linux-kernel - [PATCH v2 2/7] lib/mpi: use kcalloc in mpi

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Date:   Thu, 27 May 2021 21:53:30 +0800
From:   Hongbo Li <herbert.tencent@...il.com>
To:     keyrings@...r.kernel.org, linux-crypto@...r.kernel.org,
        herbert@...dor.apana.org.au, ebiggers@...nel.org,
        dhowells@...hat.com, jarkko@...nel.org,
        tianjia.zhang@...ux.alibaba.com, herberthbli@...cent.com
Cc:     linux-kernel@...r.kernel.org, linux-integrity@...r.kernel.org
Subject: [PATCH v2 2/7] lib/mpi: use kcalloc in mpi_resize

From: Hongbo Li <herberthbli@...cent.com>

We should set the additional space to 0 in mpi_resize().
So use kcalloc() instead of kmalloc_array().

In lib/mpi/ec.c:
/****************
 * Resize the array of A to NLIMBS. the additional space is cleared
 * (set to 0) [done by m_realloc()]
 */
int mpi_resize(MPI a, unsigned nlimbs)

Like the comment of kernel's mpi_resize(), the additional space
need to set to 0, but when a->d is not NULL, it does not set.

The kernel's mpi lib is from libgcrypt, the mpi resize in libgcrypt
is _gcry_mpi_resize() which set the additional space to 0.

This bug may cause mpi api which use mpi_resize() get wrong result
under the condition of using the additional space without initiation.
If this condition is not met, the bug would not be triggered.
Currently in kernel, rsa, sm2 and dh use mpi lib, and they works well,
so the bug is not triggered in these cases. 

add_points_edwards() use the additional space directly, so it will
get a wrong result, and lead to a failed eddsa verification.

Fixes: cdec9cb5167a ("crypto: GnuPG based MPI lib - source files (part 1)")
Signed-off-by: Hongbo Li <herberthbli@...cent.com>
---
 lib/mpi/mpiutil.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/mpi/mpiutil.c b/lib/mpi/mpiutil.c
index 3c63710c20c6..e6c4b3180ab1 100644
--- a/lib/mpi/mpiutil.c
+++ b/lib/mpi/mpiutil.c
@@ -148,7 +148,7 @@ int mpi_resize(MPI a, unsigned nlimbs)
 		return 0;	/* no need to do it */

 	if (a->d) {
-		p = kmalloc_array(nlimbs, sizeof(mpi_limb_t), GFP_KERNEL);
+		p = kcalloc(nlimbs, sizeof(mpi_limb_t), GFP_KERNEL);
 		if (!p)
 			return -ENOMEM;
 		memcpy(p, a->d, a->alloced * sizeof(mpi_limb_t));
-- 
2.27.0