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xfrm: validate new SA's prefixlen using SA family when sel.family is unset

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This expands the validation introduced in commit 07bf790895 ("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@syzkaller.appspotmail.com
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Sabrina Dubroca 2024-10-01 18:48:14 +02:00 committed by Steffen Klassert
parent 645546a05b
commit 3f0ab59e65
1 changed files with 5 additions and 1 deletions
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6
net/xfrm/xfrm_user.c
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@ -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;