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159 lines
4.5 KiB
C
159 lines
4.5 KiB
C
/* Copyright (C) 1998,1999,2000,2002,2003,2004,2006
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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 <unistd.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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#include <shlib-compat.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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/*
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In Linux 2.1.x the chown functions have been changed. A new function lchown
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was introduced. The new chown now follows symlinks - the old chown and the
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new lchown do not follow symlinks.
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The new lchown function has the same number as the old chown had and the
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new chown has a new number. When compiling with headers from Linux > 2.1.8x
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it's impossible to run this libc with older kernels. In these cases libc
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has therefore to route calls to chown to the old chown function.
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*/
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extern int __chown_is_lchown (const char *__file, uid_t __owner,
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gid_t __group);
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extern int __real_chown (const char *__file, uid_t __owner, gid_t __group);
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#if defined __NR_lchown || __ASSUME_LCHOWN_SYSCALL > 0
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/* Running under Linux > 2.1.80. */
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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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__real_chown (const char *file, uid_t owner, gid_t group)
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{
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# if __ASSUME_LCHOWN_SYSCALL == 0
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static int __libc_old_chown;
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int result;
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if (!__libc_old_chown)
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{
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int saved_errno = errno;
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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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int result;
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int saved_errno = errno;
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result = INLINE_SYSCALL (chown32, 3, CHECK_STRING (file), owner, group);
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if (result == 0 || errno != ENOSYS)
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return result;
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__set_errno (saved_errno);
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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) > (uid_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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result = INLINE_SYSCALL (chown, 3, CHECK_STRING (file), owner, group);
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if (result >= 0 || errno != ENOSYS)
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return result;
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__set_errno (saved_errno);
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__libc_old_chown = 1;
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}
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return __lchown (file, owner, group);
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# elif __ASSUME_32BITUIDS
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/* This implies __ASSUME_LCHOWN_SYSCALL. */
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return INLINE_SYSCALL (chown32, 3, CHECK_STRING (file), owner, group);
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# else
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/* !__ASSUME_32BITUIDS && ASSUME_LCHOWN_SYSCALL */
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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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int result;
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int saved_errno = errno;
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result = INLINE_SYSCALL (chown32, 3, CHECK_STRING (file), owner, group);
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if (result == 0 || errno != ENOSYS)
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return result;
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__set_errno (saved_errno);
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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) > (uid_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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return INLINE_SYSCALL (chown, 3, CHECK_STRING (file), owner, group);
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# endif
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}
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#endif
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#if !defined __NR_lchown && __ASSUME_LCHOWN_SYSCALL == 0
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/* Compiling under older kernels. */
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int
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__chown_is_lchown (const char *file, uid_t owner, gid_t group)
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{
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return INLINE_SYSCALL (chown, 3, CHECK_STRING (file), owner, group);
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}
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#elif SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
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/* Compiling for compatibiity. */
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int
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attribute_compat_text_section
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__chown_is_lchown (const char *file, uid_t owner, gid_t group)
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{
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return __lchown (file, owner, group);
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}
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#endif
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
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compat_symbol (libc, __chown_is_lchown, chown, GLIBC_2_0);
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#endif
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#ifdef __NR_lchown
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versioned_symbol (libc, __real_chown, chown, GLIBC_2_1);
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strong_alias (__real_chown, __chown)
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#else
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strong_alias (__chown_is_lchown, __chown_is_lchown21)
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versioned_symbol (libc, __chown_is_lchown21, chown, GLIBC_2_1);
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strong_alias (__chown_is_lchown, __chown)
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#endif
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libc_hidden_def (__chown)
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