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Improve pre-sandbox setup #1825

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merged 2 commits into from
Sep 5, 2024
Merged

Improve pre-sandbox setup #1825

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c2537e7
Improve pre-sandbox setup
torben-hansen Sep 4, 2024
a653f8c
Fix declaration visibility
torben-hansen Sep 4, 2024
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17 changes: 11 additions & 6 deletions crypto/crypto.c
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Original file line number Diff line number Diff line change
Expand Up @@ -13,11 +13,11 @@
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */

#include <openssl/crypto.h>
#include <openssl/rand.h>

#include <assert.h>

#include "fipsmodule/rand/fork_detect.h"
#include "fipsmodule/rand/internal.h"
#include "fipsmodule/cpucap/internal.h"
#include "internal.h"


Expand Down Expand Up @@ -107,10 +107,15 @@ int CRYPTO_has_asm(void) {
void CRYPTO_pre_sandbox_init(void) {
// Read from /proc/cpuinfo if needed.
CRYPTO_library_init();
// Open /dev/urandom if needed.
CRYPTO_init_sysrand();
// Set up MADV_WIPEONFORK state if needed.
CRYPTO_get_fork_generation();

// The randomness generation subsystem has a few kernel touch points that
// can be blocked when sandboxed. For example, /dev/urandom, MADV_WIPEONFORK
// tagged state, and snapsafe allocated state. All this is implemented lazily.
// Invoke the top-level function that will kick off the lazy work pre-sandbox.
uint8_t buf[10];
if (RAND_bytes(buf, 10) != 1) {
abort();
}
}

const char *SSLeay_version(int which) { return OpenSSL_version(which); }
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