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580be4aa GKH |
1 | From dec3d0b1071a0f3194e66a83d26ecf4aa8c5910e Mon Sep 17 00:00:00 2001 |
2 | From: Eric Biggers <ebiggers@google.com> | |
3 | Date: Sun, 31 Mar 2019 13:04:13 -0700 | |
4 | Subject: crypto: x86/crct10dif-pcl - fix use via crypto_shash_digest() | |
5 | ||
6 | From: Eric Biggers <ebiggers@google.com> | |
7 | ||
8 | commit dec3d0b1071a0f3194e66a83d26ecf4aa8c5910e upstream. | |
9 | ||
10 | The ->digest() method of crct10dif-pclmul reads the current CRC value | |
11 | from the shash_desc context. But this value is uninitialized, causing | |
12 | crypto_shash_digest() to compute the wrong result. Fix it. | |
13 | ||
14 | Probably this wasn't noticed before because lib/crc-t10dif.c only uses | |
15 | crypto_shash_update(), not crypto_shash_digest(). Likewise, | |
16 | crypto_shash_digest() is not yet tested by the crypto self-tests because | |
17 | those only test the ahash API which only uses shash init/update/final. | |
18 | ||
19 | Fixes: 0b95a7f85718 ("crypto: crct10dif - Glue code to cast accelerated CRCT10DIF assembly as a crypto transform") | |
20 | Cc: <stable@vger.kernel.org> # v3.11+ | |
21 | Cc: Tim Chen <tim.c.chen@linux.intel.com> | |
22 | Signed-off-by: Eric Biggers <ebiggers@google.com> | |
23 | Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> | |
24 | Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> | |
25 | ||
26 | --- | |
27 | arch/x86/crypto/crct10dif-pclmul_glue.c | 13 +++++-------- | |
28 | 1 file changed, 5 insertions(+), 8 deletions(-) | |
29 | ||
30 | --- a/arch/x86/crypto/crct10dif-pclmul_glue.c | |
31 | +++ b/arch/x86/crypto/crct10dif-pclmul_glue.c | |
32 | @@ -76,15 +76,14 @@ static int chksum_final(struct shash_des | |
33 | return 0; | |
34 | } | |
35 | ||
36 | -static int __chksum_finup(__u16 *crcp, const u8 *data, unsigned int len, | |
37 | - u8 *out) | |
38 | +static int __chksum_finup(__u16 crc, const u8 *data, unsigned int len, u8 *out) | |
39 | { | |
40 | if (irq_fpu_usable()) { | |
41 | kernel_fpu_begin(); | |
42 | - *(__u16 *)out = crc_t10dif_pcl(*crcp, data, len); | |
43 | + *(__u16 *)out = crc_t10dif_pcl(crc, data, len); | |
44 | kernel_fpu_end(); | |
45 | } else | |
46 | - *(__u16 *)out = crc_t10dif_generic(*crcp, data, len); | |
47 | + *(__u16 *)out = crc_t10dif_generic(crc, data, len); | |
48 | return 0; | |
49 | } | |
50 | ||
51 | @@ -93,15 +92,13 @@ static int chksum_finup(struct shash_des | |
52 | { | |
53 | struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); | |
54 | ||
55 | - return __chksum_finup(&ctx->crc, data, len, out); | |
56 | + return __chksum_finup(ctx->crc, data, len, out); | |
57 | } | |
58 | ||
59 | static int chksum_digest(struct shash_desc *desc, const u8 *data, | |
60 | unsigned int length, u8 *out) | |
61 | { | |
62 | - struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); | |
63 | - | |
64 | - return __chksum_finup(&ctx->crc, data, length, out); | |
65 | + return __chksum_finup(0, data, length, out); | |
66 | } | |
67 | ||
68 | static struct shash_alg alg = { |