[RFC PATCH v9 23/27] ELF: Introduce arch_setup_elf_property()
From: Yu-cheng Yu <hidden>
Date: 2020-02-05 18:21:08
Also in:
linux-api, linux-arch, linux-mm, lkml
Subsystem:
exec & binfmt api, elf, filesystems (vfs and infrastructure), the rest · Maintainers:
Kees Cook, Alexander Viro, Christian Brauner, Linus Torvalds
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 and Indirect Branch Tracking, which are introduced later. Signed-off-by: Yu-cheng Yu <redacted> --- 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 054446f93442..56fe6cd437fe 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c@@ -1213,6 +1213,10 @@ 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 */
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2.21.0