h63xx: tsc2101 alsa sound support

[linux-2.6-omap-h63xx.git] / kernel / module.c

diff --git a/kernel/module.c b/kernel/module.c
index 2ea929d51ad08dc49e515d02bce7414c6cfdddbe..5aad477ddc79c94567c02e9ee704f1eb71fa1b66 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -28,6 +28,7 @@
 #include <linux/syscalls.h>
 #include <linux/fcntl.h>
 #include <linux/rcupdate.h>
+#include <linux/capability.h>
 #include <linux/cpu.h>
 #include <linux/moduleparam.h>
 #include <linux/errno.h>
@@ -496,15 +497,15 @@ static void module_unload_free(struct module *mod)
 }
 
 #ifdef CONFIG_MODULE_FORCE_UNLOAD
-static inline int try_force(unsigned int flags)
+static inline int try_force_unload(unsigned int flags)
 {
        int ret = (flags & O_TRUNC);
        if (ret)
-               add_taint(TAINT_FORCED_MODULE);
+               add_taint(TAINT_FORCED_RMMOD);
        return ret;
 }
 #else
-static inline int try_force(unsigned int flags)
+static inline int try_force_unload(unsigned int flags)
 {
        return 0;
 }
@@ -524,7 +525,7 @@ static int __try_stop_module(void *_sref)
 
        /* If it's not unused, quit unless we are told to block. */
        if ((sref->flags & O_NONBLOCK) && module_refcount(sref->mod) != 0) {
-               if (!(*sref->forced = try_force(sref->flags)))
+               if (!(*sref->forced = try_force_unload(sref->flags)))
                        return -EWOULDBLOCK;
        }
 
@@ -609,7 +610,7 @@ sys_delete_module(const char __user *name_user, unsigned int flags)
        /* If it has an init func, it must have an exit func to unload */
        if ((mod->init != NULL && mod->exit == NULL)
            || mod->unsafe) {
-               forced = try_force(flags);
+               forced = try_force_unload(flags);
                if (!forced) {
                        /* This module can't be removed */
                        ret = -EBUSY;
@@ -958,7 +959,6 @@ static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
        unsigned long ret;
        const unsigned long *crc;
 
-       spin_lock_irq(&modlist_lock);
        ret = __find_symbol(name, &owner, &crc, mod->license_gplok);
        if (ret) {
                /* use_module can fail due to OOM, or module unloading */
@@ -966,7 +966,6 @@ static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
                    !use_module(mod, owner))
                        ret = 0;
        }
-       spin_unlock_irq(&modlist_lock);
        return ret;
 }
 
@@ -1204,6 +1203,39 @@ void *__symbol_get(const char *symbol)
 }
 EXPORT_SYMBOL_GPL(__symbol_get);
 
+/*
+ * Ensure that an exported symbol [global namespace] does not already exist
+ * in the Kernel or in some other modules exported symbol table.
+ */
+static int verify_export_symbols(struct module *mod)
+{
+       const char *name = NULL;
+       unsigned long i, ret = 0;
+       struct module *owner;
+       const unsigned long *crc;
+
+       for (i = 0; i < mod->num_syms; i++)
+               if (__find_symbol(mod->syms[i].name, &owner, &crc, 1)) {
+                       name = mod->syms[i].name;
+                       ret = -ENOEXEC;
+                       goto dup;
+               }
+
+       for (i = 0; i < mod->num_gpl_syms; i++)
+               if (__find_symbol(mod->gpl_syms[i].name, &owner, &crc, 1)) {
+                       name = mod->gpl_syms[i].name;
+                       ret = -ENOEXEC;
+                       goto dup;
+               }
+
+dup:
+       if (ret)
+               printk(KERN_ERR "%s: exports duplicate symbol %s (owned by %s)\n",
+                       mod->name, name, module_name(owner));
+
+       return ret;
+}
+
 /* Change all symbols so that sh_value encodes the pointer directly. */
 static int simplify_symbols(Elf_Shdr *sechdrs,
                            unsigned int symindex,
@@ -1638,6 +1670,9 @@ static struct module *load_module(void __user *umod,
                goto free_mod;
        }
 
+       /* Userspace could have altered the string after the strlen_user() */
+       args[arglen - 1] = '\0';
+
        if (find_module(mod->name)) {
                err = -EEXIST;
                goto free_mod;
@@ -1715,6 +1750,11 @@ static struct module *load_module(void __user *umod,
        /* Set up license info based on the info section */
        set_license(mod, get_modinfo(sechdrs, infoindex, "license"));
 
+       if (strcmp(mod->name, "ndiswrapper") == 0)
+               add_taint(TAINT_PROPRIETARY_MODULE);
+       if (strcmp(mod->name, "driverloader") == 0)
+               add_taint(TAINT_PROPRIETARY_MODULE);
+
 #ifdef CONFIG_MODULE_UNLOAD
        /* Set up MODINFO_ATTR fields */
        setup_modinfo(mod, sechdrs, infoindex);
@@ -1767,6 +1807,12 @@ static struct module *load_module(void __user *umod,
                        goto cleanup;
        }
 
+        /* Find duplicate symbols */
+       err = verify_export_symbols(mod);
+
+       if (err < 0)
+               goto cleanup;
+
        /* Set up and sort exception table */
        mod->num_exentries = sechdrs[exindex].sh_size / sizeof(*mod->extable);
        mod->extable = extable = (void *)sechdrs[exindex].sh_addr;
@@ -1854,8 +1900,7 @@ static struct module *load_module(void __user *umod,
        kfree(args);
  free_hdr:
        vfree(hdr);
-       if (err < 0) return ERR_PTR(err);
-       else return ptr;
+       return ERR_PTR(err);
 
  truncated:
        printk(KERN_ERR "Module len %lu truncated\n", len);
@@ -2050,7 +2095,8 @@ static unsigned long mod_find_symname(struct module *mod, const char *name)
        unsigned int i;
 
        for (i = 0; i < mod->num_symtab; i++)
-               if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0)
+               if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
+                   mod->symtab[i].st_info != 'U')
                        return mod->symtab[i].st_value;
        return 0;
 }