remoteproc: bail out if firmware has different endianess

At this point we don't support remote processors that have
a different endianess than the host.

Look out for these unsupported scenarios, and bail out if
encountered.

Reported-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Cc: Mark Grosen <mgrosen@ti.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 6212b82..567a3c5 100644 (file)
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -39,6 +39,7 @@
 #include <linux/elf.h>
 #include <linux/virtio_ids.h>
 #include <linux/virtio_ring.h>
+#include <asm/byteorder.h>
 
 #include "remoteproc_internal.h"
 
@@ -851,6 +852,16 @@ static int rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
 
        ehdr = (struct elf32_hdr *)fw->data;
 
+       /* We assume the firmware has the same endianess as the host */
+# ifdef __LITTLE_ENDIAN
+       if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {
+# else /* BIG ENDIAN */
+       if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB) {
+# endif
+               dev_err(dev, "Unsupported firmware endianess\n");
+               return -EINVAL;
+       }
+
        if (fw->size < ehdr->e_shoff + sizeof(struct elf32_shdr)) {
                dev_err(dev, "Image is too small\n");
                return -EINVAL;