1 files changed, 39 insertions, 0 deletions
diff --git a/roms/u-boot/lib/libavb/avb_kernel_cmdline_descriptor.c b/roms/u-boot/lib/libavb/avb_kernel_cmdline_descriptor.c
new file mode 100644
index 000000000..fa3fe4537
--- /dev/null
+++ b/roms/u-boot/lib/libavb/avb_kernel_cmdline_descriptor.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ */
+
+#include "avb_kernel_cmdline_descriptor.h"
+#include "avb_util.h"
+
+bool avb_kernel_cmdline_descriptor_validate_and_byteswap(
+    const AvbKernelCmdlineDescriptor* src, AvbKernelCmdlineDescriptor* dest) {
+  uint64_t expected_size;
+
+  avb_memcpy(dest, src, sizeof(AvbKernelCmdlineDescriptor));
+
+  if (!avb_descriptor_validate_and_byteswap((const AvbDescriptor*)src,
+                                            (AvbDescriptor*)dest))
+    return false;
+
+  if (dest->parent_descriptor.tag != AVB_DESCRIPTOR_TAG_KERNEL_CMDLINE) {
+    avb_error("Invalid tag for kernel cmdline descriptor.\n");
+    return false;
+  }
+
+  dest->flags = avb_be32toh(dest->flags);
+  dest->kernel_cmdline_length = avb_be32toh(dest->kernel_cmdline_length);
+
+  /* Check that kernel_cmdline is fully contained. */
+  expected_size = sizeof(AvbKernelCmdlineDescriptor) - sizeof(AvbDescriptor);
+  if (!avb_safe_add_to(&expected_size, dest->kernel_cmdline_length)) {
+    avb_error("Overflow while adding up sizes.\n");
+    return false;
+  }
+  if (expected_size > dest->parent_descriptor.num_bytes_following) {
+    avb_error("Descriptor payload size overflow.\n");
+    return false;
+  }
+
+  return true;
+}