pkg/kfuzztest: add pkg/kfuzztest

Add a new package, pkg/kfuzztest, that implements dynamic discovery of
KFuzzTest targets by parsing a vmlinux kernel binary.

Signed-off-by: Ethan Graham <ethangraham@google.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/pkg/kfuzztest/testdata/linker.ld b/pkg/kfuzztest/testdata/linker.ld
new file mode 100644
index 000000000..345c02128
--- /dev/null
+++ b/pkg/kfuzztest/testdata/linker.ld
@@ -0,0 +1,39 @@
+/* Copyright 2025 syzkaller project authors. All rights reserved. */
+/* Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file. */
+
+/* Defines a basic linkage script for building kernel-like KFuzzTest metadata into a binary. */
+PAGE_SIZE = 0x1000;
+
+PHDRS
+{
+    text PT_LOAD FLAGS(5); /* R, X */
+    data PT_LOAD FLAGS(6); /* R, W */
+}
+
+SECTIONS
+{
+    .text : { *(.text) } :text
+
+    .rodata : {
+        *(.rodata*)
+
+        . = ALIGN(PAGE_SIZE);
+        __kfuzztest_targets_start = .;
+        KEEP(*(.kfuzztest_target));
+        __kfuzztest_targets_end = .;
+
+        . = ALIGN(PAGE_SIZE);
+        __kfuzztest_constraints_start = .;
+        KEEP(*(.kfuzztest_constraint));
+        __kfuzztest_constraints_end = .;
+
+        . = ALIGN(PAGE_SIZE);
+        __kfuzztest_annotations_start = .;
+        KEEP(*(.kfuzztest_annotation));
+        __kfuzztest_annotations_end = .;
+
+    } :text
+
+    .data : { *(.data) } :data
+    .bss : { *(.bss) } :data
+}