rtld: Account static TLS surplus for audit modules

The new static TLS surplus size computation is

  surplus_tls = 192 * (nns-1) + 144 * nns + 512

where nns is controlled via the rtld.nns tunable. This commit
accounts audit modules too so nns = rtld.nns + audit modules.

rtld.nns should only include the namespaces required by the
application, namespaces for audit modules are accounted on top
of that so audit modules don't use up the static TLS that is
reserved for the application. This allows loading many audit
modules without tuning rtld.nns or using up static TLS, and it
fixes

FAIL: elf/tst-auditmany

Note that DL_NNS is currently a hard upper limit for nns, and
if rtld.nns + audit modules go over the limit that's a fatal
error. By default rtld.nns is 4 which allows 12 audit modules.

Counting the audit modules is based on existing audit string
parsing code, we cannot use GLRO(dl_naudit) before the modules
are actually loaded.

1 files changed, 3 insertions, 2 deletions

diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 3b0c6d9620..eb3ef5bb28 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -1106,8 +1106,9 @@ extern size_t _dl_count_modids (void) attribute_hidden;
 /* Calculate offset of the TLS blocks in the static TLS block.  */
 extern void _dl_determine_tlsoffset (void) attribute_hidden;
 
-/* Calculate the size of the static TLS surplus.  */
-void _dl_tls_static_surplus_init (void) attribute_hidden;
+/* Calculate the size of the static TLS surplus, when the given
+   number of audit modules are loaded.  */
+void _dl_tls_static_surplus_init (size_t naudit) attribute_hidden;
 
 #ifndef SHARED
 /* Set up the TCB for statically linked applications.  This is called