From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 7918339A04A for ; Tue, 5 May 2026 16:07:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777997236; cv=none; b=jbGTkMJVsJniSsCozs7u4ULlQUxlsEKB86ph9aHmbJEZq1hLXrwDO+pnxa7yezfHcjAdT9akxWZFju4msUTYUBwzym2BqK2PAHhSX/RjXHTwbYT8g/JFhQyRJARPJ8KYuulLmd5uUFkipEjbG50lVqmJe2gfPhuNzL1pzujnEEE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777997236; c=relaxed/simple; bh=+OGpwgzVEkFFPsMOgL6J2ZFY9bOrw4hijWLmgpJn7uk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Pt++gzucRRLQHd9eyY0gbm9ovO6xjjmSGyYxlKm9RQRCRUccP0vGI5egu9OmzXuoeHDt+xd2/idh5LQGPsAfKD4F3GziSW1gs57lQIQ8B5DWusKhGLZ/5qCVNmgEkbS1kiXHiQDs6TqDWboinTVPfkx7e5HAbz4PRunO6rZ0hno= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=Eo9DDHmg; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="Eo9DDHmg" 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 8764A14BF; Tue, 5 May 2026 09:07:08 -0700 (PDT) Received: from localhost.localdomain (e123572-lin.cambridge.arm.com [10.1.194.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C0D1D3F763; Tue, 5 May 2026 09:07:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1777997233; bh=+OGpwgzVEkFFPsMOgL6J2ZFY9bOrw4hijWLmgpJn7uk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Eo9DDHmg2QBzvLuzevofzQsstenbooOdc4Gqg47lWWeDfoebr41BuG04YHG89O/io NaJ2FYF40DTRNat24YBclNyTeQWc6si99SI9TS3W5M0ijJ8UOdg7W+fxprrdZUTjFy fo6B/KZ5vD2hAp2k1FAlzS8ZKdW67Z0a1fxCNUes= From: Kevin Brodsky Date: Tue, 05 May 2026 17:05:51 +0100 Subject: [PATCH RFC v7 02/24] set_memory: Introduce set_memory_pkey() stub Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260505-kpkeys-v7-2-20c0bdd97197@arm.com> References: <20260505-kpkeys-v7-0-20c0bdd97197@arm.com> In-Reply-To: <20260505-kpkeys-v7-0-20c0bdd97197@arm.com> To: linux-hardening@vger.kernel.org Cc: Kevin Brodsky , Andrew Morton , Andy Lutomirski , Catalin Marinas , Dave Hansen , "David Hildenbrand (Arm)" , Ira Weiny , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , Quentin Perret , Rick Edgecombe , Ryan Roberts , Will Deacon , Yang Shi , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org, Lorenzo Stoakes , Thomas Gleixner , Vlastimil Babka X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1777997220; l=917; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=+OGpwgzVEkFFPsMOgL6J2ZFY9bOrw4hijWLmgpJn7uk=; b=RlPHbUkc3oheG0ykOqKEOO0iIZrzIk4Arn9cjSnWXUBSSdJ8m6tPQJFPGDMPFbGVuo8Rinbti dTlSp8DlZ+lCl1fLdMdgguzhz9WrDCYuKFAxaqScfhVPCEzDVnEUOK8 X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= Introduce a new function, set_memory_pkey(), which sets the protection key (pkey) of pages in the specified linear mapping range. Architectures implementing kernel pkeys (kpkeys) must provide a suitable implementation; an empty stub is added as fallback. Signed-off-by: Kevin Brodsky --- include/linux/set_memory.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/include/linux/set_memory.h b/include/linux/set_memory.h index 3030d9245f5a..7b3a8bfde3c6 100644 --- a/include/linux/set_memory.h +++ b/include/linux/set_memory.h @@ -84,4 +84,11 @@ static inline int set_memory_decrypted(unsigned long addr, int numpages) } #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ +#ifndef CONFIG_ARCH_HAS_KPKEYS +static inline int set_memory_pkey(unsigned long addr, int numpages, int pkey) +{ + return 0; +} +#endif + #endif /* _LINUX_SET_MEMORY_H_ */ -- 2.51.2