1 files changed, 91 insertions, 1 deletions

diff --git a/kernel/module.c b/kernel/module.c
index b7205f67cfaf..0d8d21ee792c 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -46,6 +46,8 @@
 #include <asm/cacheflush.h>
 #include <linux/license.h>
 #include <asm/sections.h>
+#include <linux/tracepoint.h>
+#include <linux/ftrace.h>
 
 #if 0
 #define DEBUGP printk
@@ -1430,6 +1432,9 @@ static void free_module(struct module *mod)
         /* Module unload stuff */
         module_unload_free(mod);
 
+        /* release any pointers to mcount in this module */
+        ftrace_release(mod->module_core, mod->core_size);
+
         /* This may be NULL, but that's OK */
         module_free(mod, mod->module_init);
         kfree(mod->args);
@@ -1834,6 +1839,7 @@ static noinline struct module *load_module(void __user *umod,
         Elf_Ehdr *hdr;
         Elf_Shdr *sechdrs;
         char *secstrings, *args, *modmagic, *strtab = NULL;
+        char *staging;
         unsigned int i;
         unsigned int symindex = 0;
         unsigned int strindex = 0;
@@ -1860,9 +1866,13 @@ static noinline struct module *load_module(void __user *umod,
         unsigned int markersindex;
         unsigned int markersstringsindex;
         unsigned int verboseindex;
+        unsigned int tracepointsindex;
+        unsigned int tracepointsstringsindex;
+        unsigned int mcountindex;
         struct module *mod;
         long err = 0;
         void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
+        void *mseg;
         struct exception_table_entry *extable;
         mm_segment_t old_fs;
 
@@ -1989,6 +1999,14 @@ static noinline struct module *load_module(void __user *umod,
                 goto free_hdr;
         }
 
+        staging = get_modinfo(sechdrs, infoindex, "staging");
+        if (staging) {
+                add_taint_module(mod, TAINT_CRAP);
+                printk(KERN_WARNING "%s: module is from the staging directory,"
+                       " the quality is unknown, you have been warned.\n",
+                       mod->name);
+        }
+
         /* Now copy in args */
         args = strndup_user(uargs, ~0UL >> 1);
         if (IS_ERR(args)) {
@@ -2147,6 +2165,12 @@ static noinline struct module *load_module(void __user *umod,
         markersstringsindex = find_sec(hdr, sechdrs, secstrings,
                                         "__markers_strings");
         verboseindex = find_sec(hdr, sechdrs, secstrings, "__verbose");
+        tracepointsindex = find_sec(hdr, sechdrs, secstrings, "__tracepoints");
+        tracepointsstringsindex = find_sec(hdr, sechdrs, secstrings,
+                                        "__tracepoints_strings");
+
+        mcountindex = find_sec(hdr, sechdrs, secstrings,
+                               "__mcount_loc");
 
         /* Now do relocations. */
         for (i = 1; i < hdr->e_shnum; i++) {
@@ -2174,6 +2198,12 @@ static noinline struct module *load_module(void __user *umod,
         mod->num_markers =
                 sechdrs[markersindex].sh_size / sizeof(*mod->markers);
 #endif
+#ifdef CONFIG_TRACEPOINTS
+        mod->tracepoints = (void *)sechdrs[tracepointsindex].sh_addr;
+        mod->num_tracepoints =
+                sechdrs[tracepointsindex].sh_size / sizeof(*mod->tracepoints);
+#endif
+
 
         /* Find duplicate symbols */
         err = verify_export_symbols(mod);
@@ -2192,12 +2222,22 @@ static noinline struct module *load_module(void __user *umod,
 
         add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
 
+        if (!mod->taints) {
 #ifdef CONFIG_MARKERS
-        if (!mod->taints)
                 marker_update_probe_range(mod->markers,
                         mod->markers + mod->num_markers);
 #endif
         dynamic_printk_setup(sechdrs, verboseindex);
+#ifdef CONFIG_TRACEPOINTS
+                tracepoint_update_probe_range(mod->tracepoints,
+                        mod->tracepoints + mod->num_tracepoints);
+#endif
+        }
+
+        /* sechdrs[0].sh_size is always zero */
+        mseg = (void *)sechdrs[mcountindex].sh_addr;
+        ftrace_init_module(mseg, mseg + sechdrs[mcountindex].sh_size);
+
         err = module_finalize(hdr, sechdrs, mod);
         if (err < 0)
                 goto cleanup;
@@ -2267,6 +2307,7 @@ static noinline struct module *load_module(void __user *umod,
  cleanup:
         kobject_del(&mod->mkobj.kobj);
         kobject_put(&mod->mkobj.kobj);
+        ftrace_release(mod->module_core, mod->core_size);
  free_unload:
         module_unload_free(mod);
         module_free(mod, mod->module_init);
@@ -2587,6 +2628,8 @@ static char *module_flags(struct module *mod, char *buf)
                         buf[bx++] = 'P';
                 if (mod->taints & (1 << TAINT_FORCED_MODULE))
                         buf[bx++] = 'F';
+                if (mod->taints & (1 << TAINT_CRAP))
+                        buf[bx++] = 'C';
                 /*
                  * TAINT_FORCED_RMMOD: could be added.
                  * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
@@ -2748,3 +2791,50 @@ void module_update_markers(void)
         mutex_unlock(&module_mutex);
 }
 #endif
+
+#ifdef CONFIG_TRACEPOINTS
+void module_update_tracepoints(void)
+{
+        struct module *mod;
+
+        mutex_lock(&module_mutex);
+        list_for_each_entry(mod, &modules, list)
+                if (!mod->taints)
+                        tracepoint_update_probe_range(mod->tracepoints,
+                                mod->tracepoints + mod->num_tracepoints);
+        mutex_unlock(&module_mutex);
+}
+
+/*
+ * Returns 0 if current not found.
+ * Returns 1 if current found.
+ */
+int module_get_iter_tracepoints(struct tracepoint_iter *iter)
+{
+        struct module *iter_mod;
+        int found = 0;
+
+        mutex_lock(&module_mutex);
+        list_for_each_entry(iter_mod, &modules, list) {
+                if (!iter_mod->taints) {
+                        /*
+                         * Sorted module list
+                         */
+                        if (iter_mod < iter->module)
+                                continue;
+                        else if (iter_mod > iter->module)
+                                iter->tracepoint = NULL;
+                        found = tracepoint_get_iter_range(&iter->tracepoint,
+                                iter_mod->tracepoints,
+                                iter_mod->tracepoints
+                                        + iter_mod->num_tracepoints);
+                        if (found) {
+                                iter->module = iter_mod;
+                                break;
+                        }
+                }
+        }
+        mutex_unlock(&module_mutex);
+        return found;
+}
+#endif