From 2fca489d58acfee297d0b9a7dc14e7fa119e8867 Mon Sep 17 00:00:00 2001 From: Fan Zhang Date: Thu, 16 Apr 2020 11:29:06 +0100 Subject: [PATCH 5/6] vhost/crypto: fix data length check This patch fixes the incorrect data length check to vhost crypto. Instead of blindly accepting the descriptor length as data length, the change compare the request provided data length and descriptor length first. The security issue CVE-2020-14374 is not fixed alone by this patch, part of the fix is done through: "vhost/crypto: fix missed request check for copy mode". CVE-2020-14374 Fixes: 3c79609fda7c ("vhost/crypto: handle virtually non-contiguous buffers") Cc: stable@dpdk.org Signed-off-by: Fan Zhang Acked-by: Chenbo Xia --- lib/librte_vhost/vhost_crypto.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/librte_vhost/vhost_crypto.c b/lib/librte_vhost/vhost_crypto.c index f1cc32a9b..cf9aa2566 100644 --- a/lib/librte_vhost/vhost_crypto.c +++ b/lib/librte_vhost/vhost_crypto.c @@ -624,7 +624,7 @@ copy_data(void *dst_data, struct vhost_crypto_data_req *vc_req, desc = &vc_req->head[desc->next]; rte_prefetch0(&vc_req->head[desc->next]); to_copy = RTE_MIN(desc->len, (uint32_t)left); - dlen = desc->len; + dlen = to_copy; src = IOVA_TO_VVA(uint8_t *, vc_req, desc->addr, &dlen, VHOST_ACCESS_RO); if (unlikely(!src || !dlen)) { -- 2.26.2