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425595a7fc
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>
33 lines
683 B
C
33 lines
683 B
C
/*
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* livepatch.h - s390-specific Kernel Live Patching Core
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*
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* Copyright (c) 2013-2015 SUSE
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* Authors: Jiri Kosina
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* Vojtech Pavlik
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* Jiri Slaby
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#ifndef ASM_LIVEPATCH_H
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#define ASM_LIVEPATCH_H
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#include <linux/module.h>
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static inline int klp_check_compiler_support(void)
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{
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return 0;
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}
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static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
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{
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regs->psw.addr = ip;
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}
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#endif
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