mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-12-23 22:49:28 -05:00
91 lines
2.8 KiB
Diff
91 lines
2.8 KiB
Diff
|
From 05ab8f2647e4221cbdb3856dd7d32bd5407316b3 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Mathias Krause <minipli@googlemail.com>
|
||
|
|
Date: Sun, 13 Apr 2014 18:23:33 +0200
|
||
|
|
Subject: filter: prevent nla extensions to peek beyond the end of the message
|
||
|
|
|
||
|
|
The BPF_S_ANC_NLATTR and BPF_S_ANC_NLATTR_NEST extensions fail to check
|
||
|
|
for a minimal message length before testing the supplied offset to be
|
||
|
|
within the bounds of the message. This allows the subtraction of the nla
|
||
|
|
header to underflow and therefore -- as the data type is unsigned --
|
||
|
|
allowing far to big offset and length values for the search of the
|
||
|
|
netlink attribute.
|
||
|
|
|
||
|
|
The remainder calculation for the BPF_S_ANC_NLATTR_NEST extension is
|
||
|
|
also wrong. It has the minuend and subtrahend mixed up, therefore
|
||
|
|
calculates a huge length value, allowing to overrun the end of the
|
||
|
|
message while looking for the netlink attribute.
|
||
|
|
|
||
|
|
The following three BPF snippets will trigger the bugs when attached to
|
||
|
|
a UNIX datagram socket and parsing a message with length 1, 2 or 3.
|
||
|
|
|
||
|
|
,-[ PoC for missing size check in BPF_S_ANC_NLATTR ]--
|
||
|
|
| ld #0x87654321
|
||
|
|
| ldx #42
|
||
|
|
| ld #nla
|
||
|
|
| ret a
|
||
|
|
`---
|
||
|
|
|
||
|
|
,-[ PoC for the same bug in BPF_S_ANC_NLATTR_NEST ]--
|
||
|
|
| ld #0x87654321
|
||
|
|
| ldx #42
|
||
|
|
| ld #nlan
|
||
|
|
| ret a
|
||
|
|
`---
|
||
|
|
|
||
|
|
,-[ PoC for wrong remainder calculation in BPF_S_ANC_NLATTR_NEST ]--
|
||
|
|
| ; (needs a fake netlink header at offset 0)
|
||
|
|
| ld #0
|
||
|
|
| ldx #42
|
||
|
|
| ld #nlan
|
||
|
|
| ret a
|
||
|
|
`---
|
||
|
|
|
||
|
|
Fix the first issue by ensuring the message length fulfills the minimal
|
||
|
|
size constrains of a nla header. Fix the second bug by getting the math
|
||
|
|
for the remainder calculation right.
|
||
|
|
|
||
|
|
Fixes: 4738c1db15 ("[SKFILTER]: Add SKF_ADF_NLATTR instruction")
|
||
|
|
Fixes: d214c7537b ("filter: add SKF_AD_NLATTR_NEST to look for nested..")
|
||
|
|
Cc: Patrick McHardy <kaber@trash.net>
|
||
|
|
Cc: Pablo Neira Ayuso <pablo@netfilter.org>
|
||
|
|
Signed-off-by: Mathias Krause <minipli@googlemail.com>
|
||
|
|
Acked-by: Daniel Borkmann <dborkman@redhat.com>
|
||
|
|
Signed-off-by: David S. Miller <davem@davemloft.net>
|
||
|
|
---
|
||
|
|
net/core/filter.c | 8 +++++++-
|
||
|
|
1 file changed, 7 insertions(+), 1 deletion(-)
|
||
|
|
|
||
|
|
diff --git a/net/core/filter.c b/net/core/filter.c
|
||
|
|
index e08b382..0e0856f 100644
|
||
|
|
--- a/net/core/filter.c
|
||
|
|
+++ b/net/core/filter.c
|
||
|
|
@@ -600,6 +600,9 @@ static u64 __skb_get_nlattr(u64 ctx, u64 A, u64 X, u64 r4, u64 r5)
|
||
|
|
if (skb_is_nonlinear(skb))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
+ if (skb->len < sizeof(struct nlattr))
|
||
|
|
+ return 0;
|
||
|
|
+
|
||
|
|
if (A > skb->len - sizeof(struct nlattr))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
@@ -618,11 +621,14 @@ static u64 __skb_get_nlattr_nest(u64 ctx, u64 A, u64 X, u64 r4, u64 r5)
|
||
|
|
if (skb_is_nonlinear(skb))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
+ if (skb->len < sizeof(struct nlattr))
|
||
|
|
+ return 0;
|
||
|
|
+
|
||
|
|
if (A > skb->len - sizeof(struct nlattr))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
nla = (struct nlattr *) &skb->data[A];
|
||
|
|
- if (nla->nla_len > A - skb->len)
|
||
|
|
+ if (nla->nla_len > skb->len - A)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
nla = nla_find_nested(nla, X);
|
||
|
|
--
|
||
|
|
cgit v1.1
|
||
|
|
|