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device_tree: Add version checks

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This patch adds a few more sanity checks to the FDT header parsing to
make sure that our code can support the version that is passed in.

This patch was adapted from depthcharge's http://crosreview.com/1536384

Change-Id: I06c112f540213c8db7c2455c2e8a4e8e4f337b78
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32862
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Julius Werner
2019-05-03 17:58:07 -07:00
committed by Patrick Georgi
parent 9636a106d4
commit 73eaec8168
3 changed files with 23 additions and 6 deletions
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3
src/include/device_tree.h
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@ -33,7 +33,7 @@ struct fdt_header {
uint32_t reserve_map_offset;
uint32_t version;
uint32_t last_compatible_version;
uint32_t last_comp_version;
uint32_t boot_cpuid_phys;
@ -42,6 +42,7 @@ struct fdt_header {
};
#define FDT_HEADER_MAGIC 0xd00dfeed
#define FDT_SUPPORTED_VERSION 17
#define FDT_TOKEN_BEGIN_NODE 1
#define FDT_TOKEN_END_NODE 2
#define FDT_TOKEN_PROPERTY 3