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    Subject[PATCH v5 1/6] Elf: add livepatch-specific Elf constants
    Date
    Livepatch manages its own relocation sections and symbols in order to be
    able to reuse module loader code to write relocations. This removes
    livepatch's dependence on separate "dynrela" sections to write relocations
    and also allows livepatch to patch modules that are not yet loaded.

    The livepatch Elf relocation section flag (SHF_RELA_LIVEPATCH),
    and symbol section index (SHN_LIVEPATCH) allow both livepatch and the
    module loader to identity livepatch relocation sections and livepatch
    symbols.

    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 values of these Elf constants were selected from OS-specific
    ranges according to the definitions from glibc.

    Signed-off-by: Jessica Yu <jeyu@redhat.com>
    ---
    include/uapi/linux/elf.h | 10 ++++++----
    1 file changed, 6 insertions(+), 4 deletions(-)

    diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
    index 71e1d0e..cb4a72f 100644
    --- a/include/uapi/linux/elf.h
    +++ b/include/uapi/linux/elf.h
    @@ -282,16 +282,18 @@ 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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