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cb182378d7
[BZ #10609] * sysdeps/unix/sysv/linux/m68k/fchownat.c (fchownat): Fix handling of empty parameters for file names.
129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
/* Copyright (C) 2005, 2006, 2009 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 <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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#include <bp-checks.h>
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#include <linux/posix_types.h>
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#include <kernel-features.h>
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#ifdef __NR_chown32
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# if __ASSUME_32BITUIDS == 0
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/* This variable is shared with all files that need to check for 32bit
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uids. */
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extern int __libc_missing_32bit_uids;
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# endif
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#endif /* __NR_chown32 */
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int
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fchownat (int fd, const char *file, uid_t owner, gid_t group, int flag)
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{
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if (flag & ~AT_SYMLINK_NOFOLLOW)
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{
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__set_errno (EINVAL);
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return -1;
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}
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char *buf = NULL;
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if (fd != AT_FDCWD && file[0] != '/')
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{
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size_t filelen = strlen (file);
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if (__builtin_expect (filelen == 0, 0))
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{
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__set_errno (ENOENT);
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return -1;
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}
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static const char procfd[] = "/proc/self/fd/%d/%s";
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/* Buffer for the path name we are going to use. It consists of
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- the string /proc/self/fd/
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- the file descriptor number
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- the file name provided.
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The final NUL is included in the sizeof. A bit of overhead
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due to the format elements compensates for possible negative
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numbers. */
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size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen;
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buf = alloca (buflen);
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__snprintf (buf, buflen, procfd, fd, file);
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file = buf;
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}
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int result;
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INTERNAL_SYSCALL_DECL (err);
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#if __ASSUME_32BITUIDS > 0
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if (flag & AT_SYMLINK_NOFOLLOW)
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result = INTERNAL_SYSCALL (lchown32, err, 3, CHECK_STRING (file), owner,
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group);
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else
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result = INTERNAL_SYSCALL (chown32, err, 3, CHECK_STRING (file), owner,
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group);
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#else
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# ifdef __NR_chown32
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if (__libc_missing_32bit_uids <= 0)
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{
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if (flag & AT_SYMLINK_NOFOLLOW)
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result = INTERNAL_SYSCALL (lchown32, err, 3, CHECK_STRING (file),
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owner, group);
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else
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result = INTERNAL_SYSCALL (chown32, err, 3, CHECK_STRING (file), owner,
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group);
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if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1))
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return result;
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if (INTERNAL_SYSCALL_ERRNO (result, err) != ENOSYS)
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goto fail;
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__libc_missing_32bit_uids = 1;
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}
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# endif /* __NR_chown32 */
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if (((owner + 1) > (gid_t) ((__kernel_uid_t) -1U))
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|| ((group + 1) > (gid_t) ((__kernel_gid_t) -1U)))
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{
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__set_errno (EINVAL);
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return -1;
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}
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if (flag & AT_SYMLINK_NOFOLLOW)
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result = INTERNAL_SYSCALL (lchown, err, 3, CHECK_STRING (file), owner,
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group);
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else
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result = INTERNAL_SYSCALL (chown, err, 3, CHECK_STRING (file), owner,
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group);
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#endif
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if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 0))
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{
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fail:
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__atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf);
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result = -1;
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}
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return result;
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}
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