usercopy: Remove pointer from overflow report

Using %p was already mostly useless in the usercopy overflow reports, so this removes it entirely to avoid confusion now that %p-hashing is enabled. Fixes: ad67b74 ("printk: hash addresses printed with %p") Signed-off-by: Kees Cook <[email protected]>
shlevy · Jan 15, 2018 · 4f5e838 · 4f5e838
1 parent ae64f9b
commit 4f5e838
Showing 1 changed file with 4 additions and 5 deletions.
diff --git a/mm/usercopy.c b/mm/usercopy.c
@@ -58,12 +58,11 @@ static noinline int check_stack_object(const void *obj, unsigned long len)
 	return GOOD_STACK;
 }
 
-static void report_usercopy(const void *ptr, unsigned long len,
-			    bool to_user, const char *type)
+static void report_usercopy(unsigned long len, bool to_user, const char *type)
 {
-	pr_emerg("kernel memory %s attempt detected %s %p (%s) (%lu bytes)\n",
+	pr_emerg("kernel memory %s attempt detected %s '%s' (%lu bytes)\n",
 		to_user ? "exposure" : "overwrite",
-		to_user ? "from" : "to", ptr, type ? : "unknown", len);
+		to_user ? "from" : "to", type ? : "unknown", len);
 	/*
 	 * For greater effect, it would be nice to do do_group_exit(),
 	 * but BUG() actually hooks all the lock-breaking and per-arch
@@ -261,6 +260,6 @@ void __check_object_size(const void *ptr, unsigned long n, bool to_user)
 		return;
 
 report:
-	report_usercopy(ptr, n, to_user, err);
+	report_usercopy(n, to_user, err);
 }
 EXPORT_SYMBOL(__check_object_size);