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View Code? Open in Web Editor NEWA quick PoC to try out the "meltdown" timing attack.
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Tried to fork this code in order to remove need for TSX, but failed
Any idea? I'm just getting random noise.
I don't have any machines with TSX :(
The TEST_IN_OWN_PROCESS may not ok.
the TEST_PHRASE is in your own process address space, and can be read.
So the TEST_IN_OWN_PROCESS will work without problem.
But if you change TEST_PHRASE to some address witch can't read, the result will be noise.
I use mmap and mprotect make address can't read, then It will not work.
#if TEST_IN_OWN_PROCESS
static char* test = NULL;
int n = strlen(TEST_PHRASE);
test = (uint8_t *) mmap(NULL, n, PROT_READ|PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
memcpy(test, TEST_PHRASE, n);
// make array not readable.
mprotect(test, n, PROT_NONE);
start_addr = (unsigned long)test;
#else
......
Could not work
$ sudo ./meltdown
poke buffer: 0x103041000, page size: 4096
Why no hex dump printed then?
$ sw_vers
ProductName: Mac OS X
ProductVersion: 10.9.2
Fails to read outside of same process (Debian)
Has anyone managed to get this working on Ubuntu or Debian outside of it's own process? I can read inside the calling process no problem, but if I point it anywhere else I get garbage.
Illegal instruction
On
rs$ sysctl -n machdep.cpu.brand_string
Intel(R) Core(TM) M-5Y31 CPU @ 0.90GHz
and
rs$ sw_vers
ProductName: Mac OS X
ProductVersion: 10.13.2
BuildVersion: 17C88
i got
rs$ ./meltdown 0x0 10
poke buffer: 0x10f3c6000, page size: 4096
Illegal instruction: 4
It seems like M-5Y31 doesn't support TSX?
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