leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

xfrm: Validate address prefix lengths in the xfrm selector.

Browse Source 
We don't validate the address prefix lengths in the xfrm
selector we got from userspace. This can lead to undefined
behaviour in the address matching functions if the prefix
is too big for the given address family. Fix this by checking
the prefixes and refuse SA/policy insertation when a prefix
is invalid.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Reported-by: Air Icy <icytxw@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2018-08-01 13:45:11 +02:00
parent 25432eba9c
commit 07bf790895
1 changed files with 12 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
net/xfrm/xfrm_user.c
View File

@ -151,10 +151,16 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
err = -EINVAL;
switch (p->family) {
case AF_INET:
if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
goto out;
break;
case AF_INET6:
#if IS_ENABLED(CONFIG_IPV6)
if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
goto out;
break;
#else
err = -EAFNOSUPPORT;
@ -1359,10 +1365,16 @@ static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
switch (p->sel.family) {
case AF_INET:
if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
return -EINVAL;
break;
case AF_INET6:
#if IS_ENABLED(CONFIG_IPV6)
if (p->sel.prefixlen_d > 128 || p->sel.prefixlen_s > 128)
return -EINVAL;
break;
#else
return -EAFNOSUPPORT;