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

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

[Carlos O'Donell]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5e7f59255b86986607519c4cfcdeaedd0aec47f7

commit 5e7f59255b86986607519c4cfcdeaedd0aec47f7
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Tue Jul 20 14:04:51 2021 -0300

    elf: Add _dl_audit_objclose
    
    It consolidates the code required to call la_objclose 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 311c9ee54ea963ff69bd3a2e6981c37e893b4c3e)

Diff:
---
 elf/dl-audit.c             | 21 +++++++++++++++++++++
 elf/dl-close.c             | 20 +-------------------
 elf/dl-fini.c              | 16 +---------------
 sysdeps/generic/ldsodefs.h |  4 ++++
 4 files changed, 27 insertions(+), 34 deletions(-)

diff --git a/elf/dl-audit.c b/elf/dl-audit.c
index 5682427220..cb1c3de93c 100644
--- a/elf/dl-audit.c
+++ b/elf/dl-audit.c
@@ -85,3 +85,24 @@ _dl_audit_objopen (struct link_map *l, Lmid_t nsid)
       afct = afct->next;
    }
 }
+
+void
+_dl_audit_objclose (struct link_map *l)
+{
+  if (__glibc_likely (GLRO(dl_naudit) == 0)
+      || GL(dl_ns)[l->l_ns]._ns_loaded->l_auditing)
+    return;
+
+  struct audit_ifaces *afct = GLRO(dl_audit);
+  for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
+    {
+      if (afct->objclose != NULL)
+	{
+	  struct auditstate *state= link_map_audit_state (l, cnt);
+	  /* Return value is ignored.  */
+	  afct->objclose (&state->cookie);
+	}
+
+      afct = afct->next;
+    }
+}
diff --git a/elf/dl-close.c b/elf/dl-close.c
index 0969a7e69e..b26d0f7e34 100644
--- a/elf/dl-close.c
+++ b/elf/dl-close.c
@@ -266,9 +266,6 @@ _dl_close_worker (struct link_map *map, bool force)
 		 used + (nsid == LM_ID_BASE), true);
 
   /* Call all termination functions at once.  */
-#ifdef SHARED
-  bool do_audit = GLRO(dl_naudit) > 0 && !ns->_ns_loaded->l_auditing;
-#endif
   bool unload_any = false;
   bool scope_mem_left = false;
   unsigned int unload_global = 0;
@@ -302,22 +299,7 @@ _dl_close_worker (struct link_map *map, bool force)
 
 #ifdef SHARED
 	  /* Auditing checkpoint: we remove an object.  */
-	  if (__glibc_unlikely (do_audit))
-	    {
-	      struct audit_ifaces *afct = GLRO(dl_audit);
-	      for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
-		{
-		  if (afct->objclose != NULL)
-		    {
-		      struct auditstate *state
-			= link_map_audit_state (imap, cnt);
-		      /* Return value is ignored.  */
-		      (void) afct->objclose (&state->cookie);
-		    }
-
-		  afct = afct->next;
-		}
-	    }
+	  _dl_audit_objclose (imap);
 #endif
 
 	  /* This object must not be used anymore.  */
diff --git a/elf/dl-fini.c b/elf/dl-fini.c
index 6dbdfe4b3e..814854ed75 100644
--- a/elf/dl-fini.c
+++ b/elf/dl-fini.c
@@ -147,21 +147,7 @@ _dl_fini (void)
 
 #ifdef SHARED
 		  /* Auditing checkpoint: another object closed.  */
-		  if (!do_audit && __builtin_expect (GLRO(dl_naudit) > 0, 0))
-		    {
-		      struct audit_ifaces *afct = GLRO(dl_audit);
-		      for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
-			{
-			  if (afct->objclose != NULL)
-			    {
-			      struct auditstate *state
-				= link_map_audit_state (l, cnt);
-			      /* Return value is ignored.  */
-			      (void) afct->objclose (&state->cookie);
-			    }
-			  afct = afct->next;
-			}
-		    }
+		  _dl_audit_objclose (l);
 #endif
 		}
 
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 9c3e92b9df..ee77c1a2a6 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -1382,6 +1382,10 @@ void _dl_audit_activity_nsid (Lmid_t nsid, int action)
    namespace identification NSID.  */
 void _dl_audit_objopen (struct link_map *l, Lmid_t nsid)
   attribute_hidden;
+
+/* Call the la_objclose from the audit modules for the link_map L.  */
+void _dl_audit_objclose (struct link_map *l)
+  attribute_hidden;
 #endif /* SHARED */
 
 #if PTHREAD_IN_LIBC && defined SHARED