Re: [bpf, xdp] headroom - was: Re: Question about to KMSAN: uninit-value in can_receive

[Jakub Kicinski]

On Fri, 2 Jan 2026 21:06:11 +0530 Prithvi wrote:
> Just a gentle ping on this thread 

You're asking the wrong person, IIUC Andrii is tangentially involved
in XDP (via bpf links?):

XDP (eXpress Data Path)
M:	Alexei Starovoitov <ast@xxxxxxxxxx>
M:	Daniel Borkmann <daniel@xxxxxxxxxxxxx>
M:	David S. Miller <davem@xxxxxxxxxxxxx>
M:	Jakub Kicinski <kuba@xxxxxxxxxx>
M:	Jesper Dangaard Brouer <hawk@xxxxxxxxxx>
M:	John Fastabend <john.fastabend@xxxxxxxxx>
R:	Stanislav Fomichev <sdf@xxxxxxxxxxx>
L:	netdev@xxxxxxxxxxxxxxx
L:	bpf@xxxxxxxxxxxxxxx

Without looking too deeply - XDP has historically left the new space
uninitialized after push, expecting programs to immediately write the
headers in that space. syzbot had run into this in the past but I can't
find any references to past threads quickly :(