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Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random

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Pull /dev/random updates from Ted Ts'o:
 "This adds a memzero_explicit() call which is guaranteed not to be
  optimized away by GCC.  This is important when we are wiping
  cryptographically sensitive material"

* tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
  crypto: memzero_explicit - make sure to clear out sensitive data
  random: add and use memzero_explicit() for clearing data
This commit is contained in:
Linus Torvalds
2014-10-24 12:33:32 -07:00
parent 1c45d9a920 7185ad2672
commit 14d4cc0883
10 changed files with 36 additions and 19 deletions
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crypto/sha256_generic.c
+2 -3
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@@ -211,10 +211,9 @@ static void sha256_transform(u32 *state, const u8 *input)
/* clear any sensitive info... */
a = b = c = d = e = f = g = h = t1 = t2 = 0;
memset(W, 0, 64 * sizeof(u32));
memzero_explicit(W, 64 * sizeof(u32));
}
static int sha224_init(struct shash_desc *desc)
{
struct sha256_state *sctx = shash_desc_ctx(desc);
@@ -317,7 +316,7 @@ static int sha224_final(struct shash_desc *desc, u8 *hash)
sha256_final(desc, D);
memcpy(hash, D, SHA224_DIGEST_SIZE);
memset(D, 0, SHA256_DIGEST_SIZE);
memzero_explicit(D, SHA256_DIGEST_SIZE);
return 0;
}