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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: [PATCH 4.9 44/74] s390: add sysfs attributes for spectre
Date: Fri, 27 Apr 2018 15:58:34 +0200	[thread overview]
Message-ID: <20180427135711.750084883@linuxfoundation.org> (raw)
In-Reply-To: <20180427135709.899303463@linuxfoundation.org>

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Martin Schwidefsky <schwidefsky@de.ibm.com>


[ Upstream commit d424986f1d6b16079b3231db0314923f4f8deed1 ]

Set CONFIG_GENERIC_CPU_VULNERABILITIES and provide the two functions
cpu_show_spectre_v1 and cpu_show_spectre_v2 to report the spectre
mitigations.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/s390/Kconfig                |    1 +
 arch/s390/kernel/nospec-branch.c |   19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -118,6 +118,7 @@ config S390
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_CPU_AUTOPROBE
 	select GENERIC_CPU_DEVICES if !SMP
+	select GENERIC_CPU_VULNERABILITIES
 	select GENERIC_FIND_FIRST_BIT
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_TIME_VSYSCALL
--- a/arch/s390/kernel/nospec-branch.c
+++ b/arch/s390/kernel/nospec-branch.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <linux/module.h>
+#include <linux/device.h>
 #include <asm/facility.h>
 #include <asm/nospec-branch.h>
 
@@ -43,6 +44,24 @@ static int __init nospec_report(void)
 }
 arch_initcall(nospec_report);
 
+#ifdef CONFIG_SYSFS
+ssize_t cpu_show_spectre_v1(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "Mitigation: __user pointer sanitization\n");
+}
+
+ssize_t cpu_show_spectre_v2(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	if (IS_ENABLED(CC_USING_EXPOLINE) && !nospec_disable)
+		return sprintf(buf, "Mitigation: execute trampolines\n");
+	if (__test_facility(82, S390_lowcore.alt_stfle_fac_list))
+		return sprintf(buf, "Mitigation: limited branch prediction.\n");
+	return sprintf(buf, "Vulnerable\n");
+}
+#endif
+
 #ifdef CONFIG_EXPOLINE
 
 int nospec_disable = IS_ENABLED(CONFIG_EXPOLINE_OFF);

  parent reply	other threads:[~2018-04-27 13:58 UTC|newest]

Thread overview: 80+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-27 13:57 [PATCH 4.9 00/74] 4.9.97-stable review Greg Kroah-Hartman
2018-04-27 13:57 ` [PATCH 4.9 01/74] cifs: do not allow creating sockets except with SMB1 posix exensions Greg Kroah-Hartman
2018-04-27 13:57 ` [PATCH 4.9 02/74] x86/tsc: Prevent 32bit truncation in calc_hpet_ref() Greg Kroah-Hartman
2018-04-27 13:57 ` [PATCH 4.9 03/74] drm/vc4: Fix memory leak during BO teardown Greg Kroah-Hartman
2018-04-27 13:57 ` [PATCH 4.9 04/74] drm/i915: Fix LSPCON TMDS output buffer enabling from low-power state Greg Kroah-Hartman
2018-04-27 13:57 ` [PATCH 4.9 05/74] i2c: i801: store and restore the SLVCMD register at load and unload Greg Kroah-Hartman
2018-04-27 13:57 ` [PATCH 4.9 06/74] i2c: i801: Save register SMBSLVCMD value only once Greg Kroah-Hartman
2018-04-27 13:57 ` [PATCH 4.9 07/74] i2c: i801: Restore configuration at shutdown Greg Kroah-Hartman
2018-04-27 13:57 ` [PATCH 4.9 08/74] usb: musb: fix enumeration after resume Greg Kroah-Hartman
2018-04-27 13:57 ` [PATCH 4.9 09/74] usb: musb: call pm_runtime_{get,put}_sync before reading vbus registers Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 10/74] usb: musb: Fix external abort in musb_remove on omap2430 Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 11/74] MIPS: Generic: Fix big endian CPUs on generic machine Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 12/74] Input: drv260x - fix initializing overdrive voltage Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 13/74] power: supply: bq2415x: check for NULL acpi_id to avoid null pointer dereference Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 14/74] [media] stk-webcam: fix an endian bug in stk_camera_read_reg() Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 15/74] OF: Prevent unaligned access in of_alias_scan() Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 16/74] ath9k_hw: check if the chip failed to wake up Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 17/74] jbd2: fix use after free in kjournald2() Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 18/74] Revert "perf tools: Decompress kernel module when reading DSO data" Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 19/74] perf: Fix sample_max_stack maximum check Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 20/74] perf: Return proper values for user stack errors Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 21/74] RDMA/mlx5: Fix NULL dereference while accessing XRC_TGT QPs Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 22/74] drm/i915/bxt, glk: Increase PCODE timeouts during CDCLK freq changing Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 23/74] mac80211_hwsim: fix use-after-free bug in hwsim_exit_net Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 24/74] r8152: add Linksys USB3GIGV1 id Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 25/74] Revert "pinctrl: intel: Initialize GPIO properly when used through irqchip" Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 26/74] Revert "ath10k: send (re)assoc peer command when NSS changed" Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 27/74] PCI: Wait up to 60 seconds for device to become ready after FLR Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 28/74] s390: introduce CPU alternatives Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 29/74] s390: enable CPU alternatives unconditionally Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 30/74] KVM: s390: wire up bpb feature Greg Kroah-Hartman
2018-04-27 15:43   ` Christian Borntraeger
2018-04-27 13:58 ` [PATCH 4.9 31/74] s390: scrub registers on kernel entry and KVM exit Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 32/74] s390: add optimized array_index_mask_nospec Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 33/74] s390/alternative: use a copy of the facility bit mask Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 34/74] s390: add options to change branch prediction behaviour for the kernel Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 35/74] s390: run user space and KVM guests with modified branch prediction Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 36/74] s390: introduce execute-trampolines for branches Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 37/74] KVM: s390: force bp isolation for VSIE Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 38/74] s390: Replace IS_ENABLED(EXPOLINE_*) with IS_ENABLED(CONFIG_EXPOLINE_*) Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 39/74] s390: do not bypass BPENTER for interrupt system calls Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 40/74] s390/entry.S: fix spurious zeroing of r0 Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 41/74] s390: move nobp parameter functions to nospec-branch.c Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 42/74] s390: add automatic detection of the spectre defense Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 43/74] s390: report spectre mitigation via syslog Greg Kroah-Hartman
2018-04-27 13:58 ` Greg Kroah-Hartman [this message]
2018-04-27 13:58 ` [PATCH 4.9 45/74] s390: correct nospec auto detection init order Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 46/74] s390: correct module section names for expoline code revert Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 47/74] bonding: do not set slave_dev npinfo before slave_enable_netpoll in bond_enslave Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 48/74] KEYS: DNS: limit the length of option strings Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 49/74] l2tp: check sockaddr length in pppol2tp_connect() Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 50/74] net: validate attribute sizes in neigh_dump_table() Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 51/74] llc: delete timers synchronously in llc_sk_free() Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 52/74] tcp: dont read out-of-bounds opsize Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 53/74] team: avoid adding twice the same option to the event list Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 54/74] team: fix netconsole setup over team Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 55/74] packet: fix bitfield update race Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 56/74] tipc: add policy for TIPC_NLA_NET_ADDR Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 57/74] pppoe: check sockaddr length in pppoe_connect() Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 58/74] vlan: Fix reading memory beyond skb->tail in skb_vlan_tagged_multi Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 59/74] sctp: do not check port in sctp_inet6_cmp_addr Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 60/74] net: sched: ife: signal not finding metaid Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 61/74] llc: hold llc_sap before release_sock() Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 62/74] llc: fix NULL pointer deref for SOCK_ZAPPED Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 63/74] net: ethernet: ti: cpsw: fix tx vlan priority mapping Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 64/74] net: fix deadlock while clearing neighbor proxy table Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 65/74] tcp: md5: reject TCP_MD5SIG or TCP_MD5SIG_EXT on established sockets Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 66/74] net: af_packet: fix race in PACKET_{R|T}X_RING Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 67/74] ipv6: add RTA_TABLE and RTA_PREFSRC to rtm_ipv6_policy Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 68/74] strparser: Fix incorrect strp->need_bytes value Greg Kroah-Hartman
2018-04-27 13:58 ` [PATCH 4.9 69/74] scsi: mptsas: Disable WRITE SAME Greg Kroah-Hartman
2018-04-27 13:59 ` [PATCH 4.9 70/74] cdrom: information leak in cdrom_ioctl_media_changed() Greg Kroah-Hartman
2018-04-27 13:59 ` [PATCH 4.9 71/74] s390/cio: update chpid descriptor after resource accessibility event Greg Kroah-Hartman
2018-04-27 13:59 ` [PATCH 4.9 72/74] s390/dasd: fix IO error for newly defined devices Greg Kroah-Hartman
2018-04-27 13:59 ` [PATCH 4.9 73/74] s390/uprobes: implement arch_uretprobe_is_alive() Greg Kroah-Hartman
2018-04-27 13:59 ` [PATCH 4.9 74/74] ACPI / video: Only default only_lcd to true on Win8-ready _desktops_ Greg Kroah-Hartman
2018-04-27 18:13 ` [PATCH 4.9 00/74] 4.9.97-stable review Shuah Khan
2018-04-27 20:33 ` Dan Rue
2018-04-27 20:44 ` kernelci.org bot
2018-04-28 14:26 ` Guenter Roeck

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