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glibc/elf/tst-dlopen-nodelete-reloc.h

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dlopen: Fix issues related to NODELETE handling and relocations The assumption behind the assert in activate_nodelete was wrong: Inconsistency detected by ld.so: dl-open.c: 459: activate_nodelete: Assertion `!imap->l_init_called || imap->l_type != lt_loaded' failed! (edit) It can happen that an already-loaded object that is in the local scope is promoted to NODELETE status, via binding to a unique symbol. Similarly, it is possible that such NODELETE promotion occurs to an already-loaded object from the global scope. This is why the loop in activate_nodelete has to cover all objects in the namespace of the new object. In do_lookup_unique, it could happen that the NODELETE status of an already-loaded object was overwritten with a pending NODELETE status. As a result, if dlopen fails, this could cause a loss of the NODELETE status of the affected object, eventually resulting in an incorrect unload. Fixes commit f63b73814f74032c0e5d0a83300e3d864ef905e5 ("Remove all loaded objects if dlopen fails, ignoring NODELETE [BZ #20839]").
2019-12-13 09:18:24 +00:00
/* Template to produce unique symbols.
Update copyright dates with scripts/update-copyrights.
2020-01-01 00:14:33 +00:00
Copyright (C) 2019-2020 Free Software Foundation, Inc.
dlopen: Fix issues related to NODELETE handling and relocations The assumption behind the assert in activate_nodelete was wrong: Inconsistency detected by ld.so: dl-open.c: 459: activate_nodelete: Assertion `!imap->l_init_called || imap->l_type != lt_loaded' failed! (edit) It can happen that an already-loaded object that is in the local scope is promoted to NODELETE status, via binding to a unique symbol. Similarly, it is possible that such NODELETE promotion occurs to an already-loaded object from the global scope. This is why the loop in activate_nodelete has to cover all objects in the namespace of the new object. In do_lookup_unique, it could happen that the NODELETE status of an already-loaded object was overwritten with a pending NODELETE status. As a result, if dlopen fails, this could cause a loss of the NODELETE status of the affected object, eventually resulting in an incorrect unload. Fixes commit f63b73814f74032c0e5d0a83300e3d864ef905e5 ("Remove all loaded objects if dlopen fails, ignoring NODELETE [BZ #20839]").
2019-12-13 09:18:24 +00:00
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
<https://www.gnu.org/licenses/>. */
/* This template produces a unique symbol definition for an explicit
template instantiation (without also incorporating a reference),
and an extern template declaration can be used to reference that
symbol from another object. The modid parameter is just a
placeholder to create different symbols (because it affects the
name mangling of the static value member). By convention, it
should match the number of the module that contains the
definition. */
template <int modid>
struct unique_symbol
{
static int value;
};
template <int modid>
int unique_symbol<modid>::value;
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