From 9515f43ddd006464308b2796b63b7d6446d922b8 Mon Sep 17 00:00:00 2001 From: Elena Reshetova Date: Wed, 13 Dec 2017 10:16:07 +0200 Subject: [PATCH 150/194] ipv4: prevent speculative execution Since the offset value in function raw_getfrag() seems to be controllable by userspace and later on conditionally (upon bound check) used in the following memcpy, insert an observable speculation barrier before its usage. This should prevent observable speculation on that branch and avoid kernel memory leak. Signed-off-by: Elena Reshetova --- net/ipv4/raw.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c index 33b70bf..c9d33f1 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -476,6 +476,7 @@ static int raw_getfrag(void *from, char *to, int offset, int len, int odd, if (offset < rfv->hlen) { int copy = min(rfv->hlen - offset, len); + osb(); if (skb->ip_summed == CHECKSUM_PARTIAL) memcpy(to, rfv->hdr.c + offset, copy); else -- 2.9.5