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/* Stack executability handling for GNU dynamic linker. Hurd version.
Copyright (C) 2004-2021 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; if not, see
<https://www.gnu.org/licenses/>. */
#include <ldsodefs.h>
#include <hurdstartup.h>
#include <errno.h>
extern struct hurd_startup_data *_dl_hurd_data attribute_hidden;
/* There is no portable way to know the bounds of the initial thread's stack
so as to mprotect it. */
int
_dl_make_stack_executable (void **stack_endp)
{
/* Challenge the caller. */
if (__builtin_expect (*stack_endp != __libc_stack_end, 0))
return EPERM;
*stack_endp = NULL;
#if IS_IN (rtld)
if (__mprotect ((void *)_dl_hurd_data->stack_base, _dl_hurd_data->stack_size,
PROT_READ|PROT_WRITE|PROT_EXEC) != 0)
return errno;
/* Remember that we changed the permission. */
GL(dl_stack_flags) |= PF_X;
return 0;
#else
/* We don't bother to implement this for static linking. */
return ENOSYS;
#endif
}
rtld_hidden_def (_dl_make_stack_executable)
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