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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2BAC9CD98DA for ; Sat, 13 Jun 2026 00:20:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Reply-To:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:Cc:To: From:Subject:Message-ID:References:Mime-Version:In-Reply-To:Date: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=5Gdhr42TK7HaiENwXEe169i/UA5JDaTAaZr1cyLBuko=; b=wNTGWyep/BquLRzp8IXb+jbe5l /9PEnl1XezwqltYSZpuvq+Z6y06BV7jCiw+UUQKnOH6Vjn0Rn1C14xGwOhq9baCN7eDnAoD8p7t9+ EaUImy5kim9TmwbDO6xwlH50QkvW/89rPlb2lYZTIuGFDTq7hOCnUGwiT4x6nimBj1YCo9HMqaTcG sFWaBZj9Vzaac3gwpE2FvO+QSuF7ucnEwLaxaI/QIETkyZ63kb0MKroavCxmgdAne7OsO7BdxUsDn tRSUBFr+NdXFYhi8QscvZKVu6P75zkJ4ygSnhN5efaNdLSBTlxHiqcM46DgTvtEKTxii1XhgtpPB5 k+nX/bZA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wYC7G-0000000BnfG-1BLa; Sat, 13 Jun 2026 00:20:50 +0000 Received: from mail-pj1-x1049.google.com ([2607:f8b0:4864:20::1049]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wYC76-0000000BnXU-35ew for linux-arm-kernel@lists.infradead.org; Sat, 13 Jun 2026 00:20:41 +0000 Received: by mail-pj1-x1049.google.com with SMTP id 98e67ed59e1d1-36bc380fbf9so1479566a91.3 for ; Fri, 12 Jun 2026 17:20:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1781310040; x=1781914840; darn=lists.infradead.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=5Gdhr42TK7HaiENwXEe169i/UA5JDaTAaZr1cyLBuko=; b=Qm3jJSMdd8EZ2GS/t+5sXq+ZHandPhlEDCm/3KA2ZVXs9lMMIyCVHCgppJvMHHlHLe yKuDqjzuS2OvR3eQ19k2lZawF8ELWB8C26wgM0jCwh0ez2au4RoJgm1cA7MQ+9wa9WBj tQzv6oDC4bfZzZhmW94J1aZHb2KfagUaNOzD8JWwHkdfDr3mcvhlJZpiFwdvCrEUynkH uA8YU8z5U65qQVOufGspkAR2UzFY4NBS0W7Mqgnb7taQowYiudGr2e6QrwTLIFSRhbl9 sE1NmI9AgGhEVs0bPaccaPj2AXFgdHARrZ18zB7k1DbKeykH9zDlV3qdUhJHXINXvNw4 wrEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781310040; x=1781914840; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=5Gdhr42TK7HaiENwXEe169i/UA5JDaTAaZr1cyLBuko=; b=grGqk7IhHC0imVR9Ik5CSkhutq/HGgYokk1RFNmKVU9CyXurtHL5tvV/jqsHImkKiv 8PJB1T3FLCczOkiXKMgreX6AqbqcEzztbvyBVcyMMAN4GSfiBIN82mIeDb3bUM+rLreU UHT+uo2gdy2vlZlRAFWmC3r+zDJrHkIK/oSNFETEOlDznsOmrG9kvkIIk5UFaVEwhUZC yK3ujJ08uDtyIgJl01Wuu2XY4xU01M1GOnPG1Q5l9aSt3m20FOhexsrdyyf/JwMO0Vj+ Kjb4wR8a6wDL18wVqg/9oPJokZg4iSdX2r7/BkGV/YyM95W3eFaOS3sk12orYdyZA+6I XWNw== X-Forwarded-Encrypted: i=1; AFNElJ9v7RgcGwA5EAz8qXUag5Gn3oJPneEDuor/PPvFO65LvBN11R9ZDLr6N0kXQgi8GYCZXZ299vYv7qP0dxYLHbyy@lists.infradead.org X-Gm-Message-State: AOJu0YwBknr0Jq1y2Oxj0ObHvOC9nl2JxeZbmD2YuMiDSE8xcrHZPoAt w/0QvWtmUEZ98wnMQGQECGztZNk75PVCUyqODZHxpWayh7iJZJbJnEI4WCeRlqkeY0aCgyGoUuB oluVkKg== X-Received: from pggg6.prod.google.com ([2002:a63:2006:0:b0:c82:798f:628b]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90a:dfd0:b0:369:2e00:1ff0 with SMTP id 98e67ed59e1d1-37a024176dbmr5248980a91.6.1781310039710; Fri, 12 Jun 2026 17:20:39 -0700 (PDT) Date: Fri, 12 Jun 2026 17:20:16 -0700 In-Reply-To: <20260613002031.745413-1-seanjc@google.com> Mime-Version: 1.0 References: <20260613002031.745413-1-seanjc@google.com> X-Mailer: git-send-email 2.54.0.1136.gdb2ca164c4-goog Message-ID: <20260613002031.745413-6-seanjc@google.com> Subject: [PATCH v7 05/20] KVM: selftests: Seed libc's RNG before using it to generate a seed for KVM's pRNG From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Sean Christopherson Cc: Joey Gouly , Steffen Eiden , Suzuki K Poulose , Zenghui Yu , kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, David Matlack , Josh Hilke Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260612_172040_775046_80339852 X-CRM114-Status: UNSURE ( 9.01 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Seed the RNG used by random() using the de facto standard method of srand(time(0)), so that a different seed is actually used in each test run. E.g. without seeding the RNG, literally every test on x86 will use 0x6b8b4567 to seed the KVM RNG. Signed-off-by: Sean Christopherson --- tools/testing/selftests/kvm/lib/kvm_util.c | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 1016865d3f7a..2e08d9fcefc7 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -2284,6 +2284,7 @@ void __attribute((constructor)) kvm_selftest_init(void) sigaction(SIGILL, &sig_sa, NULL); sigaction(SIGFPE, &sig_sa, NULL); + srandom(time(0)); kvm_seed_rng(random()); kvm_selftest_arch_init(); -- 2.54.0.1136.gdb2ca164c4-goog