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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/ecc.h
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/ecc.h')
-rw-r--r--crypto/ecc.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/crypto/ecc.h b/crypto/ecc.h
index e4fd4492c765..f75a86baa3bd 100644
--- a/crypto/ecc.h
+++ b/crypto/ecc.h
@@ -26,7 +26,9 @@
#ifndef _CRYPTO_ECC_H
#define _CRYPTO_ECC_H
-#define ECC_MAX_DIGITS 4 /* 256 */
+#define ECC_CURVE_NIST_P192_DIGITS 3
+#define ECC_CURVE_NIST_P256_DIGITS 4
+#define ECC_MAX_DIGITS ECC_CURVE_NIST_P256_DIGITS
#define ECC_DIGITS_TO_BYTES_SHIFT 3