[glibc/release/2.34/master] elf: Add _dl_audit_objsearch

[glibc/release/2.34/master] elf: Add _dl_audit_objsearch

[Carlos O'Donell]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ec0fc2a15358dc5f7191f9994f04b1385d14377d

commit ec0fc2a15358dc5f7191f9994f04b1385d14377d
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Tue Jul 20 13:47:36 2021 -0300

    elf: Add _dl_audit_objsearch
    
    It consolidates the code required to call la_objsearch 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 c91008d3490e4e3ce29520068405f081f0d368ca)

Diff:
---
 elf/dl-audit.c             | 22 +++++++++++++++
 elf/dl-load.c              | 67 +++++++++++++---------------------------------
 sysdeps/generic/ldsodefs.h |  7 +++++
 3 files changed, 47 insertions(+), 49 deletions(-)

diff --git a/elf/dl-audit.c b/elf/dl-audit.c
index 74b87f4b39..5682427220 100644
--- a/elf/dl-audit.c
+++ b/elf/dl-audit.c
@@ -44,6 +44,28 @@ _dl_audit_activity_nsid (Lmid_t nsid, int action)
   _dl_audit_activity_map (head, action);
 }
 
+const char *
+_dl_audit_objsearch (const char *name, struct link_map *l, unsigned int code)
+{
+  if (l == NULL || l->l_auditing || code == 0)
+    return name;
+
+  struct audit_ifaces *afct = GLRO(dl_audit);
+  for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
+    {
+      if (afct->objsearch != NULL)
+	{
+	  struct auditstate *state = link_map_audit_state (l, cnt);
+	  name = afct->objsearch (name, &state->cookie, code);
+	  if (name == NULL)
+	    return NULL;
+	}
+      afct = afct->next;
+   }
+
+  return name;
+}
+
 void
 _dl_audit_objopen (struct link_map *l, Lmid_t nsid)
 {
diff --git a/elf/dl-load.c b/elf/dl-load.c
index baf0a92605..eb6b658b69 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -1596,32 +1596,20 @@ open_verify (const char *name, int fd,
 
 #ifdef SHARED
   /* Give the auditing libraries a chance.  */
-  if (__glibc_unlikely (GLRO(dl_naudit) > 0) && whatcode != 0
-      && loader->l_auditing == 0)
+  if (__glibc_unlikely (GLRO(dl_naudit) > 0))
     {
       const char *original_name = name;
-      struct audit_ifaces *afct = GLRO(dl_audit);
-      for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
-	{
-	  if (afct->objsearch != NULL)
-	    {
-	      struct auditstate *state = link_map_audit_state (loader, cnt);
-	      name = afct->objsearch (name, &state->cookie, whatcode);
-	      if (name == NULL)
-		/* Ignore the path.  */
-		return -1;
-	    }
-
-	  afct = afct->next;
-	}
+      name = _dl_audit_objsearch (name, loader, whatcode);
+      if (name == NULL)
+	return -1;
 
       if (fd != -1 && name != original_name && strcmp (name, original_name))
-        {
-          /* An audit library changed what we're supposed to open,
-             so FD no longer matches it.  */
-          __close_nocancel (fd);
-          fd = -1;
-        }
+	{
+	  /* An audit library changed what we're supposed to open,
+	     so FD no longer matches it.  */
+	  __close_nocancel (fd);
+	  fd = -1;
+	}
     }
 #endif
 
@@ -2060,36 +2048,17 @@ _dl_map_object (struct link_map *loader, const char *name,
 #ifdef SHARED
   /* Give the auditing libraries a chance to change the name before we
      try anything.  */
-  if (__glibc_unlikely (GLRO(dl_naudit) > 0)
-      && (loader == NULL || loader->l_auditing == 0))
+  if (__glibc_unlikely (GLRO(dl_naudit) > 0))
     {
-      struct audit_ifaces *afct = GLRO(dl_audit);
-      for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
+      const char *before = name;
+      name = _dl_audit_objsearch (name, loader, LA_SER_ORIG);
+      if (name == NULL)
 	{
-	  if (afct->objsearch != NULL)
-	    {
-	      const char *before = name;
-	      struct auditstate *state = link_map_audit_state (loader, cnt);
-	      name = afct->objsearch (name, &state->cookie, LA_SER_ORIG);
-	      if (name == NULL)
-		{
-		  /* Do not try anything further.  */
-		  fd = -1;
-		  goto no_file;
-		}
-	      if (before != name && strcmp (before, name) != 0)
-		{
-		  if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_FILES))
-		    _dl_debug_printf ("audit changed filename %s -> %s\n",
-				      before, name);
-
-		  if (origname == NULL)
-		    origname = before;
-		}
-	    }
-
-	  afct = afct->next;
+	  fd = -1;
+	  goto no_file;
 	}
+      if (before != name && strcmp (before, name) != 0)
+	origname = before;
     }
 #endif
 
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 3ae287cb72..9c3e92b9df 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -1361,6 +1361,13 @@ link_map_audit_state (struct link_map *l, size_t index)
     }
 }
 
+/* Call the la_objsearch from the audit modules from the link map L.  If
+   ORIGNAME is non NULL, it is updated with the revious name prior calling
+   la_objsearch.  */
+const char *_dl_audit_objsearch (const char *name, struct link_map *l,
+				 unsigned int code)
+   attribute_hidden;
+
 /* Call the la_activity from the audit modules from the link map L and issues
    the ACTION argument.  */
 void _dl_audit_activity_map (struct link_map *l, int action)