diff options
author | dp-arm <dimitris.papastamos@arm.com> | 2017-02-28 14:43:15 +0000 |
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committer | dp-arm <dimitris.papastamos@arm.com> | 2017-03-31 13:58:51 +0100 |
commit | e6d2aea159f4b88fc128ae62432c8fff4b0c2e5f (patch) | |
tree | 019b41e62ac3b43769d0ce1cf9c72732e367299e /plat/arm/board/juno/juno_stack_protector.c | |
parent | df9a39eaa956a42020f436d4fe5fb47d5ae793d0 (diff) | |
download | trusted-firmware-a-e6d2aea159f4b88fc128ae62432c8fff4b0c2e5f.tar.gz |
Juno: Initialize stack protector canary from the trusted entropy source
Change-Id: I7f3e4bfd46613c6311ba4015d56705414fd6feab
Signed-off-by: dp-arm <dimitris.papastamos@arm.com>
Diffstat (limited to 'plat/arm/board/juno/juno_stack_protector.c')
-rw-r--r-- | plat/arm/board/juno/juno_stack_protector.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/plat/arm/board/juno/juno_stack_protector.c b/plat/arm/board/juno/juno_stack_protector.c new file mode 100644 index 0000000000..720a522e1a --- /dev/null +++ b/plat/arm/board/juno/juno_stack_protector.c @@ -0,0 +1,55 @@ +/* + * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * Redistributions of source code must retain the above copyright notice, this + * list of conditions and the following disclaimer. + * + * Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * + * Neither the name of ARM nor the names of its contributors may be used + * to endorse or promote products derived from this software without specific + * prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +#include <arch_helpers.h> +#include <debug.h> +#include <utils.h> +#include "juno_decl.h" +#include "juno_def.h" + +u_register_t plat_get_stack_protector_canary(void) +{ + u_register_t c[TRNG_NBYTES / sizeof(u_register_t)]; + u_register_t ret = 0; + size_t i; + + if (juno_getentropy(c, sizeof(c)) != 0) { + ERROR("Not enough entropy to initialize canary value\n"); + panic(); + } + + /* + * On Juno we get 128-bits of entropy in one round. + * Fuse the values together to form the canary. + */ + for (i = 0; i < ARRAY_SIZE(c); i++) + ret ^= c[i]; + return ret; +} |