diff mbox series

[v7,01/16] elf: Add _dl_audit_objopen

Message ID 20211222132712.523295-2-adhemerval.zanella@linaro.org
State Committed
Commit aee6e90f93e285016b6cd9c8bd00402c19ba271b
Headers show
Series Multiple rtld-audit fixes | expand

Checks

Context Check Description
dj/TryBot-apply_patch success Patch applied to master at the time it was sent

Commit Message

Adhemerval Zanella Dec. 22, 2021, 1:26 p.m. UTC
It consolidates the code required to call la_objopen audit callback.

Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.
---
 elf/Makefile               |  2 +-
 elf/dl-audit.c             | 39 ++++++++++++++++++++++++++++++++++++++
 elf/dl-load.c              | 18 ++----------------
 elf/rtld.c                 | 23 ++--------------------
 sysdeps/generic/ldsodefs.h |  5 +++++
 5 files changed, 49 insertions(+), 38 deletions(-)
 create mode 100644 elf/dl-audit.c

Comments

Florian Weimer Dec. 24, 2021, 11:50 a.m. UTC | #1
* Adhemerval Zanella:

> It consolidates the code required to call la_objopen audit callback.
>
> Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu.
> ---
>  elf/Makefile               |  2 +-
>  elf/dl-audit.c             | 39 ++++++++++++++++++++++++++++++++++++++
>  elf/dl-load.c              | 18 ++----------------
>  elf/rtld.c                 | 23 ++--------------------
>  sysdeps/generic/ldsodefs.h |  5 +++++
>  5 files changed, 49 insertions(+), 38 deletions(-)
>  create mode 100644 elf/dl-audit.c

Looks okay.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

Thanks,
Florian
diff mbox series

Patch

diff --git a/elf/Makefile b/elf/Makefile
index fe42caeb0e..5e4ffeb530 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -68,7 +68,7 @@  elide-routines.os = $(all-dl-routines) dl-support enbl-secure dl-origin \
 rtld-routines	= rtld $(all-dl-routines) dl-sysdep dl-environ dl-minimal \
   dl-error-minimal dl-conflict dl-hwcaps dl-hwcaps_split dl-hwcaps-subdirs \
   dl-usage dl-diagnostics dl-diagnostics-kernel dl-diagnostics-cpu \
-  dl-mutex dl-libc_freeres
+  dl-mutex dl-libc_freeres dl-audit
 all-rtld-routines = $(rtld-routines) $(sysdep-rtld-routines)
 
 CFLAGS-dl-runtime.c += -fexceptions -fasynchronous-unwind-tables
diff --git a/elf/dl-audit.c b/elf/dl-audit.c
new file mode 100644
index 0000000000..4066dfe851
--- /dev/null
+++ b/elf/dl-audit.c
@@ -0,0 +1,39 @@ 
+/* Audit common functions.
+   Copyright (C) 2021 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <ldsodefs.h>
+
+void
+_dl_audit_objopen (struct link_map *l, Lmid_t nsid)
+{
+  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->objopen != NULL)
+	{
+	  struct auditstate *state = link_map_audit_state (l, cnt);
+	  state->bindflags = afct->objopen (l, nsid, &state->cookie);
+	  l->l_audit_any_plt |= state->bindflags != 0;
+	}
+
+      afct = afct->next;
+   }
+}
diff --git a/elf/dl-load.c b/elf/dl-load.c
index 721593135e..57de24491a 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -1521,22 +1521,8 @@  cannot enable executable stack as shared object requires");
 
 #ifdef SHARED
   /* Auditing checkpoint: we have a new object.  */
-  if (__glibc_unlikely (GLRO(dl_naudit) > 0)
-      && !GL(dl_ns)[l->l_ns]._ns_loaded->l_auditing)
-    {
-      struct audit_ifaces *afct = GLRO(dl_audit);
-      for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
-	{
-	  if (afct->objopen != NULL)
-	    {
-	      struct auditstate *state = link_map_audit_state (l, cnt);
-	      state->bindflags = afct->objopen (l, nsid, &state->cookie);
-	      l->l_audit_any_plt |= state->bindflags != 0;
-	    }
-
-	  afct = afct->next;
-	}
-    }
+  if (!GL(dl_ns)[l->l_ns]._ns_loaded->l_auditing)
+    _dl_audit_objopen (l, nsid);
 #endif
 
   return l;
diff --git a/elf/rtld.c b/elf/rtld.c
index 4b09e84b0d..6b8316e8a9 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -1065,25 +1065,6 @@  ERROR: audit interface '%s' requires version %d (maximum supported version %d);
   dlmargs.map->l_auditing = 1;
 }
 
-/* Notify the the audit modules that the object MAP has already been
-   loaded.  */
-static void
-notify_audit_modules_of_loaded_object (struct link_map *map)
-{
-  struct audit_ifaces *afct = GLRO(dl_audit);
-  for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
-    {
-      if (afct->objopen != NULL)
-	{
-	  struct auditstate *state = link_map_audit_state (map, cnt);
-	  state->bindflags = afct->objopen (map, LM_ID_BASE, &state->cookie);
-	  map->l_audit_any_plt |= state->bindflags != 0;
-	}
-
-      afct = afct->next;
-    }
-}
-
 /* Load all audit modules.  */
 static void
 load_audit_modules (struct link_map *main_map, struct audit_list *audit_list)
@@ -1102,8 +1083,8 @@  load_audit_modules (struct link_map *main_map, struct audit_list *audit_list)
      program and the dynamic linker itself).  */
   if (GLRO(dl_naudit) > 0)
     {
-      notify_audit_modules_of_loaded_object (main_map);
-      notify_audit_modules_of_loaded_object (&GL(dl_rtld_map));
+      _dl_audit_objopen (main_map, LM_ID_BASE);
+      _dl_audit_objopen (&GL(dl_rtld_map), LM_ID_BASE);
     }
 }
 
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index c26860430c..c38a89f3d0 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -1395,6 +1395,11 @@  link_map_audit_state (struct link_map *l, size_t index)
       return &base[index];
     }
 }
+
+/* Call the la_objopen from the audit modules for the link_map L on the
+   namespace identification NSID.  */
+void _dl_audit_objopen (struct link_map *l, Lmid_t nsid)
+  attribute_hidden;
 #endif /* SHARED */
 
 #if PTHREAD_IN_LIBC && defined SHARED