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 89441FF8855 for ; Tue, 5 May 2026 16:07:24 +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:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=O+b83bGMCzyEzByJ+5LU82nBa96lT9m0LV7qEzNfGOc=; b=WK3qNXphh8RiSDlZ2lLflyiucw h6cY/nazS92/8M52NkzP7Lv5suUg8VZRlUSA2CkybxKnugQbP0Ei54p1ISgrCM8tjep3f1Xz6AGXT QZ3t0Vq7cRJkBfT1E0PtreNqM1DxX5thQmMQ8X4Ep5cxTMm2kWq77iP0ozEPqpgsP/Cgq/kjURSDp qyErj7Yy2Y7gQ/AkL4iijxfeQEA715GAi6Y6tKykd7X2Gf3sgblnCs+rQDSNoBSHhiMiBY8wevaxZ pwx3SeZwhIAw2rRzKS++WSipUtzGHrL1eZLxb0aXLjmmo9VlD9XbWD24MFqT68UyHB53vYYh/41F+ +abCmc7A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wKIIn-0000000Gmgc-2Qu1; Tue, 05 May 2026 16:07:17 +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 1wKIIl-0000000GmeQ-1Jff for linux-arm-kernel@lists.infradead.org; Tue, 05 May 2026 16:07:16 +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 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 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= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260505_090715_432756_06B63CA4 X-CRM114-Status: GOOD ( 10.07 ) 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 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