaller.appspotmail.com Signed-off-by: Bixuan Cui Signed-off-by: Alexei Starovoitov Acked-by: Yonghong Song Link: https://lore.kernel.org/bpf/20210911005557.45518-1-cuibixuan@huawei.com Signed-off-by: Sasha Levin --- kernel/bpf/verifier.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index cba1f86e75cd..0c26757ea7fb 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -8822,6 +8822,8 @@ static int check_btf_line(struct bpf_verifier_env *env, nr_linfo = attr->line_info_cnt; if (!nr_linfo) return 0; + if (nr_linfo > INT_MAX / sizeof(struct bpf_line_info)) + return -EINVAL; rec_size = attr->line_info_rec_size; if (rec_size < MIN_BPF_LINEINFO_SIZE || -- 2.33.0