linux-kernel - [PATCH] kexec_file: Adjust type of kexec

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Message-ID: <20170509230639.GA132135@beast>
Date:   Tue, 9 May 2017 16:06:39 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Eric Biederman <ebiederm@...ssion.com>, kexec@...ts.infradead.org,
        Daniel Micay <danielmicay@...il.com>
Subject: [PATCH] kexec_file: Adjust type of kexec_purgatory

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@...il.com>
Signed-off-by: Kees Cook <keescook@...omium.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