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freebsd-skq/sys/compat/linux/linux_uid16.c
pfg 2a03579eb7 sys/compat: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 15:13:23 +00:00

443 lines
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_compat.h"
#include <sys/fcntl.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/sdt.h>
#include <sys/syscallsubr.h>
#include <sys/sysproto.h>
#include <sys/systm.h>
#ifdef COMPAT_LINUX32
#include <machine/../linux32/linux.h>
#include <machine/../linux32/linux32_proto.h>
#else
#include <machine/../linux/linux.h>
#include <machine/../linux/linux_proto.h>
#endif
#include <compat/linux/linux_dtrace.h>
#include <compat/linux/linux_util.h>
/* DTrace init */
LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
/**
* DTrace probes in this module.
*/
LIN_SDT_PROBE_DEFINE3(uid16, linux_chown16, entry, "char *", "l_uid16_t",
"l_gid16_t");
LIN_SDT_PROBE_DEFINE1(uid16, linux_chown16, conv_path, "char *");
LIN_SDT_PROBE_DEFINE1(uid16, linux_chown16, return, "int");
LIN_SDT_PROBE_DEFINE3(uid16, linux_lchown16, entry, "char *", "l_uid16_t",
"l_gid16_t");
LIN_SDT_PROBE_DEFINE1(uid16, linux_lchown16, conv_path, "char *");
LIN_SDT_PROBE_DEFINE1(uid16, linux_lchown16, return, "int");
LIN_SDT_PROBE_DEFINE2(uid16, linux_setgroups16, entry, "l_uint", "l_gid16_t *");
LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, copyin_error, "int");
LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, priv_check_cred_error, "int");
LIN_SDT_PROBE_DEFINE1(uid16, linux_setgroups16, return, "int");
LIN_SDT_PROBE_DEFINE2(uid16, linux_getgroups16, entry, "l_uint", "l_gid16_t *");
LIN_SDT_PROBE_DEFINE1(uid16, linux_getgroups16, copyout_error, "int");
LIN_SDT_PROBE_DEFINE1(uid16, linux_getgroups16, return, "int");
LIN_SDT_PROBE_DEFINE0(uid16, linux_getgid16, entry);
LIN_SDT_PROBE_DEFINE1(uid16, linux_getgid16, return, "int");
LIN_SDT_PROBE_DEFINE0(uid16, linux_getuid16, entry);
LIN_SDT_PROBE_DEFINE1(uid16, linux_getuid16, return, "int");
LIN_SDT_PROBE_DEFINE0(uid16, linux_getegid16, entry);
LIN_SDT_PROBE_DEFINE1(uid16, linux_getegid16, return, "int");
LIN_SDT_PROBE_DEFINE0(uid16, linux_geteuid16, entry);
LIN_SDT_PROBE_DEFINE1(uid16, linux_geteuid16, return, "int");
LIN_SDT_PROBE_DEFINE1(uid16, linux_setgid16, entry, "l_gid16_t");
LIN_SDT_PROBE_DEFINE1(uid16, linux_setgid16, return, "int");
LIN_SDT_PROBE_DEFINE1(uid16, linux_setuid16, entry, "l_uid16_t");
LIN_SDT_PROBE_DEFINE1(uid16, linux_setuid16, return, "int");
LIN_SDT_PROBE_DEFINE2(uid16, linux_setregid16, entry, "l_gid16_t", "l_gid16_t");
LIN_SDT_PROBE_DEFINE1(uid16, linux_setregid16, return, "int");
LIN_SDT_PROBE_DEFINE2(uid16, linux_setreuid16, entry, "l_uid16_t", "l_uid16_t");
LIN_SDT_PROBE_DEFINE1(uid16, linux_setreuid16, return, "int");
LIN_SDT_PROBE_DEFINE3(uid16, linux_setresgid16, entry, "l_gid16_t", "l_gid16_t",
"l_gid16_t");
LIN_SDT_PROBE_DEFINE1(uid16, linux_setresgid16, return, "int");
LIN_SDT_PROBE_DEFINE3(uid16, linux_setresuid16, entry, "l_uid16_t", "l_uid16_t",
"l_uid16_t");
LIN_SDT_PROBE_DEFINE1(uid16, linux_setresuid16, return, "int");
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)
{
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
/*
* The DTrace probes have to be after the LCONVPATHEXIST, as
* LCONVPATHEXIST may return on its own and we do not want to
* have a stray entry without the corresponding return.
*/
LIN_SDT_PROBE3(uid16, linux_chown16, entry, args->path, args->uid,
args->gid);
LIN_SDT_PROBE1(uid16, linux_chown16, conv_path, path);
error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), 0);
LFREEPATH(path);
LIN_SDT_PROBE1(uid16, linux_chown16, return, error);
return (error);
}
int
linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
{
char *path;
int error;
LCONVPATHEXIST(td, args->path, &path);
/*
* The DTrace probes have to be after the LCONVPATHEXIST, as
* LCONVPATHEXIST may return on its own and we do not want to
* have a stray entry without the corresponding return.
*/
LIN_SDT_PROBE3(uid16, linux_lchown16, entry, args->path, args->uid,
args->gid);
LIN_SDT_PROBE1(uid16, linux_lchown16, conv_path, path);
error = kern_fchownat(td, AT_FDCWD, path, UIO_SYSSPACE,
CAST_NOCHG(args->uid), CAST_NOCHG(args->gid), AT_SYMLINK_NOFOLLOW);
LFREEPATH(path);
LIN_SDT_PROBE1(uid16, linux_lchown16, return, error);
return (error);
}
int
linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args)
{
struct ucred *newcred, *oldcred;
l_gid16_t *linux_gidset;
gid_t *bsd_gidset;
int ngrp, error;
struct proc *p;
LIN_SDT_PROBE2(uid16, linux_setgroups16, entry, args->gidsetsize,
args->gidset);
ngrp = args->gidsetsize;
if (ngrp < 0 || ngrp >= ngroups_max + 1) {
LIN_SDT_PROBE1(uid16, linux_setgroups16, return, EINVAL);
return (EINVAL);
}
linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_LINUX, M_WAITOK);
error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t));
if (error) {
LIN_SDT_PROBE1(uid16, linux_setgroups16, copyin_error, error);
LIN_SDT_PROBE1(uid16, linux_setgroups16, return, error);
free(linux_gidset, M_LINUX);
return (error);
}
newcred = crget();
p = td->td_proc;
PROC_LOCK(p);
oldcred = crcopysafe(p, newcred);
/*
* 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 = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) {
PROC_UNLOCK(p);
crfree(newcred);
LIN_SDT_PROBE1(uid16, linux_setgroups16, priv_check_cred_error,
error);
goto out;
}
if (ngrp > 0) {
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);
proc_set_cred(p, newcred);
PROC_UNLOCK(p);
crfree(oldcred);
error = 0;
out:
free(linux_gidset, M_LINUX);
LIN_SDT_PROBE1(uid16, linux_setgroups16, return, error);
return (error);
}
int
linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args)
{
struct ucred *cred;
l_gid16_t *linux_gidset;
gid_t *bsd_gidset;
int bsd_gidsetsz, ngrp, error;
LIN_SDT_PROBE2(uid16, linux_getgroups16, entry, args->gidsetsize,
args->gidset);
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;
LIN_SDT_PROBE1(uid16, linux_getgroups16, return, 0);
return (0);
}
if (ngrp < bsd_gidsetsz) {
LIN_SDT_PROBE1(uid16, linux_getgroups16, return, EINVAL);
return (EINVAL);
}
ngrp = 0;
linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset),
M_LINUX, M_WAITOK);
while (ngrp < bsd_gidsetsz) {
linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
ngrp++;
}
error = copyout(linux_gidset, args->gidset, ngrp * sizeof(l_gid16_t));
free(linux_gidset, M_LINUX);
if (error) {
LIN_SDT_PROBE1(uid16, linux_getgroups16, copyout_error, error);
LIN_SDT_PROBE1(uid16, linux_getgroups16, return, error);
return (error);
}
td->td_retval[0] = ngrp;
LIN_SDT_PROBE1(uid16, linux_getgroups16, return, 0);
return (0);
}
/*
* The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1]
* when COMPAT_43 is defined. This clobbers 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)
{
LIN_SDT_PROBE0(uid16, linux_getgid16, entry);
td->td_retval[0] = td->td_ucred->cr_rgid;
LIN_SDT_PROBE1(uid16, linux_getgid16, return, 0);
return (0);
}
int
linux_getuid16(struct thread *td, struct linux_getuid16_args *args)
{
LIN_SDT_PROBE0(uid16, linux_getuid16, entry);
td->td_retval[0] = td->td_ucred->cr_ruid;
LIN_SDT_PROBE1(uid16, linux_getuid16, return, 0);
return (0);
}
int
linux_getegid16(struct thread *td, struct linux_getegid16_args *args)
{
struct getegid_args bsd;
int error;
LIN_SDT_PROBE0(uid16, linux_getegid16, entry);
error = sys_getegid(td, &bsd);
LIN_SDT_PROBE1(uid16, linux_getegid16, return, error);
return (error);
}
int
linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args)
{
struct geteuid_args bsd;
int error;
LIN_SDT_PROBE0(uid16, linux_geteuid16, entry);
error = sys_geteuid(td, &bsd);
LIN_SDT_PROBE1(uid16, linux_geteuid16, return, error);
return (error);
}
int
linux_setgid16(struct thread *td, struct linux_setgid16_args *args)
{
struct setgid_args bsd;
int error;
LIN_SDT_PROBE1(uid16, linux_setgid16, entry, args->gid);
bsd.gid = args->gid;
error = sys_setgid(td, &bsd);
LIN_SDT_PROBE1(uid16, linux_setgid16, return, error);
return (error);
}
int
linux_setuid16(struct thread *td, struct linux_setuid16_args *args)
{
struct setuid_args bsd;
int error;
LIN_SDT_PROBE1(uid16, linux_setuid16, entry, args->uid);
bsd.uid = args->uid;
error = sys_setuid(td, &bsd);
LIN_SDT_PROBE1(uid16, linux_setuid16, return, error);
return (error);
}
int
linux_setregid16(struct thread *td, struct linux_setregid16_args *args)
{
struct setregid_args bsd;
int error;
LIN_SDT_PROBE2(uid16, linux_setregid16, entry, args->rgid, args->egid);
bsd.rgid = CAST_NOCHG(args->rgid);
bsd.egid = CAST_NOCHG(args->egid);
error = sys_setregid(td, &bsd);
LIN_SDT_PROBE1(uid16, linux_setregid16, return, error);
return (error);
}
int
linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args)
{
struct setreuid_args bsd;
int error;
LIN_SDT_PROBE2(uid16, linux_setreuid16, entry, args->ruid, args->euid);
bsd.ruid = CAST_NOCHG(args->ruid);
bsd.euid = CAST_NOCHG(args->euid);
error = sys_setreuid(td, &bsd);
LIN_SDT_PROBE1(uid16, linux_setreuid16, return, error);
return (error);
}
int
linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args)
{
struct setresgid_args bsd;
int error;
LIN_SDT_PROBE3(uid16, linux_setresgid16, entry, args->rgid, args->egid,
args->sgid);
bsd.rgid = CAST_NOCHG(args->rgid);
bsd.egid = CAST_NOCHG(args->egid);
bsd.sgid = CAST_NOCHG(args->sgid);
error = sys_setresgid(td, &bsd);
LIN_SDT_PROBE1(uid16, linux_setresgid16, return, error);
return (error);
}
int
linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args)
{
struct setresuid_args bsd;
int error;
LIN_SDT_PROBE3(uid16, linux_setresuid16, entry, args->ruid, args->euid,
args->suid);
bsd.ruid = CAST_NOCHG(args->ruid);
bsd.euid = CAST_NOCHG(args->euid);
bsd.suid = CAST_NOCHG(args->suid);
error = sys_setresuid(td, &bsd);
LIN_SDT_PROBE1(uid16, linux_setresuid16, return, error);
return (error);
}
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