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54366c0bd7
freebsd-nq/sys/compat/linux/linux_uid16.c
Attilio Rao 54366c0bd7 - For kernel compiled only with KDTRACE_HOOKS and not any lock debugging 
option, unbreak the lock tracing release semantic by embedding
  calls to LOCKSTAT_PROFILE_RELEASE_LOCK() direclty in the inlined
  version of the releasing functions for mutex, rwlock and sxlock.
  Failing to do so skips the lockstat_probe_func invokation for
  unlocking.
- As part of the LOCKSTAT support is inlined in mutex operation, for
  kernel compiled without lock debugging options, potentially every
  consumer must be compiled including opt_kdtrace.h.
  Fix this by moving KDTRACE_HOOKS into opt_global.h and remove the
  dependency by opt_kdtrace.h for all files, as now only KDTRACE_FRAMES
  is linked there and it is only used as a compile-time stub [0].

[0] immediately shows some new bug as DTRACE-derived support for debug
in sfxge is broken and it was never really tested.  As it was not
including correctly opt_kdtrace.h before it was never enabled so it
was kept broken for a while.  Fix this by using a protection stub,
leaving sfxge driver authors the responsibility for fixing it
appropriately [1].

Sponsored by:	EMC / Isilon storage division
Discussed with:	rstone
[0] Reported by:	rstone
[1] Discussed with:	philip
2013-11-25 07:38:45 +00:00

441 lines
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/*-
* 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_chown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
CAST_NOCHG(args->gid));
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_lchown(td, path, UIO_SYSSPACE, CAST_NOCHG(args->uid),
CAST_NOCHG(args->gid));
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_TEMP, 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_TEMP);
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);
p->p_ucred = newcred;
PROC_UNLOCK(p);
crfree(oldcred);
error = 0;
out:
free(linux_gidset, M_TEMP);
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_TEMP, 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_TEMP);
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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