From patchwork Fri May 17 02:39:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 164365 Delivered-To: patch@linaro.org Received: by 2002:a92:9e1a:0:0:0:0:0 with SMTP id q26csp1605520ili; Thu, 16 May 2019 19:48:50 -0700 (PDT) X-Google-Smtp-Source: APXvYqzVs/VzZTE/1vw/IIF1fjdMxxP8fawdZ863QG18o0NhGhg4O70nMG19B4f8Et6uZUoCETF1 X-Received: by 2002:aa7:c0d3:: with SMTP id j19mr23784809edp.179.1558061329932; Thu, 16 May 2019 19:48:49 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1558061329; cv=none; d=google.com; s=arc-20160816; b=Vn5Hwt62tofQzzMoAfMPs2FZKlLHy/7oTUrppmlhVuSGfuYAKcKql4MdqL9M+Tmkdy aXJYXpXZi7BDmdZHMWo8DNTrYN/wiKcBa5BWaR3e8Dw59fhJ0iFge3k0TjmOgly8PTWb c6tuLtapX99Y9kni3O1r1OEZQUe5KMLAbzwKz1S0nGAvuOPiE79udN2bBivrVZpL74my vPrskn9H3aSFfVC59jwQo1QeVQIF5uomrUMuqsryr6b+SF2CpQpO+N27DFucvD7zrLE0 9IDBay99tytWLVWgQ6kwtsThp2JT17jSOKVplToe+TOWcp3sdDweNWc5L0qwi0Nu1QTS 64Cg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:cc:list-subscribe:list-help:list-post:list-archive :list-unsubscribe:list-id:precedence:subject :content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:to:from:dkim-signature; bh=5b/CXXH1sN97+phvpOhnV9PZFWQssisrkaRTvx3pjYw=; b=zSn2vzjVL1Eu9tgGsiHQ+w/rpGkLvmodLgbn174HpuIuH4QXvwpxvAj/QhQ+wSvqBI unkQGKgKvMa4H0H0MYTGSODTUT9Ebno4IL/XRifTEg/OYt+VVCn4CHdJ0l8N62PW9dw7 XN+knu1MiYFRJhKw+NqWUiCFMpiw0Z04eegKF1nQcqAlW88jt8mZhmUYsUeInwWYX0QT IEMdTprZwos9KoGo/mnADIzKbFqtdHrz+p3gvMxnX64B9cRSEI4ckvexmp2Q1yZ1oxtF mRL6AY31/8XN5DTUDAp7MQf4QWUE4DW4dDDYKEEeCnpFBv1Lv93xHC04y23tLZtU9v1Z 18vQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@linaro.org header.s=google header.b=GeOn+gf0; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org. [209.51.188.17]) by mx.google.com with ESMTPS id a4si1654685ejs.276.2019.05.16.19.48.49 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 16 May 2019 19:48:49 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@linaro.org header.s=google header.b=GeOn+gf0; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([127.0.0.1]:40210 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hRSvN-0004iy-2K for patch@linaro.org; Thu, 16 May 2019 22:48:48 -0400 Received: from eggs.gnu.org ([209.51.188.92]:39002) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hRSmX-0005Q7-24 for qemu-devel@nongnu.org; Thu, 16 May 2019 22:39:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hRSmV-00022z-ON for qemu-devel@nongnu.org; Thu, 16 May 2019 22:39:36 -0400 Received: from mail-pf1-x441.google.com ([2607:f8b0:4864:20::441]:34840) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hRSmV-00022F-IJ for qemu-devel@nongnu.org; Thu, 16 May 2019 22:39:35 -0400 Received: by mail-pf1-x441.google.com with SMTP id t87so2879746pfa.2 for ; Thu, 16 May 2019 19:39:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=5b/CXXH1sN97+phvpOhnV9PZFWQssisrkaRTvx3pjYw=; b=GeOn+gf0VHGLYFReV/OeK2f3Yr5lwwS2w1Flkz5OpjwMU3JW0B8MBMvbLL0KJUfVZn RbGFtTgawCJlXEnGjIT/n1e0+onCer4jrUCdVw4Fk6tXmTTik9H0KrRd1WZUdhTf07Ax pW0ch3iJ65Zxa7rUCWhgAZ2mw8O4fsL6BECKhjEUyWCRBcZsgMIvSipYyob8dCyYXiZK AoQuc4pnt9VhTqHNXJcgC7/BS0kOjiBk3BZlmu7eNCz56KCqRJ1s2wCISjQCoVCjINU2 hoqXniYG3s7G8zjV8Q+Ociw0vOH2NM4xYu/21/yArGuDOmUlWf89RgUiFEl1IZzXbkTa gxHg== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=5b/CXXH1sN97+phvpOhnV9PZFWQssisrkaRTvx3pjYw=; b=DR2Dc76rJEGlwLqhevscBEP+n0L/uY9wwBmH/zvj/YEhmtpFyAVoCzpbhLtsdXFsDv vRrtbcstyj16Q74BtFY1WW31ACEjAba6j2nhPnJ4Gh+SyxLDCpRmUzdFLRTR+NPGpF00 8hsp20KywdpQpFJUAFEBdkS3AjlNA6LrEaRY9wJojYbKzakwMDlilLzoIN0BBrk6yxEO XHOyA5DmhBK8aFPw+GsJMReGJiQNxGDPU4aZ/01v5u0q0PnWkSW8ojhB/Hl824IYN/ZR uinCY0QEMODUMetK7OmT2YfZ/+ZNkXMqMdjeql0wpT0FonOz/TuiaFuTv6fhODJl1ZvV vOjw== X-Gm-Message-State: APjAAAXqG/RdMayiygjrcPheEWGKx6FxZHPI3ejq1lKKsMVBGmVi5P6j PM3WYV2spM451Lg8YF4hQD5aPYVji3s= X-Received: by 2002:a63:1820:: with SMTP id y32mr53536458pgl.287.1558060774259; Thu, 16 May 2019 19:39:34 -0700 (PDT) Received: from localhost.localdomain (97-113-13-231.tukw.qwest.net. [97.113.13.231]) by smtp.gmail.com with ESMTPSA id w6sm6984152pge.30.2019.05.16.19.39.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 16 May 2019 19:39:33 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Thu, 16 May 2019 19:39:05 -0700 Message-Id: <20190517023924.1686-7-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190517023924.1686-1-richard.henderson@linaro.org> References: <20190517023924.1686-1-richard.henderson@linaro.org> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::441 Subject: [Qemu-devel] [PATCH v8 06/25] crypto: Use getrandom for qcrypto_random_bytes X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lvivier@redhat.com, berrange@redhat.com, armbru@redhat.com Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" Prefer it to direct use of /dev/urandom. Reviewed-by: Laurent Vivier Reviewed-by: Daniel P. Berrangé Signed-off-by: Richard Henderson --- crypto/random-platform.c | 37 ++++++++++++++++++++++++++++++++----- configure | 18 +++++++++++++++++- 2 files changed, 49 insertions(+), 6 deletions(-) -- 2.17.1 diff --git a/crypto/random-platform.c b/crypto/random-platform.c index 6df40744c7..cb3ca1bc09 100644 --- a/crypto/random-platform.c +++ b/crypto/random-platform.c @@ -27,7 +27,11 @@ #include static HCRYPTPROV hCryptProv; #else -static int fd; /* a file handle to either /dev/urandom or /dev/random */ +# ifdef CONFIG_GETRANDOM +# include +# endif +/* This is -1 for getrandom(), or a file handle for /dev/{u,}random. */ +static int fd; #endif int qcrypto_random_init(Error **errp) @@ -40,15 +44,20 @@ int qcrypto_random_init(Error **errp) return -1; } #else - /* TBD perhaps also add support for BSD getentropy / Linux - * getrandom syscalls directly */ +# ifdef CONFIG_GETRANDOM + if (getrandom(NULL, 0, 0) == 0) { + /* Use getrandom() */ + fd = -1; + return 0; + } + /* Fall through to /dev/urandom case. */ +# endif fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC); if (fd == -1 && errno == ENOENT) { fd = open("/dev/random", O_RDONLY | O_CLOEXEC); } - if (fd < 0) { - error_setg(errp, "No /dev/urandom or /dev/random found"); + error_setg_errno(errp, errno, "No /dev/urandom or /dev/random"); return -1; } #endif @@ -66,6 +75,24 @@ int qcrypto_random_bytes(uint8_t *buf G_GNUC_UNUSED, return -1; } #else +# ifdef CONFIG_GETRANDOM + if (likely(fd < 0)) { + while (1) { + ssize_t got = getrandom(buf, buflen, 0); + if (likely(got == buflen)) { + return 0; + } + if (got >= 0) { + buflen -= got; + buf += got; + } else if (errno != EINTR) { + error_setg_errno(errp, errno, "getrandom"); + return -1; + } + } + } + /* Fall through to /dev/urandom case. */ +# endif while (1) { ssize_t got = read(fd, buf, buflen); if (likely(got == buflen)) { diff --git a/configure b/configure index 03e71ef7b6..4e43bf766b 100755 --- a/configure +++ b/configure @@ -5815,6 +5815,20 @@ if compile_prog "" "" ; then have_utmpx=yes fi +########################################## +# check for getrandom() + +have_getrandom=no +cat > $TMPC << EOF +#include +int main(void) { + return getrandom(0, 0, GRND_NONBLOCK); +} +EOF +if compile_prog "" "" ; then + have_getrandom=yes +fi + ########################################## # checks for sanitizers @@ -7202,7 +7216,9 @@ fi if test "$have_utmpx" = "yes" ; then echo "HAVE_UTMPX=y" >> $config_host_mak fi - +if test "$have_getrandom" = "yes" ; then + echo "CONFIG_GETRANDOM=y" >> $config_host_mak +fi if test "$ivshmem" = "yes" ; then echo "CONFIG_IVSHMEM=y" >> $config_host_mak fi