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12ef66c411
As per https://gcc.gnu.org/ml/gcc-patches/2017-09/msg01220.html ia64 defaults to non-executable stacks in the Linux kernel (furthermore, the use of function descriptors means that trampolines for nested function pointers never need an executable stack). glibc however defines DEFAULT_STACK_PERMS to include PF_X for that architecture, meaning (a) elf/check-execstack fails and (b) (from code inspection, not tested, but this is why I think this is a user-visible bug) thread stacks are unnecessarily mapped with execute permission. This patch fixes the DEFAULT_STACK_PERMS definition in question. Tested (compilation only) with build-many-glibcs.py for ia64. This fixes the check-execstack failure. [BZ #22156] * sysdeps/ia64/stackinfo.h (DEFAULT_STACK_PERMS): Likewise.
34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
/* Copyright (C) 2001-2017 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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<http://www.gnu.org/licenses/>. */
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/* This file contains a bit of information about the stack allocation
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of the processor. */
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#ifndef _STACKINFO_H
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#define _STACKINFO_H 1
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#include <elf.h>
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/* On IA-64 the stack grows down. The register stack is of no concern
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here. */
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#define _STACK_GROWS_DOWN 1
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/* Default to a non-executable stack. */
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#define DEFAULT_STACK_PERMS (PF_R|PF_W)
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#endif /* stackinfo.h */
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