102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Module version support
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*
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* Copyright (C) 2008 Rusty Russell
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*/
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/printk.h>
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#include "internal.h"
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int check_version(const struct load_info *info,
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const char *symname,
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struct module *mod,
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const s32 *crc)
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{
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Elf_Shdr *sechdrs = info->sechdrs;
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unsigned int versindex = info->index.vers;
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unsigned int i, num_versions;
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struct modversion_info *versions;
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/* Exporting module didn't supply crcs? OK, we're already tainted. */
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if (!crc)
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return 1;
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/* No versions at all? modprobe --force does this. */
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if (versindex == 0)
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return try_to_force_load(mod, symname) == 0;
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versions = (void *)sechdrs[versindex].sh_addr;
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num_versions = sechdrs[versindex].sh_size
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/ sizeof(struct modversion_info);
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for (i = 0; i < num_versions; i++) {
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u32 crcval;
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if (strcmp(versions[i].name, symname) != 0)
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continue;
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crcval = *crc;
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if (versions[i].crc == crcval)
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return 1;
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pr_debug("Found checksum %X vs module %lX\n",
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crcval, versions[i].crc);
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goto bad_version;
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}
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/* Broken toolchain. Warn once, then let it go.. */
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pr_warn_once("%s: no symbol version for %s\n", info->name, symname);
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return 1;
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bad_version:
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pr_warn("%s: disagrees about version of symbol %s\n", info->name, symname);
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return 0;
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}
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int check_modstruct_version(const struct load_info *info,
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struct module *mod)
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{
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struct find_symbol_arg fsa = {
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.name = "module_layout",
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.gplok = true,
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};
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/*
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* Since this should be found in kernel (which can't be removed), no
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* locking is necessary -- use preempt_disable() to placate lockdep.
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*/
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preempt_disable();
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if (!find_symbol(&fsa)) {
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preempt_enable();
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BUG();
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}
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preempt_enable();
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return check_version(info, "module_layout", mod, fsa.crc);
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}
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/* First part is kernel version, which we ignore if module has crcs. */
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int same_magic(const char *amagic, const char *bmagic,
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bool has_crcs)
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{
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if (has_crcs) {
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amagic += strcspn(amagic, " ");
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bmagic += strcspn(bmagic, " ");
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}
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return strcmp(amagic, bmagic) == 0;
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}
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/*
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* Generate the signature for all relevant module structures here.
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* If these change, we don't want to try to parse the module.
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*/
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void module_layout(struct module *mod,
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struct modversion_info *ver,
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struct kernel_param *kp,
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struct kernel_symbol *ks,
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struct tracepoint * const *tp)
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{
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}
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EXPORT_SYMBOL(module_layout);
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