[U-Boot] [PATCH] autoboot: fix bug using with CAAM and AUTOBOOT_ENCRYPTION

[Heiko Schocher]

if  CONFIG_AUTOBOOT_KEYED, CONFIG_AUTOBOOT_ENCRYPTION and
CONFIG_AUTOBOOT_STOP_STR_SHA256 are enabled in conjunction
with CONFIG_SHA_HW_ACCEL and CONFIG_FSL_CAAM, we get the
Error when pressing a key while waiting for bootdelay:

Error: Address arguments are not aligned
CAAM was not setup properly or it is faulty

Reason is, that used variables are not cache aligned,
so malloc this variables cache aligned.

Probably this is also a bugfix for other hw accelerators
than CAAM.

Signed-off-by: Heiko Schocher <hs at denx.de>
---
clean travis build:
https://travis-ci.org/hsdenx/u-boot-test/builds/563021871

Unfortunately, another error in above scenario pops up,
U-Boot crashes now, anybody used sha256 calculation
with CAAM and SHA_HW_ACCEL ?

Nevertheless, this fix is valid, and should be applied,
to get rid of runtime error message.


 common/autoboot.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/common/autoboot.c b/common/autoboot.c
index 94133eaeda..c69104e0e5 100644
--- a/common/autoboot.c
+++ b/common/autoboot.c
@@ -10,6 +10,7 @@
 #include <cli.h>
 #include <console.h>
 #include <fdtdec.h>
+#include <memalign.h>
 #include <menu.h>
 #include <post.h>
 #include <u-boot/sha256.h>
@@ -52,8 +53,8 @@ static int passwd_abort(uint64_t etime)
 {
 	const char *sha_env_str = env_get("bootstopkeysha256");
 	u8 sha_env[SHA256_SUM_LEN];
-	u8 sha[SHA256_SUM_LEN];
-	char presskey[MAX_DELAY_STOP_STR];
+	u8 *sha;
+	char *presskey;
 	const char *algo_name = "sha256";
 	u_int presskey_len = 0;
 	int abort = 0;
@@ -74,6 +75,9 @@ static int passwd_abort(uint64_t etime)
 		return 0;
 	}
 
+	presskey = malloc_cache_aligned(MAX_DELAY_STOP_STR);
+	sha = malloc_cache_aligned(SHA256_SUM_LEN);
+	size = SHA256_SUM_LEN;
 	/*
 	 * We don't know how long the stop-string is, so we need to
 	 * generate the sha256 hash upon each input character and
@@ -82,8 +86,11 @@ static int passwd_abort(uint64_t etime)
 	do {
 		if (tstc()) {
 			/* Check for input string overflow */
-			if (presskey_len >= MAX_DELAY_STOP_STR)
+			if (presskey_len >= MAX_DELAY_STOP_STR) {
+				free(presskey);
+				free(sha);
 				return 0;
+			}
 
 			presskey[presskey_len++] = getc();
 
@@ -97,6 +104,8 @@ static int passwd_abort(uint64_t etime)
 		}
 	} while (!abort && get_ticks() <= etime);
 
+	free(presskey);
+	free(sha);
 	return abort;
 }
 #else
-- 
2.21.0