diff options
| author | Nicolas Pitre <nicolas.pitre@linaro.org> | 2017-08-11 00:53:39 -0400 |
|---|---|---|
| committer | Nicolas Pitre <nicolas.pitre@linaro.org> | 2017-09-10 19:31:46 -0400 |
| commit | 382e67aec6a7eea8ed4403e86950b468a191c468 (patch) | |
| tree | 74be0a8304e29a5663419343a3cf62ac5b91ade7 | |
| parent | 50b2b2e691cd4ff30331ba9a6156b29a07b60f90 (diff) | |
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>
| -rw-r--r-- | arch/arm/include/asm/mmu.h | 4 | ||||
| -rw-r--r-- | arch/arm/kernel/elf.c | 22 | ||||
| -rw-r--r-- | fs/Kconfig.binfmt | 4 | ||||
| -rw-r--r-- | fs/binfmt_elf_fdpic.c | 5 |
4 files changed, 33 insertions, 2 deletions
diff --git a/arch/arm/include/asm/mmu.h b/arch/arm/include/asm/mmu.h index e0eb16680a5b..bdec37c6ac35 100644 --- a/arch/arm/include/asm/mmu.h +++ b/arch/arm/include/asm/mmu.h @@ -14,6 +14,10 @@ typedef struct { #ifdef CONFIG_VDSO unsigned long vdso; #endif +#ifdef CONFIG_BINFMT_ELF_FDPIC + unsigned long exec_fdpic_loadmap; + unsigned long interp_fdpic_loadmap; +#endif } mm_context_t; #ifdef CONFIG_CPU_HAS_ASID 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 diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt index 6ef70ce8e976..58c2bbd385ad 100644 --- a/fs/Kconfig.binfmt +++ b/fs/Kconfig.binfmt @@ -34,8 +34,8 @@ config ARCH_BINFMT_ELF_STATE config BINFMT_ELF_FDPIC bool "Kernel support for FDPIC ELF binaries" - default y - depends on ((ARM && !MMU) || FRV || BLACKFIN || (SUPERH32 && !MMU) || C6X) + default y if !BINFMT_ELF + depends on (ARM || FRV || BLACKFIN || (SUPERH32 && !MMU) || C6X) select ELFCORE help ELF FDPIC binaries are based on ELF, but allow the individual load diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c index cf93a4fad012..692e2a1fd2bb 100644 --- a/fs/binfmt_elf_fdpic.c +++ b/fs/binfmt_elf_fdpic.c @@ -377,6 +377,11 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm) executable_stack); if (retval < 0) goto error; +#ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES + retval = arch_setup_additional_pages(bprm, !!interpreter_name); + if (retval < 0) + goto error; +#endif #endif /* load the executable and interpreter into memory */ |