From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9A3E41F5834 for ; Sat, 13 Jun 2026 00:20:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781310041; cv=none; b=YoPMmO6LKOKMvFiUYb6tnYPGfrPs1mzjeg8mLfDr5qwCibmv3IRnoXdZcQbILih6bNLtpuPL9Pkb9zS/6CBoCVNIEtXUEGr6eZi/QbAOFidHiequN93yNvIxEsg6tbqd7lxSJFbEXRxfmH6N1nQ9U7jrX/iJgyb48uvbzaeWCHo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781310041; c=relaxed/simple; bh=BGbTT4pl8yUU48pWeQdBQ3HUUQ+YTavKqvYo/o9BJDo=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=MgHVYAyQm8mnvqeaJzX/vwyhnOZFhxsaTC1AUt6Y+Xjysp6EzXiWJUmu0WiLd+3Sx9VpX8bSOf5iT7wqteOvBzV30syusyTJzTr1tGGegatsS4IZDF+EPuSlcBPiBHB27XLOAaEtm4APTsQWWIP0XlVYsUY5BSidXpxkmsp3hT4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=NJJPLQH0; arc=none smtp.client-ip=209.85.216.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="NJJPLQH0" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-36b7f696b40so1211355a91.1 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=vger.kernel.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=NJJPLQH0mCM+Rz9zv7YLrjWr4O3wvAFrQANctPo0W7S3pzQ6GLTJDAT/xVBCVWHLnP lKopncWq7GTRR5Pswia5vRrLqz9owtb64vswlr9zH/J9g8AmMns7VcE6ZYM4Ih1TTxJs P2hBASgd0qza9e1dzdOmd8mFaKSqMXpQCUgPxbzPUIBMgLIUb4p8vteYrkoo/fv+844K OVFIGXET8Wnyb/Vomh6r3RvPsCb7NBM6hrLkMftp4noNR30p/LNC/br2q4QSkhZvd4lb 3V9a26iAmxbEDahd0Y/WvPfKbubbbVGH1mm6TyJDTZsu/N79oH4rGpz7E4K07d3L7OtG 4e0g== 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=oA1UM/jmGpokcm2QaxrhI0JyRBcsg7bEDmY4O+avX/LY3u2OqlaBUR5utVwQZ0Fa1q IjoCulBrTnxgqDd/c5YZA9KHvGiN+KHKj4YqGo+2rGKw2weNqdQuDLPkaAza4i84/GSW REv68gz+t5DWUhFlXp1eEpv91nTsx31uSU1QPswT89zGs3TKxBiPmbzCoOPLHpwdIzTJ O/8SB9QxodVSLP4hkki9jyXXi3iT+4SytUn60K/CgZ0otQVqdaYTLoHiU3N7ixkLGco3 eeK5eWITVp2vUrVcSP73ZypRww+j9y3KxCMvpTblEKNbRGlm+nzRnyQ1388+gZoexPLU Vygg== X-Forwarded-Encrypted: i=1; AFNElJ/eGcgBIQrbPLwfTfM1EhDPxVefCPLkB/nzf8gf2D3sqr8xDGcvlvWfKM7sFL8z5SFT1zcP/7jlYBLxCh4=@vger.kernel.org X-Gm-Message-State: AOJu0Yw+iWlhLtzcQR1JL3NbKVrfTtBtO0/7Xahm29TsApzAycqmlkKo TOLQIAuP8WOG4tP3Fo6aLrVvjb5QocJ23oLY3NkTm3ErTfjKew3xzFj/+K3AYUtOGmUtGFbOPIj 7woCMJg== 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) Reply-To: Sean Christopherson Date: Fri, 12 Jun 2026 17:20:16 -0700 In-Reply-To: <20260613002031.745413-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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" 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