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linuxkm/lkcapi_sha_glue.c: in wc_linuxkm_drbg_generate(), generate randomness in batches that fit in RNG_MAX_BLOCK_LEN.

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This commit is contained in:
Daniel Pouzzner
2025-12-03 18:12:32 -06:00
parent aad0f7f184
commit 64ebc342a1
1 changed files with 33 additions and 15 deletions
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48
linuxkm/lkcapi_sha_glue.c
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@@ -1167,24 +1167,42 @@ retry:
}
}
ret = wc_RNG_GenerateBlock(&drbg->rng, dst, dlen);
if (unlikely(ret == WC_NO_ERR_TRACE(RNG_FAILURE_E)) && (! retried)) {
retried = 1;
wc_FreeRng(&drbg->rng);
ret = wc_InitRng(&drbg->rng);
if (ret == 0) {
pr_warn("WARNING: reinitialized DRBG #%d after RNG_FAILURE_E.", raw_smp_processor_id());
goto retry;
for (;;) {
#define RNG_MAX_BLOCK_LEN_ROUNDED (RNG_MAX_BLOCK_LEN & ~0xfU)
if (dlen > RNG_MAX_BLOCK_LEN_ROUNDED) {
ret = wc_RNG_GenerateBlock(&drbg->rng, dst, RNG_MAX_BLOCK_LEN_ROUNDED);
if (ret == 0) {
dlen -= RNG_MAX_BLOCK_LEN_ROUNDED;
dst += RNG_MAX_BLOCK_LEN_ROUNDED;
}
}
#undef RNG_MAX_BLOCK_LEN_ROUNDED
else {
pr_warn_once("ERROR: reinitialization of DRBG #%d after RNG_FAILURE_E failed with ret %d.", raw_smp_processor_id(), ret);
ret = -EINVAL;
ret = wc_RNG_GenerateBlock(&drbg->rng, dst, dlen);
dlen -= dlen;
}
}
else if (ret != 0) {
pr_warn_once("WARNING: wc_RNG_GenerateBlock returned %d\n",ret);
ret = -EINVAL;
if (unlikely(ret == WC_NO_ERR_TRACE(RNG_FAILURE_E)) && (! retried)) {
retried = 1;
wc_FreeRng(&drbg->rng);
ret = wc_InitRng(&drbg->rng);
if (ret == 0) {
pr_warn("WARNING: reinitialized DRBG #%d after RNG_FAILURE_E.", raw_smp_processor_id());
goto retry;
}
else {
pr_warn_once("ERROR: reinitialization of DRBG #%d after RNG_FAILURE_E failed with ret %d.", raw_smp_processor_id(), ret);
ret = -EINVAL;
}
}
else if (ret != 0) {
pr_warn_once("WARNING: wc_RNG_GenerateBlock returned %d\n",ret);
ret = -EINVAL;
break;
}
if (! dlen)
break;
}
out: