svn commit: r342864 - head/sys/compat/linux

[Mark Johnston]

Author: markj
Date: Tue Jan  8 17:21:59 2019
New Revision: 342864
URL: https://svnweb.freebsd.org/changeset/base/342864

Log:
  Specify the correct option level when emulating SO_PEERCRED.
  
  Our equivalent to SO_PEERCRED, LOCAL_PEERCRED, is implemented at
  socket option level 0, not SOL_SOCKET.
  
  PR:		234722
  Submitted by:	Dániel Bakai <bakaidl at gmail.com>
  MFC after:	2 weeks

Modified:
  head/sys/compat/linux/linux_socket.c

Modified: head/sys/compat/linux/linux_socket.c
==============================================================================
--- head/sys/compat/linux/linux_socket.c	Tue Jan  8 17:08:10 2019	(r342863)
+++ head/sys/compat/linux/linux_socket.c	Tue Jan  8 17:21:59 2019	(r342864)
@@ -1633,6 +1633,11 @@ linux_getsockopt(struct thread *td, struct linux_getso
 		case LOCAL_PEERCRED:
 			if (args->optlen < sizeof(lxu))
 				return (EINVAL);
+			/*
+			 * LOCAL_PEERCRED is not served at the SOL_SOCKET level,
+			 * but by the Unix socket's level 0.
+			 */
+			bsd_args.level = 0;
 			xulen = sizeof(xu);
 			error = kern_getsockopt(td, args->s, bsd_args.level,
 			    name, &xu, UIO_SYSSPACE, &xulen);