diff mbox series

[RFC,v7,15/20] Suppress audit calls when a (new) namespace is empty

Message ID 20201216132650.22949-16-vivek@collabora.com
State New
Headers show
Series Implementation of RTLD_SHARED for dlmopen | expand

Commit Message

Vivek Das Mohapatra Dec. 16, 2020, 1:26 p.m. UTC 
When preparing an RTLD_SHARED proxy in a new namespace
it is possible for the target namespace to be empty:

This can happen for RTLD_SHARED + LM_ID_NEWLM.

The audit infrastructure should not be invoked at this
point (as there's nothing there to audit yet).
---
 elf/dl-load.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
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Patch

diff --git a/elf/dl-load.c b/elf/dl-load.c
index 68587831fd..9bd4884a88 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -1127,8 +1127,11 @@  _dl_map_object_from_fd (const char *name, const char *origname, int fd,
 	  && __glibc_unlikely (GLRO(dl_naudit) > 0))
 	{
 	  struct link_map *head = GL(dl_ns)[nsid]._ns_loaded;
-	  /* Do not call the functions for any auditing object.  */
-	  if (head->l_auditing == 0)
+	  /* Do not call the functions for any auditing object.
+	     Do not try to call auditing functions if the namespace
+	     is currently empty. This can hapen when opening the first
+	     DSO in a new namespace.  */
+	  if (head && head->l_auditing == 0)
 	    {
 	      struct audit_ifaces *afct = GLRO(dl_audit);
 	      for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)