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-rw-r--r--src/security/vboot/secdata_tpm.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/src/security/vboot/secdata_tpm.c b/src/security/vboot/secdata_tpm.c
index d666ae8a5e..37665bc23d 100644
--- a/src/security/vboot/secdata_tpm.c
+++ b/src/security/vboot/secdata_tpm.c
@@ -36,6 +36,8 @@
#include <security/vboot/tpm_common.h>
#include <string.h>
#include <security/tpm/tspi.h>
+#include <security/tpm/tss.h>
+#include <security/tpm/tss/tcg-1.2/tss_structures.h>
#include <vb2_api.h>
#include <console/console.h>
@@ -68,6 +70,26 @@ static uint32_t read_space_firmware(struct vb2_context *ctx)
uint32_t antirollback_read_space_kernel(struct vb2_context *ctx)
{
+ if (!CONFIG(TPM2)) {
+ /*
+ * Before reading the kernel space, verify its permissions. If
+ * the kernel space has the wrong permission, we give up. This
+ * will need to be fixed by the recovery kernel. We will have
+ * to worry about this because at any time (even with PP turned
+ * off) the TPM owner can remove and redefine a PP-protected
+ * space (but not write to it).
+ */
+ uint32_t perms;
+
+ RETURN_ON_FAILURE(tlcl_get_permissions(KERNEL_NV_INDEX,
+ &perms));
+ if (perms != TPM_NV_PER_PPWRITE) {
+ printk(BIOS_ERR,
+ "TPM: invalid secdata_kernel permissions\n");
+ return TPM_E_CORRUPTED_STATE;
+ }
+ }
+
uint8_t size = VB2_SECDATA_KERNEL_MIN_SIZE;
RETURN_ON_FAILURE(tlcl_read(KERNEL_NV_INDEX, ctx->secdata_kernel,