[PATCH] /sys/modules: allow full length section names

I've been using systemtap for some debugging and I noticed that it can't
probe a lot of modules.  Turns out it's kind of silly, the sections section
of /sys/module is limited to 32byte filenames and many of the actual
sections are a a bit longer than that.

[akpm@osdl.org: rewrite to use dymanic allocation]
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 24 insertions, 9 deletions

diff --git a/CREDITS b/CREDITS
index 8feb2bb49e35..66e82466dde8 100644
--- a/CREDITS
+++ b/CREDITS
@@ -2478,7 +2478,8 @@ S: Derbyshire DE4 3RL
 S: United Kingdom
 
 N: Ian S. Nelson
-E: ian.nelson@echostar.com
+E: nelsonis@earthlink.net
+P: 1024D/00D3D983 3EFD 7B86 B888 D7E2 29B6  9E97 576F 1B97 00D3 D983
 D: Minor mmap and ide hacks
 S: 1370 Atlantis Ave.
 S: Lafayette CO, 80026
diff --git a/include/linux/module.h b/include/linux/module.h
index d4486cc2e7fe..2c599175c583 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -232,17 +232,17 @@ enum module_state
 };
 
 /* Similar stuff for section attributes. */
-#define MODULE_SECT_NAME_LEN 32
 struct module_sect_attr
 {
         struct module_attribute mattr;
-        char name[MODULE_SECT_NAME_LEN];
+        char *name;
         unsigned long address;
 };
 
 struct module_sect_attrs
 {
         struct attribute_group grp;
+        int nsections;
         struct module_sect_attr attrs[0];
 };
 
diff --git a/kernel/module.c b/kernel/module.c
index b7fe6e840963..05625d5dc758 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -933,6 +933,15 @@ static ssize_t module_sect_show(struct module_attribute *mattr,
         return sprintf(buf, "0x%lx\n", sattr->address);
 }
 
+static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
+{
+        int section;
+
+        for (section = 0; section < sect_attrs->nsections; section++)
+                kfree(sect_attrs->attrs[section].name);
+        kfree(sect_attrs);
+}
+
 static void add_sect_attrs(struct module *mod, unsigned int nsect,
                 char *secstrings, Elf_Shdr *sechdrs)
 {
@@ -949,21 +958,26 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
                         + nloaded * sizeof(sect_attrs->attrs[0]),
                         sizeof(sect_attrs->grp.attrs[0]));
         size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
-        if (! (sect_attrs = kmalloc(size[0] + size[1], GFP_KERNEL)))
+        sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
+        if (sect_attrs == NULL)
                 return;
 
         /* Setup section attributes. */
         sect_attrs->grp.name = "sections";
         sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
 
+        sect_attrs->nsections = 0;
         sattr = &sect_attrs->attrs[0];
         gattr = &sect_attrs->grp.attrs[0];
         for (i = 0; i < nsect; i++) {
                 if (! (sechdrs[i].sh_flags & SHF_ALLOC))
                         continue;
                 sattr->address = sechdrs[i].sh_addr;
-                strlcpy(sattr->name, secstrings + sechdrs[i].sh_name,
-                        MODULE_SECT_NAME_LEN);
+                sattr->name = kstrdup(secstrings + sechdrs[i].sh_name,
+                                        GFP_KERNEL);
+                if (sattr->name == NULL)
+                        goto out;
+                sect_attrs->nsections++;
                 sattr->mattr.show = module_sect_show;
                 sattr->mattr.store = NULL;
                 sattr->mattr.attr.name = sattr->name;
@@ -979,7 +993,7 @@ static void add_sect_attrs(struct module *mod, unsigned int nsect,
         mod->sect_attrs = sect_attrs;
         return;
   out:
-        kfree(sect_attrs);
+        free_sect_attrs(sect_attrs);
 }
 
 static void remove_sect_attrs(struct module *mod)
@@ -989,13 +1003,13 @@ static void remove_sect_attrs(struct module *mod)
                                    &mod->sect_attrs->grp);
                 /* We are positive that no one is using any sect attrs
                  * at this point.  Deallocate immediately. */
-                kfree(mod->sect_attrs);
+                free_sect_attrs(mod->sect_attrs);
                 mod->sect_attrs = NULL;
         }
 }
 
-
 #else
+
 static inline void add_sect_attrs(struct module *mod, unsigned int nsect,
                 char *sectstrings, Elf_Shdr *sechdrs)
 {