mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-27 12:15:39 +03:00
3b2b88ccee
This patch replaces _dl_stack_flags global variable by _dl_stack_prot_flags. The advantage is that any convertion from p_flags to final used mprotect flags occurs at loading of p_flags. It avoids repeated spurious convertions of _dl_stack_flags, for example in allocate_thread_stack. This modification was suggested in: https://sourceware.org/pipermail/libc-alpha/2025-March/165537.html Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
40 lines
1.4 KiB
C
40 lines
1.4 KiB
C
/* Stack executability handling for GNU dynamic linker.
|
|
Copyright (C) 2025 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 <dl-tunables.h>
|
|
|
|
void
|
|
_dl_handle_execstack_tunable (void)
|
|
{
|
|
switch (TUNABLE_GET (glibc, rtld, execstack, int32_t, NULL))
|
|
{
|
|
case stack_tunable_mode_disable:
|
|
if ((__glibc_unlikely (GL(dl_stack_prot_flags)) & PROT_EXEC))
|
|
_dl_fatal_printf (
|
|
"Fatal glibc error: executable stack is not allowed\n");
|
|
break;
|
|
|
|
case stack_tunable_mode_force:
|
|
if (_dl_make_stack_executable (__libc_stack_end) != 0)
|
|
_dl_fatal_printf (
|
|
"Fatal glibc error: cannot enable executable stack as tunable requires");
|
|
break;
|
|
}
|
|
}
|