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/*
* Routines to take a syscallrecord and turn it into an ascii representation.
*/
#include <stdio.h>
#include "arch.h" //PAGE_MASK
#include "arg-decoder.h"
#include "params.h" // logging, quiet_level
#include "pids.h"
#include "shm.h"
#include "syscall.h"
#include "tables.h"
#include "utils.h"
static char * decode_argtype(char *sptr, unsigned long reg, enum argtype type)
{
switch (type) {
case ARG_PATHNAME:
sptr += sprintf(sptr, "\"%s\"", (char *) reg);
break;
case ARG_PID:
case ARG_FD:
case ARG_SOCKETINFO:
sptr += sprintf(sptr, "%ld", (long) reg);
break;
case ARG_MODE_T:
sptr += sprintf(sptr, "%o", (mode_t) reg);
break;
case ARG_ADDRESS:
case ARG_NON_NULL_ADDRESS:
case ARG_IOVEC:
case ARG_SOCKADDR:
sptr += sprintf(sptr, "0x%lx", reg);
break;
case ARG_MMAP:
/* Although generic sanitise has set this to a map struct,
* common_set_mmap_ptr_len() will subsequently set it to the ->ptr
* in the per syscall ->sanitise routine. */
sptr += sprintf(sptr, "%p", (void *) reg);
break;
case ARG_OP:
case ARG_LIST:
sptr += sprintf(sptr, "0x%lx", reg);
break;
case ARG_UNDEFINED:
case ARG_LEN:
case ARG_RANGE:
case ARG_CPU:
case ARG_IOVECLEN:
case ARG_SOCKADDRLEN:
if (((long) reg < -16384) || ((long) reg > 16384)) {
/* Print everything outside -16384 and 16384 as hex. */
sptr += sprintf(sptr, "0x%lx", reg);
} else {
/* Print everything else as signed decimal. */
sptr += sprintf(sptr, "%ld", (long) reg);
}
break;
}
return sptr;
}
static char * render_arg(struct syscallrecord *rec, char *sptr, unsigned int argnum, struct syscallentry *entry)
{
const char *name = NULL;
unsigned long reg = 0;
enum argtype type = 0;
switch (argnum) {
case 1: type = entry->arg1type;
name = entry->arg1name;
reg = rec->a1;
break;
case 2: type = entry->arg2type;
name = entry->arg2name;
reg = rec->a2;
break;
case 3: type = entry->arg3type;
name = entry->arg3name;
reg = rec->a3;
break;
case 4: type = entry->arg4type;
name = entry->arg4name;
reg = rec->a4;
break;
case 5: type = entry->arg5type;
name = entry->arg5name;
reg = rec->a5;
break;
case 6: type = entry->arg6type;
name = entry->arg6name;
reg = rec->a6;
break;
}
if (argnum != 1)
sptr += sprintf(sptr, ", ");
sptr += sprintf(sptr, "%s=", name);
sptr = decode_argtype(sptr, reg, type);
if (entry->decode != NULL) {
char *str;
str = entry->decode(rec, argnum);
if (str != NULL) {
sptr += sprintf(sptr, "%s", str);
free(str);
}
}
return sptr;
}
/*
* Used from output_syscall_prefix, and also from postmortem dumper
*/
static unsigned int render_syscall_prefix(struct syscallrecord *rec, char *bufferstart)
{
struct syscallentry *entry;
struct childdata *child = this_child();
char *sptr = bufferstart;
unsigned int i;
unsigned int syscallnr;
syscallnr = rec->nr;
entry = get_syscall_entry(syscallnr, rec->do32bit);
sptr += sprintf(sptr, "[child%u:%u] [%lu] %s",
child->num, pids[child->num], child->op_nr,
rec->do32bit == TRUE ? "[32BIT] " : "");
sptr += sprintf(sptr, "%s(", entry->name);
for_each_arg(entry, i) {
sptr = render_arg(rec, sptr, i, entry);
}
sptr += sprintf(sptr, ") ");
return sptr - bufferstart;
}
static unsigned int render_syscall_postfix(struct syscallrecord *rec, char *bufferstart)
{
char *sptr = bufferstart;
if (IS_ERR(rec->retval)) {
sptr += sprintf(sptr, "= %ld (%s)",
(long) rec->retval, strerror(rec->errno_post));
} else {
sptr += sprintf(sptr, "= ");
if ((unsigned long) rec->retval > 10000)
sptr += sprintf(sptr, "0x%lx", rec->retval);
else
sptr += sprintf(sptr, "%ld", (long) rec->retval);
}
sptr += sprintf(sptr, "\n");
return sptr - bufferstart;
}
/* These next two functions are always called from child_random_syscalls() by a fuzzing child.
* They render the buffer, and output it to stdout.
* Other contexts (like post-mortem) directly use the buffers.
*/
void output_syscall_prefix(struct syscallrecord *rec)
{
static char *buffer = NULL;
unsigned int len;
if (buffer == NULL)
buffer = zmalloc(PREBUFFER_LEN);
len = render_syscall_prefix(rec, buffer);
/* copy child-local buffer to shm, and zero out trailing bytes */
memcpy(rec->prebuffer, buffer, len);
memset(rec->prebuffer + len, 0, PREBUFFER_LEN - len);
output_rendered_buffer(rec->prebuffer);
}
void output_syscall_postfix(struct syscallrecord *rec)
{
static char *buffer = NULL;
unsigned int len;
if (buffer == NULL)
buffer = zmalloc(POSTBUFFER_LEN);
len = render_syscall_postfix(rec, buffer);
/* copy child-local buffer to shm, and zero out trailing bytes */
memcpy(rec->postbuffer, buffer, len);
memset(rec->postbuffer + len, 0, POSTBUFFER_LEN - len);
output_rendered_buffer(rec->postbuffer);
}
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