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cf3781b7f0
Complete the POSIX credential setters for real/effective/saved UID and GID so login and privilege-drop paths can clear saved-root without relying on setreuid patterns alone. Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
68 lines
2.5 KiB
C
68 lines
2.5 KiB
C
/****************************************************************************
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* libs/libc/unistd/lib_setresuid.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 <unistd.h>
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#include <errno.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: setresuid
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*
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* Description:
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* The setresuid() function sets the real, effective, and saved set-user-ID
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* of the calling process. Stub when CONFIG_SCHED_USER_IDENTITY is
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* disabled: only root (0) or unchanged ((uid_t)-1) values are accepted.
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*
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* Input Parameters:
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* ruid - Real user ID, or (uid_t)-1 to leave unchanged.
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* euid - Effective user ID, or (uid_t)-1 to leave unchanged.
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* suid - Saved set-user-ID, or (uid_t)-1 to leave unchanged.
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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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* appropriately.
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*
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****************************************************************************/
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int setresuid(uid_t ruid, uid_t euid, uid_t suid)
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{
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/* NuttX only supports the user identity 'root' with a uid value of 0. */
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if ((ruid == (uid_t)-1 || ruid == 0) &&
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(euid == (uid_t)-1 || euid == 0) &&
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(suid == (uid_t)-1 || suid == 0))
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{
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return 0;
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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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