linux-hardening - [PATCH] set_memory: Add __must

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Message-ID: <6a89ffc69666de84721216947c6b6c7dcca39d7d.1725723347.git.christophe.leroy@csgroup.eu>
Date: Sat,  7 Sep 2024 17:40:42 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <kees@...nel.org>,
	arnd@...db.de
Cc: Christophe Leroy <christophe.leroy@...roup.eu>,
	linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-hardening@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: [PATCH] set_memory: Add __must_check to generic stubs

Following query shows that architectures that don't provide
asm/set_memory.h don't use set_memory_...() functions.

  $ git grep set_memory_ alpha arc csky hexagon loongarch m68k microblaze mips nios2 openrisc parisc sh sparc um xtensa

Following query shows that all core users of set_memory_...()
functions always take returned value into account:

  $ git grep -w -e set_memory_ro -e set_memory_rw -e set_memory_x -e set_memory_nx -e set_memory_rox `find . -maxdepth 1 -type d | grep -v arch | grep /`

set_memory_...() functions can fail, leaving the memory attributes
unchanged. Make sure all callers check the returned code.

Link: https://github.com/KSPP/linux/issues/7
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 include/linux/set_memory.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/set_memory.h b/include/linux/set_memory.h
index 95ac8398ee72..e7aec20fb44f 100644
--- a/include/linux/set_memory.h
+++ b/include/linux/set_memory.h
@@ -8,10 +8,10 @@
 #ifdef CONFIG_ARCH_HAS_SET_MEMORY
 #include <asm/set_memory.h>
 #else
-static inline int set_memory_ro(unsigned long addr, int numpages) { return 0; }
-static inline int set_memory_rw(unsigned long addr, int numpages) { return 0; }
-static inline int set_memory_x(unsigned long addr,  int numpages) { return 0; }
-static inline int set_memory_nx(unsigned long addr, int numpages) { return 0; }
+static inline int __must_check set_memory_ro(unsigned long addr, int numpages) { return 0; }
+static inline int __must_check set_memory_rw(unsigned long addr, int numpages) { return 0; }
+static inline int __must_check set_memory_x(unsigned long addr,  int numpages) { return 0; }
+static inline int __must_check set_memory_nx(unsigned long addr, int numpages) { return 0; }
 #endif
 
 #ifndef set_memory_rox
-- 
2.44.0