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From 7346c1e192d63cd35f99c7e845e53c5d4d0bdc24 Mon Sep 17 00:00:00 2001
From: Teddy Reed <teddy.reed@gmail.com>
Date: Sat, 9 Jun 2018 11:45:20 -0400
Subject: [PATCH] vboot: Do not use hashed-strings offset
The hashed-strings signature property includes two uint32_t values.
The first is unneeded as there should never be a start offset into the
strings region. The second, the size, is needed because the added
signature node appends to this region.
See tools/image-host.c, where a static 0 value is used for the offset.
Signed-off-by: Teddy Reed <teddy.reed@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Upstream-Status: Backport[http://git.denx.de/?p=u-boot.git;a=commit;
h=7346c1e192d63cd35f99c7e845e53c5d4d0bdc24]
CVE: CVE-2018-1000205
Signed-off-by: Changqing Li <changqing.li@windriver.com>
---
common/image-sig.c | 7 +++++--
tools/image-host.c | 1 +
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/common/image-sig.c b/common/image-sig.c
index 8d2fd10..5a269d3 100644
--- a/common/image-sig.c
+++ b/common/image-sig.c
@@ -377,8 +377,11 @@ int fit_config_check_sig(const void *fit, int noffset, int required_keynode,
/* Add the strings */
strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
if (strings) {
- fdt_regions[count].offset = fdt_off_dt_strings(fit) +
- fdt32_to_cpu(strings[0]);
+ /*
+ * The strings region offset must be a static 0x0.
+ * This is set in tool/image-host.c
+ */
+ fdt_regions[count].offset = fdt_off_dt_strings(fit);
fdt_regions[count].size = fdt32_to_cpu(strings[1]);
count++;
}
diff --git a/tools/image-host.c b/tools/image-host.c
index 8e43671..be2d59b 100644
--- a/tools/image-host.c
+++ b/tools/image-host.c
@@ -135,6 +135,7 @@ static int fit_image_write_sig(void *fit, int noffset, uint8_t *value,
ret = fdt_setprop(fit, noffset, "hashed-nodes",
region_prop, region_proplen);
+ /* This is a legacy offset, it is unused, and must remain 0. */
strdata[0] = 0;
strdata[1] = cpu_to_fdt32(string_size);
if (!ret) {
--
2.7.4
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