kernel/module.c: compare symbol values when marking symbols as exported in /proc/kallsyms.

When there are two symbols in a module with the same name, one of which is
exported, both will be marked as exported in /proc/kallsyms.  There aren't
any instances of this in the current kernel, but it is easy to construct a
simple module with two compilation units that exhibits the problem.

$ objdump -j .text -t testmod.ko | grep foo
00000000 l     F .text	00000032 foo
00000080 g     F .text	00000001 foo
$ sudo insmod testmod.ko
$ grep "T foo" /proc/kallsyms
c28e8000 T foo	[testmod]
c28e8080 T foo	[testmod]

Fix this by comparing the symbol values once we've found the exported
symbol table entry matching the symbol name.  Tested using Ksplice:

$ ksplice-create --patch=this_commit.patch --id=bar .
$ sudo ksplice-apply ksplice-bar.tar.gz
Done!
$ grep "T foo" /proc/kallsyms
c28e8080 T foo	[testmod]

Signed-off-by: Tim Abbott <tabbott@mit.edu>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 8 insertions, 8 deletions

diff --git a/kernel/module.c b/kernel/module.c
index dd2a54155b54..895c5675edb7 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -1725,15 +1725,15 @@ static const struct kernel_symbol *lookup_symbol(const char *name,
         return NULL;
 }
 
-static int is_exported(const char *name, const struct module *mod)
+static int is_exported(const char *name, unsigned long value,
+                       const struct module *mod)
 {
-        if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
-                return 1;
+        const struct kernel_symbol *ks;
+        if (!mod)
+                ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
         else
-                if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
-                        return 1;
-                else
-                        return 0;
+                ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
+        return ks != NULL && ks->value == value;
 }
 
 /* As per nm */
@@ -2504,7 +2504,7 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
                         strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
                                 KSYM_NAME_LEN);
                         strlcpy(module_name, mod->name, MODULE_NAME_LEN);
-                        *exported = is_exported(name, mod);
+                        *exported = is_exported(name, *value, mod);
                         preempt_enable();
                         return 0;
                 }