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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4EDA2C5DF74 for ; Tue, 18 Aug 2026 14:11:36 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5ADE76B07BB; Tue, 18 Aug 2026 10:11:35 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 585316B07BD; Tue, 18 Aug 2026 10:11:35 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4C2386B07BE; Tue, 18 Aug 2026 10:11:35 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 30E946B07BB for ; Tue, 18 Aug 2026 10:11:35 -0400 (EDT) Received: from smtpin08.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay06.hostedemail.com (Postfix) with ESMTP id B28DFA2A87 for ; Tue, 18 Aug 2026 14:11:34 +0000 (UTC) X-FDA: 85114578108.08.5C22455 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf27.hostedemail.com (Postfix) with ESMTP id D867B40011 for ; Tue, 18 Aug 2026 14:11:32 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b=GqWBrhBu; spf=pass (imf27.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1787062293; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=O+b83bGMCzyEzByJ+5LU82nBa96lT9m0LV7qEzNfGOc=; b=F4X3kKJf4hIFdScU2krRuaeXaQhJ5LF4FE1cMcCZbx+9cpL0Bq4uWiWzir64kFDLyGpff9 fR5i17Ibqf1ca872/qt+xRADrvHSXE2mjoyno8oEB0psUOTdnf5gI+vNnr4a2HNVHriNMW Q45+WEX6H1eYLKImrsx8iPaP11I1P84= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1787062293; b=CwwQhO/DN6czJ0KT5mK4gjGKLqRSHbLRwtiA8vVqhssmaBPjSDkXDwO4CWGi/qzOF2SN0S 4xefMEa2tbYagWlXzqAZnvhXAp6I8pnrmqL3qMd4Q4cdB9OM6hLKXiW2W/6LkqUhWAoA04 LnFXQZq7Je0S+XU29nRQgIOAOLsj4Gc= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b=GqWBrhBu; spf=pass (imf27.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com; dmarc=pass (policy=none) header.from=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 2AD8B152B; Tue, 18 Aug 2026 07:11:28 -0700 (PDT) Received: from localhost.localdomain (e123572-lin.cambridge.arm.com [10.2.208.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 690E53F85F; Tue, 18 Aug 2026 07:11:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1787062292; bh=+OGpwgzVEkFFPsMOgL6J2ZFY9bOrw4hijWLmgpJn7uk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=GqWBrhBuTT2Z+RmPO2jLniGoqbeXO1MzPDp17DBjTk6bl6eWab6GB6sMhri7bvzCZ ZkuQWZHbRHdq/2nDVNSoTGEdT3paXyJEiQETePGSw3zcJSwQPT4uDOjGeWz7V18zMZ UFO845i7sIb0wTMe6wGNhlTHQ4KzOxZVW3YVXE0Y= From: Kevin Brodsky Date: Tue, 18 Aug 2026 15:08:44 +0100 Subject: [PATCH RFC v9 02/25] set_memory: Introduce set_memory_pkey() stub MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260818-kpkeys-v9-2-743ad31b2c8f@arm.com> References: <20260818-kpkeys-v9-0-743ad31b2c8f@arm.com> In-Reply-To: <20260818-kpkeys-v9-0-743ad31b2c8f@arm.com> To: linux-hardening@vger.kernel.org Cc: Kevin Brodsky , Andrew Morton , Andy Lutomirski , Catalin Marinas , Dave Hansen , "David Hildenbrand (Arm)" , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linu Cherian , Linus Walleij , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , =?utf-8?q?Pierre-Cl=C3=A9ment_Tosi?= , Quentin Perret , Rick Edgecombe , Ryan Roberts , Vlastimil Babka , Will Deacon , Yang Shi , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org, Ira Weiny , Lorenzo Stoakes , Thomas Gleixner X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1787062276; l=917; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=+OGpwgzVEkFFPsMOgL6J2ZFY9bOrw4hijWLmgpJn7uk=; b=fzhJpHPj7MYRTjp/HCw+erSxU/CpJ6la1guJcVIYXR3YYwefH56ufe+Ej8z4qIeVthMvdJfjR FRItISUl4vcBKIMhTDxfFQ0oZ4ArYUUIpp0VT9dk/lF5oTo/1vMcX50 X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= X-Rspam-User: X-Stat-Signature: a5jirqxxteme8erw1iu3s6xbdrn7x3n8 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: D867B40011 X-HE-Tag: 1787062292-902652 X-HE-Meta: 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 dBA7jxLa /cTqDawRVFOL3ZOvpym6MAGfygoGT1nmUQWNGfnaYZTTn5gTD7gCKaofSh1BoCh7WPD0Iq7louts0QERkz6vXHaEiXCIqWMv7xo+aXrR1/e3J0Wyu3OsSvvSjXNWxRgd5o8oPj7SWejXqH1Fg/oa0Ws27c9+6IriYIljcNgST7UOs5N+otAzBU0EGLS7MPep4kJAfS0uECjTkEyHI5sFx/eIRHb0LaWDJhiMNSQ16rGcGBBfG3WCfdvUaJUa8opxQALkv2S4x0Vc7iJXZ0ZAgWW6by3pCx1/fpJw2d7ZpZcf8USw= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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