44731cab3b
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@
290 lines
6.6 KiB
C
290 lines
6.6 KiB
C
/*-
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* Copyright (c) 2001 The FreeBSD Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/sysproto.h>
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#include <machine/../linux/linux.h>
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#include <machine/../linux/linux_proto.h>
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#include <compat/linux/linux_util.h>
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DUMMY(setfsuid16);
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DUMMY(setfsgid16);
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DUMMY(getresuid16);
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DUMMY(getresgid16);
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#define CAST_NOCHG(x) (x == 0xFFFF) ? -1 : x;
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int
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linux_chown16(struct thread *td, struct linux_chown16_args *args)
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{
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struct chown_args bsd;
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caddr_t sg;
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sg = stackgap_init();
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CHECKALTEXIST(td, &sg, args->path);
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#ifdef DEBUG
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if (ldebug(chown16))
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printf(ARGS(chown16, "%s, %d, %d"), args->path, args->uid,
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args->gid);
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#endif
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bsd.path = args->path;
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bsd.uid = CAST_NOCHG(args->uid);
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bsd.gid = CAST_NOCHG(args->gid);
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return (chown(td, &bsd));
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}
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int
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linux_lchown16(struct thread *td, struct linux_lchown16_args *args)
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{
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struct lchown_args bsd;
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caddr_t sg;
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sg = stackgap_init();
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CHECKALTEXIST(td, &sg, args->path);
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#ifdef DEBUG
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if (ldebug(lchown16))
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printf(ARGS(lchown16, "%s, %d, %d"), args->path, args->uid,
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args->gid);
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#endif
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bsd.path = args->path;
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bsd.uid = CAST_NOCHG(args->uid);
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bsd.gid = CAST_NOCHG(args->gid);
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return (lchown(td, &bsd));
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}
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int
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linux_setgroups16(struct thread *td, struct linux_setgroups16_args *args)
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{
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struct ucred *newcred, *oldcred;
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l_gid16_t linux_gidset[NGROUPS];
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gid_t *bsd_gidset;
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int ngrp, error;
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#ifdef DEBUG
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if (ldebug(setgroups16))
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printf(ARGS(setgroups16, "%d, *"), args->gidsetsize);
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#endif
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ngrp = args->gidsetsize;
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oldcred = td->td_proc->p_ucred;
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/*
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* cr_groups[0] holds egid. Setting the whole set from
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* the supplied set will cause egid to be changed too.
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* Keep cr_groups[0] unchanged to prevent that.
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*/
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if ((error = suser_cred(oldcred, PRISON_ROOT)) != 0)
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return (error);
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if (ngrp >= NGROUPS)
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return (EINVAL);
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newcred = crdup(oldcred);
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if (ngrp > 0) {
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error = copyin((caddr_t)args->gidset, linux_gidset,
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ngrp * sizeof(l_gid16_t));
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if (error)
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return (error);
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newcred->cr_ngroups = ngrp + 1;
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bsd_gidset = newcred->cr_groups;
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ngrp--;
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while (ngrp >= 0) {
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bsd_gidset[ngrp + 1] = linux_gidset[ngrp];
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ngrp--;
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}
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}
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else
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newcred->cr_ngroups = 1;
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setsugid(td->td_proc);
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td->td_proc->p_ucred = newcred;
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crfree(oldcred);
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return (0);
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}
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int
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linux_getgroups16(struct thread *td, struct linux_getgroups16_args *args)
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{
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struct ucred *cred;
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l_gid16_t linux_gidset[NGROUPS];
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gid_t *bsd_gidset;
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int bsd_gidsetsz, ngrp, error;
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#ifdef DEBUG
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if (ldebug(getgroups16))
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printf(ARGS(getgroups16, "%d, *"), args->gidsetsize);
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#endif
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cred = td->td_ucred;
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bsd_gidset = cred->cr_groups;
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bsd_gidsetsz = cred->cr_ngroups - 1;
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/*
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* cr_groups[0] holds egid. Returning the whole set
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* here will cause a duplicate. Exclude cr_groups[0]
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* to prevent that.
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*/
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if ((ngrp = args->gidsetsize) == 0) {
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td->td_retval[0] = bsd_gidsetsz;
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return (0);
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}
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if (ngrp < bsd_gidsetsz)
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return (EINVAL);
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ngrp = 0;
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while (ngrp < bsd_gidsetsz) {
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linux_gidset[ngrp] = bsd_gidset[ngrp + 1];
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ngrp++;
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}
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error = copyout(linux_gidset, (caddr_t)args->gidset,
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ngrp * sizeof(l_gid16_t));
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if (error)
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return (error);
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td->td_retval[0] = ngrp;
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return (0);
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}
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/*
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* The FreeBSD native getgid(2) and getuid(2) also modify td->td_retval[1]
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* when COMPAT_43 or COMPAT_SUNOS is defined. This globbers registers that
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* are assumed to be preserved. The following lightweight syscalls fixes
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* this. See also linux_getpid(2), linux_getgid(2) and linux_getuid(2) in
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* linux_misc.c
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*
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* linux_getgid16() - MP SAFE
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* linux_getuid16() - MP SAFE
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*/
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int
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linux_getgid16(struct thread *td, struct linux_getgid16_args *args)
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{
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td->td_retval[0] = td->td_ucred->cr_rgid;
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return (0);
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}
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int
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linux_getuid16(struct thread *td, struct linux_getuid16_args *args)
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{
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td->td_retval[0] = td->td_ucred->cr_ruid;
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return (0);
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}
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int
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linux_getegid16(struct thread *td, struct linux_getegid16_args *args)
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{
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struct getegid_args bsd;
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return (getegid(td, &bsd));
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}
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int
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linux_geteuid16(struct thread *td, struct linux_geteuid16_args *args)
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{
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struct geteuid_args bsd;
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return (geteuid(td, &bsd));
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}
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int
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linux_setgid16(struct thread *td, struct linux_setgid16_args *args)
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{
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struct setgid_args bsd;
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bsd.gid = args->gid;
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return (setgid(td, &bsd));
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}
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int
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linux_setuid16(struct thread *td, struct linux_setuid16_args *args)
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{
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struct setuid_args bsd;
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bsd.uid = args->uid;
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return (setuid(td, &bsd));
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}
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int
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linux_setregid16(struct thread *td, struct linux_setregid16_args *args)
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{
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struct setregid_args bsd;
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bsd.rgid = CAST_NOCHG(args->rgid);
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bsd.egid = CAST_NOCHG(args->egid);
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return (setregid(td, &bsd));
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}
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int
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linux_setreuid16(struct thread *td, struct linux_setreuid16_args *args)
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{
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struct setreuid_args bsd;
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bsd.ruid = CAST_NOCHG(args->ruid);
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bsd.euid = CAST_NOCHG(args->euid);
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return (setreuid(td, &bsd));
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}
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int
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linux_setresgid16(struct thread *td, struct linux_setresgid16_args *args)
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{
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struct setresgid_args bsd;
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bsd.rgid = CAST_NOCHG(args->rgid);
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bsd.egid = CAST_NOCHG(args->egid);
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bsd.sgid = CAST_NOCHG(args->sgid);
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return (setresgid(td, &bsd));
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}
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int
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linux_setresuid16(struct thread *td, struct linux_setresuid16_args *args)
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{
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struct setresuid_args bsd;
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bsd.ruid = CAST_NOCHG(args->ruid);
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bsd.euid = CAST_NOCHG(args->euid);
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bsd.suid = CAST_NOCHG(args->suid);
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return (setresuid(td, &bsd));
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}
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