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strace/ipc.c
Dmitry V. Levin 3b499ca870 Fix indirect ipc subcall handling 
indirect_ipccall used to guess whether currently decoded ipc syscall is
an indirect subcall or not based on generic knowledge, while there is a
robust method to identify indirect ipc subcalls.

* defs.h (TRACE_INDIRECT_SUBCALL): New flag.
* ipc.c (indirect_ipccall): Check it.
* linux/subcall.h: Set it.
2015-01-12 14:27:11 +00:00

456 lines
10 KiB
C
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/*
* Copyright (c) 1993 Ulrich Pegelow <pegelow@moorea.uni-muenster.de>
* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 "defs.h"
#ifdef HAVE_MQUEUE_H
# include <mqueue.h>
#endif
#include <fcntl.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <sys/msg.h>
#include <sys/shm.h>
#ifndef MSG_STAT
#define MSG_STAT 11
#endif
#ifndef MSG_INFO
#define MSG_INFO 12
#endif
#ifndef SHM_STAT
#define SHM_STAT 13
#endif
#ifndef SHM_INFO
#define SHM_INFO 14
#endif
#ifndef SEM_STAT
#define SEM_STAT 18
#endif
#ifndef SEM_INFO
#define SEM_INFO 19
#endif
#if !defined IPC_64
# define IPC_64 0x100
#endif
extern void printsigevent(struct tcb *tcp, long arg);
#include "xlat/msgctl_flags.h"
#include "xlat/semctl_flags.h"
#include "xlat/shmctl_flags.h"
#include "xlat/resource_flags.h"
#include "xlat/shm_resource_flags.h"
#include "xlat/shm_flags.h"
#include "xlat/ipc_msg_flags.h"
#include "xlat/semop_flags.h"
int sys_msgget(struct tcb *tcp)
{
if (entering(tcp)) {
if (tcp->u_arg[0])
tprintf("%#lx, ", tcp->u_arg[0]);
else
tprints("IPC_PRIVATE, ");
if (printflags(resource_flags, tcp->u_arg[1] & ~0777, NULL) != 0)
tprints("|");
tprintf("%#lo", tcp->u_arg[1] & 0777);
}
return 0;
}
#ifdef IPC_64
# define PRINTCTL(flagset, arg, dflt) \
if ((arg) & IPC_64) tprints("IPC_64|"); \
printxval((flagset), (arg) &~ IPC_64, dflt)
#else
# define PRINTCTL printxval
#endif
static int
indirect_ipccall(struct tcb *tcp)
{
return tcp->s_ent->sys_flags & TRACE_INDIRECT_SUBCALL;
}
int sys_msgctl(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%lu, ", tcp->u_arg[0]);
PRINTCTL(msgctl_flags, tcp->u_arg[1], "MSG_???");
tprintf(", %#lx", tcp->u_arg[indirect_ipccall(tcp) ? 3 : 2]);
}
return 0;
}
static void
tprint_msgsnd(struct tcb *tcp, long addr, unsigned long count,
unsigned long flags)
{
long mtype;
if (umove(tcp, addr, &mtype) < 0) {
tprintf("%#lx", addr);
} else {
tprintf("{%lu, ", mtype);
printstr(tcp, addr + sizeof(mtype), count);
tprints("}");
}
tprintf(", %lu, ", count);
printflags(ipc_msg_flags, flags, "MSG_???");
}
int sys_msgsnd(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%d, ", (int) tcp->u_arg[0]);
if (indirect_ipccall(tcp)) {
tprint_msgsnd(tcp, tcp->u_arg[3], tcp->u_arg[1],
tcp->u_arg[2]);
} else {
tprint_msgsnd(tcp, tcp->u_arg[1], tcp->u_arg[2],
tcp->u_arg[3]);
}
}
return 0;
}
static void
tprint_msgrcv(struct tcb *tcp, long addr, unsigned long count, long msgtyp)
{
long mtype;
if (syserror(tcp) || umove(tcp, addr, &mtype) < 0) {
tprintf("%#lx", addr);
} else {
tprintf("{%lu, ", mtype);
printstr(tcp, addr + sizeof(mtype), count);
tprints("}");
}
tprintf(", %lu, %ld, ", count, msgtyp);
}
int sys_msgrcv(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%d, ", (int) tcp->u_arg[0]);
} else {
if (indirect_ipccall(tcp)) {
struct ipc_wrapper {
struct msgbuf *msgp;
long msgtyp;
} tmp;
if (umove(tcp, tcp->u_arg[3], &tmp) < 0) {
tprintf("%#lx, %lu, ",
tcp->u_arg[3], tcp->u_arg[1]);
} else {
tprint_msgrcv(tcp, (long) tmp.msgp,
tcp->u_arg[1], tmp.msgtyp);
}
printflags(ipc_msg_flags, tcp->u_arg[2], "MSG_???");
} else {
tprint_msgrcv(tcp, tcp->u_arg[1],
tcp->u_arg[2], tcp->u_arg[3]);
printflags(ipc_msg_flags, tcp->u_arg[4], "MSG_???");
}
}
return 0;
}
static void
tprint_sembuf(struct tcb *tcp, long addr, unsigned long count)
{
unsigned long i, max_count;
if (abbrev(tcp))
max_count = (max_strlen < count) ? max_strlen : count;
else
max_count = count;
if (!max_count) {
tprintf("%#lx, %lu", addr, count);
return;
}
for (i = 0; i < max_count; ++i) {
struct sembuf sb;
if (i)
tprints(", ");
if (umove(tcp, addr + i * sizeof(struct sembuf), &sb) < 0) {
if (i) {
tprints("{???}");
break;
} else {
tprintf("%#lx, %lu", addr, count);
return;
}
} else {
if (!i)
tprints("{");
tprintf("{%u, %d, ", sb.sem_num, sb.sem_op);
printflags(semop_flags, sb.sem_flg, "SEM_???");
tprints("}");
}
}
if (i < max_count || max_count < count)
tprints(", ...");
tprintf("}, %lu", count);
}
int sys_semop(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%lu, ", tcp->u_arg[0]);
if (indirect_ipccall(tcp)) {
tprint_sembuf(tcp, tcp->u_arg[3], tcp->u_arg[1]);
} else {
tprint_sembuf(tcp, tcp->u_arg[1], tcp->u_arg[2]);
}
}
return 0;
}
int sys_semtimedop(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%lu, ", tcp->u_arg[0]);
if (indirect_ipccall(tcp)) {
tprint_sembuf(tcp, tcp->u_arg[3], tcp->u_arg[1]);
tprints(", ");
#if defined(S390) || defined(S390X)
printtv(tcp, tcp->u_arg[2]);
#else
printtv(tcp, tcp->u_arg[4]);
#endif
} else {
tprint_sembuf(tcp, tcp->u_arg[1], tcp->u_arg[2]);
tprints(", ");
printtv(tcp, tcp->u_arg[3]);
}
}
return 0;
}
int sys_semget(struct tcb *tcp)
{
if (entering(tcp)) {
if (tcp->u_arg[0])
tprintf("%#lx", tcp->u_arg[0]);
else
tprints("IPC_PRIVATE");
tprintf(", %lu, ", tcp->u_arg[1]);
if (printflags(resource_flags, tcp->u_arg[2] & ~0777, NULL) != 0)
tprints("|");
tprintf("%#lo", tcp->u_arg[2] & 0777);
}
return 0;
}
int sys_semctl(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%lu, %lu, ", tcp->u_arg[0], tcp->u_arg[1]);
PRINTCTL(semctl_flags, tcp->u_arg[2], "SEM_???");
tprintf(", %#lx", tcp->u_arg[3]);
}
return 0;
}
int sys_shmget(struct tcb *tcp)
{
if (entering(tcp)) {
if (tcp->u_arg[0])
tprintf("%#lx", tcp->u_arg[0]);
else
tprints("IPC_PRIVATE");
tprintf(", %lu, ", tcp->u_arg[1]);
if (printflags(shm_resource_flags, tcp->u_arg[2] & ~0777, NULL) != 0)
tprints("|");
tprintf("%#lo", tcp->u_arg[2] & 0777);
}
return 0;
}
int sys_shmctl(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%lu, ", tcp->u_arg[0]);
PRINTCTL(shmctl_flags, tcp->u_arg[1], "SHM_???");
if (indirect_ipccall(tcp)) {
tprintf(", %#lx", tcp->u_arg[3]);
} else {
tprintf(", %#lx", tcp->u_arg[2]);
}
}
return 0;
}
int sys_shmat(struct tcb *tcp)
{
if (exiting(tcp)) {
tprintf("%lu", tcp->u_arg[0]);
if (indirect_ipccall(tcp)) {
tprintf(", %#lx, ", tcp->u_arg[3]);
printflags(shm_flags, tcp->u_arg[1], "SHM_???");
} else {
tprintf(", %#lx, ", tcp->u_arg[1]);
printflags(shm_flags, tcp->u_arg[2], "SHM_???");
}
if (syserror(tcp))
return 0;
if (indirect_ipccall(tcp)) {
unsigned long raddr;
if (umove(tcp, tcp->u_arg[2], &raddr) < 0)
return RVAL_NONE;
tcp->u_rval = raddr;
}
return RVAL_HEX;
}
return 0;
}
int sys_shmdt(struct tcb *tcp)
{
if (entering(tcp)) {
if (indirect_ipccall(tcp)) {
tprintf("%#lx", tcp->u_arg[3]);
} else {
tprintf("%#lx", tcp->u_arg[0]);
}
}
return 0;
}
int
sys_mq_open(struct tcb *tcp)
{
if (entering(tcp)) {
printpath(tcp, tcp->u_arg[0]);
tprints(", ");
/* flags */
tprint_open_modes(tcp->u_arg[1]);
if (tcp->u_arg[1] & O_CREAT) {
# ifndef HAVE_MQUEUE_H
tprintf(", %lx", tcp->u_arg[2]);
# else
struct mq_attr attr;
/* mode */
tprintf(", %#lo, ", tcp->u_arg[2]);
if (umove(tcp, tcp->u_arg[3], &attr) < 0)
tprints("{???}");
else
tprintf("{mq_maxmsg=%ld, mq_msgsize=%ld}",
(long) attr.mq_maxmsg,
(long) attr.mq_msgsize);
# endif
}
}
return 0;
}
int
sys_mq_timedsend(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%ld, ", tcp->u_arg[0]);
printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
tprintf(", %lu, %ld, ", tcp->u_arg[2], tcp->u_arg[3]);
printtv(tcp, tcp->u_arg[4]);
}
return 0;
}
int
sys_mq_timedreceive(struct tcb *tcp)
{
if (entering(tcp))
tprintf("%ld, ", tcp->u_arg[0]);
else {
printstr(tcp, tcp->u_arg[1], tcp->u_arg[2]);
tprintf(", %lu, %ld, ", tcp->u_arg[2], tcp->u_arg[3]);
printtv(tcp, tcp->u_arg[4]);
}
return 0;
}
int
sys_mq_notify(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%ld, ", tcp->u_arg[0]);
printsigevent(tcp, tcp->u_arg[1]);
}
return 0;
}
static void
printmqattr(struct tcb *tcp, long addr)
{
if (addr == 0)
tprints("NULL");
else {
# ifndef HAVE_MQUEUE_H
tprintf("%#lx", addr);
# else
struct mq_attr attr;
if (umove(tcp, addr, &attr) < 0) {
tprints("{...}");
return;
}
tprints("{mq_flags=");
tprint_open_modes(attr.mq_flags);
tprintf(", mq_maxmsg=%ld, mq_msgsize=%ld, mq_curmsg=%ld}",
(long) attr.mq_maxmsg, (long) attr.mq_msgsize,
(long) attr.mq_curmsgs);
# endif
}
}
int
sys_mq_getsetattr(struct tcb *tcp)
{
if (entering(tcp)) {
tprintf("%ld, ", tcp->u_arg[0]);
printmqattr(tcp, tcp->u_arg[1]);
tprints(", ");
} else
printmqattr(tcp, tcp->u_arg[2]);
return 0;
}
int
sys_ipc(struct tcb *tcp)
{
return printargs(tcp);
}
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