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bh=+OGpwgzVEkFFPsMOgL6J2ZFY9bOrw4hijWLmgpJn7uk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=NXGgiha6GINynS7xkcX0uVVxHjHvcpyuF7Tk/QpU/L1V6x4CHZsHCvSUYs0ET6+nz ogt+V9rf6M9baMkmmGSc1m8ROeEoXFuS/FC+MHYGVrDhkuB8nXX/P96j8D/2/W9dzY pEnZJ1K4rGcr6qUXdyJ80DfLZxP3qa6AGXOOPeTE= From: Kevin Brodsky Date: Tue, 26 May 2026 12:15:51 +0100 Subject: [PATCH RFC v8 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: <20260526-kpkeys-v8-2-eaaacdacc67c@arm.com> References: <20260526-kpkeys-v8-0-eaaacdacc67c@arm.com> In-Reply-To: <20260526-kpkeys-v8-0-eaaacdacc67c@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 , Vlastimil Babka , Will Deacon , Yang Shi , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org, Lorenzo Stoakes , Thomas Gleixner X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1779794211; l=917; i=kevin.brodsky@arm.com; s=20260427; h=from:subject:message-id; bh=+OGpwgzVEkFFPsMOgL6J2ZFY9bOrw4hijWLmgpJn7uk=; b=8De/kV8sEljigJjiEvqeCIMnPh9ZNqCIUniOyYuqA+vqWE1URz0rwYAePpTlekHMqoi9dpv9D +dX7ogRAjKbAfS1LyoNEllngretraN0QIiB7BLwfLTbt1YABdnxPt1a X-Developer-Key: i=kevin.brodsky@arm.com; a=ed25519; pk=N2QG+eJKrvkNovwhhwJhnJ4+ScVfsGCHldmqLfcMTFs= X-Stat-Signature: g4bgf9hawwow8ye6cumnrcmsqakmihad X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: E20E040005 X-Rspam-User: X-HE-Tag: 1779794229-869625 X-HE-Meta: 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 qBp9JmsK qKQz1fTFCsHKq2lLPPo+VFMtgQmIpz9fU4EToD8EtV8JojoosDVjkLuZOG/iTleWJ4UnS7BEY6YMyfxRd9wWB/NgP9BFetuBvGZhowfoRYmIqq3vOCgh0Q0Kx2lfIseFXUJIOFJYn63/NuGegdCE5NSFkd60yDwG2H9tVRnLsC2CpbKbIEhrZGQ952rwON0ArHt7lIA/Oq+rslOXyry8YmRFvyOOk25n+LFl/5gejGKdZx5Gd+WO9zAhKDRp7R445YoXVHZ4t99p58aa3wZ83guEoQ10eJUjVac6/pYkWT/yP548MIx1mfCMV4w6Fm1ZrUJ61YE/34v+FLZg= 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