netdev - [PATCH bpf 1/2] bpf: pull before calling skb_postpull

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20221220004701.402165-1-kuba@kernel.org>
Date:   Mon, 19 Dec 2022 16:47:00 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     daniel@...earbox.net
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>,
        Anand Parthasarathy <anpartha@...a.com>, martin.lau@...ux.dev,
        song@...nel.org, john.fastabend@...il.com, sdf@...gle.com
Subject: [PATCH bpf 1/2] bpf: pull before calling skb_postpull_rcsum()

Anand hit a BUG() when pulling off headers on egress to a SW tunnel.
We get to skb_checksum_help() with an invalid checksum offset
(commit d7ea0d9df2a6 ("net: remove two BUG() from skb_checksum_help()")
converted those BUGs to WARN_ONs()).
He points out oddness in how skb_postpull_rcsum() gets used.
Indeed looks like we should pull before "postpull", otherwise
the CHECKSUM_PARTIAL fixup from skb_postpull_rcsum() will not
be able to do its job:

	if (skb->ip_summed == CHECKSUM_PARTIAL &&
	    skb_checksum_start_offset(skb) < 0)
		skb->ip_summed = CHECKSUM_NONE;

Reported-by: Anand Parthasarathy <anpartha@...a.com>
Fixes: 6578171a7ff0 ("bpf: add bpf_skb_change_proto helper")
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: daniel@...earbox.net
CC: martin.lau@...ux.dev
CC: song@...nel.org
CC: john.fastabend@...il.com
CC: sdf@...gle.com
CC: bpf@...r.kernel.org
---
 net/core/filter.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/core/filter.c b/net/core/filter.c
index 929358677183..43cc1fe58a2c 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -3180,15 +3180,18 @@ static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len)
 
 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len)
 {
+	void *old_data;
+
 	/* skb_ensure_writable() is not needed here, as we're
 	 * already working on an uncloned skb.
 	 */
 	if (unlikely(!pskb_may_pull(skb, off + len)))
 		return -ENOMEM;
 
-	skb_postpull_rcsum(skb, skb->data + off, len);
-	memmove(skb->data + len, skb->data, off);
+	old_data = skb->data;
 	__skb_pull(skb, len);
+	skb_postpull_rcsum(skb, old_data + off, len);
+	memmove(skb->data, old_data, off);
 
 	return 0;
 }
-- 
2.38.1