Merge tag 'hardening-v6.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull hardening fixes from Kees Cook:

- stackleak: add declarations for global functions (Arnd Bergmann)

- gcc-plugins: randstruct: Only warn about true flexible arrays (Kees
Cook)

- gcc-plugins: latent_entropy: Fix description typo (Konstantin Runov)

* tag 'hardening-v6.7-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
gcc-plugins: latent_entropy: Fix typo (args -> argc) in plugin description
gcc-plugins: randstruct: Only warn about true flexible arrays
stackleak: add declarations for global functions

include/linux/stackleak.h

···
 
 #ifdef CONFIG_GCC_PLUGIN_STACKLEAK
 #include <asm/stacktrace.h>
+#include <linux/linkage.h>
 
 /*
  * The lowest address on tsk's stack which we can plausibly erase.
···
 	t->prev_lowest_stack = t->lowest_stack;
 # endif
 }
+
+asmlinkage void noinstr stackleak_erase(void);
+asmlinkage void noinstr stackleak_erase_on_task_stack(void);
+asmlinkage void noinstr stackleak_erase_off_task_stack(void);
+void __no_caller_saved_registers noinstr stackleak_track_stack(void);
 
 #else /* !CONFIG_GCC_PLUGIN_STACKLEAK */
 static inline void stackleak_task_init(struct task_struct *t) { }

scripts/gcc-plugins/latent_entropy_plugin.c

···
  *	if (argc <= 1)
  *		printf("%s: no command arguments :(\n", *argv);
  *	else
- *		printf("%s: %d command arguments!\n", *argv, args - 1);
+ *		printf("%s: %d command arguments!\n", *argv, argc - 1);
  * }
  *
  * after:
···
  *		// perturb_local_entropy()
  *	} else {
  *		local_entropy ^= 3896280633962944730;
- *		printf("%s: %d command arguments!\n", *argv, args - 1);
+ *		printf("%s: %d command arguments!\n", *argv, argc - 1);
  *	}
  *
  *	// latent_entropy_execute() 4.

scripts/gcc-plugins/randomize_layout_plugin.c

···
 {
 	const_tree fieldtype;
 	const_tree typesize;
-	const_tree elemtype;
-	const_tree elemsize;
 
 	fieldtype = TREE_TYPE(field);
 	typesize = TYPE_SIZE(fieldtype);
···
 	if (TREE_CODE(fieldtype) != ARRAY_TYPE)
 		return false;
 
-	elemtype = TREE_TYPE(fieldtype);
-	elemsize = TYPE_SIZE(elemtype);
-
 	/* size of type is represented in bits */
 
 	if (typesize == NULL_TREE && TYPE_DOMAIN(fieldtype) != NULL_TREE &&
 	    TYPE_MAX_VALUE(TYPE_DOMAIN(fieldtype)) == NULL_TREE)
-		return true;
-
-	if (typesize != NULL_TREE &&
-	    (TREE_CONSTANT(typesize) && (!tree_to_uhwi(typesize) ||
-	     tree_to_uhwi(typesize) == tree_to_uhwi(elemsize))))
 		return true;
 
 	return false;