838d985825
NGROUPS_MAX, eliminate ABI dependencies on them, and raise the to 1024
and 1023 respectively. (Previously they were equal, but under a close
reading of POSIX, NGROUPS_MAX was defined to be too large by 1 since it
is the number of supplemental groups, not total number of groups.)
The bulk of the change consists of converting the struct ucred member
cr_groups from a static array to a pointer. Do the equivalent in
kinfo_proc.
Introduce new interfaces crcopysafe() and crsetgroups() for duplicating
a process credential before modifying it and for setting group lists
respectively. Both interfaces take care for the details of allocating
groups array. crsetgroups() takes care of truncating the group list
to the current maximum (NGROUPS) if necessary. In the future,
crsetgroups() may be responsible for insuring invariants such as sorting
the supplemental groups to allow groupmember() to be implemented as a
binary search.
Because we can not change struct xucred without breaking application
ABIs, we leave it alone and introduce a new XU_NGROUPS value which is
always 16 and is to be used or NGRPS as appropriate for things such as
NFS which need to use no more than 16 groups. When feasible, truncate
the group list rather than generating an error.
Minor changes:
- Reduce the number of hand rolled versions of groupmember().
- Do not assign to both cr_gid and cr_groups[0].
- Modify ipfw to cache ucreds instead of part of their contents since
they are immutable once referenced by more than one entity.
Submitted by: Isilon Systems (initial implementation)
X-MFC after: never
PR: bin/113398 kern/133867
307 lines
7.1 KiB
C
307 lines
7.1 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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#include <sys/fcntl.h>
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysproto.h>
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#include <sys/systm.h>
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#ifdef COMPAT_LINUX32
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#include <machine/../linux32/linux.h>
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#include <machine/../linux32/linux32_proto.h>
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#else
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#include <machine/../linux/linux.h>
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#include <machine/../linux/linux_proto.h>
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#endif
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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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char *path;
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int error;
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LCONVPATHEXIST(td, args->path, &path);
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#ifdef DEBUG
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if (ldebug(chown16))
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printf(ARGS(chown16, "%s, %d, %d"), path, args->uid, args->gid);
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#endif
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error = kern_chown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
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CAST_NOCHG(args->gid));
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LFREEPATH(path);
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return (error);
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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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char *path;
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int error;
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LCONVPATHEXIST(td, args->path, &path);
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#ifdef DEBUG
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if (ldebug(lchown16))
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printf(ARGS(lchown16, "%s, %d, %d"), path, args->uid,
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args->gid);
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#endif
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error = kern_lchown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
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CAST_NOCHG(args->gid));
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LFREEPATH(path);
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return (error);
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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;
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gid_t *bsd_gidset;
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int ngrp, error;
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struct proc *p;
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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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if (ngrp < 0 || ngrp >= NGROUPS)
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return (EINVAL);
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linux_gidset = malloc(ngrp * sizeof(*linux_gidset), M_TEMP, M_WAITOK);
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error = copyin(args->gidset, linux_gidset, ngrp * sizeof(l_gid16_t));
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if (error)
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return (error);
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newcred = crget();
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p = td->td_proc;
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PROC_LOCK(p);
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oldcred = crcopysafe(p, newcred);
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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 = priv_check_cred(oldcred, PRIV_CRED_SETGROUPS, 0)) != 0) {
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PROC_UNLOCK(p);
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crfree(newcred);
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goto out;
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}
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if (ngrp > 0) {
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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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p->p_ucred = newcred;
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PROC_UNLOCK(p);
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crfree(oldcred);
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error = 0;
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out:
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free(linux_gidset, M_TEMP);
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return (error);
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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;
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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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linux_gidset = malloc(bsd_gidsetsz * sizeof(*linux_gidset),
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M_TEMP, M_WAITOK);
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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, args->gidset, ngrp * sizeof(l_gid16_t));
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free(linux_gidset, M_TEMP);
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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 is defined. This clobbers registers that are assumed to
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* be preserved. The following lightweight syscalls fixes this. See also
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* linux_getpid(2), linux_getgid(2) and linux_getuid(2) in 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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