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glibc defines the stack_t type with the tag struct sigaltstack. This is not permitted by POSIX; sigaltstack is only reserved with file scope in the namespace of ordinary identifiers, not the tag namespace, and in the case where stack_t is obtained from ucontext.h rather than signal.h, it's not reserved with file scope at all. This patch removes the tag accordingly and updates uses in glibc of struct sigaltstack. This is similar to the removal of the "struct siginfo" tag a few years ago: C++ name mangling changes are an unavoidable consequence. A NEWS item is added to note the changed mangling. There is inevitably some risk of breaking builds of anything that relies on the struct sigaltstack name (though the first few hits I looked at from codesearch.debian.net generally seemed to involve code that could use the stack_t name conditionally, so depending on how they determine the conditionals they may work with glibc not defining the struct tag anyway). Tested for x86_64 and x86, and with build-many-glibcs.py. [BZ #21517] * bits/types/stack_t.h (stack_t): Remove struct tag. * sysdeps/unix/sysv/linux/bits/types/stack_t.h (stack_t): Likewise. * sysdeps/unix/sysv/linux/mips/bits/types/stack_t.h (stack_t): Likewise. * debug/segfault.c (install_handler): Use stack_t instead of struct sigaltstack. * hurd/hurd/signal.h (struct hurd_sigstate): Likewise. * hurd/trampoline.c (_hurd_setup_sighandler): Likewise. * include/signal.h (__sigaltstack): Likwise. * signal/sigaltstack.c (__sigaltstack): Likewise. * signal/signal.h (sigaltstack): Likewise. * sysdeps/mach/hurd/i386/signal-defines.sym (SIGALTSTACK__SS_SP__OFFSET): Likewise. (SIGALTSTACK__SS_SIZE__OFFSET): Likewise. (SIGALTSTACK__SS_FLAGS__OFFSET): Likewise. * sysdeps/mach/hurd/sigaltstack.c (__sigaltstack): Likewise. * sysdeps/mach/hurd/sigstack.c (sigstack): Likewise. * sysdeps/unix/sysv/linux/alpha/sys/procfs.h (struct elf_prstatus): Likewise. * sysdeps/unix/sysv/linux/hppa/____longjmp_chk.c (CHECK_SP): Likewise. * sysdeps/unix/sysv/linux/ia64/sys/procfs.h (struct elf_prstatus): Likewise. * sysdeps/unix/sysv/linux/m68k/____longjmp_chk.c (CHECK_SP): Likewise. * sysdeps/unix/sysv/linux/powerpc/sys/procfs.h (struct elf_prstatus): Likewise. * sysdeps/unix/sysv/linux/sh/sys/procfs.h (struct elf_prstatus): Likewise. * sysdeps/unix/sysv/linux/sys/procfs.h (struct elf_prstatus): Likewise.
48 lines
2.1 KiB
C
48 lines
2.1 KiB
C
/* Copyright (C) 2009-2017 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 General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include <stdio.h>
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#include <signal.h>
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#include <sysdep.h>
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#define __longjmp ____longjmp_chk
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#define CHECK_SP(sp) \
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do { \
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register unsigned long this_sp asm ("r30"); \
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/* The stack grows up, therefore frames that were created and then \
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destroyed must all have stack values higher than ours. */ \
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if ((unsigned long) (sp) > this_sp) \
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{ \
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stack_t oss; \
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INTERNAL_SYSCALL_DECL (err); \
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int result = INTERNAL_SYSCALL (sigaltstack, err, 2, NULL, &oss);\
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/* If we aren't using an alternate stack then we have already \
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shown that we are jumping to a frame that doesn't exist so \
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error out. If we are using an alternate stack we must prove \
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that we are jumping *out* of the alternate stack. Note that \
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the check for that is the same as that for _STACK_GROWS_UP \
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as for _STACK_GROWS_DOWN. */ \
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if (!INTERNAL_SYSCALL_ERROR_P (result, err) \
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&& ((oss.ss_flags & SS_ONSTACK) == 0 \
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|| ((unsigned long) oss.ss_sp + oss.ss_size \
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- (unsigned long) (sp)) < oss.ss_size)) \
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__fortify_fail ("longjmp causes uninitialized stack frame"); \
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} \
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} while (0)
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#include <__longjmp.c>
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