void mmap_random_event(int type) {
int which;
switch(rand()%6) {
case 0: /* mmap random */
which=find_random_active_event();
setup_mmap(which);
break;
case 1: /* aux random */
break;
case 2: /* munmap random */
which=find_random_active_mmap();
if (which>=0) unmap_mmap(which,0);
break;
case 3: /* mmap read */
which=find_random_active_mmap();
if (which>=0) perf_mmap_read(which);
break;
case 4: /* trash mmap */
if (type & TYPE_TRASH_MMAP) {
trash_random_mmap();
}
break;
default:
break;
}
return;
}
void trash_random_mmap(void) {
int i,value;
stats.mmap_trash_attempts++;
i=find_random_active_mmap();
/* Exit if no events */
if (i<0) return;
value=rand();
if (ignore_but_dont_skip.trash_mmap) return;
/* can't write high pages? */
//event_data[i].mmap_size);
// *(event_data[i].mmap)=0xff;
// printf("Attempting to trash %p: ",mmaps[i].addr);
// mmap_print_prot(mmaps[i].prot);
// mmap_print_flags(mmaps[i].flags);
// printf("\n");
/* If not writable then we segfault */
if (!(mmaps[i].prot & PROT_WRITE)) {
// printf("trash: Not writable, skipping\n");
return;
}
if ( (mmaps[i].aux) && (mmaps[i].prot&PROT_WRITE)) {
// printf("trash: writable aux, skipping\n");
return;
}
memset(mmaps[i].addr,value, 1);//getpagesize());
if (logging&TYPE_TRASH_MMAP) {
sprintf(log_buffer,"Q %d %d %d\n",
value,
getpagesize(),
mmaps[i].fd);
write(log_fd,log_buffer,strlen(log_buffer));
}
stats.mmap_trash_successful++;
// printf("Done trashing\n");
}
void trash_random_mmap(void) {
int i,value;
stats.mmap_trash_attempts++;
i=find_random_active_mmap();
/* Exit if no events */
if (i<0) return;
// printf("Found %d %p\n",i,mmaps[i].addr);
value=rand();
if (ignore_but_dont_skip.trash_mmap) return;
/* can't write high pages? */
//event_data[i].mmap_size);
// *(event_data[i].mmap)=0xff;
// printf("Attempting to trash %p: ",mmaps[i].addr);
// mmap_print_prot(mmaps[i].prot);
// mmap_print_flags(mmaps[i].flags);
// printf("\n");
/* If not writable then we segfault */
if (!(mmaps[i].prot & PROT_WRITE)) {
// printf("trash: Not writable, skipping\n");
return;
}
if ( (mmaps[i].aux) && (mmaps[i].prot&PROT_WRITE)) {
// printf("trash: writable aux, skipping\n");
return;
}
/* Before we attempt to write the mmap, setup a signal handler */
signal(SIGSEGV, sigsegv_handler);
/* Save state before the memset */
/* If the memset segfaults then we will skip it */
if (!sigsetjmp(j_buf, 1)) {
memset(mmaps[i].addr,value, 1);//getpagesize());
}
else {
printf("Memset of mmap#%d at %p caused segfault!\n",i,mmaps[i].addr);
perf_pretty_print_mmap_flags(mmaps[i].flags);
perf_pretty_print_mmap_prot(mmaps[i].prot);
printf("size %d fd %d\n",mmaps[i].size,mmaps[i].fd);
printf("event: cpu=%d pid=%d group_fd=%d flags=%ld ",
event_data[mmaps[i].which_event].cpu,
event_data[mmaps[i].which_event].pid,
event_data[mmaps[i].which_event].group_fd,
event_data[mmaps[i].which_event].flags
);
perf_pretty_print_attr(stdout,
&event_data[mmaps[i].which_event].attr,
mmaps[i].fd);
}
/* Disable the seigsegv handler */
signal(SIGSEGV, SIG_DFL);
if (logging&TYPE_TRASH_MMAP) {
sprintf(log_buffer,"Q %d %d %d\n",
value,
getpagesize(),
mmaps[i].fd);
write(log_fd,log_buffer,strlen(log_buffer));
}
stats.mmap_trash_successful++;
// printf("Done trashing\n");
}
