This is a note to let you know that I've just added the patch titled
xfrm: validate new SA's prefixlen using SA family when sel.family is unset
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xfrm-validate-new-sa-s-prefixlen-using-sa-family-whe.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2509ee204c957aeb677d90083f814e8963ca813e
Author: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
Date: Tue Oct 1 18:48:14 2024 +0200
xfrm: validate new SA's prefixlen using SA family when sel.family is unset
[ Upstream commit 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 ]
This expands the validation introduced in commit 07bf7908950a ("xfrm:
Validate address prefix lengths in the xfrm selector.")
syzbot created an SA with
usersa.sel.family = AF_UNSPEC
usersa.sel.prefixlen_s = 128
usersa.family = AF_INET
Because of the AF_UNSPEC selector, verify_newsa_info doesn't put
limits on prefixlen_{s,d}. But then copy_from_user_state sets
x->sel.family to usersa.family (AF_INET). Do the same conversion in
verify_newsa_info before validating prefixlen_{s,d}, since that's how
prefixlen is going to be used later on.
Reported-by: syzbot+cc39f136925517aed571@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 4328e81ea6a31..12e9d0e703e70 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -201,6 +201,7 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
{
int err;
u8 sa_dir = attrs[XFRMA_SA_DIR] ? nla_get_u8(attrs[XFRMA_SA_DIR]) : 0;
+ u16 family = p->sel.family;
err = -EINVAL;
switch (p->family) {
@@ -221,7 +222,10 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
goto out;
}
- switch (p->sel.family) {
+ if (!family && !(p->flags & XFRM_STATE_AF_UNSPEC))
+ family = p->family;
+
+ switch (family) {
case AF_UNSPEC:
break;
