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1014c49881
Track supplementary GIDs per task group, wire setgroups/getgroups syscalls when CONFIG_SCHED_NGROUPS > 0, and honor them in DAC checks via nxsched_has_gid(). When NGROUPS is 0, libc provides getgroups/ setgroups stubs. initgroups() fails instead of silently truncating when membership exceeds CONFIG_SCHED_NGROUPS. Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
88 lines
2.8 KiB
C
88 lines
2.8 KiB
C
/****************************************************************************
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* sched/group/group_seteuid.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <assert.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: seteuid
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*
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* Description:
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* The seteuid() function sets the effective user ID of the calling process
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* to uid, given appropriate privileges.
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*
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* Input Parameters:
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* uid - User identity to set the various process's effective user ID
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* 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 effective user ID or the saved set-user-ID.
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*
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****************************************************************************/
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int seteuid(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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/* 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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DEBUGASSERT(rgroup != NULL);
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if (rgroup->tg_euid == 0 ||
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uid == rgroup->tg_uid || uid == rgroup->tg_suid)
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{
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/* Root may set any value; non-root may only set to real or saved. */
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rgroup->tg_euid = uid;
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}
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else
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{
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set_errno(EPERM);
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return ERROR;
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}
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return OK;
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}
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