diff --git a/arch/Kconfig b/arch/Kconfig index 29b0167c088b..24945cee808b 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -888,6 +888,12 @@ config MODULES_USE_ELF_REL Modules only use ELF REL relocations. Modules with ELF RELA relocations will give an error. +config ARCH_WANTS_MODULES_DATA_IN_VMALLOC + bool + help + For architectures like powerpc/32 which have constraints on module + allocation and need to allocate module data outside of module area. + config HAVE_IRQ_EXIT_ON_IRQ_STACK bool help diff --git a/include/linux/module.h b/include/linux/module.h index 5e2059f3afc7..46d4d5f2516e 100644 --- a/include/linux/module.h +++ b/include/linux/module.h @@ -422,6 +422,9 @@ struct module { /* Core layout: rbtree is accessed frequently, so keep together. */ struct module_layout core_layout __module_layout_align; struct module_layout init_layout; +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC + struct module_layout data_layout; +#endif /* Arch-specific module values */ struct mod_arch_specific arch; @@ -569,6 +572,11 @@ bool is_module_text_address(unsigned long addr); static inline bool within_module_core(unsigned long addr, const struct module *mod) { +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC + if ((unsigned long)mod->data_layout.base <= addr && + addr < (unsigned long)mod->data_layout.base + mod->data_layout.size) + return true; +#endif return (unsigned long)mod->core_layout.base <= addr && addr < (unsigned long)mod->core_layout.base + mod->core_layout.size; } diff --git a/kernel/module/internal.h b/kernel/module/internal.h index 0aabbf5cbcd1..3e23bef5884d 100644 --- a/kernel/module/internal.h +++ b/kernel/module/internal.h @@ -20,7 +20,9 @@ /* Maximum number of characters written by module_flags() */ #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4) +#ifndef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC #define data_layout core_layout +#endif /* * Modules' sections will be aligned on page boundaries @@ -154,6 +156,7 @@ struct mod_tree_root { }; extern struct mod_tree_root mod_tree; +extern struct mod_tree_root mod_data_tree; #ifdef CONFIG_MODULES_TREE_LOOKUP void mod_tree_insert(struct module *mod); diff --git a/kernel/module/kdb.c b/kernel/module/kdb.c index a446c699db0a..f4317f92e189 100644 --- a/kernel/module/kdb.c +++ b/kernel/module/kdb.c @@ -26,8 +26,11 @@ int kdb_lsmod(int argc, const char **argv) if (mod->state == MODULE_STATE_UNFORMED) continue; - kdb_printf("%-20s%8u 0x%px ", mod->name, - mod->core_layout.size, (void *)mod); + kdb_printf("%-20s%8u", mod->name, mod->core_layout.size); +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC + kdb_printf("/%8u", mod->data_layout.size); +#endif + kdb_printf(" 0x%px ", (void *)mod); #ifdef CONFIG_MODULE_UNLOAD kdb_printf("%4d ", module_refcount(mod)); #endif @@ -38,6 +41,9 @@ int kdb_lsmod(int argc, const char **argv) else kdb_printf(" (Live)"); kdb_printf(" 0x%px", mod->core_layout.base); +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC + kdb_printf("/0x%px", mod->data_layout.base); +#endif #ifdef CONFIG_MODULE_UNLOAD { diff --git a/kernel/module/main.c b/kernel/module/main.c index 78658283408d..84b828431dcb 100644 --- a/kernel/module/main.c +++ b/kernel/module/main.c @@ -78,6 +78,12 @@ struct mod_tree_root mod_tree __cacheline_aligned = { .addr_min = -1UL, }; +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC +struct mod_tree_root mod_data_tree __cacheline_aligned = { + .addr_min = -1UL, +}; +#endif + #define module_addr_min mod_tree.addr_min #define module_addr_max mod_tree.addr_max @@ -107,6 +113,9 @@ static void mod_update_bounds(struct module *mod) __mod_update_bounds(mod->core_layout.base, mod->core_layout.size, &mod_tree); if (mod->init_layout.size) __mod_update_bounds(mod->init_layout.base, mod->init_layout.size, &mod_tree); +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC + __mod_update_bounds(mod->data_layout.base, mod->data_layout.size, &mod_data_tree); +#endif } static void module_assert_mutex_or_preempt(void) @@ -940,6 +949,17 @@ static ssize_t show_coresize(struct module_attribute *mattr, static struct module_attribute modinfo_coresize = __ATTR(coresize, 0444, show_coresize, NULL); +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC +static ssize_t show_datasize(struct module_attribute *mattr, + struct module_kobject *mk, char *buffer) +{ + return sprintf(buffer, "%u\n", mk->mod->data_layout.size); +} + +static struct module_attribute modinfo_datasize = + __ATTR(datasize, 0444, show_datasize, NULL); +#endif + static ssize_t show_initsize(struct module_attribute *mattr, struct module_kobject *mk, char *buffer) { @@ -968,6 +988,9 @@ struct module_attribute *modinfo_attrs[] = { &modinfo_srcversion, &modinfo_initstate, &modinfo_coresize, +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC + &modinfo_datasize, +#endif &modinfo_initsize, &modinfo_taint, #ifdef CONFIG_MODULE_UNLOAD @@ -1194,6 +1217,9 @@ static void free_module(struct module *mod) /* Finally, free the core (containing the module structure) */ module_memfree(mod->core_layout.base); +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC + vfree(mod->data_layout.base); +#endif } void *__symbol_get(const char *symbol) @@ -2124,6 +2150,24 @@ static int move_module(struct module *mod, struct load_info *info) } else mod->init_layout.base = NULL; +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC + /* Do the allocs. */ + ptr = vmalloc(mod->data_layout.size); + /* + * The pointer to this block is stored in the module structure + * which is inside the block. Just mark it as not being a + * leak. + */ + kmemleak_not_leak(ptr); + if (!ptr) { + module_memfree(mod->core_layout.base); + module_memfree(mod->init_layout.base); + return -ENOMEM; + } + + memset(ptr, 0, mod->data_layout.size); + mod->data_layout.base = ptr; +#endif /* Transfer each section which specifies SHF_ALLOC */ pr_debug("final section addresses:\n"); for (i = 0; i < info->hdr->e_shnum; i++) { @@ -2299,6 +2343,9 @@ static void module_deallocate(struct module *mod, struct load_info *info) module_arch_freeing_init(mod); module_memfree(mod->init_layout.base); module_memfree(mod->core_layout.base); +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC + vfree(mod->data_layout.base); +#endif } int __weak module_finalize(const Elf_Ehdr *hdr, @@ -3015,13 +3062,20 @@ bool is_module_address(unsigned long addr) struct module *__module_address(unsigned long addr) { struct module *mod; + struct mod_tree_root *tree; - if (addr < module_addr_min || addr > module_addr_max) + if (addr >= mod_tree.addr_min && addr <= mod_tree.addr_max) + tree = &mod_tree; +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC + else if (addr >= mod_data_tree.addr_min && addr <= mod_data_tree.addr_max) + tree = &mod_data_tree; +#endif + else return NULL; module_assert_mutex_or_preempt(); - mod = mod_find(addr, &mod_tree); + mod = mod_find(addr, tree); if (mod) { BUG_ON(!within_module(addr, mod)); if (mod->state == MODULE_STATE_UNFORMED) diff --git a/kernel/module/procfs.c b/kernel/module/procfs.c index 2717e130788e..9a8f4f0f6329 100644 --- a/kernel/module/procfs.c +++ b/kernel/module/procfs.c @@ -67,13 +67,17 @@ static int m_show(struct seq_file *m, void *p) struct module *mod = list_entry(p, struct module, list); char buf[MODULE_FLAGS_BUF_SIZE]; void *value; + unsigned int size; /* We always ignore unformed modules. */ if (mod->state == MODULE_STATE_UNFORMED) return 0; - seq_printf(m, "%s %u", - mod->name, mod->init_layout.size + mod->core_layout.size); + size = mod->init_layout.size + mod->core_layout.size; +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC + size += mod->data_layout.size; +#endif + seq_printf(m, "%s %u", mod->name, size); print_unload_info(m, mod); /* Informative for users. */ diff --git a/kernel/module/strict_rwx.c b/kernel/module/strict_rwx.c index fe3c10891407..14fbea66f12f 100644 --- a/kernel/module/strict_rwx.c +++ b/kernel/module/strict_rwx.c @@ -75,6 +75,7 @@ bool module_check_misalignment(const struct module *mod) return false; return layout_check_misalignment(&mod->core_layout) || + layout_check_misalignment(&mod->data_layout) || layout_check_misalignment(&mod->init_layout); } diff --git a/kernel/module/tree_lookup.c b/kernel/module/tree_lookup.c index 995fe68059db..8ec5cfd60496 100644 --- a/kernel/module/tree_lookup.c +++ b/kernel/module/tree_lookup.c @@ -83,6 +83,11 @@ void mod_tree_insert(struct module *mod) __mod_tree_insert(&mod->core_layout.mtn, &mod_tree); if (mod->init_layout.size) __mod_tree_insert(&mod->init_layout.mtn, &mod_tree); + +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC + mod->data_layout.mtn.mod = mod; + __mod_tree_insert(&mod->data_layout.mtn, &mod_data_tree); +#endif } void mod_tree_remove_init(struct module *mod) @@ -95,6 +100,9 @@ void mod_tree_remove(struct module *mod) { __mod_tree_remove(&mod->core_layout.mtn, &mod_tree); mod_tree_remove_init(mod); +#ifdef CONFIG_ARCH_WANTS_MODULES_DATA_IN_VMALLOC + __mod_tree_remove(&mod->data_layout.mtn, &mod_data_tree); +#endif } struct module *mod_find(unsigned long addr, struct mod_tree_root *tree)