From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (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 C4FAF3C1978 for ; Fri, 26 Jun 2026 21:35:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782509745; cv=none; b=Cf2Yuljgyq4zLPbDVumiB8Hg+SPQ+sypQih8awuT0ZsjHMeHgpE8G+MUcGHfz/PQZouUiOBLt6Rowl5k+/ESTX1lRyhVPZE+erpEr7fCiqfIUvGWwTTq1Lfq5lL5nKkkiCZZRGQfMUgmPwDeiUw19QmFWxtPHqQhedda1h4HEd8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782509745; c=relaxed/simple; bh=b+6vXwlbFetE4gcCaUQZiIdwXOPNKHYqQd9n96GIV8k=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=cvfYJ7YM5ThE8mP851QldICVtV8vfZuJsCqaWm3GgIU7vT17nRJyScqgs2cO6ooI7gPQfafi4e3CYIQd0mPJJKN2rS4Ibm0hnxh5ZPBUdsXPyXsmNCvtexuPAk8loXQJfQMqG5UIOrJjImn8haA0E7/42Nx4/V71nlBDT8GO3yE= 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=EvECgyVm; arc=none smtp.client-ip=209.85.216.74 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="EvECgyVm" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-37df0ae3ca8so869334a91.3 for ; Fri, 26 Jun 2026 14:35:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1782509743; x=1783114543; 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=qCGL317mUr/viDiHdvHr/Nh+V34QOpSJDtpLpPCiKc0=; b=EvECgyVmooT0my2m+AhG5bg5iJ/w3tp404DJaAGIP2meoZjVwKtyO4nWwJbGR9Xcaz nVHA25J3MCYQvDZpxlQA9DPGQ2GVCIGrGDyXlAprNHvD3mgxpt24Ta6vmwZkbTMNHxk7 87w6cvKWkQDJj/m5VuFlKqwB91xDgBaZpgZ3Y4LM/8sAobSwpZIk4Csk3E9QHl59eTx2 0A8adFeMQ+3Tivz6G22o5/UtwhQWmoYo9U2+bYhs6lkqyJwAS4tkh5LCHFbZn9wXCOkL xWFNUjvBxCDYv6qhQXnljAQjNMWAJBIi6Au78tuF6PtQN5nZ30yD1ZJ5LbkExc7HW7pF 6jnQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782509743; x=1783114543; 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=qCGL317mUr/viDiHdvHr/Nh+V34QOpSJDtpLpPCiKc0=; b=msChmMN6N4GASbA3Bnu82VZq4O4rnJImuPDF3doSiOaJemcvdKRHAtb0aIBnONALvQ inNLoigwPYuvCVK2c+q5EDh40gdUp7RFXgA5qLcb3i/4fscESgNIIZ3C4rtMAieR8hFR IPgTP5J3LxcMggkPbGSX/YAOLIw9h0JpeY0H4GEBM5EMvETzmRvyz1dOCQ+CDp4E+Ywr Rs2Nkmj0wt9HKP8foqYy3BuaP1aiWX1AO8NIxwq/lH1IUCSuXrS1q9hys0AZRLhp1WX/ pLFA5QKOTR5m9C7OxGOIZjOrAMY92DelGCZ2IrIRbbbcDXNxY51qDjn5k548a2DxwKXj 3bew== X-Forwarded-Encrypted: i=1; AHgh+RotFC2Pxxh5nxRO7yIvfgDMIpn9YO1tIwOQSYSI0T5JDJUimbBVhh+AaFE6lXLLqvDcClPc7E43MLKZXcM=@vger.kernel.org X-Gm-Message-State: AOJu0YxY/tXcD6fdW/iTWIEPz9v07IIzNTh9DepPPcSjVNWJCUVtEiha PT8/SrVgioSc8MRghZKJ0ih5hrcpxrQziEmoasqJwOpe1/jN4hXACqaYpQLrb+f2gY4CAbHtDWG GGp/fDQ== X-Received: from plbv21.prod.google.com ([2002:a17:903:44d5:b0:2c7:f68a:7995]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:ce87:b0:2c0:3400:5c34 with SMTP id d9443c01a7336-2c7fc75a558mr80368325ad.3.1782509742779; Fri, 26 Jun 2026 14:35:42 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 26 Jun 2026 14:35:18 -0700 In-Reply-To: <20260626213534.3866178-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260626213534.3866178-1-seanjc@google.com> X-Mailer: git-send-email 2.55.0.rc0.799.gd6f94ed593-goog Message-ID: <20260626213534.3866178-6-seanjc@google.com> Subject: [PATCH v8 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 | 2 ++ 1 file changed, 2 insertions(+) diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 1016865d3f7a..277166ab1aa9 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include @@ -2284,6 +2285,7 @@ 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(); -- 2.55.0.rc0.799.gd6f94ed593-goog