[RFC PATCH v2 1/6] Elf: add livepatch-specific Elf constants
From: Jessica Yu <hidden>
Date: 2015-12-01 04:21:35
Also in:
linux-s390, lkml
Subsystem:
exec & binfmt api, elf, the rest · Maintainers:
Kees Cook, Linus Torvalds
Add livepatch Elf relocation section flag (SHF_RELA_LIVEPATCH), livepatch symbol bind (STB_LIVEPATCH_EXT) and section index (SHN_LIVEPATCH). The values of these Elf constants were selected from OS-specific ranges according to the definitions from glibc. Livepatch relocation sections are marked with SHF_RELA_LIVEPATCH to indicate to the module loader that it should not apply that relocation section and that livepatch will handle them. The SHN_LIVEPATCH shndx marks symbols that will be resolved by livepatch. The module loader ignores these symbols and does not attempt to resolve them. The STB_LIVEPATCH_EXT symbol bind marks the scope of certain livepatch symbols, so that livepatch can appropriately resolve them. Signed-off-by: Jessica Yu <redacted> --- include/uapi/linux/elf.h | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
index 71e1d0e..95ff318 100644
--- a/include/uapi/linux/elf.h
+++ b/include/uapi/linux/elf.h@@ -115,9 +115,10 @@ typedef __s64 Elf64_Sxword; #define DT_HIPROC 0x7fffffff /* This info is needed when parsing the symbol table */ -#define STB_LOCAL 0 -#define STB_GLOBAL 1 -#define STB_WEAK 2 +#define STB_LOCAL 0 +#define STB_GLOBAL 1 +#define STB_WEAK 2 +#define STB_LIVEPATCH_EXT 11 #define STT_NOTYPE 0 #define STT_OBJECT 1
@@ -282,16 +283,18 @@ typedef struct elf64_phdr { #define SHT_HIUSER 0xffffffff /* sh_flags */ -#define SHF_WRITE 0x1 -#define SHF_ALLOC 0x2 -#define SHF_EXECINSTR 0x4 -#define SHF_MASKPROC 0xf0000000 +#define SHF_WRITE 0x1 +#define SHF_ALLOC 0x2 +#define SHF_EXECINSTR 0x4 +#define SHF_RELA_LIVEPATCH 0x00100000 +#define SHF_MASKPROC 0xf0000000 /* special section indexes */ #define SHN_UNDEF 0 #define SHN_LORESERVE 0xff00 #define SHN_LOPROC 0xff00 #define SHN_HIPROC 0xff1f +#define SHN_LIVEPATCH 0xff20 #define SHN_ABS 0xfff1 #define SHN_COMMON 0xfff2 #define SHN_HIRESERVE 0xffff
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2.4.3