From 7b4ffcf953f091a815df081911c5e75c8a38418d Mon Sep 17 00:00:00 2001 From: Phil Carmody Date: Fri, 24 Jul 2009 13:59:17 +0800 Subject: [PATCH] crypto: aes - Undefined behaviour in crypto_aes_expand_key It's undefined behaviour in C to write outside the bounds of an array. The key expansion routine takes a shortcut of creating 8 words at a time, but this creates 4 additional words which don't fit in the array. As everyone is hopefully now aware, GCC is at liberty to make any assumptions and optimisations it likes in situations where it can detect that UB has occured, up to and including nasal demons, and as the indices being accessed in the array are trivially calculable, it's rash to invite gcc to do take any liberties at all. Signed-off-by: Phil Carmody Signed-off-by: Herbert Xu --- crypto/aes_generic.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/crypto/aes_generic.c b/crypto/aes_generic.c index b8b66ec3883..e78b7ee44a7 100644 --- a/crypto/aes_generic.c +++ b/crypto/aes_generic.c @@ -1174,7 +1174,7 @@ EXPORT_SYMBOL_GPL(crypto_il_tab); ctx->key_enc[6 * i + 11] = t; \ } while (0) -#define loop8(i) do { \ +#define loop8tophalf(i) do { \ t = ror32(t, 8); \ t = ls_box(t) ^ rco_tab[i]; \ t ^= ctx->key_enc[8 * i]; \ @@ -1185,6 +1185,10 @@ EXPORT_SYMBOL_GPL(crypto_il_tab); ctx->key_enc[8 * i + 10] = t; \ t ^= ctx->key_enc[8 * i + 3]; \ ctx->key_enc[8 * i + 11] = t; \ +} while (0) + +#define loop8(i) do { \ + loop8tophalf(i); \ t = ctx->key_enc[8 * i + 4] ^ ls_box(t); \ ctx->key_enc[8 * i + 12] = t; \ t ^= ctx->key_enc[8 * i + 5]; \ @@ -1245,8 +1249,9 @@ int crypto_aes_expand_key(struct crypto_aes_ctx *ctx, const u8 *in_key, ctx->key_enc[5] = le32_to_cpu(key[5]); ctx->key_enc[6] = le32_to_cpu(key[6]); t = ctx->key_enc[7] = le32_to_cpu(key[7]); - for (i = 0; i < 7; ++i) + for (i = 0; i < 6; ++i) loop8(i); + loop8tophalf(i); break; }