101 lines
3.6 KiB
C
101 lines
3.6 KiB
C
/****************************************************************************
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* sched/group/group_setuid.c
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*
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* Copyright (C) 2019 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.net>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sched/sched.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: setuid
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*
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* Description:
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* The setuid() function sets the real user ID, effective user ID, and the
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* saved set-user-ID of the calling process to uid, given appropriate
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* privileges.
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*
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* Input Parameters:
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* uid - User identity to set the various process's user ID attributes to.
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*
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* Returned Value:
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* Zero if successful and -1 in case of failure, in which case errno is set
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* to one of he following values:
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*
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* EINVAL - The value of the uid argument is invalid and not supported by
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* the implementation.
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* EPERM - The process does not have appropriate privileges and uid does
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* not match the real user ID or the saved set-user-ID.
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*
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****************************************************************************/
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int setuid(uid_t uid)
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{
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FAR struct tcb_s *rtcb;
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FAR struct task_group_s *rgroup;
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/* Verify that the UID is in the valid range of 0 through INT16_MAX.
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* OpenGroup.org does not specify a UID_MAX or UID_MIN. Instead we use a
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* priori knowledge that uid_t is type int16_t.
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*/
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if ((uint16_t)uid > INT16_MAX)
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{
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set_errno(EINVAL);
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return ERROR;
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}
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/* Get the currently executing thread's task group. */
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rtcb = this_task();
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rgroup = rtcb->group;
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/* Set the task group's group identity. */
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DEBUGASSERT(rgroup != NULL);
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rgroup->tg_uid = uid;
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return OK;
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}
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