D29460.id86417.diff
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	Index: sys/kern/kern_exec.c
	===================================================================
	--- sys/kern/kern_exec.c
	+++ sys/kern/kern_exec.c
	@@ -37,6 +37,7 @@
	#include <sys/param.h>
	#include <sys/systm.h>
	#include <sys/acct.h>
	+#include <sys/asan.h>
	#include <sys/capsicum.h>
	#include <sys/eventhandler.h>
	#include <sys/exec.h>
	@@ -1328,6 +1329,8 @@
	SLIST_REMOVE_HEAD(&exec_args_kva_freelist, next);
	mtx_unlock(&exec_args_kva_mtx);
	}
	+ kasan_mark((void *)argkva->addr, exec_map_entry_size,
	+ exec_map_entry_size, 0);
	(struct exec_args_kva *)cookie = argkva;
	return (argkva->addr);
	}
	@@ -1338,6 +1341,8 @@
	vm_offset_t base;

	base = argkva->addr;
	+ kasan_mark((void *)argkva->addr, 0, exec_map_entry_size,
	+ KASAN_EXEC_ARGS_FREED);
	if (argkva->gen != gen) {
	(void)vm_map_madvise(exec_map, base, base + exec_map_entry_size,
	MADV_FREE);
	Index: sys/kern/subr_asan.c
	===================================================================
	--- sys/kern/subr_asan.c
	+++ sys/kern/subr_asan.c
	@@ -153,6 +153,8 @@
	return "UMAUseAfterFree";
	case KASAN_KSTACK_FREED:
	return "KernelStack";
	+ case KASAN_EXEC_ARGS_FREED:
	+ return "ExecKVA";
	case 1 ... 7:
	return "RedZonePartial";
	case KASAN_STACK_LEFT:
	Index: sys/sys/asan.h
	===================================================================
	--- sys/sys/asan.h
	+++ sys/sys/asan.h
	@@ -53,6 +53,7 @@
	#define KASAN_KMEM_REDZONE 0xFC
	#define KASAN_UMA_FREED 0xFD
	#define KASAN_KSTACK_FREED 0xFE
	+#define KASAN_EXEC_ARGS_FREED 0xFF

	void kasan_init(void);
	void kasan_shadow_map(void *, size_t);