An ELF file's .note.gnu.property indicates architecture features of the file. These features are extracted earlier and stored in the struct 'arch_elf_state'. Introduce arch_setup_elf_property() to setup and enable these features. The first use-case of this function is shadow stack.
Signed-off-by: Yu-cheng Yu <[email protected]> --- fs/binfmt_elf.c | 4 ++++ include/linux/elf.h | 6 ++++++ 2 files changed, 10 insertions(+) diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index 327a995ff743..d7a4c0a1245e 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -1216,6 +1216,10 @@ static int load_elf_binary(struct linux_binprm *bprm) set_binfmt(&elf_format); + retval = arch_setup_elf_property(&arch_state); + if (retval < 0) + goto out; + #ifdef ARCH_HAS_SETUP_ADDITIONAL_PAGES retval = arch_setup_additional_pages(bprm, !!interpreter); if (retval < 0) diff --git a/include/linux/elf.h b/include/linux/elf.h index 7bdc6da160c7..81f2161fa4a8 100644 --- a/include/linux/elf.h +++ b/include/linux/elf.h @@ -78,9 +78,15 @@ static inline int arch_parse_elf_property(u32 type, const void *data, { return 0; } + +static inline int arch_setup_elf_property(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); +extern int arch_setup_elf_property(struct arch_elf_state *arch); #endif #endif /* _LINUX_ELF_H */ -- 2.21.0
