Merge branch 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6

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

diff --git a/kernel/module.c b/kernel/module.c
index 8674a39..5f80478 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -890,6 +890,19 @@ static struct module_attribute *modinfo_attrs[] = {
 
 static const char vermagic[] = VERMAGIC_STRING;
 
+static int try_to_force_load(struct module *mod, const char *symname)
+{
+#ifdef CONFIG_MODULE_FORCE_LOAD
+       if (!(tainted & TAINT_FORCED_MODULE))
+               printk("%s: no version for \"%s\" found: kernel tainted.\n",
+                      mod->name, symname);
+       add_taint_module(mod, TAINT_FORCED_MODULE);
+       return 0;
+#else
+       return -ENOEXEC;
+#endif
+}
+
 #ifdef CONFIG_MODVERSIONS
 static int check_version(Elf_Shdr *sechdrs,
                         unsigned int versindex,
@@ -904,6 +917,10 @@ static int check_version(Elf_Shdr *sechdrs,
        if (!crc)
                return 1;
 
+       /* No versions at all?  modprobe --force does this. */
+       if (versindex == 0)
+               return try_to_force_load(mod, symname) == 0;
+
        versions = (void *) sechdrs[versindex].sh_addr;
        num_versions = sechdrs[versindex].sh_size
                / sizeof(struct modversion_info);
@@ -914,18 +931,19 @@ static int check_version(Elf_Shdr *sechdrs,
 
                if (versions[i].crc == *crc)
                        return 1;
-               printk("%s: disagrees about version of symbol %s\n",
-                      mod->name, symname);
                DEBUGP("Found checksum %lX vs module %lX\n",
                       *crc, versions[i].crc);
-               return 0;
+               goto bad_version;
        }
-       /* Not in module's version table.  OK, but that taints the kernel. */
-       if (!(tainted & TAINT_FORCED_MODULE))
-               printk("%s: no version for \"%s\" found: kernel tainted.\n",
-                      mod->name, symname);
-       add_taint_module(mod, TAINT_FORCED_MODULE);
-       return 1;
+
+       printk(KERN_WARNING "%s: no symbol version for %s\n",
+              mod->name, symname);
+       return 0;
+
+bad_version:
+       printk("%s: disagrees about version of symbol %s\n",
+              mod->name, symname);
+       return 0;
 }
 
 static inline int check_modstruct_version(Elf_Shdr *sechdrs,
@@ -939,11 +957,14 @@ static inline int check_modstruct_version(Elf_Shdr *sechdrs,
        return check_version(sechdrs, versindex, "struct_module", mod, crc);
 }
 
-/* First part is kernel version, which we ignore. */
-static inline int same_magic(const char *amagic, const char *bmagic)
+/* First part is kernel version, which we ignore if module has crcs. */
+static inline int same_magic(const char *amagic, const char *bmagic,
+                            bool has_crcs)
 {
-       amagic += strcspn(amagic, " ");
-       bmagic += strcspn(bmagic, " ");
+       if (has_crcs) {
+               amagic += strcspn(amagic, " ");
+               bmagic += strcspn(bmagic, " ");
+       }
        return strcmp(amagic, bmagic) == 0;
 }
 #else
@@ -963,7 +984,8 @@ static inline int check_modstruct_version(Elf_Shdr *sechdrs,
        return 1;
 }
 
-static inline int same_magic(const char *amagic, const char *bmagic)
+static inline int same_magic(const char *amagic, const char *bmagic,
+                            bool has_crcs)
 {
        return strcmp(amagic, bmagic) == 0;
 }
@@ -1315,7 +1337,19 @@ out_unreg:
        kobject_put(&mod->mkobj.kobj);
        return err;
 }
-#endif
+
+static void mod_sysfs_fini(struct module *mod)
+{
+       kobject_put(&mod->mkobj.kobj);
+}
+
+#else /* CONFIG_SYSFS */
+
+static void mod_sysfs_fini(struct module *mod)
+{
+}
+
+#endif /* CONFIG_SYSFS */
 
 static void mod_kobject_remove(struct module *mod)
 {
@@ -1323,7 +1357,7 @@ static void mod_kobject_remove(struct module *mod)
        module_param_sysfs_remove(mod);
        kobject_put(mod->mkobj.drivers_dir);
        kobject_put(mod->holders_dir);
-       kobject_put(&mod->mkobj.kobj);
+       mod_sysfs_fini(mod);
 }
 
 /*
@@ -1758,7 +1792,7 @@ static struct module *load_module(void __user *umod,
 
        /* Sanity checks against insmoding binaries or wrong arch,
            weird elf version */
-       if (memcmp(hdr->e_ident, ELFMAG, 4) != 0
+       if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0
            || hdr->e_type != ET_REL
            || !elf_check_arch(hdr)
            || hdr->e_shentsize != sizeof(*sechdrs)) {
@@ -1853,10 +1887,10 @@ static struct module *load_module(void __user *umod,
        modmagic = get_modinfo(sechdrs, infoindex, "vermagic");
        /* This is allowed: modprobe --force will invalidate it. */
        if (!modmagic) {
-               add_taint_module(mod, TAINT_FORCED_MODULE);
-               printk(KERN_WARNING "%s: no version magic, tainting kernel.\n",
-                      mod->name);
-       } else if (!same_magic(modmagic, vermagic)) {
+               err = try_to_force_load(mod, "magic");
+               if (err)
+                       goto free_hdr;
+       } else if (!same_magic(modmagic, vermagic, versindex)) {
                printk(KERN_ERR "%s: version magic '%s' should be '%s'\n",
                       mod->name, modmagic, vermagic);
                err = -ENOEXEC;
@@ -2006,9 +2040,10 @@ static struct module *load_module(void __user *umod,
            (mod->num_gpl_future_syms && !gplfuturecrcindex) ||
            (mod->num_unused_syms && !unusedcrcindex) ||
            (mod->num_unused_gpl_syms && !unusedgplcrcindex)) {
-               printk(KERN_WARNING "%s: No versions for exported symbols."
-                      " Tainting kernel.\n", mod->name);
-               add_taint_module(mod, TAINT_FORCED_MODULE);
+               printk(KERN_WARNING "%s: No versions for exported symbols.\n", mod->name);
+               err = try_to_force_load(mod, "nocrc");
+               if (err)
+                       goto cleanup;
        }
 #endif
        markersindex = find_sec(hdr, sechdrs, secstrings, "__markers");