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| author | Jessica Yu <jeyu@redhat.com> | 2016-03-23 03:03:18 +0300 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2016-04-01 16:00:11 +0300 |
| commit | 425595a7fc2096ab46c741b5ed5372c5ab5bbeac (patch) | |
| tree | 9cf12348ba352e7679be0aadf370aa0a7bc5509e /arch/x86/include/asm/livepatch.h | |
| parent | f31e0960f395df0c9197de53674365e2a28a129b (diff) | |
| download | linux-425595a7fc2096ab46c741b5ed5372c5ab5bbeac.tar.xz | |
livepatch: reuse module loader code to write relocations
Reuse module loader code to write relocations, thereby eliminating the need
for architecture specific relocation code in livepatch. Specifically, reuse
the apply_relocate_add() function in the module loader to write relocations
instead of duplicating functionality in livepatch's arch-dependent
klp_write_module_reloc() function.
In order to accomplish this, livepatch modules manage their own relocation
sections (marked with the SHF_RELA_LIVEPATCH section flag) and
livepatch-specific symbols (marked with SHN_LIVEPATCH symbol section
index). To apply livepatch relocation sections, livepatch symbols
referenced by relocs are resolved and then apply_relocate_add() is called
to apply those relocations.
In addition, remove x86 livepatch relocation code and the s390
klp_write_module_reloc() function stub. They are no longer needed since
relocation work has been offloaded to module loader.
Lastly, mark the module as a livepatch module so that the module loader
canappropriately identify and initialize it.
Signed-off-by: Jessica Yu <jeyu@redhat.com>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # for s390 changes
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'arch/x86/include/asm/livepatch.h')
| -rw-r--r-- | arch/x86/include/asm/livepatch.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/x86/include/asm/livepatch.h b/arch/x86/include/asm/livepatch.h index 7e68f9558552..a7f9181f63f3 100644 --- a/arch/x86/include/asm/livepatch.h +++ b/arch/x86/include/asm/livepatch.h @@ -32,8 +32,6 @@ static inline int klp_check_compiler_support(void) #endif return 0; } -int klp_write_module_reloc(struct module *mod, unsigned long type, - unsigned long loc, unsigned long value); static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip) { |