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: <20240930024115.52841-1-chenyuan_fl@163.com>
Date: Mon, 30 Sep 2024 10:41:15 +0800
From: Yuan Chen <chenyuan_fl@....com>
To: ast@...nel.org,
	andrii@...nel.org
Cc: netdev@...r.kernel.org,
	bpf@...r.kernel.org
Subject: [v2] bpf: fix the xdp_adjust_tail sample prog issue

From: Yuan Chen <chenyuan@...inos.cn>

During the xdp_adjust_tail test, probabilistic failure occurs and SKB package
is discarded by the kernel. After checking the issues by tracking SKB package,
it is identified that they were caused by checksum errors. Refer to checksum
of the arch/arm64/include/asm/checksum.h for fixing.

v2: Based on Alexei Starovoitov's suggestions, it is necessary to keep the code
 implementation consistent.

Fixes: c6ffd1ff7856 (bpf: add bpf_xdp_adjust_tail sample prog)
Signed-off-by: Yuan Chen <chenyuan@...inos.cn>
---
 samples/bpf/xdp_adjust_tail_kern.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/samples/bpf/xdp_adjust_tail_kern.c b/samples/bpf/xdp_adjust_tail_kern.c
index ffdd548627f0..da67bcad1c63 100644
--- a/samples/bpf/xdp_adjust_tail_kern.c
+++ b/samples/bpf/xdp_adjust_tail_kern.c
@@ -57,6 +57,7 @@ static __always_inline void swap_mac(void *data, struct ethhdr *orig_eth)
 
 static __always_inline __u16 csum_fold_helper(__u32 csum)
 {
+	csum = (csum & 0xffff) + (csum >> 16);
 	return ~((csum & 0xffff) + (csum >> 16));
 }
 
-- 
2.46.0


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ