From patchwork Fri Mar 15 03:26:11 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 160391 Delivered-To: patch@linaro.org Received: by 2002:a02:5cc1:0:0:0:0:0 with SMTP id w62csp16277159jad; Thu, 14 Mar 2019 20:56:19 -0700 (PDT) X-Google-Smtp-Source: APXvYqyL3ErokM/6LzHGxjp+3y4tghb6V2cyRVFe7MJ7NG7ZtOQZdZRYMywheEbeE9Qwo7NU1bxG X-Received: by 2002:adf:f611:: with SMTP id t17mr743481wrp.248.1552622179153; Thu, 14 Mar 2019 20:56:19 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1552622179; cv=none; d=google.com; s=arc-20160816; b=qu0WDLD868jewP2z6+rnQRiBAbAl02pcaCSsFRyOswZdXwXJizpBoCdHrl+RG6RLuv OtCKFcfgIjbF7qF2zaTyf2k8WqgTbkML5kwpdKiQocHcCL+Pjj30v3wEn2zgranSTKLj Aq/xT1WQF7N6g3sSRjHWnuvjLT9Yq8YYPLsPH1XDKN6hQ4b5OQBQnnkNpEJR3RZgbHnT ZQ+VHq6LgDkg/QygwDuvWvzHVPsaC5/MbSvS+iVRGvm6rJEmRfK653NJeKgvZIEHAIt+ i3FOFUvNDgYHWX0xKt4Y2QfFRVqK2q9aX/qau4vD/sNGmhJCNhP8HOQe1w0nTWcMkP4Z SA6A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to: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=nEGE+N+ZBpl/kqs4WAZ53DlvFSXg6yplX5rQG8WIa8g=; b=xHbB7NtxhDx/ZjPb0LNpFx3EOdktSJVfdjXPa2KEg979N70+eTWdgw/VCN8eNf4WQw 9yVI7PeBMFOeLxXAmTTWJMbERLL+QV8mvzbWCTL4cVHg0bsZ+PDIkcDnlsJxlbIrbcAn SGjMq7DqfWQ9ZjgPiEAoKRUPRZpCS4XSoHJzAdC0Vf5PRC2zAx0M8d9LdbTXMGEIAzi7 qS4RwA+PavZoNSGxvCdyc6+jT0x6kBug3uP2OpZwVqmlTfbGrfpPks9+RdRc8QZrmhPT RIotYS6Jsn+/0vSQFR8i2SsO2VCLsUIz2sUlmu1b9m2gFuI8tzbcHpRM54q3N+Ib0Mh0 Gd2Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@linaro.org header.s=google header.b=tyz6mo5r; 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 c20si509232wre.66.2019.03.14.20.56.18 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 14 Mar 2019 20:56:19 -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=tyz6mo5r; 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]:49166 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h4dxC-0005sw-5N for patch@linaro.org; Thu, 14 Mar 2019 23:56:18 -0400 Received: from eggs.gnu.org ([209.51.188.92]:43718) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1h4dcL-00057Y-Lc for qemu-devel@nongnu.org; Thu, 14 Mar 2019 23:34:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1h4dUV-0002mz-KL for qemu-devel@nongnu.org; Thu, 14 Mar 2019 23:26:40 -0400 Received: from mail-pf1-x42f.google.com ([2607:f8b0:4864:20::42f]:40501) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1h4dUV-0002m8-Cw for qemu-devel@nongnu.org; Thu, 14 Mar 2019 23:26:39 -0400 Received: by mail-pf1-x42f.google.com with SMTP id y124so5272023pfy.7 for ; Thu, 14 Mar 2019 20:26:39 -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=nEGE+N+ZBpl/kqs4WAZ53DlvFSXg6yplX5rQG8WIa8g=; b=tyz6mo5r2GW/GkviZZ/ISu8xBeD5QX3lwToVJ8/ClL614QMHjRvASeK1FAVKzHkaou uQsxAQCaqElWSkxk5RTqB12WLUB/NBhaoxBFnPZNbhX/7m3Zi5IOZKamml0bsI0SgoDg 0m887ahw6hG5I9NmiqWZfXMfluzSOfy0EkNz4oHzpOgoEa44SxssvlY7UqpAhYk7piMe TOdIeqg7c0cqInIhUlOltLpqKHt0B8XRK3u1wH5ywk72awPuVhsJhM11YV9zzibJTdlZ kHj53ZrZNUuJrwOcEoY7nW9ePH8GKz4EEpz4OJvEDXugTzs219g++dcoGbnud6fKEKLY wfUA== 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=nEGE+N+ZBpl/kqs4WAZ53DlvFSXg6yplX5rQG8WIa8g=; b=EuJgziMllCvyXpl/hRuusRXUb6zBceuwQcr6IAG5oFfMUPW25Qq6IFv+4KOlVSLol9 YPjuecFbRX4Txobf33Zhg6dqMbTNNJEPoU9pMVm6Iw3QFDwcivOetloko5tEDlbhbpEW RRZ1lqq/4Gtlx+2IYi7gKrKEOBA1jwUhPqiHnz1yybVtcooyTxO0V74m5dR+bLtuAuVf 1bFLNow6aifqN1VtAPx8Hhhmh9SS22w5ZTsFVoR6g353BQQedjIDLZ4cT4GF+jc5BWfl ZLxRrY9JlZ3WzVRTWyiPzEOspptCKeUThiZhI+lx6dvc22kFp0PnXN1LDe0i5TxYcQf3 3gbQ== X-Gm-Message-State: APjAAAXjvGBwCc5iBqBfiLeWT/gMH1N9qbjrXh8b27y/woUmKA6z6KiW WXa2qgRSVWGtzjYcfCKMlUSTmJJaPCM= X-Received: by 2002:a17:902:9a43:: with SMTP id x3mr1782791plv.173.1552620398042; Thu, 14 Mar 2019 20:26:38 -0700 (PDT) Received: from cloudburst.twiddle.net (97-113-188-82.tukw.qwest.net. [97.113.188.82]) by smtp.gmail.com with ESMTPSA id d26sm690816pfn.86.2019.03.14.20.26.36 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 14 Mar 2019 20:26:37 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Thu, 14 Mar 2019 20:26:11 -0700 Message-Id: <20190315032629.21234-6-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20190315032629.21234-1-richard.henderson@linaro.org> References: <20190315032629.21234-1-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::42f Subject: [Qemu-devel] [PATCH v3 05/23] 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: , Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" Prefer it to direct use of /dev/urandom. Cc: Daniel P. Berrangé Signed-off-by: Richard Henderson --- v3: If getrandom is not present, fall back on /dev/(u)random. --- crypto/random-platform.c | 37 ++++++++++++++++++++++++++++++++----- configure | 18 +++++++++++++++++- 2 files changed, 49 insertions(+), 6 deletions(-) -- 2.17.2 Reviewed-by: Daniel P. Berrangé 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 2c95e6ddc9..2b79c2fad8 100755 --- a/configure +++ b/configure @@ -5781,6 +5781,20 @@ if compile_prog "" "" ; then have_utmpx=yes fi +########################################## +# check for getrandom() + +have_getrandom=no +cat > $TMPC << EOF +#include +int main(void) { + return getrandom(0, 0, GRND_NONBLOCK); +} +EOF +if compile_prog "" "" ; then + have_getrandom=yes +fi + ########################################## # checks for sanitizers @@ -7163,7 +7177,9 @@ fi if test "$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