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0597579356
module_enable_x() has nothing to do with CONFIG_ARCH_HAS_STRICT_MODULE_RWX allthough by coincidence architectures who need module_enable_x() are selection CONFIG_ARCH_HAS_STRICT_MODULE_RWX. Enable module_enable_x() for everyone everytime. If an architecture already has module text set executable, it's a no-op. Don't check text_size alignment. When CONFIG_STRICT_MODULE_RWX is set the verification is already done in frob_rodata(). When CONFIG_STRICT_MODULE_RWX is not set it is not a big deal to have the start of data as executable. Just make sure we entirely get the last page when the boundary is not aligned. And don't BUG on misaligned base as some architectures like nios2 use kmalloc() for allocating modules. So just bail out in that case. If that's a problem, a page fault will occur later anyway. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
274 lines
7.9 KiB
C
274 lines
7.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* Module internals
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*
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* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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#include <linux/elf.h>
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#include <linux/compiler.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/rculist.h>
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#ifndef ARCH_SHF_SMALL
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#define ARCH_SHF_SMALL 0
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#endif
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/* If this is set, the section belongs in the init part of the module */
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#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG - 1))
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/* Maximum number of characters written by module_flags() */
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#define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4)
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/*
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* Modules' sections will be aligned on page boundaries
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* to ensure complete separation of code and data, but
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* only when CONFIG_STRICT_MODULE_RWX=y
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*/
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#ifdef CONFIG_STRICT_MODULE_RWX
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# define debug_align(X) PAGE_ALIGN(X)
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#else
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# define debug_align(X) (X)
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#endif
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extern struct mutex module_mutex;
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extern struct list_head modules;
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extern struct module_attribute *modinfo_attrs[];
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extern size_t modinfo_attrs_count;
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/* Provided by the linker */
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extern const struct kernel_symbol __start___ksymtab[];
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extern const struct kernel_symbol __stop___ksymtab[];
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extern const struct kernel_symbol __start___ksymtab_gpl[];
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extern const struct kernel_symbol __stop___ksymtab_gpl[];
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extern const s32 __start___kcrctab[];
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extern const s32 __start___kcrctab_gpl[];
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struct load_info {
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const char *name;
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/* pointer to module in temporary copy, freed at end of load_module() */
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struct module *mod;
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Elf_Ehdr *hdr;
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unsigned long len;
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Elf_Shdr *sechdrs;
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char *secstrings, *strtab;
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unsigned long symoffs, stroffs, init_typeoffs, core_typeoffs;
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struct _ddebug *debug;
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unsigned int num_debug;
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bool sig_ok;
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#ifdef CONFIG_KALLSYMS
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unsigned long mod_kallsyms_init_off;
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#endif
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#ifdef CONFIG_MODULE_DECOMPRESS
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struct page **pages;
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unsigned int max_pages;
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unsigned int used_pages;
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#endif
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struct {
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unsigned int sym, str, mod, vers, info, pcpu;
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} index;
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};
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enum mod_license {
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NOT_GPL_ONLY,
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GPL_ONLY,
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};
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struct find_symbol_arg {
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/* Input */
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const char *name;
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bool gplok;
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bool warn;
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/* Output */
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struct module *owner;
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const s32 *crc;
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const struct kernel_symbol *sym;
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enum mod_license license;
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};
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int mod_verify_sig(const void *mod, struct load_info *info);
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int try_to_force_load(struct module *mod, const char *reason);
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bool find_symbol(struct find_symbol_arg *fsa);
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struct module *find_module_all(const char *name, size_t len, bool even_unformed);
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int cmp_name(const void *name, const void *sym);
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long module_get_offset(struct module *mod, unsigned int *size, Elf_Shdr *sechdr,
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unsigned int section);
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char *module_flags(struct module *mod, char *buf);
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static inline unsigned long kernel_symbol_value(const struct kernel_symbol *sym)
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{
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#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
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return (unsigned long)offset_to_ptr(&sym->value_offset);
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#else
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return sym->value;
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#endif
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}
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#ifdef CONFIG_LIVEPATCH
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int copy_module_elf(struct module *mod, struct load_info *info);
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void free_module_elf(struct module *mod);
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#else /* !CONFIG_LIVEPATCH */
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static inline int copy_module_elf(struct module *mod, struct load_info *info)
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{
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return 0;
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}
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static inline void free_module_elf(struct module *mod) { }
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#endif /* CONFIG_LIVEPATCH */
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static inline bool set_livepatch_module(struct module *mod)
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{
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#ifdef CONFIG_LIVEPATCH
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mod->klp = true;
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return true;
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#else
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return false;
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#endif
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}
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#ifdef CONFIG_MODULE_DECOMPRESS
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int module_decompress(struct load_info *info, const void *buf, size_t size);
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void module_decompress_cleanup(struct load_info *info);
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#else
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static inline int module_decompress(struct load_info *info,
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const void *buf, size_t size)
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{
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return -EOPNOTSUPP;
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}
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static inline void module_decompress_cleanup(struct load_info *info)
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{
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}
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#endif
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#ifdef CONFIG_MODULES_TREE_LOOKUP
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struct mod_tree_root {
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struct latch_tree_root root;
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unsigned long addr_min;
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unsigned long addr_max;
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};
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extern struct mod_tree_root mod_tree;
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void mod_tree_insert(struct module *mod);
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void mod_tree_remove_init(struct module *mod);
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void mod_tree_remove(struct module *mod);
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struct module *mod_find(unsigned long addr);
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#else /* !CONFIG_MODULES_TREE_LOOKUP */
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static inline void mod_tree_insert(struct module *mod) { }
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static inline void mod_tree_remove_init(struct module *mod) { }
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static inline void mod_tree_remove(struct module *mod) { }
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static inline struct module *mod_find(unsigned long addr)
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{
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struct module *mod;
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list_for_each_entry_rcu(mod, &modules, list,
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lockdep_is_held(&module_mutex)) {
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if (within_module(addr, mod))
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return mod;
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}
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return NULL;
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}
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#endif /* CONFIG_MODULES_TREE_LOOKUP */
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void frob_text(const struct module_layout *layout, int (*set_memory)(unsigned long start,
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int num_pages));
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#ifdef CONFIG_STRICT_MODULE_RWX
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void module_enable_ro(const struct module *mod, bool after_init);
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void module_enable_nx(const struct module *mod);
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int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
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char *secstrings, struct module *mod);
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#else /* !CONFIG_STRICT_MODULE_RWX */
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static inline void module_enable_nx(const struct module *mod) { }
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static inline void module_enable_ro(const struct module *mod, bool after_init) {}
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static inline int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
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char *secstrings, struct module *mod)
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{
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return 0;
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}
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#endif /* CONFIG_STRICT_MODULE_RWX */
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#ifdef CONFIG_MODULE_SIG
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int module_sig_check(struct load_info *info, int flags);
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#else /* !CONFIG_MODULE_SIG */
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static inline int module_sig_check(struct load_info *info, int flags)
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{
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return 0;
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}
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#endif /* !CONFIG_MODULE_SIG */
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#ifdef CONFIG_DEBUG_KMEMLEAK
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void kmemleak_load_module(const struct module *mod, const struct load_info *info);
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#else /* !CONFIG_DEBUG_KMEMLEAK */
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static inline void kmemleak_load_module(const struct module *mod,
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const struct load_info *info) { }
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#endif /* CONFIG_DEBUG_KMEMLEAK */
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#ifdef CONFIG_KALLSYMS
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void init_build_id(struct module *mod, const struct load_info *info);
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void layout_symtab(struct module *mod, struct load_info *info);
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void add_kallsyms(struct module *mod, const struct load_info *info);
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unsigned long find_kallsyms_symbol_value(struct module *mod, const char *name);
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static inline bool sect_empty(const Elf_Shdr *sect)
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{
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return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
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}
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#else /* !CONFIG_KALLSYMS */
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static inline void init_build_id(struct module *mod, const struct load_info *info) { }
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static inline void layout_symtab(struct module *mod, struct load_info *info) { }
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static inline void add_kallsyms(struct module *mod, const struct load_info *info) { }
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#endif /* CONFIG_KALLSYMS */
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#ifdef CONFIG_SYSFS
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int mod_sysfs_setup(struct module *mod, const struct load_info *info,
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struct kernel_param *kparam, unsigned int num_params);
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void mod_sysfs_teardown(struct module *mod);
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void init_param_lock(struct module *mod);
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#else /* !CONFIG_SYSFS */
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static inline int mod_sysfs_setup(struct module *mod,
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const struct load_info *info,
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struct kernel_param *kparam,
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unsigned int num_params)
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{
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return 0;
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}
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static inline void mod_sysfs_teardown(struct module *mod) { }
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static inline void init_param_lock(struct module *mod) { }
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#endif /* CONFIG_SYSFS */
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#ifdef CONFIG_MODVERSIONS
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int check_version(const struct load_info *info,
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const char *symname, struct module *mod, const s32 *crc);
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void module_layout(struct module *mod, struct modversion_info *ver, struct kernel_param *kp,
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struct kernel_symbol *ks, struct tracepoint * const *tp);
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int check_modstruct_version(const struct load_info *info, struct module *mod);
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int same_magic(const char *amagic, const char *bmagic, bool has_crcs);
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#else /* !CONFIG_MODVERSIONS */
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static inline 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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return 1;
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}
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static inline int check_modstruct_version(const struct load_info *info,
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struct module *mod)
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{
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return 1;
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}
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static inline int same_magic(const char *amagic, const char *bmagic, bool has_crcs)
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{
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return strcmp(amagic, bmagic) == 0;
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}
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#endif /* CONFIG_MODVERSIONS */
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