9897b20356
execve(). This could be done in a more general manner but it still wouldn't be very pretty. MFC after: 3 weeks
283 lines
7.6 KiB
C
283 lines
7.6 KiB
C
/*
|
|
* Copryight 1997 Sean Eric Fagan
|
|
*
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Sean Eric Fagan
|
|
* 4. Neither the name of the author may be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* Linux/i386-specific system call handling. Given how much of this code
|
|
* is taken from the freebsd equivalent, I can probably put even more of
|
|
* it in support routines that can be used by any personality support.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/pioctl.h>
|
|
|
|
#include <machine/reg.h>
|
|
#include <machine/psl.h>
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "truss.h"
|
|
#include "extern.h"
|
|
#include "syscall.h"
|
|
|
|
static int fd = -1;
|
|
static int cpid = -1;
|
|
extern int Procfd;
|
|
|
|
#include "linux_syscalls.h"
|
|
|
|
static int nsyscalls =
|
|
sizeof(linux_syscallnames) / sizeof(linux_syscallnames[0]);
|
|
|
|
/* See the comment in i386-fbsd.c about this structure. */
|
|
static struct linux_syscall {
|
|
struct syscall *sc;
|
|
char *name;
|
|
int number;
|
|
unsigned long args[5];
|
|
int nargs; /* number of arguments -- *not* number of words! */
|
|
char **s_args; /* the printable arguments */
|
|
} lsc;
|
|
|
|
static __inline void
|
|
clear_lsc() {
|
|
if (lsc.s_args) {
|
|
int i;
|
|
for (i = 0; i < lsc.nargs; i++)
|
|
if (lsc.s_args[i])
|
|
free(lsc.s_args[i]);
|
|
free(lsc.s_args);
|
|
}
|
|
memset(&lsc, 0, sizeof(lsc));
|
|
}
|
|
|
|
void
|
|
i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) {
|
|
char buf[32];
|
|
struct reg regs = { 0 };
|
|
int syscall;
|
|
int i;
|
|
struct syscall *sc;
|
|
|
|
if (fd == -1 || trussinfo->pid != cpid) {
|
|
sprintf(buf, "/proc/%d/regs", trussinfo->pid);
|
|
fd = open(buf, O_RDWR);
|
|
if (fd == -1) {
|
|
fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
|
|
return;
|
|
}
|
|
cpid = trussinfo->pid;
|
|
}
|
|
|
|
clear_lsc();
|
|
lseek(fd, 0L, 0);
|
|
i = read(fd, ®s, sizeof(regs));
|
|
syscall = regs.r_eax;
|
|
|
|
lsc.number = syscall;
|
|
lsc.name =
|
|
(syscall < 0 || syscall > nsyscalls) ? NULL : linux_syscallnames[syscall];
|
|
if (!lsc.name) {
|
|
fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d\n", syscall);
|
|
}
|
|
|
|
if (lsc.name && (trussinfo->flags & FOLLOWFORKS)
|
|
&& ((!strcmp(lsc.name, "linux_fork")
|
|
|| !strcmp(lsc.name, "linux_vfork"))))
|
|
{
|
|
trussinfo->in_fork = 1;
|
|
}
|
|
|
|
if (nargs == 0)
|
|
return;
|
|
|
|
/*
|
|
* Linux passes syscall arguments in registers, not
|
|
* on the stack. Fortunately, we've got access to the
|
|
* register set. Note that we don't bother checking the
|
|
* number of arguments. And what does linux do for syscalls
|
|
* that have more than five arguments?
|
|
*/
|
|
|
|
lsc.args[0] = regs.r_ebx;
|
|
lsc.args[1] = regs.r_ecx;
|
|
lsc.args[2] = regs.r_edx;
|
|
lsc.args[3] = regs.r_esi;
|
|
lsc.args[4] = regs.r_edi;
|
|
|
|
sc = get_syscall(lsc.name);
|
|
if (sc) {
|
|
lsc.nargs = sc->nargs;
|
|
} else {
|
|
#ifdef DEBUG
|
|
fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
|
|
lsc.name, nargs);
|
|
#endif
|
|
lsc.nargs = nargs;
|
|
}
|
|
|
|
lsc.s_args = malloc((1+lsc.nargs) * sizeof(char*));
|
|
memset(lsc.s_args, 0, lsc.nargs * sizeof(char*));
|
|
lsc.sc = sc;
|
|
|
|
if (lsc.name) {
|
|
|
|
#ifdef DEBUG
|
|
fprintf(stderr, "syscall %s(", lsc.name);
|
|
#endif
|
|
for (i = 0; i < lsc.nargs ; i++) {
|
|
#ifdef DEBUG
|
|
fprintf(stderr, "0x%x%s",
|
|
sc ?
|
|
lsc.args[sc->args[i].offset]
|
|
: lsc.args[i],
|
|
i < (lsc.nargs - 1) ? "," : "");
|
|
#endif
|
|
if (sc && !(sc->args[i].type & OUT)) {
|
|
lsc.s_args[i] = print_arg(Procfd, &sc->args[i], lsc.args);
|
|
}
|
|
}
|
|
#ifdef DEBUG
|
|
fprintf(stderr, ")\n");
|
|
#endif
|
|
}
|
|
|
|
if (!strcmp(lsc.name, "linux_execve") || !strcmp(lsc.name, "exit")) {
|
|
|
|
/* XXX
|
|
* This could be done in a more general
|
|
* manner but it still wouldn't be very pretty.
|
|
*/
|
|
if (!strcmp(lsc.name, "linux_execve")) {
|
|
if ((trussinfo->flags & EXECVEARGS) == 0)
|
|
if (lsc.s_args[1]) {
|
|
free(lsc.s_args[1]);
|
|
lsc.s_args[1] = NULL;
|
|
}
|
|
if ((trussinfo->flags & EXECVEENVS) == 0)
|
|
if (lsc.s_args[2]) {
|
|
free(lsc.s_args[2]);
|
|
lsc.s_args[2] = NULL;
|
|
}
|
|
}
|
|
|
|
print_syscall(trussinfo, lsc.name, lsc.nargs, lsc.s_args);
|
|
fprintf(trussinfo->outfile, "\n");
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Linux syscalls return negative errno's, we do positive and map them
|
|
*/
|
|
const int bsd_to_linux_errno[] = {
|
|
-0, -1, -2, -3, -4, -5, -6, -7, -8, -9,
|
|
-10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
|
|
-20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
|
|
-30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
|
|
-90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
|
|
-100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
|
|
-110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
|
|
-116, -66, -6, -6, -6, -6, -6, -37, -38, -9,
|
|
-6,
|
|
};
|
|
|
|
int
|
|
i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall) {
|
|
char buf[32];
|
|
struct reg regs;
|
|
int retval;
|
|
int i;
|
|
int errorp;
|
|
struct syscall *sc;
|
|
|
|
if (fd == -1 || trussinfo->pid != cpid) {
|
|
sprintf(buf, "/proc/%d/regs", trussinfo->pid);
|
|
fd = open(buf, O_RDONLY);
|
|
if (fd == -1) {
|
|
fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
|
|
return;
|
|
}
|
|
cpid = trussinfo->pid;
|
|
}
|
|
|
|
lseek(fd, 0L, 0);
|
|
if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) {
|
|
fprintf(trussinfo->outfile, "\n");
|
|
return;
|
|
}
|
|
retval = regs.r_eax;
|
|
errorp = !!(regs.r_eflags & PSL_C);
|
|
|
|
sc = lsc.sc;
|
|
if (!sc) {
|
|
for (i = 0; i < lsc.nargs; i++) {
|
|
lsc.s_args[i] = malloc(12);
|
|
sprintf(lsc.s_args[i], "0x%lx", lsc.args[i]);
|
|
}
|
|
} else {
|
|
for (i = 0; i < sc->nargs; i++) {
|
|
char *temp;
|
|
if (sc->args[i].type & OUT) {
|
|
if (errorp) {
|
|
temp = malloc(12);
|
|
sprintf(temp, "0x%lx", lsc.args[sc->args[i].offset]);
|
|
} else {
|
|
temp = print_arg(Procfd, &sc->args[i], lsc.args);
|
|
}
|
|
lsc.s_args[i] = temp;
|
|
}
|
|
}
|
|
}
|
|
if (errorp) {
|
|
for (i = 0; i < sizeof(bsd_to_linux_errno) / sizeof(int); i++)
|
|
if (retval == bsd_to_linux_errno[i])
|
|
break;
|
|
}
|
|
print_syscall_ret(trussinfo, lsc.name, lsc.nargs, lsc.s_args, errorp,
|
|
errorp ? i : retval);
|
|
clear_lsc();
|
|
|
|
return (retval);
|
|
}
|