[Bug network/19622] New: Support aliasing with struct sockaddr

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19622

            Bug ID: 19622
           Summary: Support aliasing with struct sockaddr
           Product: glibc
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
             Flags: security-

It is quite common to pass pointers to struct sockaddr_in and similar socket
structures to as struct sockaddr pointers, or to peak at a socket address
through a struct sockaddr pointer to look at the sa_family member to determine
the concrete socket address type.

This breaks strict aliasing.  Marek Polacek suggests to add the may_alias
attribute to struct sockaddr.

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