This is a note to let you know that I've just added the patch titled
crypto: ecc - Prevent ecc_digits_from_bytes from reading too many bytes
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
crypto-ecc-prevent-ecc_digits_from_bytes-from-readin.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 18bafd95480493a14aa3c863daf98b98f5030da3
Author: Stefan Berger <stefanb@xxxxxxxxxxxxx>
Date: Thu May 9 21:59:21 2024 -0400
crypto: ecc - Prevent ecc_digits_from_bytes from reading too many bytes
[ Upstream commit c6ab5c915da460c0397960af3c308386c3f3247b ]
Prevent ecc_digits_from_bytes from reading too many bytes from the input
byte array in case an insufficient number of bytes is provided to fill the
output digit array of ndigits. Therefore, initialize the most significant
digits with 0 to avoid trying to read too many bytes later on. Convert the
function into a regular function since it is getting too big for an inline
function.
If too many bytes are provided on the input byte array the extra bytes
are ignored since the input variable 'ndigits' limits the number of digits
that will be filled.
Fixes: d67c96fb97b5 ("crypto: ecdsa - Convert byte arrays with key coordinates to digits")
Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/crypto/ecc.c b/crypto/ecc.c
index f53fb4d6af99..21504280aca2 100644
--- a/crypto/ecc.c
+++ b/crypto/ecc.c
@@ -66,6 +66,28 @@ const struct ecc_curve *ecc_get_curve(unsigned int curve_id)
}
EXPORT_SYMBOL(ecc_get_curve);
+void ecc_digits_from_bytes(const u8 *in, unsigned int nbytes,
+ u64 *out, unsigned int ndigits)
+{
+ int diff = ndigits - DIV_ROUND_UP(nbytes, sizeof(u64));
+ unsigned int o = nbytes & 7;
+ __be64 msd = 0;
+
+ /* diff > 0: not enough input bytes: set most significant digits to 0 */
+ if (diff > 0) {
+ ndigits -= diff;
+ memset(&out[ndigits - 1], 0, diff * sizeof(u64));
+ }
+
+ if (o) {
+ memcpy((u8 *)&msd + sizeof(msd) - o, in, o);
+ out[--ndigits] = be64_to_cpu(msd);
+ in += o;
+ }
+ ecc_swap_digits(in, out, ndigits);
+}
+EXPORT_SYMBOL(ecc_digits_from_bytes);
+
static u64 *ecc_alloc_digits_space(unsigned int ndigits)
{
size_t len = ndigits * sizeof(u64);
diff --git a/include/crypto/internal/ecc.h b/include/crypto/internal/ecc.h
index ab722a8986b7..c0b8be63cbde 100644
--- a/include/crypto/internal/ecc.h
+++ b/include/crypto/internal/ecc.h
@@ -63,19 +63,8 @@ static inline void ecc_swap_digits(const void *in, u64 *out, unsigned int ndigit
* @out Output digits array
* @ndigits: Number of digits to create from byte array
*/
-static inline void ecc_digits_from_bytes(const u8 *in, unsigned int nbytes,
- u64 *out, unsigned int ndigits)
-{
- unsigned int o = nbytes & 7;
- __be64 msd = 0;
-
- if (o) {
- memcpy((u8 *)&msd + sizeof(msd) - o, in, o);
- out[--ndigits] = be64_to_cpu(msd);
- in += o;
- }
- ecc_swap_digits(in, out, ndigits);
-}
+void ecc_digits_from_bytes(const u8 *in, unsigned int nbytes,
+ u64 *out, unsigned int ndigits);
/**
* ecc_is_key_valid() - Validate a given ECDH private key
