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Set NODELETE flag when opening already open objects with RTLD_NODELETE

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The DF_1_NODELETE flag is set too late when opening a DSO, due to
which, if a DSO is already open, subsequently opening it with
RTLD_NODELETE fails to set the DF_1_NODELETE flag.  This patch fixes
this by setting the flag immediately after bumping the opencount.

Verified on x86_64.

	[BZ #18676]
	* elf/tst-nodelete-opened.c: New test case.
	* elf/tst-nodelete-opened-lib.c: New test case module.
	* elf/Makefile (tests, modules-names): Use them.
	* elf/dl-open.c (dl_open_worker): Set DF_1_NODELETE flag
	early.
This commit is contained in:
Siddhesh Poyarekar
2015-07-16 08:53:28 +05:30
parent c59f721c73
commit b632bdd3f7
6 changed files with 106 additions and 8 deletions
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19
elf/tst-nodelete-opened-lib.c Normal file
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/* Verify that objects opened with RTLD_NODELETE are not unloaded - the DSO.
Copyright (C) 2015 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/>. */
int foo_var = 42;