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/* Resolve conflicts against already prelinked libraries.
Copyright (C) 2001-2021 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; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#include <assert.h>
#include <errno.h>
#include <libintl.h>
#include <stdlib.h>
#include <unistd.h>
#include <ldsodefs.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/types.h>
#include "dynamic-link.h"
/* Used at loading time solely for prelink executable. It is not called
concurrently so it is be safe to defined as static. */
static struct link_map *resolve_conflict_map __attribute__ ((__unused__));
/* This macro is used as a callback from the ELF_DYNAMIC_RELOCATE code. */
#define RESOLVE_MAP(map, scope, ref, version, flags) (*ref = NULL, NULL)
#define RESOLVE(ref, version, flags) (*ref = NULL, 0)
#define RESOLVE_CONFLICT_FIND_MAP(map, r_offset) \
do { \
while ((resolve_conflict_map->l_map_end < (ElfW(Addr)) (r_offset)) \
|| (resolve_conflict_map->l_map_start > (ElfW(Addr)) (r_offset))) \
resolve_conflict_map = resolve_conflict_map->l_next; \
\
(map) = resolve_conflict_map; \
} while (0)
#include "dynamic-link.h"
void
_dl_resolve_conflicts (struct link_map *l, ElfW(Rela) *conflict,
ElfW(Rela) *conflictend)
{
#if ! ELF_MACHINE_NO_RELA
if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_RELOC))
_dl_debug_printf ("\nconflict processing: %s\n", DSO_FILENAME (l->l_name));
{
/* Do the conflict relocation of the object and library GOT and other
data. */
/* Prelinking makes no sense for anything but the main namespace. */
assert (l->l_ns == LM_ID_BASE);
resolve_conflict_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
/* Override these, defined in dynamic-link.h. */
#undef CHECK_STATIC_TLS
#define CHECK_STATIC_TLS(ref_map, sym_map) ((void) 0)
#undef TRY_STATIC_TLS
#define TRY_STATIC_TLS(ref_map, sym_map) (0)
GL(dl_num_cache_relocations) += conflictend - conflict;
for (; conflict < conflictend; ++conflict)
elf_machine_rela (l, NULL, conflict, NULL, NULL,
(void *) conflict->r_offset, 0);
}
#endif
}
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