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 1ACA6CF5396 for ; Wed, 23 Oct 2024 14:35:49 +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: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=zNbs7lMxJe0WpEfzvkFkz7bKbVbhuIqCKdgJ6nIjpBo=; b=mLdruLzgHZijH/UuI3x4Y/SKEH sIdxQYQvW+dy81Z1i/3MdiJKfO6QD0JJamPUw3V3iFakMrxph0VxFF4S1cwV67vkcP2zB8c8fsrtM j8ZOMnkHc8z2H5os47DKfI2TbPD/t2VNOBy1l4dD03N1XVNk8CX1fIs50fAS0h/2LvT6yh4HeWQ/5 zGsEB9jQJG9UX9LyKNG/CR74JIHaY5Qexg3L5HQlKWNwX2fi2lkABuRoEGkefb1fPRd7xmMvJiVqT vyMXiPk1SXOid0cPSF1+JWdPk66XF5ZXbtEa87wEdMobAcXWoL/sUzS1vaszOr4KFfS1ohewwOaOj NZ6ofyqA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t3cSW-0000000Ek4o-4BQQ; Wed, 23 Oct 2024 14:35:37 +0000 Received: from nyc.source.kernel.org ([2604:1380:45d1:ec00::3]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t3cPR-0000000EiND-0mJn for linux-arm-kernel@lists.infradead.org; Wed, 23 Oct 2024 14:32:27 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 292C6A44F62; Wed, 23 Oct 2024 14:32:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id ED3D3C4CEC6; Wed, 23 Oct 2024 14:32:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729693944; bh=ps2pio6F3j0r+hhv1BZ70KY2snpn9xRXWVZg2U276Hw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=J81qSgJFpjyeoc3DxQxBaFqXCkgX1c4Xnj6oaUPijsX5rIj8FTS6q9TnRIXOeMTkT b+NyqCgXd8FDTY1mONqj891mJxVlDdX/XvsDrRlBBO9Nd3zWS6sK8jV6YLv57IrZuX 1ZPVhOrCa+IkVwWM5ocB+N8Vtdx/+96W7jMin90GRF7TSLeshHhD2KFonlebT01jJr JkIbO83Cobkxa2iqRhOA6mcVZHI0U1ENg97wRFcTfzjD9399mfXtsecEDhUHFV0M+7 Uiv63HJGzqUfw9pYLL+DrbSxpwJWHXiyirq4CZWD4ios92cAyDvm6ArWKVIUgPXZST HLk+su6TPbfNQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Joey Gouly , Will Deacon , Catalin Marinas , Kevin Brodsky , Sasha Levin , pcc@google.com, dawei.li@shingroup.cn, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 6.1 13/17] arm64: set POR_EL0 for kernel threads Date: Wed, 23 Oct 2024 10:31:52 -0400 Message-ID: <20241023143202.2981992-13-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241023143202.2981992-1-sashal@kernel.org> References: <20241023143202.2981992-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.114 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241023_073225_358409_6039D5B4 X-CRM114-Status: UNSURE ( 9.39 ) X-CRM114-Notice: Please train this message. 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 From: Joey Gouly [ Upstream commit e3e85271330b18f487ab3032ea9ca0601efeafaf ] Restrict kernel threads to only have RWX overlays for pkey 0. This matches what arch/x86 does, by defaulting to a restrictive PKRU. Signed-off-by: Joey Gouly Cc: Will Deacon Cc: Catalin Marinas Reviewed-by: Kevin Brodsky Link: https://lore.kernel.org/r/20241001133618.1547996-2-joey.gouly@arm.com Signed-off-by: Will Deacon Signed-off-by: Sasha Levin --- arch/arm64/kernel/process.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index 044a7d7f1f6ad..048fe09da8a07 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -399,6 +399,9 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args) p->thread.cpu_context.x19 = (unsigned long)args->fn; p->thread.cpu_context.x20 = (unsigned long)args->fn_arg; + + if (system_supports_poe()) + p->thread.por_el0 = POR_EL0_INIT; } p->thread.cpu_context.pc = (unsigned long)ret_from_fork; p->thread.cpu_context.sp = (unsigned long)childregs; -- 2.43.0