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authorSteffen Klassert <steffen.klassert@secunet.com>2017-12-08 08:07:25 +0100
committerSteffen Klassert <steffen.klassert@secunet.com>2017-12-08 08:07:25 +0100
commit732706afe1cc46ef48493b3d2b69c98f36314ae4 (patch)
tree9862688f43523d06e45403a51fa5b1b2ac09e02f /net/xfrm
parent75bf50f4aaa1c78d769d854ab3d975884909e4fb (diff)
downloadlinux-732706afe1cc46ef48493b3d2b69c98f36314ae4.tar.bz2
xfrm: Fix stack-out-of-bounds with misconfigured transport mode policies.
On policies with a transport mode template, we pass the addresses from the flowi to xfrm_state_find(), assuming that the IP addresses (and address family) don't change during transformation. Unfortunately our policy template validation is not strict enough. It is possible to configure policies with transport mode template where the address family of the template does not match the selectors address family. This lead to stack-out-of-bound reads because we compare arddesses of the wrong family. Fix this by refusing such a configuration, address family can not change on transport mode. We use the assumption that, on transport mode, the first templates address family must match the address family of the policy selector. Subsequent transport mode templates must mach the address family of the previous template. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm')
-rw-r--r--net/xfrm/xfrm_user.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index ff58c37469d6..bdb48e5dba04 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1419,11 +1419,14 @@ static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
{
+ u16 prev_family;
int i;
if (nr > XFRM_MAX_DEPTH)
return -EINVAL;
+ prev_family = family;
+
for (i = 0; i < nr; i++) {
/* We never validated the ut->family value, so many
* applications simply leave it at zero. The check was
@@ -1435,6 +1438,12 @@ static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
if (!ut[i].family)
ut[i].family = family;
+ if ((ut[i].mode == XFRM_MODE_TRANSPORT) &&
+ (ut[i].family != prev_family))
+ return -EINVAL;
+
+ prev_family = ut[i].family;
+
switch (ut[i].family) {
case AF_INET:
break;