linuxkm/linuxkm_wc_port.h: when HAVE_LINUXKM_PIE_SUPPORT, map

  WOLFSSL_TEXT_SEGMENT_CANONICALIZER() to wc_linuxkm_normalize_relocations(), and
  define WOLFSSL_TEXT_SEGMENT_CANONICALIZER_BUFSIZ to 8192.

linuxkm/module_hooks.c: in wc_linuxkm_normalize_relocations(), add checks for
  out-of-order offsets.

Author: douzzer

linuxkm/linuxkm_wc_port.h

@@ -665,6 +665,13 @@
     #endif
 
     #ifdef HAVE_LINUXKM_PIE_SUPPORT
+
+    #ifndef WOLFSSL_TEXT_SEGMENT_CANONICALIZER
+        #define WOLFSSL_TEXT_SEGMENT_CANONICALIZER(text_in, text_in_len, text_out, cur_index_p) \
+            wc_linuxkm_normalize_relocations(text_in, text_in_len, text_out, cur_index_p)
+        #define WOLFSSL_TEXT_SEGMENT_CANONICALIZER_BUFSIZ 8192
+    #endif
+
     extern const u8
         __wc_text_start[],
         __wc_text_end[],

linuxkm/module_hooks.c

@@ -719,6 +719,7 @@ ssize_t wc_linuxkm_normalize_relocations(
 {
     ssize_t i = -1;
     size_t text_in_offset;
+    size_t last_reloc; /* for error-checking order in wc_linuxkm_pie_reloc_tab[] */
 #ifdef DEBUG_LINUXKM_PIE_SUPPORT
     int n_text_r = 0, n_rodata_r = 0, n_rwdata_r = 0, n_bss_r = 0, n_other_r = 0;
 #endif
@@ -746,14 +747,21 @@ ssize_t wc_linuxkm_normalize_relocations(
     memcpy(text_out, text_in, text_in_len);
     WC_SANITIZE_ENABLE();
 
-    for (;
+    for (last_reloc = wc_linuxkm_pie_reloc_tab[i > 0 ? i-1 : 0];
          (size_t)i < wc_linuxkm_pie_reloc_tab_length - 1;
          ++i)
     {
         size_t next_reloc = wc_linuxkm_pie_reloc_tab[i];
         int reloc_buf;
         uintptr_t abs_ptr;
 
+        if (last_reloc > next_reloc) {
+            pr_err("BUG: out-of-order offset found at wc_linuxkm_pie_reloc_tab[%zd]: %zu > %zu\n",
+                   i, last_reloc, next_reloc);
+            return -1;
+        }
+        last_reloc = next_reloc;
+
         next_reloc -= text_in_offset;
 
         if (next_reloc >= text_in_len) {