mirror of
https://sourceware.org/git/glibc.git
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5a82c74822
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
/* Copyright (C) 2000-2019 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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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/sysmacros.h>
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/* Try to get a machine dependent instruction which will make the
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program crash. This is used in case everything else fails. */
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#include <abort-instr.h>
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#ifndef ABORT_INSTRUCTION
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/* No such instruction is available. */
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# define ABORT_INSTRUCTION
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#endif
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#include <device-nrs.h>
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#include <not-cancel.h>
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/* Should other OSes (e.g., Hurd) have different versions which can
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be written in a better way? */
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static void
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check_one_fd (int fd, int mode)
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{
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if (__builtin_expect (__fcntl64_nocancel (fd, F_GETFD), 0) == -1
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&& errno == EBADF)
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{
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const char *name;
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dev_t dev;
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/* For writable descriptors we use /dev/full. */
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if ((mode & O_ACCMODE) == O_WRONLY)
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{
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name = _PATH_DEV "full";
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dev = __gnu_dev_makedev (DEV_FULL_MAJOR, DEV_FULL_MINOR);
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}
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else
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{
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name = _PATH_DEVNULL;
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dev = __gnu_dev_makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR);
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}
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/* Something is wrong with this descriptor, it's probably not
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opened. Open /dev/null so that the SUID program we are
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about to start does not accidentally use this descriptor. */
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int nullfd = __open_nocancel (name, mode, 0);
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/* We are very paranoid here. With all means we try to ensure
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that we are actually opening the /dev/null device and nothing
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else.
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Note that the following code assumes that STDIN_FILENO,
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STDOUT_FILENO, STDERR_FILENO are the three lowest file
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decsriptor numbers, in this order. */
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struct stat64 st;
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if (__builtin_expect (nullfd != fd, 0)
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|| __builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) != 0
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|| __builtin_expect (S_ISCHR (st.st_mode), 1) == 0
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|| st.st_rdev != dev)
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/* We cannot even give an error message here since it would
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run into the same problems. */
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while (1)
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/* Try for ever and ever. */
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ABORT_INSTRUCTION;
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}
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}
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void
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__libc_check_standard_fds (void)
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{
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/* Check all three standard file descriptors. The O_NOFOLLOW flag
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is really paranoid but some people actually are. If /dev/null
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should happen to be a symlink to somewhere else and not the
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device commonly known as "/dev/null" we bail out. */
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check_one_fd (STDIN_FILENO, O_WRONLY | O_NOFOLLOW);
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check_one_fd (STDOUT_FILENO, O_RDONLY | O_NOFOLLOW);
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check_one_fd (STDERR_FILENO, O_RDONLY | O_NOFOLLOW);
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}
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