Commit bcf6f55a authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Linus Torvalds
Browse files

kasan: fix kasan_check_read/write definitions

Building little-endian allmodconfig kernels on arm64 started failing
with the generated atomic.h implementation, since we now try to call
kasan helpers from the EFI stub:

  aarch64-linux-gnu-ld: drivers/firmware/efi/libstub/arm-stub.stub.o: in function `atomic_set':
  include/generated/atomic-instrumented.h:44: undefined reference to `__efistub_kasan_check_write'

I suspect that we get similar problems in other files that explicitly
disable KASAN for some reason but call atomic_t based helper functions.

We can fix this by checking the predefined __SANITIZE_ADDRESS__ macro
that the compiler sets instead of checking CONFIG_KASAN, but this in
turn requires a small hack in mm/kasan/common.c so we do see the extern
declaration there instead of the inline function.


Fixes: b1864b828644 ("locking/atomics: build atomic headers as required")
Signed-off-by: default avatarArnd Bergmann <>
Reported-by: default avatarAnders Roxell <>
Acked-by: default avatarAndrey Ryabinin <>
Cc: Ard Biesheuvel <>
Cc: Will Deacon <>
Cc: Mark Rutland <>
Cc: Alexander Potapenko <>
Cc: Dmitry Vyukov <>
Cc: Andrey Konovalov <>
Cc: Stephen Rothwell <>,
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 4117992d
......@@ -2,7 +2,7 @@
#if defined(__SANITIZE_ADDRESS__) || defined(__KASAN_INTERNAL)
void kasan_check_read(const volatile void *p, unsigned int size);
void kasan_check_write(const volatile void *p, unsigned int size);
......@@ -14,6 +14,8 @@
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/init.h>
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