linux-kernel - [RFC PATCH 02/16] set_memory: Introduce set_memory

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Message-ID: <20241206101110.1646108-3-kevin.brodsky@arm.com>
Date: Fri,  6 Dec 2024 10:10:56 +0000
From: Kevin Brodsky <kevin.brodsky@....com>
To: linux-hardening@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Kevin Brodsky <kevin.brodsky@....com>,
	aruna.ramakrishna@...cle.com,
	broonie@...nel.org,
	catalin.marinas@....com,
	dave.hansen@...ux.intel.com,
	jannh@...gle.com,
	jeffxu@...omium.org,
	joey.gouly@....com,
	kees@...nel.org,
	maz@...nel.org,
	pierre.langlois@....com,
	qperret@...gle.com,
	ryan.roberts@....com,
	will@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	x86@...nel.org
Subject: [RFC PATCH 02/16] 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