linux-kernel - [PATCH] sign-file: Fix inplace signing when src and dst names are both specified

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Date:   Tue,  6 Dec 2016 23:20:08 +0300
From:   Alex Yashchenko <alexhoppus111@...il.com>
To:     dhowells@...hat.com
Cc:     keyrings@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alex Yashchenko <alexhoppus111@...il.com>
Subject: [PATCH] sign-file: Fix inplace signing when src and dst names are both specified

When src and dst both are specified and they point to the same file
the sign-file utility will write only signature to the dst file and
the module (.ko file) body will not be written.
That happens because we open the same file with "rb" and "wb" flags,
from fopen man:

 w      Truncate file to zero length or create text file for writing.
The stream is positioned at the beginning of the file.
...
	bm = BIO_new_file(module_name, "rb");
...
	bd = BIO_new_file(dest_name, "wb");
...
	while ((n = BIO_read(bm, buf, sizeof(buf))),
	       n > 0) {
		ERR(BIO_write(bd, buf, n) < 0, "%s", dest_name);
	}
...

Signed-off-by: Alex Yashchenko <alexhoppus111@...il.com>
---
 scripts/sign-file.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/sign-file.c b/scripts/sign-file.c
index 53af6dc..0672c0d 100755
--- a/scripts/sign-file.c
+++ b/scripts/sign-file.c
@@ -267,7 +267,7 @@ int main(int argc, char **argv)
 	}
 	x509_name = argv[2];
 	module_name = argv[3];
-	if (argc == 5) {
+	if (argc == 5 && strcmp(argv[3], argv[4])) {
 		dest_name = argv[4];
 		replace_orig = false;
 	} else {
-- 
1.9.1