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 <jeyu@xxxxxxxxxx>
---
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
--
2.4.3
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