linux-kernel - [RFC PATCH v2 02/15] set_memory: Introduce set_memory

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Message-ID: <20250108103250.3188419-3-kevin.brodsky@arm.com>
Date: Wed,  8 Jan 2025 10:32:37 +0000
From: Kevin Brodsky <kevin.brodsky@....com>
To: linux-hardening@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Kevin Brodsky <kevin.brodsky@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mark Brown <broonie@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Jann Horn <jannh@...gle.com>,
	Jeff Xu <jeffxu@...omium.org>,
	Joey Gouly <joey.gouly@....com>,
	Kees Cook <kees@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Andy Lutomirski <luto@...nel.org>,
	Marc Zyngier <maz@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Pierre Langlois <pierre.langlois@....com>,
	Quentin Perret <qperret@...gle.com>,
	"Mike Rapoport (IBM)" <rppt@...nel.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Will Deacon <will@...nel.org>,
	Matthew Wilcox <willy@...radead.org>,
	Qi Zheng <zhengqi.arch@...edance.com>,
	linux-arm-kernel@...ts.infradead.org,
	x86@...nel.org
Subject: [RFC PATCH v2 02/15] set_memory: Introduce set_memory_pkey() stub

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 <kevin.brodsky@....com>
---
 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_ */
-- 
2.47.0