From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5C4203B19A5; Wed, 27 May 2026 19:49:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779911360; cv=none; b=YiA//j5+frlx+PkBpRHfiUmOUJ5N4qBLu6For+1aMGj1K+i5TSZcvPwBguW4A0Gi/nshXQ804Zj8pkItWp9bupfxi6d1CH9CRCvJL+ZGLjmxYtdwDl9x022tl26ejr2eDzNJv+GKrOEAnyvX20y+a4W+RLGAyRq+te5OBF0GGkg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779911360; c=relaxed/simple; bh=dEfUBCnhpcGcpegy5jGGPYMMti3b3I7lOSAnZZhcrt0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oS6B8tOx3LChxt01WmXznnDMooeONkeQRAEtuElyYCKFhCmyLxPQONYEQyr+p67pNW0oITcFJ6ehPK9YwUYSznxaK/BLhup3WruqRPE7+q5ILfCBypvnuiLayIcIzfphoeDjS2sLQ48cfYAagrwPQZPTEm1RLZiE3Wf5axSs7tI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YprWyi+g; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="YprWyi+g" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BC8811F00ACA; Wed, 27 May 2026 19:49:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779911359; bh=dEfUBCnhpcGcpegy5jGGPYMMti3b3I7lOSAnZZhcrt0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=YprWyi+g6TSJZ8QMDgOFMPfvUDUVNKMiarMBf13KTtLtmBY05nUqS99e21pt8rI6R dFSFF3qRFZJUt0Kkcy+9rV5votVBrI7Xdd/WCAxVTIIKdqj6+y4xZ8qNjTbnsv9K+j hr52HEQDpm4vh5K1tpQhstGUBJhuK3dibNFhv4zd3JNZX2pRZODVS7DOrGKWgDDDe6 TA0nM3AMJk9WLgSfG1TWop/iTZAvpt4fjl5QEopEWvLrZ61jR1dc+pH/tWXCTYvq4V G0CJ09n0zvBs/FpQ968Nbfnm2wDB8Kon52COnifbqWe4NuFM+vXgcbz+YJo8TaLhHh kDSp1DGYryPCQ== From: Sasha Levin To: Thomas Gleixner , Ingo Molnar Cc: Sasha Levin , linux-kernel@vger.kernel.org, criu@lists.linux.dev, Borislav Petkov , Dave Hansen , x86@kernel.org, Andrei Vagin , "H. Peter Anvin" , "Chang S. Bae" , stable@vger.kernel.org Subject: Re: [PATCH 1/5] Revert "x86/fpu: Refine and simplify the magic number check during signal return" Date: Wed, 27 May 2026 15:48:58 -0400 Message-ID: <20260527-agent5-item004-x86fpu@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260526205047.3339490-2-avagin@google.com> References: <20260526205047.3339490-1-avagin@google.com> <20260526205047.3339490-2-avagin@google.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > This reverts commit dc8aa31a7ac2 ("x86/fpu: Refine and simplify the > magic number check during signal return"). > > The reverted commit broke applications that construct signal frames in > userspace (such as CRIU and gVisor) if the frame's xstate size is > smaller than the kernel's fpstate->user_size. Holding this off on the stable side until the revert (and the rest of the series) lands in mainline. Once it's upstream, please ping with the mainline SHAs and the list of trees you want it on, and I'll queue it. -- Thanks, Sasha