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vboot: Add VB2_CONTEXT_EC_TRUSTED 

This patch makes coreboot set VB2_CONTEXT_EC_TRUSTED based on the EC"s
boot mode. Vboot will check VB2_CONTEXT_EC_TRUSTED to determine
whether it can enter recovery mode or not.

BUG=b:180927027, b:187871195
BRANCH=none
TEST=build

Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Change-Id: I9fa09dd7ae5baa1efb4e1ed4f0fe9a6803167c93
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54099
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Daisuke Nojiri 2021-05-12 12:50:41 -07:00 committed by Patrick Georgi
parent c11d4fb0b0
commit fc7900b6b9
1 changed files with 12 additions and 7 deletions
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19
src/security/vboot/vboot_logic.c
View File

@ -212,15 +212,18 @@ static uint32_t extend_pcrs(struct vb2_context *ctx)
vboot_extend_pcr(ctx, 1, HWID_DIGEST_PCR);
}
#define EC_EFS_BOOT_MODE_NORMAL 0x00
#define EC_EFS_BOOT_MODE_NO_BOOT 0x01
#define EC_EFS_BOOT_MODE_TRUSTED_RO 0x00
#define EC_EFS_BOOT_MODE_UNTRUSTED_RO 0x01
#define EC_EFS_BOOT_MODE_VERIFIED_RW 0x02
static const char *get_boot_mode_string(uint8_t boot_mode)
{
if (boot_mode == EC_EFS_BOOT_MODE_NORMAL)
return "NORMAL";
else if (boot_mode == EC_EFS_BOOT_MODE_NO_BOOT)
return "NO_BOOT";
if (boot_mode == EC_EFS_BOOT_MODE_TRUSTED_RO)
return "TRUSTED_RO";
else if (boot_mode == EC_EFS_BOOT_MODE_UNTRUSTED_RO)
return "UNTRUSTED_RO";
else if (boot_mode == EC_EFS_BOOT_MODE_VERIFIED_RW)
return "VERIFIED_RW";
else
return "UNDEFINED";
}
@ -253,8 +256,10 @@ static void check_boot_mode(struct vb2_context *ctx)
printk(BIOS_INFO, "Cr50 says boot_mode is %s(0x%02x).\n",
get_boot_mode_string(boot_mode), boot_mode);
if (boot_mode == EC_EFS_BOOT_MODE_NO_BOOT)
if (boot_mode == EC_EFS_BOOT_MODE_UNTRUSTED_RO)
ctx->flags |= VB2_CONTEXT_NO_BOOT;
else if (boot_mode == EC_EFS_BOOT_MODE_TRUSTED_RO)
ctx->flags |= VB2_CONTEXT_EC_TRUSTED;
}
/**