coredump: set the minimum send buffer size

The send buffer of the coredump socket is subject to the limit in
net.core.wmem_default. af_unix uses sk_sndbuf / 2 - 64 bytes for a
single skb. That means a send buffer below that would split a page-sized
write into multiple skbs. Raise the send buffer to leave room for a
page-sized write plus the header. The default value is well above that.
So we really change it when it's below our minimum.

Link: https://patch.msgid.link/20260820-work-coredump-sparse-v2-3-ba32dd718c51@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

0 files changed, 0 insertions, 0 deletions