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authorPatrick Georgi <patrick@georgi-clan.de>2013-03-09 10:52:50 +0100
committerPatrick Georgi <patrick@georgi-clan.de>2013-03-12 10:23:12 +0100
commitdb2e3aa2578a931924f5bd269b0279bd403263ea (patch)
treec3bd957e33cbda84a951ef4bd5c4bdb6a21a8a61
parent6e7abcd4b58326dc2ea45f1523968d5a099bf6e1 (diff)
downloadcoreboot-db2e3aa2578a931924f5bd269b0279bd403263ea.tar.xz
libpayload: Fix reading x86 CBFS images from RAM
Three issues: 1. the hardcoded dereferenced pointer at 0xfffffffc 2. "RAM media" has no idea about ROM relative addresses 3. off-by-one in RAM media: it's legal to request 4 bytes from 0xfffffffc Change-Id: I671ac12d412c71dc8e8e6114f2ea13f58dd99c1d Signed-off-by: Patrick Georgi <patrick@georgi-clan.de> Reviewed-on: http://review.coreboot.org/2624 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Hung-Te Lin <hungte@chromium.org>
-rw-r--r--payloads/libpayload/libcbfs/cbfs.c10
-rw-r--r--payloads/libpayload/libcbfs/ram_media.c6
2 files changed, 13 insertions, 3 deletions
diff --git a/payloads/libpayload/libcbfs/cbfs.c b/payloads/libpayload/libcbfs/cbfs.c
index 35e48dda27..2fb91bf2d2 100644
--- a/payloads/libpayload/libcbfs/cbfs.c
+++ b/payloads/libpayload/libcbfs/cbfs.c
@@ -65,8 +65,14 @@
#if defined(CONFIG_CBFS_HEADER_ROM_OFFSET) && (CONFIG_CBFS_HEADER_ROM_OFFSET)
# define CBFS_HEADER_ROM_ADDRESS (CONFIG_CBFS_HEADER_ROM_OFFSET)
#else
-// Indirect address: only works on 32bit top-aligned systems.
-# define CBFS_HEADER_ROM_ADDRESS (*(uint32_t*)0xfffffffc)
+/* ugly hack: this assumes that "media" exists
+ in the scope where the macro is used. */
+static uint32_t fetch_x86_header(struct cbfs_media *media)
+{
+ uint32_t *header_ptr = media->map(media, 0xfffffffc, 4);
+ return *header_ptr;
+}
+# define CBFS_HEADER_ROM_ADDRESS fetch_x86_header(media)
#endif
#include "cbfs_core.c"
diff --git a/payloads/libpayload/libcbfs/ram_media.c b/payloads/libpayload/libcbfs/ram_media.c
index 87b5292b63..1a0500e1be 100644
--- a/payloads/libpayload/libcbfs/ram_media.c
+++ b/payloads/libpayload/libcbfs/ram_media.c
@@ -43,7 +43,11 @@ static int ram_open(struct cbfs_media *media) {
static void *ram_map(struct cbfs_media *media, size_t offset, size_t count) {
struct ram_media *m = (struct ram_media*)media->context;
- if (offset + count >= m->size) {
+ /* assume addressing from top of image in this case */
+ if (offset > 0xf0000000) {
+ offset = m->size + offset;
+ }
+ if (offset + count > m->size) {
printf("ERROR: ram_map: request out of range (0x%x+0x%x)\n",
offset, count);
return NULL;