From 62c289e44b3394c67cb748b439a8aff242e0e390 Mon Sep 17 00:00:00 2001
From: Stefano Moioli <smxdev4@gmail.com>
Date: Sat, 6 Apr 2024 01:35:57 +0200
Subject: [PATCH] add resolve_libc_imports

---
 xzre.h   | 15 +++++++++++++++
 xzre.lds |  3 +++
 2 files changed, 18 insertions(+)

diff --git a/xzre.h b/xzre.h
index cb2b56c..cb508ce 100644
--- a/xzre.h
+++ b/xzre.h
@@ -23,6 +23,7 @@ typedef uintptr_t uptr;
 #include <openssl/evp.h>
 #include <openssl/rsa.h>
 #include <elf.h>
+#include <link.h>
 
 #define UPTR(x) ((uptr)(x))
 #define PTRADD(a, b) (UPTR(a) + UPTR(b))
@@ -877,5 +878,19 @@ extern BOOL secret_data_append_singleton(
  */
 extern BOOL backdoor_setup(backdoor_setup_params_t *params);
 
+/**
+ * @brief parses the libc ELF from the supplied link map, and resolves its imports
+ * 
+ * @param libc the loaded libc's link map (obtained by traversing r_debug->r_map)
+ * @param libc_info pointer to an ELF context that will be populated with the parsed ELF information
+ * @param imports pointer to libc imports that will be populated with resolved libc function pointers
+ * @return BOOL TRUE if successful, FALSE otherwise
+ */
+extern BOOL resolve_libc_imports(
+	struct link_map *libc,
+	elf_info_t *libc_info,
+	libc_imports_t *imports
+);
+
 #include "util.h"
 #endif
\ No newline at end of file
diff --git a/xzre.lds b/xzre.lds
index c5c8394..a9fc61f 100644
--- a/xzre.lds
+++ b/xzre.lds
@@ -65,5 +65,8 @@ SECTIONS {
 
         "backdoor_setup" = ".";
         *(.text.microlzma_encoder_inia);
+
+        "resolve_libc_imports" = ".";
+        *(.text.lzma_index_buffer_encoda);
     }
 } INSERT AFTER .text;