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authorKees Cook <keescook@chromium.org>2018-03-30 19:55:44 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2018-04-20 19:58:29 +0300
commitd5c3b17898993c3461fb3f0497f45098ffd72ac6 (patch)
tree8918812280a8d42919dd3cef54dc22aa80cc4bc1 /crypto/ecdh.c
parent3a488aaec6f343b5dc6d94529847a840bbeaf009 (diff)
downloadlinux-d5c3b17898993c3461fb3f0497f45098ffd72ac6.tar.xz
crypto: ecc - Actually remove stack VLA usage
On the quest to remove all VLAs from the kernel[1], this avoids VLAs by just using the maximum allocation size (4 bytes) for stack arrays. All the VLAs in ecc were either 3 or 4 bytes (or a multiple), so just make it 4 bytes all the time. Initialization routines are adjusted to check that ndigits does not end up larger than the arrays. This includes a removal of the earlier attempt at this fix from commit a963834b4742 ("crypto/ecc: Remove stack VLA usage") [1] https://lkml.org/lkml/2018/3/7/621 Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/ecdh.c')
-rw-r--r--crypto/ecdh.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/crypto/ecdh.c b/crypto/ecdh.c
index d2ec33f0e098..bf6300175b9c 100644
--- a/crypto/ecdh.c
+++ b/crypto/ecdh.c
@@ -30,8 +30,8 @@ static inline struct ecdh_ctx *ecdh_get_ctx(struct crypto_kpp *tfm)
static unsigned int ecdh_supported_curve(unsigned int curve_id)
{
switch (curve_id) {
- case ECC_CURVE_NIST_P192: return 3;
- case ECC_CURVE_NIST_P256: return 4;
+ case ECC_CURVE_NIST_P192: return ECC_CURVE_NIST_P192_DIGITS;
+ case ECC_CURVE_NIST_P256: return ECC_CURVE_NIST_P256_DIGITS;
default: return 0;
}
}