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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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82ce8e2f31
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 Link: https://lkml.kernel.org/r/6a89ffc69666de84721216947c6b6c7dcca39d7d.1725723347.git.christophe.leroy@csgroup.eu Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Kees Cook <kees@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright 2017, Michael Ellerman, IBM Corporation.
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*/
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#ifndef _LINUX_SET_MEMORY_H_
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#define _LINUX_SET_MEMORY_H_
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#ifdef CONFIG_ARCH_HAS_SET_MEMORY
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#include <asm/set_memory.h>
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#else
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static inline int __must_check set_memory_ro(unsigned long addr, int numpages) { return 0; }
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static inline int __must_check set_memory_rw(unsigned long addr, int numpages) { return 0; }
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static inline int __must_check set_memory_x(unsigned long addr, int numpages) { return 0; }
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static inline int __must_check set_memory_nx(unsigned long addr, int numpages) { return 0; }
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#endif
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#ifndef set_memory_rox
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static inline int set_memory_rox(unsigned long addr, int numpages)
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{
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int ret = set_memory_ro(addr, numpages);
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if (ret)
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return ret;
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return set_memory_x(addr, numpages);
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}
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#endif
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#ifndef CONFIG_ARCH_HAS_SET_DIRECT_MAP
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static inline int set_direct_map_invalid_noflush(struct page *page)
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{
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return 0;
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}
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static inline int set_direct_map_default_noflush(struct page *page)
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{
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return 0;
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}
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static inline bool kernel_page_present(struct page *page)
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{
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return true;
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}
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#else /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
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/*
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* Some architectures, e.g. ARM64 can disable direct map modifications at
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* boot time. Let them overrive this query.
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*/
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#ifndef can_set_direct_map
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static inline bool can_set_direct_map(void)
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{
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return true;
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}
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#define can_set_direct_map can_set_direct_map
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#endif
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#endif /* CONFIG_ARCH_HAS_SET_DIRECT_MAP */
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#ifdef CONFIG_X86_64
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int set_mce_nospec(unsigned long pfn);
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int clear_mce_nospec(unsigned long pfn);
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#else
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static inline int set_mce_nospec(unsigned long pfn)
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{
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return 0;
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}
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static inline int clear_mce_nospec(unsigned long pfn)
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{
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return 0;
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}
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#endif
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#ifndef CONFIG_ARCH_HAS_MEM_ENCRYPT
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static inline int set_memory_encrypted(unsigned long addr, int numpages)
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{
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return 0;
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}
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static inline int set_memory_decrypted(unsigned long addr, int numpages)
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{
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return 0;
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}
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#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
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#endif /* _LINUX_SET_MEMORY_H_ */
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