Make closefrom() ignore softlinks to the /dev/ devices on s390

openssh-7.2p2-s390-closefrom.patch

@@ -0,0 +1,52 @@
+Zseries only: Leave the hardware filedescriptors open.
+
+All filedescriptors above 2 are getting closed when a new
+sshd process to handle a new client connection is
+spawned. As the process also chroot into an empty filesystem
+without any device nodes, there is no chance to reopen the
+files. This patch filters out the reqired fds in the
+closefrom function so these are skipped in the close loop.
+
+Author: Harald Freudenberger <freude@de.ibm.com>
+
+---
+ openbsd-compat/bsd-closefrom.c |   26 ++++++++++++++++++++++++++
+ 1 file changed, 26 insertions(+)
+
+--- a/openbsd-compat/bsd-closefrom.c
++++ b/openbsd-compat/bsd-closefrom.c
+@@ -82,7 +82,33 @@ closefrom(int lowfd)
+ 	    fd = strtol(dent->d_name, &endp, 10);
+ 	    if (dent->d_name != endp && *endp == '\0' &&
+ 		fd >= 0 && fd < INT_MAX && fd >= lowfd && fd != dirfd(dirp))
++#ifdef __s390__
++		{
++		    /*
++		     * the filedescriptors used to communicate with
++		     * the device drivers to provide hardware support
++		     * should survive. HF <freude@de.ibm.com>
++		     */
++		    char fpath[PATH_MAX], lpath[PATH_MAX];
++		    len = snprintf(fpath, sizeof(fpath), "%s/%s",
++				   fdpath, dent->d_name);
++		    if (len > 0 && (size_t)len <= sizeof(fpath)) {
++			len = readlink(fpath, lpath, sizeof(lpath));
++			if (len > 0) {
++			    lpath[len] = 0;
++			    if (strstr(lpath, "dev/z90crypt")
++				|| strstr(lpath, "dev/zcrypt")
++				|| strstr(lpath, "dev/prandom")
++				|| strstr(lpath, "dev/shm/icastats"))
++				fd = -1;
++			}
++		    }
++		    if (fd >= 0)
++			(void) close((int) fd);
++		}
++#else
+ 		(void) close((int) fd);
++#endif
+ 	}
+ 	(void) closedir(dirp);
+     } else
+

openssh.spec

@@ -236,6 +236,8 @@ Patch936: openssh-7.1p1-iutf8.patch
 Patch937: openssh-7.2p2-CVE-2015-8325.patch
 # Regression in certificate based authentication (#1333498)
 Patch938: openssh-7.2p2-certificats-regress.patch
+# make s390 use /dev/ crypto devices -- ignore closefrom
+Patch939: openssh-7.2p2-s390-closefrom.patch
 
 
 License: BSD
@@ -473,6 +475,7 @@ popd
 %patch936 -p1 -b .iutf8
 %patch937 -p1 -b .pam_uselogin_cve
 %patch938 -p1 -b .certificates
+%patch939 -p1 -b .s390-dev
 
 %patch200 -p1 -b .audit
 %patch201 -p1 -b .audit-race