[glibc/codonell/ld-audit] elf: Add _dl_audit_preinit

[Carlos O'Donell <carlos@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e6e3d4cd26cc99fead24265d4461741d8eaeaf32

commit e6e3d4cd26cc99fead24265d4461741d8eaeaf32
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu Jul 22 17:10:57 2021 -0300

    elf: Add _dl_audit_preinit
    
    It consolidates the code required to call la_preinit audit
    callback.
    
    Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.
    
    Reviewed-by: Florian Weimer <fweimer@redhat.com>
    (cherry picked from commit 0b98a8748759e88b58927882a8714109abe0a2d6)

Diff:
---
 csu/libc-start.c           | 23 +++--------------------
 elf/Versions               |  2 +-
 elf/dl-audit.c             | 15 +++++++++++++++
 sysdeps/generic/ldsodefs.h |  3 +++
 4 files changed, 22 insertions(+), 21 deletions(-)

diff --git a/csu/libc-start.c b/csu/libc-start.c
index 0350b006fd..d01e57ea59 100644
--- a/csu/libc-start.c
+++ b/csu/libc-start.c
@@ -377,32 +377,15 @@ LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
     /* This is a current program.  Use the dynamic segment to find
        constructors.  */
     call_init (argc, argv, __environ);
-#else /* !SHARED */
-  call_init (argc, argv, __environ);
-#endif /* SHARED */
 
-#ifdef SHARED
   /* Auditing checkpoint: we have a new object.  */
-  if (__glibc_unlikely (GLRO(dl_naudit) > 0))
-    {
-      struct audit_ifaces *afct = GLRO(dl_audit);
-      struct link_map *head = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
-      for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
-	{
-	  if (afct->preinit != NULL)
-	    afct->preinit (&link_map_audit_state (head, cnt)->cookie);
-
-	  afct = afct->next;
-	}
-    }
-#endif
+  _dl_audit_preinit (GL(dl_ns)[LM_ID_BASE]._ns_loaded);
 
-#ifdef SHARED
   if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS))
     GLRO(dl_debug_printf) ("\ntransferring control: %s\n\n", argv[0]);
-#endif
+#else /* !SHARED */
+  call_init (argc, argv, __environ);
 
-#ifndef SHARED
   _dl_debug_initialize (0, LM_ID_BASE);
 #endif
 
diff --git a/elf/Versions b/elf/Versions
index 164682eaea..bb6697647b 100644
--- a/elf/Versions
+++ b/elf/Versions
@@ -58,7 +58,7 @@ ld {
     _dl_argv; _dl_find_dso_for_object; _dl_get_tls_static_info;
     _dl_deallocate_tls; _dl_make_stack_executable;
     _dl_rtld_di_serinfo; _dl_starting_up; _dl_fatal_printf;
-    _dl_audit_symbind_alt;
+    _dl_audit_symbind_alt; _dl_audit_preinit;
     _rtld_global; _rtld_global_ro;
 
     # Only here for gdb while a better method is developed.
diff --git a/elf/dl-audit.c b/elf/dl-audit.c
index a21530f30b..0b6fac8e48 100644
--- a/elf/dl-audit.c
+++ b/elf/dl-audit.c
@@ -108,6 +108,21 @@ _dl_audit_objclose (struct link_map *l)
     }
 }
 
+void
+_dl_audit_preinit (struct link_map *l)
+{
+  if (__glibc_likely (GLRO(dl_naudit) == 0))
+    return;
+
+  struct audit_ifaces *afct = GLRO(dl_audit);
+  for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
+    {
+      if (afct->preinit != NULL)
+	afct->preinit (&link_map_audit_state (l, cnt)->cookie);
+      afct = afct->next;
+    }
+}
+
 void
 _dl_audit_symbind_alt (struct link_map *l, const ElfW(Sym) *ref, void **value,
 		       lookup_t result)
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index be5f3d16ca..5ccd3b4a38 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -1387,6 +1387,9 @@ void _dl_audit_objopen (struct link_map *l, Lmid_t nsid)
 void _dl_audit_objclose (struct link_map *l)
   attribute_hidden;
 
+/* Call the la_preinit from the audit modules for the link_map L.  */
+void _dl_audit_preinit (struct link_map *l);
+
 /* Call the la_symbind{32,64} from the audit modules for the link_map L.  */
 void _dl_audit_symbind (struct link_map *l, struct reloc_result *reloc_result,
 			const ElfW(Sym) *defsym, DL_FIXUP_VALUE_TYPE *value,