[PATCH] kexec_file: Adjust type of kexec_purgatory

[Kees Cook <keescook@chromium.org>]

Defining kexec_purgatory as a zero-length char array upsets compile
time size checking. Since this is entirely runtime sized, switch
this to void *. This silences the warning generated by the future
CONFIG_FORTIFY_SOURCE, which did not like the memcmp() of a "0 byte"
array.

Cc: Daniel Micay <danielmicay@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 kernel/kexec_file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c
index b118735fea9d..bc86f85f1329 100644
--- a/kernel/kexec_file.c
+++ b/kernel/kexec_file.c
@@ -30,7 +30,7 @@
  * Declare these symbols weak so that if architecture provides a purgatory,
  * these will be overridden.
  */
-char __weak kexec_purgatory[0];
+void * __weak kexec_purgatory;
 size_t __weak kexec_purgatory_size = 0;
 
 static int kexec_calculate_store_digests(struct kimage *image);
-- 
2.7.4


-- 
Kees Cook
Pixel Security