X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;f=lib%2Fflash%2Fflash.c;h=707e8007f12e642ff11d52c44575dffb02181065;hb=017aada974ef9c322cad412a9832fa1df265267b;hp=464b8760b54db8cdd2d8b51564f9dbdcf5a81b26;hpb=93d41f97eedca3684922f4c3cae82d4c74b04210;p=petitboot

diff --git a/lib/flash/flash.c b/lib/flash/flash.c
index 464b876..707e800 100644
--- a/lib/flash/flash.c
+++ b/lib/flash/flash.c
@@ -31,6 +31,8 @@
 #include <libflash/file.h>
 #include <libflash/ecc.h>
 
+#define SECURE_BOOT_HEADERS_SIZE 4096
+#define ROM_MAGIC_NUMBER 0x17082011
 
 struct flash_info {
 	/* Device information */
@@ -148,6 +150,16 @@ out:
 	return NULL;
 }
 
+/* See stb_is_container() in Skiboot */
+static bool is_signed(char *buffer, uint32_t len)
+{
+	if (!buffer || len <= SECURE_BOOT_HEADERS_SIZE)
+		return false;
+	if (be32_to_cpu(*(uint32_t *)buffer) != ROM_MAGIC_NUMBER)
+		return false;
+	return true;
+}
+
 int flash_parse_version(void *ctx, char ***versions, bool current)
 {
 	char *saveptr, *tok,  **tmp, *buffer;
@@ -182,6 +194,10 @@ int flash_parse_version(void *ctx, char ***versions, bool current)
 		goto out;
 	}
 
+	/* Check if this partition is signed */
+	if (is_signed(buffer, len))
+		buffer += SECURE_BOOT_HEADERS_SIZE;
+
 	/* open-power-platform */
 	tok = strtok_r(buffer, delim, &saveptr);
 	if (tok) {