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| author | Nicolas Pitre <nicolas.pitre@linaro.org> | 2017-08-11 07:53:39 +0300 |
|---|---|---|
| committer | Nicolas Pitre <nicolas.pitre@linaro.org> | 2017-09-11 02:31:46 +0300 |
| commit | 382e67aec6a7eea8ed4403e86950b468a191c468 (patch) | |
| tree | 74be0a8304e29a5663419343a3cf62ac5b91ade7 /arch/arm/kernel | |
| parent | 50b2b2e691cd4ff30331ba9a6156b29a07b60f90 (diff) | |
| download | linux-382e67aec6a7eea8ed4403e86950b468a191c468.tar.xz | |
ARM: enable elf_fdpic on systems with an MMU
Provide the necessary changes to be able to execute ELF-FDPIC binaries
on ARM systems with an MMU.
The default for CONFIG_BINFMT_ELF_FDPIC is also set to n if the regular
ELF loader is already configured so not to force FDPIC support on
everyone. Given that CONFIG_BINFMT_ELF depends on CONFIG_MMU, this means
CONFIG_BINFMT_ELF_FDPIC will still default to y when !MMU.
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Mickael GUENE <mickael.guene@st.com>
Tested-by: Vincent Abriou <vincent.abriou@st.com>
Tested-by: Andras Szemzo <szemzo.andras@gmail.com>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/elf.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/arm/kernel/elf.c b/arch/arm/kernel/elf.c index 52fb98358d9d..569e69ece5ca 100644 --- a/arch/arm/kernel/elf.c +++ b/arch/arm/kernel/elf.c @@ -3,6 +3,7 @@ #include <linux/personality.h> #include <linux/binfmts.h> #include <linux/elf.h> +#include <linux/elf-fdpic.h> #include <asm/system_info.h> int elf_check_arch(const struct elf32_hdr *x) @@ -89,3 +90,24 @@ int arm_elf_read_implies_exec(int executable_stack) return 0; } EXPORT_SYMBOL(arm_elf_read_implies_exec); + +#if defined(CONFIG_MMU) && defined(CONFIG_BINFMT_ELF_FDPIC) + +void elf_fdpic_arch_lay_out_mm(struct elf_fdpic_params *exec_params, + struct elf_fdpic_params *interp_params, + unsigned long *start_stack, + unsigned long *start_brk) +{ + elf_set_personality(&exec_params->hdr); + + exec_params->load_addr = 0x8000; + interp_params->load_addr = ELF_ET_DYN_BASE; + *start_stack = TASK_SIZE - SZ_16M; + + if ((exec_params->flags & ELF_FDPIC_FLAG_ARRANGEMENT) == ELF_FDPIC_FLAG_INDEPENDENT) { + exec_params->flags &= ~ELF_FDPIC_FLAG_ARRANGEMENT; + exec_params->flags |= ELF_FDPIC_FLAG_CONSTDISP; + } +} + +#endif |