1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Copyright (C) 2015 Rusty Russell
8 #include <linux/module.h>
10 #include <linux/vmalloc.h>
11 #include <linux/set_memory.h>
14 static int module_set_memory(const struct module *mod, enum mod_mem_type type,
15 int (*set_memory)(unsigned long start, int num_pages))
17 const struct module_memory *mod_mem = &mod->mem[type];
22 set_vm_flush_reset_perms(mod_mem->base);
23 return set_memory((unsigned long)mod_mem->base, mod_mem->size >> PAGE_SHIFT);
27 * Since some arches are moving towards PAGE_KERNEL module allocations instead
28 * of PAGE_KERNEL_EXEC, keep module_enable_x() independent of
29 * CONFIG_STRICT_MODULE_RWX because they are needed regardless of whether we
32 int module_enable_text_rox(const struct module *mod)
34 for_class_mod_mem_type(type, text) {
37 if (IS_ENABLED(CONFIG_STRICT_MODULE_RWX))
38 ret = module_set_memory(mod, type, set_memory_rox);
40 ret = module_set_memory(mod, type, set_memory_x);
47 int module_enable_rodata_ro(const struct module *mod, bool after_init)
51 if (!IS_ENABLED(CONFIG_STRICT_MODULE_RWX) || !rodata_enabled)
54 ret = module_set_memory(mod, MOD_RODATA, set_memory_ro);
57 ret = module_set_memory(mod, MOD_INIT_RODATA, set_memory_ro);
62 return module_set_memory(mod, MOD_RO_AFTER_INIT, set_memory_ro);
67 int module_enable_data_nx(const struct module *mod)
69 if (!IS_ENABLED(CONFIG_STRICT_MODULE_RWX))
72 for_class_mod_mem_type(type, data) {
73 int ret = module_set_memory(mod, type, set_memory_nx);
81 int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
82 char *secstrings, struct module *mod)
84 const unsigned long shf_wx = SHF_WRITE | SHF_EXECINSTR;
87 if (!IS_ENABLED(CONFIG_STRICT_MODULE_RWX))
90 for (i = 0; i < hdr->e_shnum; i++) {
91 if ((sechdrs[i].sh_flags & shf_wx) == shf_wx) {
92 pr_err("%s: section %s (index %d) has invalid WRITE|EXEC flags\n",
93 mod->name, secstrings + sechdrs[i].sh_name, i);