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authorPrarit Bhargava <prarit@redhat.com>2016-08-02 21:07:15 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-02 23:35:40 (GMT)
commit841c06d71e25a4e5fe8f7ed4ba7ba4324397f910 (patch)
treea564c568357daa2756ad0ca29230b7d6a20579c8 /init
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/1466124387-20446-1-git-send-email-prarit@redhat.com Signed-off-by: Prarit Bhargava <prarit@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Yang Shi <yang.shi@linaro.org> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Kees Cook <keescook@chromium.org> Cc: Yaowei Bai <baiyaowei@cmss.chinamobile.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'init')
-rw-r--r--init/main.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c
index e7345dc..a8a58e2 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);