PM / Hibernate: Don't let kasan instrument snapshot.c

Kasan causes the compiler to instrument C code and is used at runtime to
detect accesses to memory that has been freed, or not yet allocated.

The code in snapshot.c saves and restores memory when hibernating. This will
access whole pages in the slab cache that have both free and allocated
areas, resulting in a large number of false positives from Kasan.

Disable instrumentation of this file.

Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index cb880a14cc396eec6af959007011fd6830b14baa..eb4f717705baeb22ef92c98c113541a8cc1b2a8f 100644 (file)
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -1,6 +1,8 @@
 
 ccflags-$(CONFIG_PM_DEBUG)     := -DDEBUG
 
+KASAN_SANITIZE_snapshot.o      := n
+
 obj-y                          += qos.o
 obj-$(CONFIG_PM)               += main.o
 obj-$(CONFIG_VT_CONSOLE_SLEEP) += console.o