337 lines
9.4 KiB
C
337 lines
9.4 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 <time.h>
|
|
#include <unistd.h>
|
|
|
|
#include "truss.h"
|
|
#include "syscall.h"
|
|
#include "extern.h"
|
|
|
|
static int fd = -1;
|
|
static int cpid = -1;
|
|
|
|
#include "linux_syscalls.h"
|
|
|
|
static int nsyscalls =
|
|
sizeof(linux_syscallnames) / sizeof(linux_syscallnames[0]);
|
|
|
|
/*
|
|
* This is what this particular file uses to keep track of a system call.
|
|
* It is probably not quite sufficient -- I can probably use the same
|
|
* structure for the various syscall personalities, and I also probably
|
|
* need to nest system calls (for signal handlers).
|
|
*
|
|
* 'struct syscall' describes the system call; it may be NULL, however,
|
|
* if we don't know about this particular system call yet.
|
|
*/
|
|
static struct linux_syscall {
|
|
struct syscall *sc;
|
|
const char *name;
|
|
int number;
|
|
unsigned long args[5];
|
|
int nargs; /* number of arguments -- *not* number of words! */
|
|
char **s_args; /* the printable arguments */
|
|
} fsc;
|
|
|
|
/* Clear up and free parts of the fsc structure. */
|
|
static __inline void
|
|
clear_fsc(void) {
|
|
if (fsc.s_args) {
|
|
int i;
|
|
for (i = 0; i < fsc.nargs; i++)
|
|
if (fsc.s_args[i])
|
|
free(fsc.s_args[i]);
|
|
free(fsc.s_args);
|
|
}
|
|
memset(&fsc, 0, sizeof(fsc));
|
|
}
|
|
|
|
/*
|
|
* Called when a process has entered a system call. nargs is the
|
|
* number of words, not number of arguments (a necessary distinction
|
|
* in some cases). Note that if the STOPEVENT() code in i386/i386/trap.c
|
|
* is ever changed these functions need to keep up.
|
|
*/
|
|
|
|
void
|
|
i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) {
|
|
char buf[32];
|
|
struct reg regs;
|
|
int syscall_num;
|
|
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 OPEN REGISTERS --\n");
|
|
return;
|
|
}
|
|
cpid = trussinfo->pid;
|
|
}
|
|
|
|
clear_fsc();
|
|
lseek(fd, 0L, 0);
|
|
if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) {
|
|
fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
|
|
return;
|
|
}
|
|
syscall_num = regs.r_eax;
|
|
|
|
fsc.number = syscall_num;
|
|
fsc.name =
|
|
(syscall_num < 0 || syscall_num > nsyscalls) ? NULL : linux_syscallnames[syscall_num];
|
|
if (!fsc.name) {
|
|
fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
|
|
}
|
|
|
|
if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
|
|
&& ((!strcmp(fsc.name, "linux_fork")
|
|
|| !strcmp(fsc.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?
|
|
*/
|
|
|
|
fsc.args[0] = regs.r_ebx;
|
|
fsc.args[1] = regs.r_ecx;
|
|
fsc.args[2] = regs.r_edx;
|
|
fsc.args[3] = regs.r_esi;
|
|
fsc.args[4] = regs.r_edi;
|
|
|
|
sc = get_syscall(fsc.name);
|
|
if (sc) {
|
|
fsc.nargs = sc->nargs;
|
|
} else {
|
|
#if DEBUG
|
|
fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
|
|
fsc.name, nargs);
|
|
#endif
|
|
fsc.nargs = nargs;
|
|
}
|
|
|
|
fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*));
|
|
memset(fsc.s_args, 0, fsc.nargs * sizeof(char*));
|
|
fsc.sc = sc;
|
|
|
|
/*
|
|
* At this point, we set up the system call arguments.
|
|
* We ignore any OUT ones, however -- those are arguments that
|
|
* are set by the system call, and so are probably meaningless
|
|
* now. This doesn't currently support arguments that are
|
|
* passed in *and* out, however.
|
|
*/
|
|
|
|
if (fsc.name) {
|
|
|
|
#if DEBUG
|
|
fprintf(stderr, "syscall %s(", fsc.name);
|
|
#endif
|
|
for (i = 0; i < fsc.nargs; i++) {
|
|
#if DEBUG
|
|
fprintf(stderr, "0x%x%s",
|
|
sc
|
|
? fsc.args[sc->args[i].offset]
|
|
: fsc.args[i],
|
|
i < (fsc.nargs - 1) ? "," : "");
|
|
#endif
|
|
if (sc && !(sc->args[i].type & OUT)) {
|
|
fsc.s_args[i] = print_arg(Procfd, &sc->args[i], fsc.args, 0, trussinfo);
|
|
}
|
|
}
|
|
#if DEBUG
|
|
fprintf(stderr, ")\n");
|
|
#endif
|
|
}
|
|
|
|
#if DEBUG
|
|
fprintf(trussinfo->outfile, "\n");
|
|
#endif
|
|
|
|
/*
|
|
* Some system calls should be printed out before they are done --
|
|
* execve() and exit(), for example, never return. Possibly change
|
|
* this to work for any system call that doesn't have an OUT
|
|
* parameter?
|
|
*/
|
|
|
|
if (fsc.name != NULL &&
|
|
(!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
|
|
|
|
/* XXX
|
|
* This could be done in a more general
|
|
* manner but it still wouldn't be very pretty.
|
|
*/
|
|
if (!strcmp(fsc.name, "linux_execve")) {
|
|
if ((trussinfo->flags & EXECVEARGS) == 0)
|
|
if (fsc.s_args[1]) {
|
|
free(fsc.s_args[1]);
|
|
fsc.s_args[1] = NULL;
|
|
}
|
|
if ((trussinfo->flags & EXECVEENVS) == 0)
|
|
if (fsc.s_args[2]) {
|
|
free(fsc.s_args[2]);
|
|
fsc.s_args[2] = NULL;
|
|
}
|
|
}
|
|
|
|
print_syscall(trussinfo, fsc.name, fsc.nargs, fsc.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,
|
|
};
|
|
|
|
long
|
|
i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
|
|
{
|
|
char buf[32];
|
|
struct reg regs;
|
|
long 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 OPEN REGISTERS --\n");
|
|
return (-1);
|
|
}
|
|
cpid = trussinfo->pid;
|
|
}
|
|
|
|
lseek(fd, 0L, 0);
|
|
if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) {
|
|
fprintf(trussinfo->outfile, "\n");
|
|
return (-1);
|
|
}
|
|
retval = regs.r_eax;
|
|
errorp = !!(regs.r_eflags & PSL_C);
|
|
|
|
/*
|
|
* This code, while simpler than the initial versions I used, could
|
|
* stand some significant cleaning.
|
|
*/
|
|
|
|
sc = fsc.sc;
|
|
if (!sc) {
|
|
for (i = 0; i < fsc.nargs; i++)
|
|
asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
|
|
} else {
|
|
/*
|
|
* Here, we only look for arguments that have OUT masked in --
|
|
* otherwise, they were handled in the syscall_entry function.
|
|
*/
|
|
for (i = 0; i < sc->nargs; i++) {
|
|
char *temp;
|
|
if (sc->args[i].type & OUT) {
|
|
/*
|
|
* If an error occurred, than don't bothe getting the data;
|
|
* it may not be valid.
|
|
*/
|
|
if (errorp)
|
|
asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
|
|
else
|
|
temp = print_arg(Procfd, &sc->args[i], fsc.args, retval, trussinfo);
|
|
fsc.s_args[i] = temp;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* It would probably be a good idea to merge the error handling,
|
|
* but that complicates things considerably.
|
|
*/
|
|
if (errorp) {
|
|
for (i = 0; (size_t)i < sizeof(bsd_to_linux_errno) / sizeof(int); i++)
|
|
if (retval == bsd_to_linux_errno[i])
|
|
break;
|
|
}
|
|
print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp,
|
|
errorp ? i : retval);
|
|
clear_fsc();
|
|
|
|
return (retval);
|
|
}
|