Merge tag 'hardening-v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull hardening updates from Kees Cook:

 - Introduce and start using TRAILING_OVERLAP() helper for fixing
   embedded flex array instances (Gustavo A. R. Silva)

 - mux: Convert mux_control_ops to a flex array member in mux_chip
   (Thorsten Blum)

 - string: Group str_has_prefix() and strstarts() (Andy Shevchenko)

 - Remove KCOV instrumentation from __init and __head (Ritesh Harjani,
   Kees Cook)

 - Refactor and rename stackleak feature to support Clang

 - Add KUnit test for seq_buf API

 - Fix KUnit fortify test under LTO

* tag 'hardening-v6.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: (22 commits)
  sched/task_stack: Add missing const qualifier to end_of_stack()
  kstack_erase: Support Clang stack depth tracking
  kstack_erase: Add -mgeneral-regs-only to silence Clang warnings
  init.h: Disable sanitizer coverage for __init and __head
  kstack_erase: Disable kstack_erase for all of arm compressed boot code
  x86: Handle KCOV __init vs inline mismatches
  arm64: Handle KCOV __init vs inline mismatches
  s390: Handle KCOV __init vs inline mismatches
  arm: Handle KCOV __init vs inline mismatches
  mips: Handle KCOV __init vs inline mismatch
  powerpc/mm/book3s64: Move kfence and debug_pagealloc related calls to __init section
  configs/hardening: Enable CONFIG_INIT_ON_FREE_DEFAULT_ON
  configs/hardening: Enable CONFIG_KSTACK_ERASE
  stackleak: Split KSTACK_ERASE_CFLAGS from GCC_PLUGINS_CFLAGS
  stackleak: Rename stackleak_track_stack to __sanitizer_cov_stack_depth
  stackleak: Rename STACKLEAK to KSTACK_ERASE
  seq_buf: Introduce KUnit tests
  string: Group str_has_prefix() and strstarts()
  kunit/fortify: Add back "volatile" for sizeof() constants
  acpi: nfit: intel: avoid multiple -Wflex-array-member-not-at-end warnings
  ...

2 files changed, 14 insertions, 14 deletions

diff --git a/drivers/misc/lkdtm/Makefile b/drivers/misc/lkdtm/Makefile
index 39468bd27b85..03ebe33185f9 100644
--- a/drivers/misc/lkdtm/Makefile
+++ b/drivers/misc/lkdtm/Makefile
@@ -8,7 +8,7 @@ lkdtm-$(CONFIG_LKDTM)		+= perms.o
 lkdtm-$(CONFIG_LKDTM)		+= refcount.o
 lkdtm-$(CONFIG_LKDTM)		+= rodata_objcopy.o
 lkdtm-$(CONFIG_LKDTM)		+= usercopy.o
-lkdtm-$(CONFIG_LKDTM)		+= stackleak.o
+lkdtm-$(CONFIG_LKDTM)		+= kstack_erase.o
 lkdtm-$(CONFIG_LKDTM)		+= cfi.o
 lkdtm-$(CONFIG_LKDTM)		+= fortify.o
 lkdtm-$(CONFIG_PPC_64S_HASH_MMU)	+= powerpc.o
diff --git a/drivers/misc/lkdtm/stackleak.c b/drivers/misc/lkdtm/kstack_erase.c
index f1d022160913..4fd9b0bfb874 100644
--- a/drivers/misc/lkdtm/stackleak.c
+++ b/drivers/misc/lkdtm/kstack_erase.c
@@ -1,7 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 /*
  * This code tests that the current task stack is properly erased (filled
- * with STACKLEAK_POISON).
+ * with KSTACK_ERASE_POISON).
  *
  * Authors:
  *   Alexander Popov <alex.popov@linux.com>
@@ -9,9 +9,9 @@
  */
 
 #include "lkdtm.h"
-#include <linux/stackleak.h>
+#include <linux/kstack_erase.h>
 
-#if defined(CONFIG_GCC_PLUGIN_STACKLEAK)
+#if defined(CONFIG_KSTACK_ERASE)
 /*
  * Check that stackleak tracks the lowest stack pointer and erases the stack
  * below this as expected.
@@ -85,7 +85,7 @@ static void noinstr check_stackleak_irqoff(void)
 	while (poison_low > task_stack_low) {
 		poison_low -= sizeof(unsigned long);
 
-		if (*(unsigned long *)poison_low == STACKLEAK_POISON)
+		if (*(unsigned long *)poison_low == KSTACK_ERASE_POISON)
 			continue;
 
 		instrumentation_begin();
@@ -96,7 +96,7 @@ static void noinstr check_stackleak_irqoff(void)
 	}
 
 	instrumentation_begin();
-	pr_info("stackleak stack usage:\n"
+	pr_info("kstack erase stack usage:\n"
 		"  high offset: %lu bytes\n"
 		"  current:     %lu bytes\n"
 		"  lowest:      %lu bytes\n"
@@ -121,7 +121,7 @@ out:
 	instrumentation_end();
 }
 
-static void lkdtm_STACKLEAK_ERASING(void)
+static void lkdtm_KSTACK_ERASE(void)
 {
 	unsigned long flags;
 
@@ -129,19 +129,19 @@ static void lkdtm_STACKLEAK_ERASING(void)
 	check_stackleak_irqoff();
 	local_irq_restore(flags);
 }
-#else /* defined(CONFIG_GCC_PLUGIN_STACKLEAK) */
-static void lkdtm_STACKLEAK_ERASING(void)
+#else /* defined(CONFIG_KSTACK_ERASE) */
+static void lkdtm_KSTACK_ERASE(void)
 {
-	if (IS_ENABLED(CONFIG_HAVE_ARCH_STACKLEAK)) {
-		pr_err("XFAIL: stackleak is not enabled (CONFIG_GCC_PLUGIN_STACKLEAK=n)\n");
+	if (IS_ENABLED(CONFIG_HAVE_ARCH_KSTACK_ERASE)) {
+		pr_err("XFAIL: stackleak is not enabled (CONFIG_KSTACK_ERASE=n)\n");
 	} else {
-		pr_err("XFAIL: stackleak is not supported on this arch (HAVE_ARCH_STACKLEAK=n)\n");
+		pr_err("XFAIL: stackleak is not supported on this arch (HAVE_ARCH_KSTACK_ERASE=n)\n");
 	}
 }
-#endif /* defined(CONFIG_GCC_PLUGIN_STACKLEAK) */
+#endif /* defined(CONFIG_KSTACK_ERASE) */
 
 static struct crashtype crashtypes[] = {
-	CRASHTYPE(STACKLEAK_ERASING),
+	CRASHTYPE(KSTACK_ERASE),
 };
 
 struct crashtype_category stackleak_crashtypes = {