[src/trunk]: src/lib/libc/tls Determine dynamic binaries by presence of PT_IN...

[joerg <joerg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e9672ef687b8
branches:  trunk
changeset: 320616:e9672ef687b8
user:      joerg <joerg%NetBSD.org@localhost>
date:      Fri Jul 13 19:50:21 2018 +0000

description:
Determine dynamic binaries by presence of PT_INTERP. Static PIE has
_DYNAMIC.

diffstat:

 lib/libc/tls/tls.c |  18 ++++++++++--------
 1 files changed, 10 insertions(+), 8 deletions(-)

diffs (68 lines):

diff -r 3e268d5862d3 -r e9672ef687b8 lib/libc/tls/tls.c
--- a/lib/libc/tls/tls.c        Fri Jul 13 19:49:47 2018 +0000
+++ b/lib/libc/tls/tls.c        Fri Jul 13 19:50:21 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: tls.c,v 1.8 2014/12/14 23:49:17 chs Exp $      */
+/*     $NetBSD: tls.c,v 1.9 2018/07/13 19:50:21 joerg Exp $    */
 
 /*-
  * Copyright (c) 2011 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: tls.c,v 1.8 2014/12/14 23:49:17 chs Exp $");
+__RCSID("$NetBSD: tls.c,v 1.9 2018/07/13 19:50:21 joerg Exp $");
 
 #include "namespace.h"
 
@@ -45,6 +45,7 @@
 #include <sys/mman.h>
 #include <link_elf.h>
 #include <lwp.h>
+#include <stdbool.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
@@ -52,6 +53,7 @@
 
 __dso_hidden void      __libc_static_tls_setup(void);
 
+static bool is_dynamic;
 static const void *tls_initaddr;
 static size_t tls_initsize;
 static size_t tls_size;
@@ -131,8 +133,6 @@
                free(p);
 }
 
-__weakref_visible int rtld_DYNAMIC __weak_reference(_DYNAMIC);
-
 static int __section(".text.startup")
 __libc_static_tls_setup_cb(struct dl_phdr_info *data, size_t len, void *cookie)
 {
@@ -140,6 +140,10 @@
        const Elf_Phdr *phlimit = data->dlpi_phdr + data->dlpi_phnum;
 
        for (; phdr < phlimit; ++phdr) {
+               if (phdr->p_type == PT_INTERP) {
+                       is_dynamic = true;
+                       return -1;
+               }
                if (phdr->p_type != PT_TLS)
                        continue;
                tls_initaddr = (void *)(phdr->p_vaddr + data->dlpi_addr);
@@ -154,11 +158,9 @@
 {
        struct tls_tcb *tcb;
 
-       if (&rtld_DYNAMIC != NULL) {
+       dl_iterate_phdr(__libc_static_tls_setup_cb, NULL);
+       if (is_dynamic)
                return;
-       }
-
-       dl_iterate_phdr(__libc_static_tls_setup_cb, NULL);
 
        tcb = _rtld_tls_allocate();
 #ifdef __HAVE___LWP_SETTCB