Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Pull s390 updates from Martin Schwidefsky:

 - The remaining patches for the z13 machine support: kernel build
   option for z13, the cache synonym avoidance, SMT support,
   compare-and-delay for spinloops and the CES5S crypto adapater.

 - The ftrace support for function tracing with the gcc hotpatch option.
   This touches common code Makefiles, Steven is ok with the changes.

 - The hypfs file system gets an extension to access diagnose 0x0c data
   in user space for performance analysis for Linux running under z/VM.

 - The iucv hvc console gets wildcard spport for the user id filtering.

 - The cacheinfo code is converted to use the generic infrastructure.

 - Cleanup and bug fixes.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (42 commits)
  s390/process: free vx save area when releasing tasks
  s390/hypfs: Eliminate hypfs interval
  s390/hypfs: Add diagnose 0c support
  s390/cacheinfo: don't use smp_processor_id() in preemptible context
  s390/zcrypt: fixed domain scanning problem (again)
  s390/smp: increase maximum value of NR_CPUS to 512
  s390/jump label: use different nop instruction
  s390/jump label: add sanity checks
  s390/mm: correct missing space when reporting user process faults
  s390/dasd: cleanup profiling
  s390/dasd: add locking for global_profile access
  s390/ftrace: hotpatch support for function tracing
  ftrace: let notrace function attribute disable hotpatching if necessary
  ftrace: allow architectures to specify ftrace compile options
  s390: reintroduce diag 44 calls for cpu_relax()
  s390/zcrypt: Add support for new crypto express (CEX5S) adapter.
  s390/zcrypt: Number of supported ap domains is not retrievable.
  s390/spinlock: add compare-and-delay to lock wait loops
  s390/tape: remove redundant if statement
  s390/hvc_iucv: add simple wildcard matches to the iucv allow filter
  ...

1 files changed, 24 insertions, 7 deletions

diff --git a/drivers/tty/hvc/hvc_iucv.c b/drivers/tty/hvc/hvc_iucv.c
index ea74460f3638..f78a87b07872 100644
--- a/drivers/tty/hvc/hvc_iucv.c
+++ b/drivers/tty/hvc/hvc_iucv.c
@@ -1,10 +1,10 @@
 /*
- * hvc_iucv.c - z/VM IUCV hypervisor console (HVC) device driver
+ * z/VM IUCV hypervisor console (HVC) device driver
  *
  * This HVC device driver provides terminal access using
  * z/VM IUCV communication paths.
  *
- * Copyright IBM Corp. 2008, 2009
+ * Copyright IBM Corp. 2008, 2013
  *
  * Author(s):	Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
  */
@@ -102,6 +102,7 @@ static struct hvc_iucv_private *hvc_iucv_table[MAX_HVC_IUCV_LINES];
 #define IUCV_HVC_CON_IDX	(0)
 /* List of z/VM user ID filter entries (struct iucv_vmid_filter) */
 #define MAX_VMID_FILTER		(500)
+#define FILTER_WILDCARD_CHAR	'*'
 static size_t hvc_iucv_filter_size;
 static void *hvc_iucv_filter;
 static const char *hvc_iucv_filter_string;
@@ -734,20 +735,31 @@ static void hvc_iucv_notifier_del(struct hvc_struct *hp, int id)
  * hvc_iucv_filter_connreq() - Filter connection request based on z/VM user ID
  * @ipvmid:	Originating z/VM user ID (right padded with blanks)
  *
- * Returns 0 if the z/VM user ID @ipvmid is allowed to connection, otherwise
- * non-zero.
+ * Returns 0 if the z/VM user ID that is specified with @ipvmid is permitted to
+ * connect, otherwise non-zero.
  */
 static int hvc_iucv_filter_connreq(u8 ipvmid[8])
 {
-	size_t i;
+	const char *wildcard, *filter_entry;
+	size_t i, len;
 
 	/* Note: default policy is ACCEPT if no filter is set */
 	if (!hvc_iucv_filter_size)
 		return 0;
 
-	for (i = 0; i < hvc_iucv_filter_size; i++)
-		if (0 == memcmp(ipvmid, hvc_iucv_filter + (8 * i), 8))
+	for (i = 0; i < hvc_iucv_filter_size; i++) {
+		filter_entry = hvc_iucv_filter + (8 * i);
+
+		/* If a filter entry contains the filter wildcard character,
+		 * reduce the length to match the leading portion of the user
+		 * ID only (wildcard match).  Characters following the wildcard
+		 * are ignored.
+		 */
+		wildcard = strnchr(filter_entry, 8, FILTER_WILDCARD_CHAR);
+		len = (wildcard) ? wildcard - filter_entry : 8;
+		if (0 == memcmp(ipvmid, filter_entry, len))
 			return 0;
+	}
 	return 1;
 }
 
@@ -1166,6 +1178,7 @@ static void __init hvc_iucv_destroy(struct hvc_iucv_private *priv)
 /**
  * hvc_iucv_parse_filter() - Parse filter for a single z/VM user ID
  * @filter:	String containing a comma-separated list of z/VM user IDs
+ * @dest:	Location where to store the parsed z/VM user ID
  */
 static const char *hvc_iucv_parse_filter(const char *filter, char *dest)
 {
@@ -1188,6 +1201,10 @@ static const char *hvc_iucv_parse_filter(const char *filter, char *dest)
 	if (filter[len - 1] == '\n')
 		len--;
 
+	/* prohibit filter entries containing the wildcard character only */
+	if (len == 1 && *filter == FILTER_WILDCARD_CHAR)
+		return ERR_PTR(-EINVAL);
+
 	if (len > 8)
 		return ERR_PTR(-EINVAL);