diff options
Diffstat (limited to 'kernel/module.c')
| -rw-r--r-- | kernel/module.c | 72 |
1 files changed, 59 insertions, 13 deletions
diff --git a/kernel/module.c b/kernel/module.c index ff961f21135f..cd005fb850af 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -72,13 +72,16 @@ EXPORT_SYMBOL(init_module); /* Find a symbol, return value and the symbol group */ static unsigned long __find_symbol(const char *name, - struct kernel_symbol_group **group) + struct kernel_symbol_group **group, + int gplok) { struct kernel_symbol_group *ks; list_for_each_entry(ks, &symbols, list) { unsigned int i; + if (ks->gplonly && !gplok) + continue; for (i = 0; i < ks->num_syms; i++) { if (strcmp(ks->syms[i].name, name) == 0) { *group = ks; @@ -502,7 +505,7 @@ void __symbol_put(const char *symbol) unsigned long flags; spin_lock_irqsave(&modlist_lock, flags); - if (!__find_symbol(symbol, &ksg)) + if (!__find_symbol(symbol, &ksg, 1)) BUG(); module_put(ksg->owner); spin_unlock_irqrestore(&modlist_lock, flags); @@ -721,7 +724,7 @@ unsigned long find_symbol_internal(Elf_Shdr *sechdrs, } /* Look in other modules... */ spin_lock_irq(&modlist_lock); - ret = __find_symbol(name, ksg); + ret = __find_symbol(name, ksg, mod->license_gplok); if (ret) { /* This can fail due to OOM, or module unloading */ if (!use_module(mod, (*ksg)->owner)) @@ -738,6 +741,7 @@ static void free_module(struct module *mod) list_del(&mod->list); spin_lock_irq(&modlist_lock); list_del(&mod->symbols.list); + list_del(&mod->gpl_symbols.list); list_del(&mod->extable.list); spin_unlock_irq(&modlist_lock); @@ -758,7 +762,7 @@ void *__symbol_get(const char *symbol) unsigned long value, flags; spin_lock_irqsave(&modlist_lock, flags); - value = __find_symbol(symbol, &ksg); + value = __find_symbol(symbol, &ksg, 1); if (value && !strong_try_module_get(ksg->owner)) value = 0; spin_unlock_irqrestore(&modlist_lock, flags); @@ -930,7 +934,34 @@ static void layout_sections(struct module *mod, } } -/* Allocate and load the module */ +static inline int license_is_gpl_compatible(const char *license) +{ + return (strcmp(license, "GPL") == 0 + || strcmp(license, "GPL v2") == 0 + || strcmp(license, "GPL and additional rights") == 0 + || strcmp(license, "Dual BSD/GPL") == 0 + || strcmp(license, "Dual MPL/GPL") == 0); +} + +static void set_license(struct module *mod, Elf_Shdr *sechdrs, int licenseidx) +{ + char *license; + + if (licenseidx) + license = (char *)sechdrs[licenseidx].sh_addr; + else + license = "unspecified"; + + mod->license_gplok = license_is_gpl_compatible(license); + if (!mod->license_gplok) { + printk(KERN_WARNING "%s: module license '%s' taints kernel.\n", + mod->name, license); + tainted |= TAINT_PROPRIETARY_MODULE; + } +} + +/* Allocate and load the module: note that size of section 0 is always + zero, and we rely on this for optional sections. */ static struct module *load_module(void *umod, unsigned long len, const char *uargs) @@ -939,7 +970,7 @@ static struct module *load_module(void *umod, Elf_Shdr *sechdrs; char *secstrings, *args; unsigned int i, symindex, exportindex, strindex, setupindex, exindex, - modindex, obsparmindex; + modindex, obsparmindex, licenseindex, gplindex; long arglen; struct module *mod; long err = 0; @@ -975,7 +1006,7 @@ static struct module *load_module(void *umod, /* May not export symbols, or have setup params, so these may not exist */ - exportindex = setupindex = obsparmindex = 0; + exportindex = setupindex = obsparmindex = gplindex = licenseindex = 0; /* And these should exist, but gcc whinges if we don't init them */ symindex = strindex = exindex = modindex = 0; @@ -1018,6 +1049,16 @@ static struct module *load_module(void *umod, /* Obsolete MODULE_PARM() table */ DEBUGP("Obsolete param found in section %u\n", i); obsparmindex = i; + } else if (strcmp(secstrings+sechdrs[i].sh_name,".init.license") + == 0) { + /* MODULE_LICENSE() */ + DEBUGP("Licence found in section %u\n", i); + licenseindex = i; + } else if (strcmp(secstrings+sechdrs[i].sh_name, + "__gpl_ksymtab") == 0) { + /* EXPORT_SYMBOL_GPL() */ + DEBUGP("GPL symbols found in section %u\n", i); + gplindex = i; } #ifdef CONFIG_KALLSYMS /* symbol and string tables for decoding later. */ @@ -1113,17 +1154,21 @@ static struct module *load_module(void *umod, /* Now we've moved module, initialize linked lists, etc. */ module_unload_init(mod); + /* Set up license info based on contents of section */ + set_license(mod, sechdrs, licenseindex); + /* Fix up syms, so that st_value is a pointer to location. */ err = simplify_symbols(sechdrs, symindex, strindex, mod); if (err < 0) goto cleanup; - /* Set up EXPORTed symbols */ - if (exportindex) { - mod->symbols.num_syms = (sechdrs[exportindex].sh_size - / sizeof(*mod->symbols.syms)); - mod->symbols.syms = (void *)sechdrs[exportindex].sh_addr; - } + /* Set up EXPORTed & EXPORT_GPLed symbols (section 0 is 0 length) */ + mod->symbols.num_syms = (sechdrs[exportindex].sh_size + / sizeof(*mod->symbols.syms)); + mod->symbols.syms = (void *)sechdrs[exportindex].sh_addr; + mod->gpl_symbols.num_syms = (sechdrs[gplindex].sh_size + / sizeof(*mod->symbols.syms)); + mod->gpl_symbols.syms = (void *)sechdrs[gplindex].sh_addr; /* Set up exception table */ if (exindex) { @@ -1228,6 +1273,7 @@ sys_init_module(void *umod, spin_lock_irq(&modlist_lock); list_add(&mod->extable.list, &extables); list_add_tail(&mod->symbols.list, &symbols); + list_add_tail(&mod->gpl_symbols.list, &symbols); spin_unlock_irq(&modlist_lock); list_add(&mod->list, &modules); |