CVE Request: Linux Kernel: information leak from getsockname

[Marcus Meissner <meissner () suse de>]

Hi,

spotted by grsecurity
https://twitter.com/grsecurity/status/676744240802750464

https://lkml.org/lkml/2015/12/14/252
http://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=09ccfd238e5a0e670d8178cf50180ea81ae09ae1

getsockname() for some socket families did not check the length of the passed sockaddr,
copying out more kernel memory than required, leaking information from the kernel stack,
including kernel addresses. This can be used for KASLR bypass or other information leaks. 

Ciao, Marcus