mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-25 11:37:56 +00:00
65f20a89f1
imgp->interpreted to a bitmask instead of, functionally, a bool. Each imgactivator now requires its own flag in interpreted to indicate whether or not it has already examined argv[0]. Change imgp->interpreted to an unsigned char to add one extra bit for future use. With this change, one can execute a shell script from a 64bit host native make and still get the binmisc image activator to fire for the script interpreter. Prior to this, execution would fail. Phabric: https://reviews.freebsd.org/D696 Reviewed by: jhb@ MFC after: 4 weeks
767 lines
18 KiB
C
767 lines
18 KiB
C
/*-
|
|
* Copyright (c) 2013, Stacey D. Son
|
|
* 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 <sys/param.h>
|
|
#include <sys/ctype.h>
|
|
#include <sys/sbuf.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/exec.h>
|
|
#include <sys/imgact.h>
|
|
#include <sys/imgact_binmisc.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/libkern.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
/**
|
|
* Miscellaneous binary interpreter image activator.
|
|
*
|
|
* If the given target executable's header matches 'xbe_magic' field in the
|
|
* 'interpreter_list' then it will use the user-level interpreter specified in
|
|
* the 'xbe_interpreter' field to execute the binary. The 'xbe_magic' field may
|
|
* be adjusted to a given offset using the value in the 'xbe_moffset' field
|
|
* and bits of the header may be masked using the 'xbe_mask' field. The
|
|
* 'interpreter_list' entries are managed using sysctl(3) as described in the
|
|
* <sys/imgact_binmisc.h> file.
|
|
*/
|
|
|
|
/*
|
|
* Node of the interpreter list.
|
|
*/
|
|
typedef struct imgact_binmisc_entry {
|
|
char *ibe_name;
|
|
uint8_t *ibe_magic;
|
|
uint32_t ibe_moffset;
|
|
uint32_t ibe_msize;
|
|
uint8_t *ibe_mask;
|
|
uint8_t *ibe_interpreter;
|
|
uint32_t ibe_interp_argcnt;
|
|
uint32_t ibe_interp_length;
|
|
uint32_t ibe_flags;
|
|
SLIST_ENTRY(imgact_binmisc_entry) link;
|
|
} imgact_binmisc_entry_t;
|
|
|
|
/*
|
|
* sysctl() commands.
|
|
*/
|
|
#define IBC_ADD 1 /* Add given entry. */
|
|
#define IBC_REMOVE 2 /* Remove entry for a given name. */
|
|
#define IBC_DISABLE 3 /* Disable entry for a given name. */
|
|
#define IBC_ENABLE 4 /* Enable entry for a given name. */
|
|
#define IBC_LOOKUP 5 /* Lookup and return entry for given name. */
|
|
#define IBC_LIST 6 /* Get a snapshot of the interpretor list. */
|
|
|
|
/*
|
|
* Interpreter string macros.
|
|
*
|
|
* They all start with '#' followed by a single letter:
|
|
*/
|
|
#define ISM_POUND '#' /* "##" is the escape sequence for single #. */
|
|
#define ISM_OLD_ARGV0 'a' /* "#a" is replaced with the old argv0. */
|
|
|
|
MALLOC_DEFINE(M_BINMISC, KMOD_NAME, "misc binary image activator");
|
|
|
|
/* The interpreter list. */
|
|
static SLIST_HEAD(, imgact_binmisc_entry) interpreter_list =
|
|
SLIST_HEAD_INITIALIZER(interpreter_list);
|
|
|
|
static int interp_list_entry_count = 0;
|
|
|
|
static struct mtx interp_list_mtx;
|
|
|
|
int imgact_binmisc_exec(struct image_params *imgp);
|
|
|
|
|
|
/*
|
|
* Populate the entry with the information about the interpreter.
|
|
*/
|
|
static void
|
|
imgact_binmisc_populate_interp(char *str, imgact_binmisc_entry_t *ibe)
|
|
{
|
|
uint32_t len = 0, argc = 1;
|
|
char t[IBE_INTERP_LEN_MAX];
|
|
char *sp, *tp;
|
|
|
|
bzero(t, sizeof(t));
|
|
|
|
/*
|
|
* Normalize interpreter string. Replace white space between args with
|
|
* single space.
|
|
*/
|
|
sp = str; tp = t;
|
|
while (*sp != '\0') {
|
|
if (*sp == ' ' || *sp == '\t') {
|
|
if (++len > IBE_INTERP_LEN_MAX)
|
|
break;
|
|
*tp++ = ' ';
|
|
argc++;
|
|
while (*sp == ' ' || *sp == '\t')
|
|
sp++;
|
|
continue;
|
|
} else {
|
|
*tp++ = *sp++;
|
|
len++;
|
|
}
|
|
}
|
|
*tp = '\0';
|
|
len++;
|
|
|
|
ibe->ibe_interpreter = malloc(len, M_BINMISC, M_WAITOK|M_ZERO);
|
|
|
|
/* Populate all the ibe fields for the interpreter. */
|
|
memcpy(ibe->ibe_interpreter, t, len);
|
|
ibe->ibe_interp_argcnt = argc;
|
|
ibe->ibe_interp_length = len;
|
|
}
|
|
|
|
/*
|
|
* Allocate memory and populate a new entry for the interpreter table.
|
|
*/
|
|
static imgact_binmisc_entry_t *
|
|
imgact_binmisc_new_entry(ximgact_binmisc_entry_t *xbe)
|
|
{
|
|
imgact_binmisc_entry_t *ibe = NULL;
|
|
size_t namesz = min(strlen(xbe->xbe_name) + 1, IBE_NAME_MAX);
|
|
|
|
mtx_assert(&interp_list_mtx, MA_NOTOWNED);
|
|
|
|
ibe = malloc(sizeof(*ibe), M_BINMISC, M_WAITOK|M_ZERO);
|
|
|
|
ibe->ibe_name = malloc(namesz, M_BINMISC, M_WAITOK|M_ZERO);
|
|
strlcpy(ibe->ibe_name, xbe->xbe_name, namesz);
|
|
|
|
imgact_binmisc_populate_interp(xbe->xbe_interpreter, ibe);
|
|
|
|
ibe->ibe_magic = malloc(xbe->xbe_msize, M_BINMISC, M_WAITOK|M_ZERO);
|
|
memcpy(ibe->ibe_magic, xbe->xbe_magic, xbe->xbe_msize);
|
|
|
|
ibe->ibe_mask = malloc(xbe->xbe_msize, M_BINMISC, M_WAITOK|M_ZERO);
|
|
memcpy(ibe->ibe_mask, xbe->xbe_mask, xbe->xbe_msize);
|
|
|
|
ibe->ibe_moffset = xbe->xbe_moffset;
|
|
ibe->ibe_msize = xbe->xbe_msize;
|
|
ibe->ibe_flags = xbe->xbe_flags;
|
|
|
|
return (ibe);
|
|
}
|
|
|
|
/*
|
|
* Free the allocated memory for a given list item.
|
|
*/
|
|
static void
|
|
imgact_binmisc_destroy_entry(imgact_binmisc_entry_t *ibe)
|
|
{
|
|
if (!ibe)
|
|
return;
|
|
if (ibe->ibe_magic)
|
|
free(ibe->ibe_magic, M_BINMISC);
|
|
if (ibe->ibe_mask)
|
|
free(ibe->ibe_mask, M_BINMISC);
|
|
if (ibe->ibe_interpreter)
|
|
free(ibe->ibe_interpreter, M_BINMISC);
|
|
if (ibe->ibe_name)
|
|
free(ibe->ibe_name, M_BINMISC);
|
|
if (ibe)
|
|
free(ibe, M_BINMISC);
|
|
}
|
|
|
|
/*
|
|
* Find the interpreter in the list by the given name. Return NULL if not
|
|
* found.
|
|
*/
|
|
static imgact_binmisc_entry_t *
|
|
imgact_binmisc_find_entry(char *name)
|
|
{
|
|
imgact_binmisc_entry_t *ibe;
|
|
|
|
mtx_assert(&interp_list_mtx, MA_OWNED);
|
|
|
|
SLIST_FOREACH(ibe, &interpreter_list, link) {
|
|
if (strncmp(name, ibe->ibe_name, IBE_NAME_MAX) == 0)
|
|
return (ibe);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Add the given interpreter if it doesn't already exist. Return EEXIST
|
|
* if the name already exist in the interpreter list.
|
|
*/
|
|
static int
|
|
imgact_binmisc_add_entry(ximgact_binmisc_entry_t *xbe)
|
|
{
|
|
imgact_binmisc_entry_t *ibe;
|
|
char *p;
|
|
|
|
if (xbe->xbe_msize > IBE_MAGIC_MAX)
|
|
return (EINVAL);
|
|
|
|
for(p = xbe->xbe_name; *p != 0; p++)
|
|
if (!isascii((int)*p))
|
|
return (EINVAL);
|
|
|
|
for(p = xbe->xbe_interpreter; *p != 0; p++)
|
|
if (!isascii((int)*p))
|
|
return (EINVAL);
|
|
|
|
/* Make sure we don't have any invalid #'s. */
|
|
p = xbe->xbe_interpreter;
|
|
while (1) {
|
|
p = strchr(p, '#');
|
|
if (!p)
|
|
break;
|
|
|
|
p++;
|
|
switch(*p) {
|
|
case ISM_POUND:
|
|
/* "##" */
|
|
p++;
|
|
break;
|
|
|
|
case ISM_OLD_ARGV0:
|
|
/* "#a" */
|
|
p++;
|
|
break;
|
|
|
|
case 0:
|
|
default:
|
|
/* Anything besides the above is invalid. */
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
|
|
mtx_lock(&interp_list_mtx);
|
|
if (imgact_binmisc_find_entry(xbe->xbe_name) != NULL) {
|
|
mtx_unlock(&interp_list_mtx);
|
|
return (EEXIST);
|
|
}
|
|
mtx_unlock(&interp_list_mtx);
|
|
|
|
ibe = imgact_binmisc_new_entry(xbe);
|
|
if (!ibe)
|
|
return (ENOMEM);
|
|
|
|
mtx_lock(&interp_list_mtx);
|
|
SLIST_INSERT_HEAD(&interpreter_list, ibe, link);
|
|
interp_list_entry_count++;
|
|
mtx_unlock(&interp_list_mtx);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Remove the interpreter in the list with the given name. Return ENOENT
|
|
* if not found.
|
|
*/
|
|
static int
|
|
imgact_binmisc_remove_entry(char *name)
|
|
{
|
|
imgact_binmisc_entry_t *ibe;
|
|
|
|
mtx_lock(&interp_list_mtx);
|
|
if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
|
|
mtx_unlock(&interp_list_mtx);
|
|
return (ENOENT);
|
|
}
|
|
SLIST_REMOVE(&interpreter_list, ibe, imgact_binmisc_entry, link);
|
|
interp_list_entry_count--;
|
|
mtx_unlock(&interp_list_mtx);
|
|
|
|
imgact_binmisc_destroy_entry(ibe);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Disable the interpreter in the list with the given name. Return ENOENT
|
|
* if not found.
|
|
*/
|
|
static int
|
|
imgact_binmisc_disable_entry(char *name)
|
|
{
|
|
imgact_binmisc_entry_t *ibe;
|
|
|
|
mtx_lock(&interp_list_mtx);
|
|
if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
|
|
mtx_unlock(&interp_list_mtx);
|
|
return (ENOENT);
|
|
}
|
|
|
|
ibe->ibe_flags &= ~IBF_ENABLED;
|
|
mtx_unlock(&interp_list_mtx);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Enable the interpreter in the list with the given name. Return ENOENT
|
|
* if not found.
|
|
*/
|
|
static int
|
|
imgact_binmisc_enable_entry(char *name)
|
|
{
|
|
imgact_binmisc_entry_t *ibe;
|
|
|
|
mtx_lock(&interp_list_mtx);
|
|
if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
|
|
mtx_unlock(&interp_list_mtx);
|
|
return (ENOENT);
|
|
}
|
|
|
|
ibe->ibe_flags |= IBF_ENABLED;
|
|
mtx_unlock(&interp_list_mtx);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
imgact_binmisc_populate_xbe(ximgact_binmisc_entry_t *xbe,
|
|
imgact_binmisc_entry_t *ibe)
|
|
{
|
|
uint32_t i;
|
|
|
|
mtx_assert(&interp_list_mtx, MA_OWNED);
|
|
|
|
bzero(xbe, sizeof(*xbe));
|
|
strlcpy(xbe->xbe_name, ibe->ibe_name, IBE_NAME_MAX);
|
|
|
|
/* Copy interpreter string. Replace NULL breaks with space. */
|
|
memcpy(xbe->xbe_interpreter, ibe->ibe_interpreter,
|
|
ibe->ibe_interp_length);
|
|
for(i = 0; i < (ibe->ibe_interp_length - 1); i++)
|
|
if (xbe->xbe_interpreter[i] == '\0')
|
|
xbe->xbe_interpreter[i] = ' ';
|
|
|
|
memcpy(xbe->xbe_magic, ibe->ibe_magic, ibe->ibe_msize);
|
|
memcpy(xbe->xbe_mask, ibe->ibe_mask, ibe->ibe_msize);
|
|
xbe->xbe_version = IBE_VERSION;
|
|
xbe->xbe_flags = ibe->ibe_flags;
|
|
xbe->xbe_moffset = ibe->ibe_moffset;
|
|
xbe->xbe_msize = ibe->ibe_msize;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Retrieve the interpreter with the give name and populate the
|
|
* ximgact_binmisc_entry structure. Return ENOENT if not found.
|
|
*/
|
|
static int
|
|
imgact_binmisc_lookup_entry(char *name, ximgact_binmisc_entry_t *xbe)
|
|
{
|
|
imgact_binmisc_entry_t *ibe;
|
|
int error = 0;
|
|
|
|
mtx_lock(&interp_list_mtx);
|
|
if ((ibe = imgact_binmisc_find_entry(name)) == NULL) {
|
|
mtx_unlock(&interp_list_mtx);
|
|
return (ENOENT);
|
|
}
|
|
|
|
error = imgact_binmisc_populate_xbe(xbe, ibe);
|
|
mtx_unlock(&interp_list_mtx);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Get a snapshot of all the interpreter entries in the list.
|
|
*/
|
|
static int
|
|
imgact_binmisc_get_all_entries(struct sysctl_req *req)
|
|
{
|
|
ximgact_binmisc_entry_t *xbe, *xbep;
|
|
imgact_binmisc_entry_t *ibe;
|
|
int error = 0, count;
|
|
|
|
mtx_lock(&interp_list_mtx);
|
|
count = interp_list_entry_count;
|
|
/* Don't block in malloc() while holding lock. */
|
|
xbe = malloc(sizeof(*xbe) * count, M_BINMISC, M_NOWAIT|M_ZERO);
|
|
if (!xbe) {
|
|
mtx_unlock(&interp_list_mtx);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
xbep = xbe;
|
|
SLIST_FOREACH(ibe, &interpreter_list, link) {
|
|
error = imgact_binmisc_populate_xbe(xbep++, ibe);
|
|
if (error)
|
|
break;
|
|
}
|
|
mtx_unlock(&interp_list_mtx);
|
|
|
|
if (!error)
|
|
error = SYSCTL_OUT(req, xbe, sizeof(*xbe) * count);
|
|
|
|
free(xbe, M_BINMISC);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* sysctl() handler for munipulating interpretor table.
|
|
* Not MP safe (locked by sysctl).
|
|
*/
|
|
static int
|
|
sysctl_kern_binmisc(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
ximgact_binmisc_entry_t xbe;
|
|
int error = 0;
|
|
|
|
switch(arg2) {
|
|
case IBC_ADD:
|
|
/* Add an entry. Limited to IBE_MAX_ENTRIES. */
|
|
error = SYSCTL_IN(req, &xbe, sizeof(xbe));
|
|
if (error)
|
|
return (error);
|
|
if (IBE_VERSION != xbe.xbe_version)
|
|
return (EINVAL);
|
|
if (interp_list_entry_count == IBE_MAX_ENTRIES)
|
|
return (ENOSPC);
|
|
error = imgact_binmisc_add_entry(&xbe);
|
|
break;
|
|
|
|
case IBC_REMOVE:
|
|
/* Remove an entry. */
|
|
error = SYSCTL_IN(req, &xbe, sizeof(xbe));
|
|
if (error)
|
|
return (error);
|
|
if (IBE_VERSION != xbe.xbe_version)
|
|
return (EINVAL);
|
|
error = imgact_binmisc_remove_entry(xbe.xbe_name);
|
|
break;
|
|
|
|
case IBC_DISABLE:
|
|
/* Disable an entry. */
|
|
error = SYSCTL_IN(req, &xbe, sizeof(xbe));
|
|
if (error)
|
|
return (error);
|
|
if (IBE_VERSION != xbe.xbe_version)
|
|
return (EINVAL);
|
|
error = imgact_binmisc_disable_entry(xbe.xbe_name);
|
|
break;
|
|
|
|
case IBC_ENABLE:
|
|
/* Enable an entry. */
|
|
error = SYSCTL_IN(req, &xbe, sizeof(xbe));
|
|
if (error)
|
|
return (error);
|
|
if (IBE_VERSION != xbe.xbe_version)
|
|
return (EINVAL);
|
|
error = imgact_binmisc_enable_entry(xbe.xbe_name);
|
|
break;
|
|
|
|
case IBC_LOOKUP:
|
|
/* Lookup an entry. */
|
|
error = SYSCTL_IN(req, &xbe, sizeof(xbe));
|
|
if (error)
|
|
return (error);
|
|
if (IBE_VERSION != xbe.xbe_version)
|
|
return (EINVAL);
|
|
error = imgact_binmisc_lookup_entry(xbe.xbe_name, &xbe);
|
|
if (!error)
|
|
error = SYSCTL_OUT(req, &xbe, sizeof(xbe));
|
|
break;
|
|
|
|
case IBC_LIST:
|
|
/* Return a snapshot of the interpretor list. */
|
|
|
|
if (!req->oldptr) {
|
|
/* No pointer then just return the list size. */
|
|
error = SYSCTL_OUT(req, 0, interp_list_entry_count *
|
|
sizeof(ximgact_binmisc_entry_t));
|
|
return (error);
|
|
} else
|
|
if (!req->oldlen)
|
|
return (EINVAL);
|
|
|
|
error = imgact_binmisc_get_all_entries(req);
|
|
break;
|
|
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_NODE(_kern, OID_AUTO, binmisc, CTLFLAG_RW, 0,
|
|
"Image activator for miscellaneous binaries");
|
|
|
|
SYSCTL_PROC(_kern_binmisc, OID_AUTO, add,
|
|
CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_ADD,
|
|
sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
|
|
"Add an activator entry");
|
|
|
|
SYSCTL_PROC(_kern_binmisc, OID_AUTO, remove,
|
|
CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_REMOVE,
|
|
sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
|
|
"Remove an activator entry");
|
|
|
|
SYSCTL_PROC(_kern_binmisc, OID_AUTO, disable,
|
|
CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_DISABLE,
|
|
sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
|
|
"Disable an activator entry");
|
|
|
|
SYSCTL_PROC(_kern_binmisc, OID_AUTO, enable,
|
|
CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_WR, NULL, IBC_ENABLE,
|
|
sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
|
|
"Enable an activator entry");
|
|
|
|
SYSCTL_PROC(_kern_binmisc, OID_AUTO, lookup,
|
|
CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_RW|CTLFLAG_ANYBODY, NULL, IBC_LOOKUP,
|
|
sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
|
|
"Lookup an activator entry");
|
|
|
|
SYSCTL_PROC(_kern_binmisc, OID_AUTO, list,
|
|
CTLFLAG_MPSAFE|CTLTYPE_STRUCT|CTLFLAG_RD|CTLFLAG_ANYBODY, NULL, IBC_LIST,
|
|
sysctl_kern_binmisc, "S,ximgact_binmisc_entry",
|
|
"Get snapshot of all the activator entries");
|
|
|
|
static imgact_binmisc_entry_t *
|
|
imgact_binmisc_find_interpreter(const char *image_header)
|
|
{
|
|
imgact_binmisc_entry_t *ibe;
|
|
const char *p;
|
|
int i;
|
|
size_t sz;
|
|
|
|
mtx_assert(&interp_list_mtx, MA_OWNED);
|
|
|
|
SLIST_FOREACH(ibe, &interpreter_list, link) {
|
|
if (!(IBF_ENABLED & ibe->ibe_flags))
|
|
continue;
|
|
|
|
p = image_header + ibe->ibe_moffset;
|
|
sz = ibe->ibe_msize;
|
|
if (IBF_USE_MASK & ibe->ibe_flags) {
|
|
/* Compare using mask. */
|
|
for (i = 0; i < sz; i++)
|
|
if ((*p++ ^ ibe->ibe_magic[i]) &
|
|
ibe->ibe_mask[i])
|
|
break;
|
|
} else {
|
|
for (i = 0; i < sz; i++)
|
|
if (*p++ ^ ibe->ibe_magic[i])
|
|
break;
|
|
}
|
|
if (i == ibe->ibe_msize)
|
|
return (ibe);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
int
|
|
imgact_binmisc_exec(struct image_params *imgp)
|
|
{
|
|
const char *image_header = imgp->image_header;
|
|
const char *fname = NULL;
|
|
int error = 0;
|
|
size_t offset, l;
|
|
imgact_binmisc_entry_t *ibe;
|
|
struct sbuf *sname;
|
|
char *s, *d;
|
|
|
|
/* Do we have an interpreter for the given image header? */
|
|
mtx_lock(&interp_list_mtx);
|
|
if ((ibe = imgact_binmisc_find_interpreter(image_header)) == NULL) {
|
|
mtx_unlock(&interp_list_mtx);
|
|
return (-1);
|
|
}
|
|
|
|
/* No interpreter nesting allowed. */
|
|
if (imgp->interpreted & IMGACT_BINMISC) {
|
|
mtx_unlock(&interp_list_mtx);
|
|
return (ENOEXEC);
|
|
}
|
|
|
|
imgp->interpreted |= IMGACT_BINMISC;
|
|
|
|
if (imgp->args->fname != NULL) {
|
|
fname = imgp->args->fname;
|
|
sname = NULL;
|
|
} else {
|
|
/* Use the fdescfs(5) path for fexecve(2). */
|
|
sname = sbuf_new_auto();
|
|
sbuf_printf(sname, "/dev/fd/%d", imgp->args->fd);
|
|
sbuf_finish(sname);
|
|
fname = sbuf_data(sname);
|
|
}
|
|
|
|
|
|
/*
|
|
* We need to "push" the interpreter in the arg[] list. To do this,
|
|
* we first shift all the other values in the `begin_argv' area to
|
|
* provide the exact amount of room for the values added. Set up
|
|
* `offset' as the number of bytes to be added to the `begin_argv'
|
|
* area.
|
|
*/
|
|
offset = ibe->ibe_interp_length;
|
|
|
|
/* Adjust the offset for #'s. */
|
|
s = ibe->ibe_interpreter;
|
|
while (1) {
|
|
s = strchr(s, '#');
|
|
if (!s)
|
|
break;
|
|
|
|
s++;
|
|
switch(*s) {
|
|
case ISM_POUND:
|
|
/* "##" -> "#": reduce offset by one. */
|
|
offset--;
|
|
break;
|
|
|
|
case ISM_OLD_ARGV0:
|
|
/* "#a" -> (old argv0): increase offset to fit fname */
|
|
offset += strlen(fname) - 2;
|
|
break;
|
|
|
|
default:
|
|
/* Hmm... This shouldn't happen. */
|
|
mtx_unlock(&interp_list_mtx);
|
|
printf("%s: Unknown macro #%c sequence in "
|
|
"interpreter string\n", KMOD_NAME, *(s + 1));
|
|
error = EINVAL;
|
|
goto done;
|
|
}
|
|
s++;
|
|
}
|
|
|
|
/* Check to make sure we won't overrun the stringspace. */
|
|
if (offset > imgp->args->stringspace) {
|
|
mtx_unlock(&interp_list_mtx);
|
|
error = E2BIG;
|
|
goto done;
|
|
}
|
|
|
|
/* Make room for the interpreter */
|
|
bcopy(imgp->args->begin_argv, imgp->args->begin_argv + offset,
|
|
imgp->args->endp - imgp->args->begin_argv);
|
|
|
|
/* Adjust everything by the offset. */
|
|
imgp->args->begin_envv += offset;
|
|
imgp->args->endp += offset;
|
|
imgp->args->stringspace -= offset;
|
|
|
|
/* Add the new argument(s) in the count. */
|
|
imgp->args->argc += ibe->ibe_interp_argcnt;
|
|
|
|
/*
|
|
* The original arg[] list has been shifted appropriately. Copy in
|
|
* the interpreter path.
|
|
*/
|
|
s = ibe->ibe_interpreter;
|
|
d = imgp->args->begin_argv;
|
|
while(*s != '\0') {
|
|
switch (*s) {
|
|
case '#':
|
|
/* Handle "#" in interpreter string. */
|
|
s++;
|
|
switch(*s) {
|
|
case ISM_POUND:
|
|
/* "##": Replace with a single '#' */
|
|
*d++ = '#';
|
|
break;
|
|
|
|
case ISM_OLD_ARGV0:
|
|
/* "#a": Replace with old arg0 (fname). */
|
|
if ((l = strlen(fname)) != 0) {
|
|
memcpy(d, fname, l);
|
|
d += l;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
/* Shouldn't happen but skip it if it does. */
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case ' ':
|
|
/* Replace space with NUL to seperate arguments. */
|
|
*d++ = '\0';
|
|
break;
|
|
|
|
default:
|
|
*d++ = *s;
|
|
break;
|
|
}
|
|
s++;
|
|
}
|
|
*d = '\0';
|
|
mtx_unlock(&interp_list_mtx);
|
|
|
|
if (!error)
|
|
imgp->interpreter_name = imgp->args->begin_argv;
|
|
|
|
|
|
done:
|
|
if (sname)
|
|
sbuf_delete(sname);
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
imgact_binmisc_init(void *arg)
|
|
{
|
|
|
|
mtx_init(&interp_list_mtx, KMOD_NAME, NULL, MTX_DEF);
|
|
}
|
|
|
|
static void
|
|
imgact_binmisc_fini(void *arg)
|
|
{
|
|
imgact_binmisc_entry_t *ibe, *ibe_tmp;
|
|
|
|
/* Free all the interpreters. */
|
|
mtx_lock(&interp_list_mtx);
|
|
SLIST_FOREACH_SAFE(ibe, &interpreter_list, link, ibe_tmp) {
|
|
SLIST_REMOVE(&interpreter_list, ibe, imgact_binmisc_entry,
|
|
link);
|
|
imgact_binmisc_destroy_entry(ibe);
|
|
}
|
|
mtx_unlock(&interp_list_mtx);
|
|
|
|
mtx_destroy(&interp_list_mtx);
|
|
}
|
|
|
|
SYSINIT(imgact_binmisc, SI_SUB_EXEC, SI_ORDER_MIDDLE, imgact_binmisc_init, 0);
|
|
SYSUNINIT(imgact_binmisc, SI_SUB_EXEC, SI_ORDER_MIDDLE, imgact_binmisc_fini, 0);
|
|
|
|
/*
|
|
* Tell kern_execve.c about it, with a little help from the linker.
|
|
*/
|
|
static struct execsw imgact_binmisc_execsw = { imgact_binmisc_exec, KMOD_NAME };
|
|
EXEC_SET(imgact_binmisc, imgact_binmisc_execsw);
|