a289ea09ea
If the process is in a bad state, we used to print backtraces in
many cases. This is problematic because doing so could involve
a lot of work, like loading libgcc_s using the dynamic linker,
and this could itself be targeted by exploit writers. For example,
if the crashing process was forked from a long-lived process, the
addresses in the error message could be used to bypass ASLR.
Commit ed421fca42 ("Avoid backtrace from
__stack_chk_fail [BZ #12189]"), backtraces where no longer printed
because backtrace_and_maps was always called with do_abort == 1.
Rather than fixing this logic error, this change removes the backtrace
functionality from the sources. With the prevalence of external crash
handlers, it does not appear to be particularly useful. The crash
handler may also destroy useful information for debugging.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
36 lines
1.3 KiB
C
36 lines
1.3 KiB
C
/* Catastrophic failure reports. Linux version.
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Copyright (C) 1993-2019 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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#include <errno.h>
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#include <sys/uio.h>
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static bool
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writev_for_fatal (int fd, const struct iovec *iov, size_t niov, size_t total)
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{
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INTERNAL_SYSCALL_DECL (err);
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ssize_t cnt;
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do
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cnt = INTERNAL_SYSCALL (writev, err, 3, fd, iov, niov);
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while (INTERNAL_SYSCALL_ERROR_P (cnt, err)
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&& INTERNAL_SYSCALL_ERRNO (cnt, err) == EINTR);
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return cnt == total;
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}
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#define WRITEV_FOR_FATAL writev_for_fatal
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#include <sysdeps/posix/libc_fatal.c>
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