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/* AArch64 GCS functions.
Copyright (C) 2024 Free Software Foundation, Inc.
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/>. */
#include <unistd.h>
#include <errno.h>
#include <libintl.h>
#include <ldsodefs.h>
static void
fail (struct link_map *l, const char *program)
{
if (program)
_dl_fatal_printf ("%s: %s: not GCS compatible\n", program, l->l_name);
else
_dl_signal_error (0, l->l_name, "dlopen", N_("not GCS compatible"));
}
static void
check_gcs (struct link_map *l, const char *program)
{
#ifdef SHARED
/* Ignore GCS marking on ld.so: its properties are not processed. */
if (l->l_real == &GL(dl_rtld_map))
return;
#endif
if (!l->l_mach.gcs)
{
if (GLRO(dl_aarch64_gcs_policy) == 2 || !program)
fail (l, program);
if (GLRO(dl_aarch64_gcs_policy) == 1 && program)
GL(dl_aarch64_gcs) = 0;
}
}
/* Apply GCS policy for L and its dependencies. */
void
_dl_gcs_check (struct link_map *l, const char *program)
{
/* GCS is disabled. */
if (GL(dl_aarch64_gcs) == 0)
return;
/* GCS marking is ignored. */
if (GLRO(dl_aarch64_gcs_policy) == 0)
return;
check_gcs (l, program);
for (unsigned int i = 0; i < l->l_searchlist.r_nlist; i++)
check_gcs (l->l_searchlist.r_list[i], program);
}
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