elf: Ignore LD_LIBRARY_PATH and debug env var for setuid for static

It mimics the ld.so behavior.

Checked on x86_64-linux-gnu.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
(cherry picked from commit 5451fa962cd0a90a0e2ec1d8910a559ace02bba0)

Changes:
	Keep EXTRA_UNSECURE_ENVVARS support.
	Use __rawmemchr instead of strchr.
	Keep LD_PROFILE_OUTPUT support.
	Make tunables support optional via HAVE_TUNABLES.

diff --git a/elf/dl-support.c b/elf/dl-support.c
index 09079c124d4228916a70ba3499227a71db52438b..c2baed694dfeda026ee69e727bb35e891a5a31c4 100644 (file)
--- a/elf/dl-support.c
+++ b/elf/dl-support.c
@@ -272,8 +272,6 @@ _dl_non_dynamic_init (void)
   _dl_main_map.l_phdr = GL(dl_phdr);
   _dl_main_map.l_phnum = GL(dl_phnum);
 
-  _dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1;
-
   /* Set up the data structures for the system-supplied DSO early,
      so they can influence _dl_init_paths.  */
   setup_vdso (NULL, NULL);
@@ -281,27 +279,6 @@ _dl_non_dynamic_init (void)
   /* With vDSO setup we can initialize the function pointers.  */
   setup_vdso_pointers ();
 
-  /* Initialize the data structures for the search paths for shared
-     objects.  */
-  _dl_init_paths (getenv ("LD_LIBRARY_PATH"), "LD_LIBRARY_PATH",
-                 /* No glibc-hwcaps selection support in statically
-                    linked binaries.  */
-                 NULL, NULL);
-
-  /* Remember the last search directory added at startup.  */
-  _dl_init_all_dirs = GL(dl_all_dirs);
-
-  _dl_lazy = *(getenv ("LD_BIND_NOW") ?: "") == '\0';
-
-  _dl_bind_not = *(getenv ("LD_BIND_NOT") ?: "") != '\0';
-
-  _dl_dynamic_weak = *(getenv ("LD_DYNAMIC_WEAK") ?: "") == '\0';
-
-  _dl_profile_output = getenv ("LD_PROFILE_OUTPUT");
-  if (_dl_profile_output == NULL || _dl_profile_output[0] == '\0')
-    _dl_profile_output
-      = &"/var/tmp\0/var/profile"[__libc_enable_secure ? 9 : 0];
-
   if (__libc_enable_secure)
     {
       static const char unsecure_envvars[] =
@@ -324,6 +301,29 @@ _dl_non_dynamic_init (void)
 #endif
     }
 
+  _dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1;
+
+  /* Initialize the data structures for the search paths for shared
+     objects.  */
+  _dl_init_paths (getenv ("LD_LIBRARY_PATH"), "LD_LIBRARY_PATH",
+                 /* No glibc-hwcaps selection support in statically
+                    linked binaries.  */
+                 NULL, NULL);
+
+  /* Remember the last search directory added at startup.  */
+  _dl_init_all_dirs = GL(dl_all_dirs);
+
+  _dl_lazy = *(getenv ("LD_BIND_NOW") ?: "") == '\0';
+
+  _dl_bind_not = *(getenv ("LD_BIND_NOT") ?: "") != '\0';
+
+  _dl_dynamic_weak = *(getenv ("LD_DYNAMIC_WEAK") ?: "") == '\0';
+
+  _dl_profile_output = getenv ("LD_PROFILE_OUTPUT");
+  if (_dl_profile_output == NULL || _dl_profile_output[0] == '\0')
+    _dl_profile_output
+      = &"/var/tmp\0/var/profile"[__libc_enable_secure ? 9 : 0];
+
 #ifdef DL_PLATFORM_INIT
   DL_PLATFORM_INIT;
 #endif