[kernel] r22873 - in dists/trunk/linux/debian: . patches patches/bugfix/s390

[Ben Hutchings]

Author: benh
Date: Wed Jul 29 03:28:09 2015
New Revision: 22873

Log:
[s390x] cachinfo: add missing facility check to init_cache_level() (Closes: #793929)

Added:
   dists/trunk/linux/debian/patches/bugfix/s390/s390-cachinfo-add-missing-facility-check-to-init_cache_level.patch
Modified:
   dists/trunk/linux/debian/changelog
   dists/trunk/linux/debian/patches/series

Modified: dists/trunk/linux/debian/changelog
==============================================================================
--- dists/trunk/linux/debian/changelog	Wed Jul 29 03:19:30 2015	(r22872)
+++ dists/trunk/linux/debian/changelog	Wed Jul 29 03:28:09 2015	(r22873)
@@ -13,6 +13,8 @@
     uboot-mkimage package (Closes: #793608)
   * [i386/586] Enable KEYBOARD_GPIO_POLLED and LEDS_GPIO as modules, and
     ALIX, NET5501, GEOS (Closes: #734204)
+  * [s390x] cachinfo: add missing facility check to init_cache_level()
+    (Closes: #793929)
 
   [ Ian Campbell ]
   * [armhf] Set CONFIG_ARM_TEGRA_CPUFREQ as builtin.

Added: dists/trunk/linux/debian/patches/bugfix/s390/s390-cachinfo-add-missing-facility-check-to-init_cache_level.patch
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ dists/trunk/linux/debian/patches/bugfix/s390/s390-cachinfo-add-missing-facility-check-to-init_cache_level.patch	Wed Jul 29 03:28:09 2015	(r22873)
@@ -0,0 +1,51 @@
+From: Heiko Carstens <heiko.carstens at de.ibm.com>
+Date: Mon, 27 Jul 2015 09:53:49 +0200
+Subject: s390/cachinfo: add missing facility check to init_cache_level()
+Origin: https://git.kernel.org/cgit/linux/kernel/git/s390/linux.git/commit/?id=0b991f5cdcd6201e5401f83ca3a672343c3bfc49
+Bug-Debian: https://bugs.debian.org/793929
+
+Stephen Powell reported the following crash on a z890 machine:
+
+Kernel BUG at 00000000001219d0 [verbose debug info unavailable]
+illegal operation: 0001 ilc:3 [#1] SMP
+Krnl PSW : 0704e00180000000 00000000001219d0 (init_cache_level+0x38/0xe0)
+	   R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 EA:3
+Krnl Code: 00000000001219c2: a7840056		brc	8,121a6e
+	   00000000001219c6: a7190000		lghi	%r1,0
+	  #00000000001219ca: eb101000004c	ecag	%r1,%r0,0(%r1)
+	  >00000000001219d0: a7390000		lghi	%r3,0
+	   00000000001219d4: e310f0a00024	stg	%r1,160(%r15)
+	   00000000001219da: a7080000		lhi	%r0,0
+	   00000000001219de: a7b9f000		lghi	%r11,-4096
+	   00000000001219e2: c0a0002899d9	larl	%r10,634d94
+Call Trace:
+ [<0000000000478ee2>] detect_cache_attributes+0x2a/0x2b8
+ [<000000000097c9b0>] cacheinfo_sysfs_init+0x60/0xc8
+ [<00000000001001c0>] do_one_initcall+0x98/0x1c8
+ [<000000000094fdc2>] kernel_init_freeable+0x212/0x2d8
+ [<000000000062352e>] kernel_init+0x26/0x118
+ [<000000000062fd2e>] kernel_thread_starter+0x6/0xc
+
+The illegal operation was executed because of a missing facility check,
+which should have made sure that the ECAG execution would only be executed
+on machines which have the general-instructions-extension facility
+installed.
+
+Reported-and-tested-by: Stephen Powell <zlinuxman at wowway.com>
+Cc: stable at vger.kernel.org # v4.0+
+Signed-off-by: Heiko Carstens <heiko.carstens at de.ibm.com>
+Signed-off-by: Martin Schwidefsky <schwidefsky at de.ibm.com>
+
+diff --git a/arch/s390/kernel/cache.c b/arch/s390/kernel/cache.c
+index bff5e3b..8ba3243 100644
+--- a/arch/s390/kernel/cache.c
++++ b/arch/s390/kernel/cache.c
+@@ -138,6 +138,8 @@ int init_cache_level(unsigned int cpu)
+ 	union cache_topology ct;
+ 	enum cache_type ctype;
+ 
++	if (!test_facility(34))
++		return -EOPNOTSUPP;
+ 	if (!this_cpu_ci)
+ 		return -EINVAL;
+ 	ct.raw = ecag(EXTRACT_TOPOLOGY, 0, 0);

Modified: dists/trunk/linux/debian/patches/series
==============================================================================
--- dists/trunk/linux/debian/patches/series	Wed Jul 29 03:19:30 2015	(r22872)
+++ dists/trunk/linux/debian/patches/series	Wed Jul 29 03:28:09 2015	(r22873)
@@ -88,3 +88,4 @@
 bugfix/x86/0008-x86-nmi-64-Reorder-nested-NMI-checks.patch
 bugfix/x86/0009-x86-nmi-64-Use-DF-to-avoid-userspace-RSP-confusing-n.patch
 bugfix/all/keys-ensure-we-free-the-assoc-array-edit-if-edit-is-valid.patch
+bugfix/s390/s390-cachinfo-add-missing-facility-check-to-init_cache_level.patch