aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorPrarit Bhargava <[email protected]>2016-08-02 14:07:15 -0700
committerLinus Torvalds <[email protected]>2016-08-02 19:35:40 -0400
commit841c06d71e25a4e5fe8f7ed4ba7ba4324397f910 (patch)
treea564c568357daa2756ad0ca29230b7d6a20579c8
parentecfaf0c42fc4306b5ec4bf6be01b66f8fe9a9733 (diff)
init: allow blacklisting of module_init functions
sprint_symbol_no_offset() returns the string "function_name [module_name]" where [module_name] is not printed for built in kernel functions. This means that the blacklisting code will fail when comparing module function names with the extended string. This patch adds the functionality to block a module's module_init() function by finding the space in the string and truncating the comparison to that length. Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Prarit Bhargava <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Yang Shi <[email protected]> Cc: Prarit Bhargava <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Rasmus Villemoes <[email protected]> Cc: Kees Cook <[email protected]> Cc: Yaowei Bai <[email protected]> Cc: Andrey Ryabinin <[email protected]> Cc: Rusty Russell <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
-rw-r--r--init/main.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c
index e7345dcaaf05..a8a58e2794a5 100644
--- a/init/main.c
+++ b/init/main.c
@@ -716,6 +716,12 @@ static bool __init_or_module initcall_blacklisted(initcall_t fn)
addr = (unsigned long) dereference_function_descriptor(fn);
sprint_symbol_no_offset(fn_name, addr);
+ /*
+ * fn will be "function_name [module_name]" where [module_name] is not
+ * displayed for built-in init functions. Strip off the [module_name].
+ */
+ strreplace(fn_name, ' ', '\0');
+
list_for_each_entry(entry, &blacklisted_initcalls, next) {
if (!strcmp(fn_name, entry->buf)) {
pr_debug("initcall %s blacklisted\n", fn_name);