Steffen Lips wrote:
Hi everybody,
we have written a server application wich uses openssl. now we found
out, that memory increases rapidly.
Then we found out, that there are memory leaks in openssl. so try this
little program:
#include <openssl/bio.h>
#include <openssl/err.h>
#include <string.h>
void *crypto_mem_leak_cb(unsigned long order, const char *file, int
line, int num_bytes, void *addr)
{
printf("Leak: Order: %7d, File: %-28s, Line: %4d, Bytes: %5d, Addr:
%p\n", order, file, line, num_bytes, addr);
return addr;
}
int main()
{
CRYPTO_malloc_debug_init();
CRYPTO_mem_ctrl(CRYPTO_MEM_CHECK_ON);
char buffer[] = "Test";
BIO *bio = BIO_new_mem_buf(buffer, strlen(buffer));
BIO_free(bio);
adding a "CRYPTO_cleanup_all_ex_data();" helps here
ERR_free_strings();
ERR_remove_state(0);
CRYPTO_mem_leaks_cb(crypto_mem_leak_cb);
}
It will output something like this.
Leak: Order: 5, File: .\crypto\stack\stack.c , Line: 126,
Bytes: 16, Addr: 003D4210
...
How can we avoid this? we have many certificate operations, so we often
use BIOs.
I don't know what causes the memory leak in your server application
but the above example doesn't really show a memory leak openssl
Cheers,
Nils
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