topic @Francisco C., sorry for in Intel® Software Guard Extensions (Intel® SGX)

free() Doesn't Work with TCMalloc Library

Elephant — Fri, 13 Sep 2019 04:10:42 GMT

Hi,

I was wondering if anyone was having memory leak issues because of the TCMalloc library? If so, how did you resolve the issue? Basically, I created a basic ecall function to test the malloc feature and looped to that ecall function multiple times, after some loops, I couldn't allocate anymore. So I think the free() function doesn't really free the enclave heap.

void ecall_test_function()
{
uint8_t *data = (uint8_t *)malloc(1024*16);
if (!data) return -1;
printf("data successfully allocated.");
free(data); // this has the same effect when it is commented out
}

My max heap size is set to 0xF00000, and I just had to loop to this function ~500 times to hit the error condition.

Are there similar experiences?

Kind Regards,
- Elephant

What SGX + OS versions are

Francisco_C_Intel — Wed, 18 Sep 2019 13:57:38 GMT

What SGX + OS versions are you seeing this issue in?

Thanks,
Francisco

@Francisco C., sorry for

Elephant — Fri, 29 Nov 2019 06:11:03 GMT

@Francisco C., sorry for replying a bit too late, but I did not use the TCMalloc for the time being because of this issue. But, the SDK version I was using was 2.5 and I am seeing this issue in both Ubuntu 16.04 and Ubuntu 18.04.

- elephant