freebsd-dev/sys/compat/linux/linux_uid16.c
John Baldwin 44731cab3b Change the suser() API to take advantage of td_ucred as well as do a
general cleanup of the API.  The entire API now consists of two functions
similar to the pre-KSE API.  The suser() function takes a thread pointer
as its only argument.  The td_ucred member of this thread must be valid
so the only valid thread pointers are curthread and a few kernel threads
such as thread0.  The suser_cred() function takes a pointer to a struct
ucred as its first argument and an integer flag as its second argument.
The flag is currently only used for the PRISON_ROOT flag.

Discussed on:	smp@
2002-04-01 21:31:13 +00:00

290 lines
6.6 KiB
C

/*-
* Copyright (c) 2001 The FreeBSD Project
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#include "opt_compat.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/sysproto.h>
#include <machine/../linux/linux.h>
#include <machine/../linux/linux_proto.h>
#include <compat/linux/linux_util.h>
DUMMY(setfsuid16);
DUMMY(setfsgid16);
DUMMY(getresuid16);
DUMMY(getresgid16);
#define CAST_NOCHG(x) (x == 0xFFFF) ? -1 : x;
int
linux_chown16(struct thread *td, struct linux_chown16_args *args)
{
struct chown_args bsd;
caddr_t sg;
sg = stackgap_init();
CHECKALTEXIST(td, &sg, args->path);
#ifdef DEBUG
if (ldebug(chown16))
printf(ARGS(chown16, "%s, %d, %d"), args->path, args->uid,
args->gid);
#endif
bsd.path = args->path;
bsd.uid = CAST_NOCHG(args->uid);
bsd.gid = CAST_NOCHG(args->gid);
return (chown(td, &bsd));
}
int
linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
{
struct lchown_args bsd;
caddr_t sg;
sg = stackgap_init();
CHECKALTEXIST(td, &sg, args->path);
#ifdef DEBUG
if (ldebug(lchown16))
printf(ARGS(lchown16, "%s, %d, %d"), args->path, args->uid,
args->gid);
#endif
bsd.path = args->path;
bsd.uid = CAST_NOCHG(args->uid);
bsd.gid = CAST_NOCHG(args->gid);
return (lchown(td, &bsd));
}
int
linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args)
{
struct ucred *newcred, *oldcred;
l_gid16_t linux_gidset[NGROUPS];
gid_t *bsd_gidset;
int ngrp, error;
#ifdef DEBUG
if (ldebug(setgroups16))
printf(ARGS(setgroups16, "%d, *"), args->gidsetsize);
#endif
ngrp = args->gidsetsize;
oldcred = td->td_proc->p_ucred;
/*
* cr_groups[0] holds egid. Setting the whole set from
* the supplied set will cause egid to be changed too.
* Keep cr_groups[0] unchanged to prevent that.
*/
if ((error = suser_cred(oldcred, PRISON_ROOT)) != 0)
return (error);
if (ngrp >= NGROUPS)
return (EINVAL);
newcred = crdup(oldcred);
if (ngrp > 0) {
error = copyin((caddr_t)args->gidset, linux_gidset,
ngrp * sizeof(l_gid16_t));
if (error)
return (error);
newcred->cr_ngroups = ngrp + 1;
bsd_gidset = newcred->cr_groups;
ngrp--;
while (ngrp >= 0) {
bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
ngrp--;
}
}
else
newcred->cr_ngroups = 1;
setsugid(td->td_proc);
td->td_proc->p_ucred = newcred;
crfree(oldcred);
return (0);
}
int
linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args)
{
struct ucred *cred;
l_gid16_t linux_gidset[NGROUPS];
gid_t *bsd_gidset;
int bsd_gidsetsz, ngrp, error;
#ifdef DEBUG
if (ldebug(getgroups16))
printf(ARGS(getgroups16, "%d, *"), args->gidsetsize);
#endif
cred = td->td_ucred;
bsd_gidset = cred->cr_groups;
bsd_gidsetsz = cred->cr_ngroups - 1;
/*
* cr_groups[0] holds egid. Returning the whole set
* here will cause a duplicate. Exclude cr_groups[0]
* to prevent that.
*/
if ((ngrp = args->gidsetsize) == 0) {
td->td_retval[0] = bsd_gidsetsz;
return (0);
}
if (ngrp < bsd_gidsetsz)
return (EINVAL);
ngrp = 0;
while (ngrp < bsd_gidsetsz) {
linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
ngrp++;
}
error = copyout(linux_gidset, (caddr_t)args->gidset,
ngrp * sizeof(l_gid16_t));
if (error)
return (error);
td->td_retval[0] = ngrp;
return (0);
}
/*
* The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1]
* when COMPAT_43 or COMPAT_SUNOS is defined. This globbers registers that
* are assumed to be preserved. The following lightweight syscalls fixes
* this. See also linux_getpid(2), linux_getgid(2) and linux_getuid(2) in
* linux_misc.c
*
* linux_getgid16() - MP SAFE
* linux_getuid16() - MP SAFE
*/
int
linux_getgid16(struct thread *td, struct linux_getgid16_args *args)
{
td->td_retval[0] = td->td_ucred->cr_rgid;
return (0);
}
int
linux_getuid16(struct thread *td, struct linux_getuid16_args *args)
{
td->td_retval[0] = td->td_ucred->cr_ruid;
return (0);
}
int
linux_getegid16(struct thread *td, struct linux_getegid16_args *args)
{
struct getegid_args bsd;
return (getegid(td, &bsd));
}
int
linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args)
{
struct geteuid_args bsd;
return (geteuid(td, &bsd));
}
int
linux_setgid16(struct thread *td, struct linux_setgid16_args *args)
{
struct setgid_args bsd;
bsd.gid = args->gid;
return (setgid(td, &bsd));
}
int
linux_setuid16(struct thread *td, struct linux_setuid16_args *args)
{
struct setuid_args bsd;
bsd.uid = args->uid;
return (setuid(td, &bsd));
}
int
linux_setregid16(struct thread *td, struct linux_setregid16_args *args)
{
struct setregid_args bsd;
bsd.rgid = CAST_NOCHG(args->rgid);
bsd.egid = CAST_NOCHG(args->egid);
return (setregid(td, &bsd));
}
int
linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args)
{
struct setreuid_args bsd;
bsd.ruid = CAST_NOCHG(args->ruid);
bsd.euid = CAST_NOCHG(args->euid);
return (setreuid(td, &bsd));
}
int
linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args)
{
struct setresgid_args bsd;
bsd.rgid = CAST_NOCHG(args->rgid);
bsd.egid = CAST_NOCHG(args->egid);
bsd.sgid = CAST_NOCHG(args->sgid);
return (setresgid(td, &bsd));
}
int
linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args)
{
struct setresuid_args bsd;
bsd.ruid = CAST_NOCHG(args->ruid);
bsd.euid = CAST_NOCHG(args->euid);
bsd.suid = CAST_NOCHG(args->suid);
return (setresuid(td, &bsd));
}