On 8/15/20 11:23 AM, Pascal Bouchareine wrote:

This command attaches the zero terminated string in optval to the
socket for troubleshooting purposes. The free string is displayed in the
process fdinfo file for that fd (/proc/<pid>/fdinfo/<fd>).

One intended usage is to allow processes to self-document sockets
for netstat and friends to report

We ignore optlen and constrain the string to a static max size

1) You also ignored what would happen at accept() time.

Please test your patches with ASAN.

2) Also, why is that description specific to sockets ?

3) When a new socket option is added, it is customary to implement both setsockopt() and getsockopt()
  for things like CRIU.