From nobody Fri May 10 17:45:05 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1621173634; cv=none; d=zohomail.com; s=zohoarc; b=HKu5JXMee1lt2aL09/tzNOrJCQoUbhmvXjz6jsaD9WRsdV/3eT1+muDN4ecaLWx2zDAvoqXlEdWU+JYy712fbOE5ttfcRVYCtdo0dzWlIsoCnNLzLcAXYsOB++/NTfQ0Qy115X6gsT4VJk4krBIMk28JIhE9ktGd2TtI4GppaTo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1621173634; h=Content-Transfer-Encoding:Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:To; bh=lwFgkfiegTvUCCq9XMyB/9qIOAqIz3tB60NTjtV4nSE=; b=I40V94Wyti2Z+lg0TSXW2tKcRw3oVlBnFh76xnXhl/IrfhslxQClKsNdzmQyJvZNDT/TxJdZCS5C1GJ/pxKwkiD0+LJkuaoiG36pobG4YXjyOSNZvuIpQi+3nWqYPQ2H6Gpo5QhyDT2d231MMbPiHFZkc6LoPFF6K7azeP3KlWk= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1621173634563682.9764282185381; Sun, 16 May 2021 07:00:34 -0700 (PDT) Received: from localhost ([::1]:60844 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1liHJn-00017r-Nc for importer@patchew.org; Sun, 16 May 2021 10:00:31 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:38264) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1liCx6-00040y-Gw for qemu-devel@nongnu.org; Sun, 16 May 2021 05:20:48 -0400 Received: from mail-pj1-x102f.google.com ([2607:f8b0:4864:20::102f]:43817) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1liCx4-0006ZM-7K for qemu-devel@nongnu.org; Sun, 16 May 2021 05:20:48 -0400 Received: by mail-pj1-x102f.google.com with SMTP id ep16-20020a17090ae650b029015d00f578a8so2143098pjb.2 for ; Sun, 16 May 2021 02:20:43 -0700 (PDT) Received: from localhost.localdomain (ai126146207143.53.access-internet.ne.jp. [126.146.207.143]) by smtp.gmail.com with ESMTPSA id v2sm7330996pfm.134.2021.05.16.02.20.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 16 May 2021 02:20:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lithdew-net.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=lwFgkfiegTvUCCq9XMyB/9qIOAqIz3tB60NTjtV4nSE=; b=WFn5raH8XpoKvmwxyOnUkaG14LhE3uSmTFQN80GrR8tdSXHWZ4y1Dg4W2qDYMl2pnL IoFSl5+BWL27y4jMq/rg1gov4emMYC8dBBMab8ImFrw1Si2HlOT0ut4yMTeO90gqoXTU JQYkZWipJsU/mpKlu0NgEJsq7Oa4K0LVBVdUH1d4rUpZbw+rRY7fJ92ZV08rd/SM8/VR 0ra+7verOOhyuebMg+SLKd0yu3w2SNCvqqfIzsK52/O2pPV5JcKE40cAO8dnzGAe/bGP WMNJpmSOKTX0002xktXLC2G4LBe6Bdzmrdepu2CMcGUdXr4qTnRIIAbagdQPYzPxnP5s +djg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=lwFgkfiegTvUCCq9XMyB/9qIOAqIz3tB60NTjtV4nSE=; b=n6CVK7ZAcku6aHmYOMdix2PldL8AS55yftP9qy+L5oqvtCIMR+inBL73xvA8I08C6g SAxn7zT+wVI8gxbGk6tIao1+zHyF2F+tie+IKdO5UnhXmqU+y0FLvKX2NwoB2woevP75 bq7DXbiIxWepAcAO+JORx9HHLf9miBvVMIU4sqK/vOOESVZEKI0wRPA1KiLCozrjeXdd VbftkZs++gX8Nb/YUZE4mFt1b4oicwSY/JeZQv1rxuzT1lsmvor2U2KphWXwDTa6X9sR wNd8leihg/LNlTejxo4BK3pr4VikeGYGNYVr+qJ8/N23LUJyzXBCzY+ASii2DnakZwJc S/TQ== X-Gm-Message-State: AOAM533tX4nEgSj1+HjE03aKzH0cqsJkRyJQ5Z3LG6ZM7+XuIJ0hvICN uFK2MsD1WxB2KR42qap61fdNwPhP1gfxno1rSRA= X-Google-Smtp-Source: ABdhPJw9uJbMYHJuUPA8iNQLDUksXT4bOUWVAh+iARp/JqzQ7evM9XKIEkQ2XEYsJuuBRKxlmIRZdQ== X-Received: by 2002:a17:90a:5881:: with SMTP id j1mr34012911pji.122.1621156842362; Sun, 16 May 2021 02:20:42 -0700 (PDT) From: Kenta Iwasaki To: qemu-devel@nongnu.org Subject: [PATCH] linux-user/syscall: zero-init msghdr in do_sendrecvmsg_locked Date: Sun, 16 May 2021 18:15:36 +0900 Message-Id: <20210516091536.1042693-1-kenta@lithdew.net> X-Mailer: git-send-email 2.31.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=2607:f8b0:4864:20::102f; envelope-from=kenta@lithdew.net; helo=mail-pj1-x102f.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Sun, 16 May 2021 09:58:24 -0400 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: laurent@vivier.eu, Kenta Iwasaki Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @lithdew-net.20150623.gappssmtp.com) Content-Type: text/plain; charset="utf-8" The mixing of libc and kernel versions of the layout of the `msghdr` struct causes EMSGSIZE to be returned by sendmsg if the `msghdr` struct is not zero-initialized (such that padding bytes comprise of uninitialized memory). Other parts of the QEMU codebase appear to zero-initialize the `msghdr` struct to workaround these struct layout issues, except for do_sendrecvmsg_locked in linux-user/syscall.c. This patch zero-initializes the `msghdr` struct in do_sendrecvmsg_locked. Signed-off-by: Kenta Iwasaki --- linux-user/syscall.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 95d79ddc43..f60b7e04d5 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -3337,7 +3337,7 @@ static abi_long do_sendrecvmsg_locked(int fd, struct = target_msghdr *msgp, int flags, int send) { abi_long ret, len; - struct msghdr msg; + struct msghdr msg =3D { 0 }; abi_ulong count; struct iovec *vec; abi_ulong target_vec; --=20 2.31.0