[PATCH] Export ktime_get_ts()

[pandora-kernel.git] / kernel / module.c

diff --git a/kernel/module.c b/kernel/module.c
index 4b39d37..e427604 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/moduleloader.h>
 #include <linux/init.h>
+#include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/elf.h>
@@ -36,6 +37,7 @@
 #include <linux/stop_machine.h>
 #include <linux/device.h>
 #include <linux/string.h>
+#include <linux/sched.h>
 #include <asm/uaccess.h>
 #include <asm/semaphore.h>
 #include <asm/cacheflush.h>
@@ -494,15 +496,15 @@ 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)
-               tainted |= 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;
 }
@@ -522,7 +524,7 @@ 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;
        }
 
@@ -607,7 +609,7 @@ 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;
@@ -897,7 +899,7 @@ static int check_version(Elf_Shdr *sechdrs,
        if (!(tainted & TAINT_FORCED_MODULE)) {
                printk("%s: no version for \"%s\" found: kernel tainted.\n",
                       mod->name, symname);
-               tainted |= TAINT_FORCED_MODULE;
+               add_taint(TAINT_FORCED_MODULE);
        }
        return 1;
 }
@@ -956,7 +958,6 @@ 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 */
@@ -964,7 +965,6 @@ static unsigned long resolve_symbol(Elf_Shdr *sechdrs,
                    !use_module(mod, owner))
                        ret = 0;
        }
-       spin_unlock_irq(&modlist_lock);
        return ret;
 }
 
@@ -1202,6 +1202,39 @@ 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,
@@ -1352,7 +1385,7 @@ static void set_license(struct module *mod, const char *license)
        if (!mod->license_gplok && !(tainted & TAINT_PROPRIETARY_MODULE)) {
                printk(KERN_WARNING "%s: module license '%s' taints kernel.\n",
                       mod->name, license);
-               tainted |= TAINT_PROPRIETARY_MODULE;
+               add_taint(TAINT_PROPRIETARY_MODULE);
        }
 }
 
@@ -1610,7 +1643,7 @@ static struct module *load_module(void __user *umod,
        modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
        /* This is allowed: modprobe --force will invalidate it. */
        if (!modmagic) {
-               tainted |= TAINT_FORCED_MODULE;
+               add_taint(TAINT_FORCED_MODULE);
                printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
                       mod->name);
        } else if (!same_magic(modmagic, vermagic)) {
@@ -1713,6 +1746,11 @@ 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);
@@ -1739,7 +1777,7 @@ static struct module *load_module(void __user *umod,
            (mod->num_gpl_syms && !gplcrcindex)) {
                printk(KERN_WARNING "%s: No versions for exported symbols."
                       " Tainting kernel.\n", mod->name);
-               tainted |= TAINT_FORCED_MODULE;
+               add_taint(TAINT_FORCED_MODULE);
        }
 #endif
 
@@ -1765,6 +1803,12 @@ 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;
@@ -1852,8 +1896,7 @@ 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);