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Prevent a buffer overflow in mkimage when signing with SHA256

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Due to the FIT_MAX_HASH_LEN constant not having been updated
to support SHA256 signatures one will always see a buffer
overflow in fit_image_process_hash when signing images that
use this larger hash.  This is exposed by vboot_test.sh.

Signed-off-by: Michael van der Westhuizen <michael@smart-africa.com>
Acked-by: Simon Glass <sjg@chromium.org>
[trini: Rework a bit so move the exportable parts of hash.h outside of
 !USE_HOSTCC and only need that as a new include to image.h]
Signed-off-by: Tom Rini <trini@ti.com>
This commit is contained in:
Michael van der Westhuizen 2014-05-30 20:59:00 +02:00 • committed by Tom Rini
parent d835e91d56
commit 1de7bb4f27
2 changed files with 15 additions and 12 deletions
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24
include/hash.h
View file

@ -6,6 +6,18 @@
#ifndef _HASH_H
#define _HASH_H
/*
* Maximum digest size for all algorithms we support. Having this value
* avoids a malloc() or C99 local declaration in common/cmd_hash.c.
*/
#define HASH_MAX_DIGEST_SIZE 32
enum {
HASH_FLAG_VERIFY = 1 << 0, /* Enable verify mode */
HASH_FLAG_ENV = 1 << 1, /* Allow env vars */
};
#ifndef USE_HOSTCC
#if defined(CONFIG_SHA1SUM_VERIFY) || defined(CONFIG_CRC32_VERIFY)
#define CONFIG_HASH_VERIFY
#endif
@ -65,17 +77,6 @@ struct hash_algo {
int size);
};
/*
* Maximum digest size for all algorithms we support. Having this value
* avoids a malloc() or C99 local declaration in common/cmd_hash.c.
*/
#define HASH_MAX_DIGEST_SIZE 32
enum {
HASH_FLAG_VERIFY = 1 << 0, /* Enable verify mode */
HASH_FLAG_ENV = 1 << 1, /* Allow env vars */
};
/**
* hash_command: Process a hash command for a particular algorithm
*
@ -125,4 +126,5 @@ int hash_block(const char *algo_name, const void *data, unsigned int len,
* @return 0 if ok, -EPROTONOSUPPORT for an unknown algorithm.
*/
int hash_lookup_algo(const char *algo_name, struct hash_algo **algop);
#endif /* !USE_HOSTCC */
#endif

3
include/image.h
View file

@ -45,6 +45,7 @@ struct lmb;
#endif /* USE_HOSTCC */
#if defined(CONFIG_FIT)
#include <hash.h>
#include <libfdt.h>
#include <fdt_support.h>
# ifdef CONFIG_SPL_BUILD
@ -706,7 +707,7 @@ int bootz_setup(ulong image, ulong *start, ulong *end);
#define FIT_FDT_PROP "fdt"
#define FIT_DEFAULT_PROP "default"
#define FIT_MAX_HASH_LEN 20 /* max(crc32_len(4), sha1_len(20)) */
#define FIT_MAX_HASH_LEN HASH_MAX_DIGEST_SIZE
/* cmdline argument format parsing */
int fit_parse_conf(const char *spec, ulong addr_curr,