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e0dbb48105
* sysdeps/unix/sysv/linux/i386/setgroups.c (setgroups): Avoid comparison with limit if we can rely on the syscall being available.
88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/* Copyright (C) 1997, 1998, 2000, 2002, 2004 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 <grp.h>
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#include <unistd.h>
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#include <sys/types.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_setgroups32
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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_setgroups32 */
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/* Set the group set for the current user to GROUPS (N of them). For
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Linux we must convert the array of groups into the format that the
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kernel expects. */
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int
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setgroups (size_t n, const gid_t *groups)
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{
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#if __ASSUME_32BITUIDS > 0
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return INLINE_SYSCALL (setgroups32, 2, n, CHECK_N (groups, n));
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#else
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if (n > (size_t) __sysconf (_SC_NGROUPS_MAX))
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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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else
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{
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size_t i;
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__kernel_gid_t kernel_groups[n];
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# ifdef __NR_setgroups32
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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 (setgroups32, 2, n, CHECK_N (groups, n));
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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_setgroups32 */
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for (i = 0; i < n; i++)
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{
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kernel_groups[i] = (__ptrvalue (groups))[i];
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if (groups[i] != (gid_t) ((__kernel_gid_t) groups[i]))
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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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}
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return INLINE_SYSCALL (setgroups, 2, n, CHECK_N (kernel_groups, n));
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}
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#endif
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}
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libc_hidden_def (setgroups)
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