From 425595a7fc2096ab46c741b5ed5372c5ab5bbeac Mon Sep 17 00:00:00 2001 From: Jessica Yu Date: Tue, 22 Mar 2016 20:03:18 -0400 Subject: 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 Reviewed-by: Miroslav Benes Acked-by: Josh Poimboeuf Acked-by: Heiko Carstens # for s390 changes Signed-off-by: Jiri Kosina --- samples/livepatch/livepatch-sample.c | 1 + 1 file changed, 1 insertion(+) (limited to 'samples') diff --git a/samples/livepatch/livepatch-sample.c b/samples/livepatch/livepatch-sample.c index fb8c8614e728..e34f871e69b1 100644 --- a/samples/livepatch/livepatch-sample.c +++ b/samples/livepatch/livepatch-sample.c @@ -89,3 +89,4 @@ static void livepatch_exit(void) module_init(livepatch_init); module_exit(livepatch_exit); MODULE_LICENSE("GPL"); +MODULE_INFO(livepatch, "Y"); -- cgit v1.2.3-59-g8ed1b