livepatch: fix ELF typos
ELF is acronym. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/Y/3vWjQ/SBA5a0i5@p183
This commit is contained in:
Alexey Dobriyan
Petr Mladek
parent
c538944d8e
commit
6486a57f05
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@ -1,8 +1,8 @@
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===========================
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Livepatch module Elf format
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Livepatch module ELF format
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===========================
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This document outlines the Elf format requirements that livepatch modules must follow.
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This document outlines the ELF format requirements that livepatch modules must follow.
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.. Table of Contents
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@ -20,17 +20,17 @@ code. So, instead of duplicating code and re-implementing what the module
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loader can already do, livepatch leverages existing code in the module
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loader to perform the all the arch-specific relocation work. Specifically,
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livepatch reuses the apply_relocate_add() function in the module loader to
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write relocations. The patch module Elf format described in this document
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write relocations. The patch module ELF format described in this document
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enables livepatch to be able to do this. The hope is that this will make
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livepatch more easily portable to other architectures and reduce the amount
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of arch-specific code required to port livepatch to a particular
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architecture.
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Since apply_relocate_add() requires access to a module's section header
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table, symbol table, and relocation section indices, Elf information is
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table, symbol table, and relocation section indices, ELF information is
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preserved for livepatch modules (see section 5). Livepatch manages its own
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relocation sections and symbols, which are described in this document. The
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Elf constants used to mark livepatch symbols and relocation sections were
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ELF constants used to mark livepatch symbols and relocation sections were
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selected from OS-specific ranges according to the definitions from glibc.
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Why does livepatch need to write its own relocations?
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@ -43,7 +43,7 @@ reject the livepatch module. Furthermore, we cannot apply relocations that
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affect modules not yet loaded at patch module load time (e.g. a patch to a
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driver that is not loaded). Formerly, livepatch solved this problem by
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embedding special "dynrela" (dynamic rela) sections in the resulting patch
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module Elf output. Using these dynrela sections, livepatch could resolve
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module ELF output. Using these dynrela sections, livepatch could resolve
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symbols while taking into account its scope and what module the symbol
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belongs to, and then manually apply the dynamic relocations. However this
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approach required livepatch to supply arch-specific code in order to write
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@ -80,7 +80,7 @@ Example:
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3. Livepatch relocation sections
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================================
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A livepatch module manages its own Elf relocation sections to apply
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A livepatch module manages its own ELF relocation sections to apply
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relocations to modules as well as to the kernel (vmlinux) at the
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appropriate time. For example, if a patch module patches a driver that is
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not currently loaded, livepatch will apply the corresponding livepatch
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@ -95,7 +95,7 @@ also possible for a livepatch module to have no livepatch relocation
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sections, as in the case of the sample livepatch module (see
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samples/livepatch).
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Since Elf information is preserved for livepatch modules (see Section 5), a
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Since ELF information is preserved for livepatch modules (see Section 5), a
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livepatch relocation section can be applied simply by passing in the
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appropriate section index to apply_relocate_add(), which then uses it to
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access the relocation section and apply the relocations.
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@ -291,12 +291,12 @@ Examples:
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Note that the 'Ndx' (Section index) for these symbols is SHN_LIVEPATCH (0xff20).
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"OS" means OS-specific.
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5. Symbol table and Elf section access
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5. Symbol table and ELF section access
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======================================
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A livepatch module's symbol table is accessible through module->symtab.
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Since apply_relocate_add() requires access to a module's section headers,
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symbol table, and relocation section indices, Elf information is preserved for
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symbol table, and relocation section indices, ELF information is preserved for
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livepatch modules and is made accessible by the module loader through
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module->klp_info, which is a :c:type:`klp_modinfo` struct. When a livepatch module
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loads, this struct is filled in by the module loader.
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@ -353,9 +353,9 @@ struct mod_kallsyms {
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#ifdef CONFIG_LIVEPATCH
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/**
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* struct klp_modinfo - Elf information preserved from the livepatch module
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* struct klp_modinfo - ELF information preserved from the livepatch module
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*
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* @hdr: Elf header
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* @hdr: ELF header
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* @sechdrs: Section header table
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* @secstrings: String table for the section headers
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* @symndx: The symbol table section index
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@ -523,7 +523,7 @@ struct module {
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bool klp; /* Is this a livepatch module? */
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bool klp_alive;
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/* Elf information */
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/* ELF information */
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struct klp_modinfo *klp_info;
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#endif
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@ -11,7 +11,7 @@
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#include "internal.h"
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/*
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* Persist Elf information about a module. Copy the Elf header,
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* Persist ELF information about a module. Copy the ELF header,
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* section header table, section string table, and symtab section
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* index from info to mod->klp_info.
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*/
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@ -25,11 +25,11 @@ int copy_module_elf(struct module *mod, struct load_info *info)
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if (!mod->klp_info)
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return -ENOMEM;
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/* Elf header */
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/* ELF header */
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size = sizeof(mod->klp_info->hdr);
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memcpy(&mod->klp_info->hdr, info->hdr, size);
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/* Elf section header table */
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/* ELF section header table */
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size = sizeof(*info->sechdrs) * info->hdr->e_shnum;
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mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL);
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if (!mod->klp_info->sechdrs) {
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@ -37,7 +37,7 @@ int copy_module_elf(struct module *mod, struct load_info *info)
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goto free_info;
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}
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/* Elf section name string table */
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/* ELF section name string table */
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size = info->sechdrs[info->hdr->e_shstrndx].sh_size;
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mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL);
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if (!mod->klp_info->secstrings) {
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@ -45,7 +45,7 @@ int copy_module_elf(struct module *mod, struct load_info *info)
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goto free_sechdrs;
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}
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/* Elf symbol section index */
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/* ELF symbol section index */
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symndx = info->index.sym;
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mod->klp_info->symndx = symndx;
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