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/*
* Copyright (c) 2025 Ian Marco Moffett and L5 engineers
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/cdefs.h>
#include <sys/errno.h>
#include <os/ucred.h>
#include <os/ucred.h>
int
ucred_init(struct proc *proc, struct ucred *cred)
{
struct ucred *curcred;
if (cred == NULL) {
return -EINVAL;
}
if (proc != NULL) {
curcred = &proc->cred;
cred->ruid = curcred->ruid;
} else {
cred->ruid = 0;
}
cred->euid = cred->ruid;
cred->suid = cred->ruid;
return 0;
}
int
seteuid(uid_t euid)
{
struct proc *self = proc_self();
struct ucred *cred;
int retval = -EPERM;
if (__unlikely(self == NULL)) {
return -ESRCH;
}
/* Verify against current creds */
cred = &self->cred;
if (euid == cred->euid || euid == cred->ruid) {
cred->euid = euid;
retval = 0;
} else if (euid == cred->suid || cred->euid == 0) {
cred->euid = euid;
retval = 0;
}
return retval;
}
/*
* ARG0: EUID
*/
scret_t
sys_seteuid(struct syscall_args *scargs)
{
uid_t euid = SCARG(scargs, int, 0);
return seteuid(euid);
}
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