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 3DC18CD3424 for ; Fri, 1 May 2026 16:48:43 +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=3JVgPi8y5pr9WU/dl+aDm2nZ18TubPQulEy77eIIoew=; b=4uJbL4jxvBJO0hqKQKSsUpE7kK FJ3nh4LuKJWx+ferNRXk0CDsqHk7uKgqj6mowHsnRNXv32JXVHdQ9+OPVdKAvE0cRFHr4FzVmRBC7 njYtm3SG9f6eZhKYZdcVrPIuQnb5M/rQxproOJFYKp/9DSt1WGivc5f9dzn1QNOwUSM60rJvsWi8j SdkbisI//M5/OJ8qgv0qLnMF4aBr5Qt9cAaTbuVgUHJhGWJc8xfnFPg0wEceAenn4t6+hc0Srmp3C CSg6MK6qSUNv4lEZ13QVNdDDYftW55k9+rL3xElDjswFt6Ee4IiWHtPCWEb/207ymHgHmEOFAuaii CgdgXLSg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wIr2e-00000007RDu-0CsE; Fri, 01 May 2026 16:48:40 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wIr2b-00000007RAQ-1OWj for linux-arm-kernel@lists.infradead.org; Fri, 01 May 2026 16:48:39 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 7240F176A; Fri, 1 May 2026 09:48:31 -0700 (PDT) Received: from gaia.lan (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 5F49F3FB3E; Fri, 1 May 2026 09:48:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1777654116; bh=0mhe5VO6bibA7BOMRyysUlyXRYgOpwf38PrIb8CTsm0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cOyG47tYx2GM+V815gcxteslVYvLCr/JT7YyNNg9OXp8pk8PfZ6816/nXtBk6i61O 03DNgK6VCRnQhXeO3jpN99bDGHeGw6krvxSPMbHG6doMc9rYTk7R2nXDCdf1tRNpvI 3w+rwseFvJS7G2ypiaSJaivkB1YzcHNpkHP41vO8= From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org, Kevin Brodsky Cc: Andrew Morton , "David Hildenbrand (Arm)" , Joey Gouly , Mark Brown , Shuah Khan , Will Deacon , linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: (subset) [PATCH v2 0/5] POE sigreturn fix and extra tests Date: Fri, 1 May 2026 17:48:24 +0100 Message-ID: <177765401795.1247142.18437523935136255541.b4-ty@arm.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260427-poe_signal-v2-0-2bd9d6f16ab4@arm.com> References: <20260427-poe_signal-v2-0-2bd9d6f16ab4@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260501_094837_440445_C4879387 X-CRM114-Status: GOOD ( 10.09 ) 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 Mon, 27 Apr 2026 13:03:32 +0100, Kevin Brodsky wrote: > Commit 2e8a1acea859 ("arm64: signal: Improve POR_EL0 handling to > avoid uaccess failures") introduced special handling for EL0 registers > that impact uaccess. This did not however handle the case where a signal > handler removes the relevant record (poe_context for POE) from the > signal frame; this is clearly not typical behaviour but it is legal. > That commit resulted in arbitrary data from the kernel stack being > written to POR_EL0 in that case. > > [...] Applied to arm64 (for-next/fixes), thanks! [1/5] arm64: signal: Preserve POR_EL0 if poe_context is missing https://git.kernel.org/arm64/c/030e8a40fff6 Will, if any objections, please shout. -- Catalin