[PATCH v2] tools: open FIT image read-only

[Ahelenia Ziemiańska]

Open for reading as O_RDONLY instead of O_RDWR:
the only usage of the fd is for the single read() below;
this prevented
	mkimage -f auto -A arm64 \
		-T kernel -C lz4 -d Image-6.6.15.lz4 \
		-b mt8173-elm-hana-6.6.15.dtb outf
when the inputs were unwritable.

Link: https://bugs.debian.org/1063097
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli at nabijaczleweli.xyz>
Reviewed-by: Dragan Simic <dsimic at manjaro.org>
---
 tools/fit_image.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/fit_image.c b/tools/fit_image.c
index beef1fa8..0fccfbb4 100644
--- a/tools/fit_image.c
+++ b/tools/fit_image.c
@@ -137,7 +137,7 @@ static int fdt_property_file(struct image_tool_params *params,
 	int ret;
 	int fd;
 
-	fd = open(fname, O_RDWR | O_BINARY);
+	fd = open(fname, O_RDONLY | O_BINARY);
 	if (fd < 0) {
 		fprintf(stderr, "%s: Can't open %s: %s\n",
 			params->cmdname, fname, strerror(errno));
-- 
2.39.2
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