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authorFlorian Weimer <fweimer@redhat.com>2016-11-30 15:59:57 +0100
committerFlorian Weimer <fweimer@redhat.com>2016-11-30 15:59:57 +0100
commit9e78f6f6e7134a5f299cc8de77370218f8019237 (patch)
tree04aa339daf9901b8fc1851353c697528659e7afe /elf/tst-latepthreadmod.c
parent705a79f82560ff6472cebed86aa5db04cdea3bce (diff)
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Implement _dl_catch_error, _dl_signal_error in libc.so [BZ #16628]
This change moves the main implementation of _dl_catch_error, _dl_signal_error to libc.so, where TLS variables can be used directly. This removes a writable function pointer from the rtld_global variable. For use during initial relocation, minimal implementations of these functions are provided in ld.so. These are eventually interposed by the libc.so implementations. This is implemented by compiling elf/dl-error-skeleton.c twice, via elf/dl-error.c and elf/dl-error-minimal.c. As a side effect of this change, the static version of dl-error.c no longer includes support for the _dl_signal_cerror/_dl_receive_error mechanism because it is only used in ld.so.
Diffstat (limited to 'elf/tst-latepthreadmod.c')
-rw-r--r--elf/tst-latepthreadmod.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/elf/tst-latepthreadmod.c b/elf/tst-latepthreadmod.c
new file mode 100644
index 0000000..ce81206
--- /dev/null
+++ b/elf/tst-latepthreadmod.c
@@ -0,0 +1,33 @@
+/* DSO which links against libpthread and triggers a lazy binding.
+ Copyright (C) 2016 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
+ <http://www.gnu.org/licenses/>. */
+
+/* This file is compiled into a DSO which loads libpthread, but fails
+ the dynamic linker afterwards. */
+
+#include <pthread.h>
+
+/* Link in libpthread. */
+void *pthread_create_ptr = &pthread_create;
+
+int this_function_is_not_defined (void);
+
+int
+trigger_dynlink_failure (void)
+{
+ return this_function_is_not_defined ();
+}