From nobody Sat Oct 4 15:59:08 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 13DF92D3A71; Fri, 15 Aug 2025 08:55:36 +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=1755248138; cv=none; b=ektqoGxBsYBESfKR1leyV7r9Sgez0jlFKhzaX8PmAO0quB9cdmXNSbuSUvxyyKvc6Ju9v5YgaHxTzQKf4OplsUyS9gE0hAAq3tIz11kyd7c6A/iWMs1hXvfi8bTvsax0Alw53z+yC5NKDWPnD5z/5ERbzy5HqNhbVqnTv3bF5V0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755248138; c=relaxed/simple; bh=4aDjkHibEaVadfQGPlSSmLSpJv3EcwnykRxixv3rl/8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HA7ZKfVwWSIZa1vc0LYwpNUEfY6a2pvB6JfjjJOx5sz9wo8qwqSLkzV11u7Hnk3RmY9fwxL7xJAVcZcH0pSc3Mda+TcYi14Sq8R80sgHz14ne/3nNYROVBrzwVigDSWX3kFS8jCwWUisteI9iJsNsi+VrFwgqod5xFqoMjI78KM= 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; 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 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 00C5E1688; Fri, 15 Aug 2025 01:55:28 -0700 (PDT) Received: from e123572-lin.arm.com (e123572-lin.cambridge.arm.com [10.1.194.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9326C3F63F; Fri, 15 Aug 2025 01:55:31 -0700 (PDT) From: Kevin Brodsky To: linux-hardening@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Kevin Brodsky , Andrew Morton , Andy Lutomirski , Catalin Marinas , Dave Hansen , David Hildenbrand , Ira Weiny , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Lorenzo Stoakes , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , Quentin Perret , Rick Edgecombe , Ryan Roberts , Thomas Gleixner , Vlastimil Babka , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org Subject: [RFC PATCH v5 02/18] set_memory: Introduce set_memory_pkey() stub Date: Fri, 15 Aug 2025 09:54:56 +0100 Message-ID: <20250815085512.2182322-3-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20250815085512.2182322-1-kevin.brodsky@arm.com> References: <20250815085512.2182322-1-kevin.brodsky@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 add= r, int numpages) } #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ =20 +#ifndef CONFIG_ARCH_HAS_KPKEYS +static inline int set_memory_pkey(unsigned long addr, int numpages, int pk= ey) +{ + return 0; +} +#endif + #endif /* _LINUX_SET_MEMORY_H_ */ --=20 2.47.0