FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_uid16.c

     /*-
      * 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: releng/12.0/sys/compat/linux/linux_uid16.c 326266 2017-11-27 15:13:23Z pfg $");
    
    #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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