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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475// SPDX-License-Identifier: GPL-2.0-or-later/* * Module livepatch support * * Copyright (C) 2016 Jessica Yu <jeyu@redhat.com> */
#include <linux/module.h>#include <linux/string.h>#include <linux/slab.h>#include "internal.h"
/* * Persist ELF information about a module. Copy the ELF header, * section header table, section string table, and symtab section * index from info to mod->klp_info. */int copy_module_elf(struct module *mod, struct load_info *info){ unsigned int size, symndx; int ret;
size = sizeof(*mod->klp_info); mod->klp_info = kmalloc(size, GFP_KERNEL); if (!mod->klp_info) return -ENOMEM;
/* ELF header */ size = sizeof(mod->klp_info->hdr); memcpy(&mod->klp_info->hdr, info->hdr, size);
/* ELF section header table */ size = sizeof(*info->sechdrs) * info->hdr->e_shnum; mod->klp_info->sechdrs = kmemdup(info->sechdrs, size, GFP_KERNEL); if (!mod->klp_info->sechdrs) { ret = -ENOMEM; goto free_info; }
/* ELF section name string table */ size = info->sechdrs[info->hdr->e_shstrndx].sh_size; mod->klp_info->secstrings = kmemdup(info->secstrings, size, GFP_KERNEL); if (!mod->klp_info->secstrings) { ret = -ENOMEM; goto free_sechdrs; }
/* ELF symbol section index */ symndx = info->index.sym; mod->klp_info->symndx = symndx;
/* * For livepatch modules, core_kallsyms.symtab is a complete * copy of the original symbol table. Adjust sh_addr to point * to core_kallsyms.symtab since the copy of the symtab in module * init memory is freed at the end of do_init_module(). */ mod->klp_info->sechdrs[symndx].sh_addr = (unsigned long)mod->core_kallsyms.symtab;
return 0;
free_sechdrs: kfree(mod->klp_info->sechdrs);free_info: kfree(mod->klp_info); return ret;}
void free_module_elf(struct module *mod){ kfree(mod->klp_info->sechdrs); kfree(mod->klp_info->secstrings); kfree(mod->klp_info);}