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Keep RNG seed file descriptor open until the RNG is freed. #7586

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Keep RNG seed file descriptor open until the RNG is freed. #7586

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625ba8f
Keep RNG seed file descriptor open until the RNG is freed.
kareem-wolfssl May 24, 2024
288b63c
Initalize RNG seed fd in _InitRng.
kareem-wolfssl May 24, 2024
54b3613
Reset fd after closing it.
kareem-wolfssl May 28, 2024
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38 changes: 25 additions & 13 deletions wolfcrypt/src/random.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1652,6 +1652,10 @@ static int _InitRng(WC_RNG* rng, byte* nonce, word32 nonceSz,
}
#endif

#ifndef USE_WINDOWS_API
rng->seed.fd = 0;
#endif

#ifdef CUSTOM_RAND_GENERATE_BLOCK
ret = 0; /* success */
#else
Expand Down Expand Up @@ -2026,6 +2030,13 @@ int wc_FreeRng(WC_RNG* rng)
ret = WC_HW_E;
#endif

#ifndef USE_WINDOWS_API
if(rng->seed.fd != 0 && rng->seed.fd != -1) {
close(rng->seed.fd);
rng->seed.fd = -1;
}
#endif

return ret;
}

Expand Down Expand Up @@ -3990,20 +4001,22 @@ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
#endif /* HAVE_INTEL_RDSEED || HAVE_AMD_RDSEED */

#ifndef NO_DEV_URANDOM /* way to disable use of /dev/urandom */
os->fd = open("/dev/urandom", O_RDONLY);
if (os->fd == 0 || os->fd == -1) {
os->fd = open("/dev/urandom", O_RDONLY);
#if defined(DEBUG_WOLFSSL)
WOLFSSL_MSG("opened /dev/urandom.");
#endif
if (os->fd == -1)
#endif
{
/* may still have /dev/random */
os->fd = open("/dev/random", O_RDONLY);
#if defined(DEBUG_WOLFSSL)
WOLFSSL_MSG("opened /dev/urandom.");
WOLFSSL_MSG("opened /dev/random.");
#endif
if (os->fd == -1)
#endif
{
/* may still have /dev/random */
os->fd = open("/dev/random", O_RDONLY);
#if defined(DEBUG_WOLFSSL)
WOLFSSL_MSG("opened /dev/random.");
#endif
if (os->fd == -1)
return OPEN_RAN_E;
if (os->fd == -1)
return OPEN_RAN_E;
}
}
#if defined(DEBUG_WOLFSSL)
WOLFSSL_MSG("rnd read...");
Expand All @@ -4027,7 +4040,6 @@ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
#endif
}
}
close(os->fd);

return ret;
}
Expand Down
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