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08f600749e
* include/sys/socket.h: Declare __libc_sa_len_internal and define SA_LEN macro to use it if not NOT_IN_libc. * sysdeps/unix/sysv/linux/sa_len.c: Use INTDEF for __libc_sa_len. * include/fcntl.h: Declare __open_internal and define __open and __libc_open macros if not NOT_IN_libc. * sysdeps/generic/open.c: Use INTDEF for __open. * sysdeps/mach/hurd/open.c: Likewise. * sysdeps/unix/sysv/aix/open.c: Likewise. * sysdeps/unix/syscalls.list: Add __open_internal alias. * sysdeps/generic/check_fds.c: Make sure newly opened file descriptor has correct number. * include/fcntl.h: Define __libc_fcntl macro if not NOT_IN_libc. * sysdeps/mach/hurd/fcntl.c: Undefine __libc_fcntl as well. * sysdeps/unix/sysv/aix/fcntl.c: Likewise. * sysdeps/unix/sysv/linux/i386/fcntl.c: Likewise. * include/wctype.h: Declare __iswalpha_l_internal, __iswdigit_l_internal, __iswspace_l_internal, __iswxdigit_l_internal, and __iswctype_internal. Define __iswalpha_l, __iswctype, __iswdigit_l, __iswspace_l, and __iswxdigit_l macros if not NOT_IN_libc. * wctype/iswctype.c: Use INTDEF for __iswctype. * wctype/wcfuncs_l.c: Use INTDEF for all __iswXXX_l.
89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
/* Copyright (C) 2000, 2002 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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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/* 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 (__libc_fcntl (fd, F_GETFD), 0) == -1
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&& errno == EBADF)
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{
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struct stat64 st;
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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 accidently use this descriptor. */
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int nullfd = __libc_open (_PATH_DEVNULL, mode);
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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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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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#if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR
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|| st.st_rdev != makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR)
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#endif
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)
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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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/* This 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 device
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commonly known as "/dev/null" we bail out. We can detect this with
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the O_NOFOLLOW flag for open() but only on some system. */
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#ifndef O_NOFOLLOW
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# define O_NOFOLLOW 0
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#endif
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/* Check all three standard file descriptors. */
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check_one_fd (STDIN_FILENO, O_RDONLY | O_NOFOLLOW);
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check_one_fd (STDOUT_FILENO, O_RDWR | O_NOFOLLOW);
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check_one_fd (STDERR_FILENO, O_RDWR | O_NOFOLLOW);
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}
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