Hello: This patch was applied to netdev/net.git (main) by Jakub Kicinski <kuba@xxxxxxxxxx>: On Fri, 28 Feb 2025 22:14:08 +0800 you wrote: > Syzbot caught an "KMSAN: uninit-value" warning [1], which is caused by the > ppp driver not initializing a 2-byte header when using socket filter. > > The following code can generate a PPP filter BPF program: > ''' > struct bpf_program fp; > pcap_t *handle; > handle = pcap_open_dead(DLT_PPP_PPPD, 65535); > pcap_compile(handle, &fp, "ip and outbound", 0, 0); > bpf_dump(&fp, 1); > ''' > Its output is: > ''' > (000) ldh [2] > (001) jeq #0x21 jt 2 jf 5 > (002) ldb [0] > (003) jeq #0x1 jt 4 jf 5 > (004) ret #65535 > (005) ret #0 > ''' > Wen can find similar code at the following link: > https://github.com/ppp-project/ppp/blob/master/pppd/options.c#L1680 > The maintainer of this code repository is also the original maintainer > of the ppp driver. > > [...] Here is the summary with links: - [net-next,v5] ppp: Fix KMSAN uninit-value warning with bpf https://git.kernel.org/netdev/net/c/4c2d14c40a68 You are awesome, thank you! -- Deet-doot-dot, I am a bot. https://korg.docs.kernel.org/patchwork/pwbot.html
