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ELF: Add ELF program property parsing support

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ELF program properties will be needed for detecting whether to
enable optional architecture or ABI features for a new ELF process.

For now, there are no generic properties that we care about, so do
nothing unless CONFIG_ARCH_USE_GNU_PROPERTY=y.

Otherwise, the presence of properties using the PT_PROGRAM_PROPERTY
phdrs entry (if any), and notify each property to the arch code.

For now, the added code is not used.

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Dave Martin
2020-03-16 16:50:44 +00:00
committed by Catalin Marinas
parent db751e309f
commit 00e19ceec8
4 changed files with 154 additions and 0 deletions
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19
include/linux/elf.h
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@@ -22,6 +22,9 @@
SET_PERSONALITY(ex)
#endif
#define ELF32_GNU_PROPERTY_ALIGN 4
#define ELF64_GNU_PROPERTY_ALIGN 8
#if ELF_CLASS == ELFCLASS32
extern Elf32_Dyn _DYNAMIC [];
@@ -32,6 +35,7 @@ extern Elf32_Dyn _DYNAMIC [];
#define elf_addr_t Elf32_Off
#define Elf_Half Elf32_Half
#define Elf_Word Elf32_Word
#define ELF_GNU_PROPERTY_ALIGN ELF32_GNU_PROPERTY_ALIGN
#else
@@ -43,6 +47,7 @@ extern Elf64_Dyn _DYNAMIC [];
#define elf_addr_t Elf64_Off
#define Elf_Half Elf64_Half
#define Elf_Word Elf64_Word
#define ELF_GNU_PROPERTY_ALIGN ELF64_GNU_PROPERTY_ALIGN
#endif
@@ -68,4 +73,18 @@ struct gnu_property {
u32 pr_datasz;
};
struct arch_elf_state;
#ifndef CONFIG_ARCH_USE_GNU_PROPERTY
static inline int arch_parse_elf_property(u32 type, const void *data,
size_t datasz, bool compat,
struct arch_elf_state *arch)
{
return 0;
}
#else
extern int arch_parse_elf_property(u32 type, const void *data, size_t datasz,
bool compat, struct arch_elf_state *arch);
#endif
#endif /* _LINUX_ELF_H */