51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
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/* Stack executability handling for GNU dynamic linker. Hurd version.
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Copyright (C) 2004-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <ldsodefs.h>
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#include <hurdstartup.h>
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#include <errno.h>
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extern struct hurd_startup_data *_dl_hurd_data attribute_hidden;
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/* There is no portable way to know the bounds of the initial thread's stack
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so as to mprotect it. */
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int
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_dl_make_stack_executable (void **stack_endp)
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{
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/* Challenge the caller. */
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if (__builtin_expect (*stack_endp != __libc_stack_end, 0))
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return EPERM;
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*stack_endp = NULL;
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#if IS_IN (rtld)
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if (__mprotect ((void *)_dl_hurd_data->stack_base, _dl_hurd_data->stack_size,
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PROT_READ|PROT_WRITE|PROT_EXEC) != 0)
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return errno;
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/* Remember that we changed the permission. */
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GL(dl_stack_flags) |= PF_X;
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return 0;
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#else
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/* We don't bother to implement this for static linking. */
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return ENOSYS;
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#endif
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}
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rtld_hidden_def (_dl_make_stack_executable)
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