From owner-freebsd-security@freebsd.org Tue Apr 6 08:39:52 2021 Return-Path: Delivered-To: freebsd-security@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 1D4195C4CD5 for ; Tue, 6 Apr 2021 08:39:52 +0000 (UTC) (envelope-from grarpamp@gmail.com) Received: from mail-ed1-x532.google.com (mail-ed1-x532.google.com [IPv6:2a00:1450:4864:20::532]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FF1DR2kQwz3lQx for ; Tue, 6 Apr 2021 08:39:51 +0000 (UTC) (envelope-from grarpamp@gmail.com) Received: by mail-ed1-x532.google.com with SMTP id o19so15535603edc.3 for ; Tue, 06 Apr 2021 01:39:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=Ubv6ONoVi6YkVpU11qFmDJExclLW1AtiKQp3pcgdiQU=; b=ezyfKF1vQo7HqPvF2MpAyvMg0r8wi6iGXCDSE/QP/GYm/NGD9cut+EQMXfA4e9Wd1/ 2HCPAvsLtvriJeDB/W2Efyrlw2qcyajWDjIaZxF6Yn3oquszgQFaGMFRsdWApOxnc9ds fF2s717YKBXvBgt/KweuFECXivJH6BeOV9Hfqn6f+bh9Enq87oj/NXbwit5ZWGjNxUnb pbZSzWpoSve4QqPvN0MZlj1JpYg9+9vyLyzZHA6wC3ZsLCo1PFW5DlGiXyZClmEaMNiG VG1fj9ZcQfrXUatR8RPNFMRlksFq2/JebwWxTk9fGKTlhPOIQn22GPtS0hZTMHnIfcJj wUDg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=Ubv6ONoVi6YkVpU11qFmDJExclLW1AtiKQp3pcgdiQU=; b=ER+9B0gREUQSYIl5U1uxuNMbMz9sgM0H3o0LbtTOV4xN+h9O74Ejzef3nBUVFSA17X reJSnztOUv4DeoMPt8p9rHDJ46Fb5kFdqfHTKxf8mQFNbI0mP5fhnj70ino9N5C/7yyg rCdmpDWhIlTBwKewnvFkGGoQUJSYl8Bub7QcBRyx2UFRCi8Us4c+rkFWNi64en+DdCYv nDRTs3vFvQgMIHKS5lCTKWubRyst+M2oO+3l+jIXxAeJbBSxsblOhG/bbAV6lugQT3Fx 0a41sCc57+v6Y1CNCxaibC1ul+/viM/2mwuBRrtJBbfPHRhTRnslFcVbLjLcbDvJ9qkC Cy8g== X-Gm-Message-State: AOAM532shUPB7G17MPKTzkVfb/aWyOD6rxVCcvuT3aI+VL1maCZg4jP4 2zdX/NI097pTx8npqz4brpOUpeuxyncmookI66ynFqHA8MpuSA== X-Google-Smtp-Source: ABdhPJwaq5kaTU7sCLKONIcFkSrCY0hPrJEWRKLa13Z3OTUv4u/zY0B+2U0NCcHwFVqXYU83gvxUWUJAaz/4AyiQn/A= X-Received: by 2002:aa7:c4cc:: with SMTP id p12mr35620271edr.325.1617698389652; Tue, 06 Apr 2021 01:39:49 -0700 (PDT) MIME-Version: 1.0 Received: by 2002:ab4:8fc9:0:0:0:0:0 with HTTP; Tue, 6 Apr 2021 01:39:49 -0700 (PDT) From: grarpamp Date: Tue, 6 Apr 2021 04:39:49 -0400 Message-ID: Subject: AMD: Predictive Store Forwarding PSF To: freebsd-security@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 4FF1DR2kQwz3lQx X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=ezyfKF1v; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of grarpamp@gmail.com designates 2a00:1450:4864:20::532 as permitted sender) smtp.mailfrom=grarpamp@gmail.com X-Spamd-Result: default: False [-4.00 / 15.00]; FREEMAIL_FROM(0.00)[gmail.com]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; TO_DN_NONE(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RBL_DBL_DONT_QUERY_IPS(0.00)[2a00:1450:4864:20::532:from]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-security@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; SPAMHAUS_ZRD(0.00)[2a00:1450:4864:20::532:from:127.0.2.255]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::532:from]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[freebsd-security] X-BeenThere: freebsd-security@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: "Security issues \[members-only posting\]" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 06 Apr 2021 08:39:52 -0000 Shouldn't this get a kernel option, sysctl, test app...? https://www.amd.com/system/files/documents/security-analysis-predictive-store-forwarding.pdf AMD advised customers last week to disable a new performance feature if they plan to use CPUs for sensitive operations, as this feature is vulnerable to Spectre-like side-channel attacks. Called Predictive Store Forwarding (PSF), this feature was added to AMD CPUs part of the company's Zen 3 core architecture.