[PATCH 4/4] bareboximd: make the '-c' option work again

[Antony Pavlov]

bareboximd with the '-c' option craches while
trying to alter an image file, e.g.:

    barebox$ git describe
    v2021.10.0-125-gd136ec5ac6
    barebox$ make ARCH=arm CROSS_COMPILE=aarch64-linux-gnu- imx_v8_defconfig
    ...
    barebox$ make ARCH=arm CROSS_COMPILE=aarch64-linux-gnu-
    ...
    images built:
    barebox-nxp-imx8mm-evk.img
    barebox-prt-prt8mm.img
    barebox-nxp-imx8mn-evk.img
    barebox-nxp-imx8mp-evk.img
    barebox-nxp-imx8mq-evk.img
    barebox-zii-imx8mq-dev.img
    barebox-phytec-phycore-imx8mq.img
    barebox$ ./scripts/bareboximd images/barebox-phytec-phycore-imx8mq.img
    build: #1 Thu Oct 28 01:11:07 UTC 2021
    buildsystem version:
    crc32: 0x00000000
    release: 2021.10.0-00125-gd136ec5ac6
    barebox$ ./scripts/bareboximd -c images/barebox-phytec-phycore-imx8mq.img
    Segmentation fault (core dumped)

The problem is that the bareboximd uses mmap() on an image file
in read-only mode.

Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
---
 scripts/bareboximd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/bareboximd.c b/scripts/bareboximd.c
index c3dcb4dcf0..fe0d274380 100644
--- a/scripts/bareboximd.c
+++ b/scripts/bareboximd.c
@@ -97,7 +97,7 @@ static int read_file_2(const char *filename, size_t *size, void **outbuf, size_t
 		goto close;
 	}
 
-	buf = mmap(NULL, max_size, PROT_READ, MAP_SHARED, fd, 0);
+	buf = mmap(NULL, max_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 	if (buf == MAP_FAILED ) {
 		buf = malloc(max_size);
 		if (!buf) {
-- 
2.33.0