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 20E24CA5FD2 for ; Thu, 1 Oct 2026 15:51:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc: To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=YmJNy3oFWhIRZFtfF6YAIvJtvccvbrXx+2twIX2a7lc=; b=YmfVjbhMzWjF32kiLt69H8Vnew mt8oEyyy+XocU5V+V5Gx3sTdb3/wDxC4I4uBulkBeYnf3/nZSRktiws++Yt1vT2D23sL7fFk2PHNw kV9FXhxTucW7DYuNw9SlmPKyIpd0ZTrpLLrdLdPLDGjAe0+Fysl5R94Bh48jJaJLEAx6h/8HBhrye R0p4CwpACUvXJTES0UvwLki+t1nbmO90atyqu+vFcYNiYFXoQ5Ys5Xb3WUrnizJWUznToZBdRMf2z CqOy7k3jabpIBAnEPdi67Kax9aTItOEHiGFgSyBS+I3NRMgJVdsYfHEysiNQ1vUjtSTP69EKoguy0 8LTVg9Eg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xCJ3h-00000009aZS-2pHr; Thu, 01 Oct 2026 15:50:57 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xCJ3e-00000009aXt-3uSb for linux-arm-kernel@lists.infradead.org; Thu, 01 Oct 2026 15:50:55 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 6296360A6D; Thu, 1 Oct 2026 15:50:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8AF1C1F00898; Thu, 1 Oct 2026 15:50:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790869854; bh=YmJNy3oFWhIRZFtfF6YAIvJtvccvbrXx+2twIX2a7lc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=mi3RXaYSY4tqfSNdPxdE8W/s6uZpmmUa+wH8hCOiyWg0AmeysR2AIhiCxvV6WqI31 E7Cgvt2zChm+dZI8RPDXoszRx8WpjEA0/tw3K4QYl47KaVDSzm2XRVwSg3Cy8OAgLs ZlprY/QyzgZrOPS0P9HmsrOpPAlfQGZJ28Fj79GWMAWuLeIhJfs16cbmf/Ez3HwKBZ +R3qZ0bv/l1FvYzQ9QHO6yp/pjpL06FeTBzgXVBgBYLbx88bc6y8KNVAi4jdLCN4zm n39XixA+nKp0LF/CMkjbKoqbC1iLTNRsjRB7+Lc2P/V6qL06zmE+GgmuHMKQNpvrOs e28pMnkCDxT5A== From: Will Deacon To: linux-arm-kernel@lists.infradead.org, Mark Rutland Cc: catalin.marinas@arm.com, kernel-team@android.com, Will Deacon , broonie@kernel.org, stable@vger.kernel.org Subject: Re: [PATCH] arm64/fpsimd: signal: Forbid non-streaming SVE payload on SME-only systems Date: Thu, 1 Oct 2026 16:50:43 +0100 Message-ID: <179086063838.2740899.986966739708665243.b4-ty@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261001130836.1410888-1-mark.rutland@arm.com> References: <20261001130836.1410888-1-mark.rutland@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 01 Oct 2026 14:08:36 +0100, Mark Rutland wrote: > When system_supports_sme() is true but system_supports_sve() is false, > restoring a specifically crafted SVE signal context can result in the > task erroneously having non-streaming SVE state. Subsequent attempts to > manipulate the task's FPSIMD/SVE/SME state can result in a variety of > problems, including fatal EL1 UNDEFs. > > In such configurations, the kernel always creates an SVE signal context > when delivering a signal, and this can only be in one of two states: > > [...] Applied to arm64 (for-next/fixes), thanks! [1/1] arm64/fpsimd: signal: Forbid non-streaming SVE payload on SME-only systems https://git.kernel.org/arm64/c/e060d9069b49 Cheers, -- Will https://fixes.arm64.dev https://next.arm64.dev https://will.arm64.dev