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[4.2.y-ckt stable] Linux 4.2.8-ckt6 stable review

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  [4.2.y-ckt stable] Linux 4.2.8-ckt6 stable review Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 21/98] iommu/amd: Fix boot warning when device 00:00.0 is not iommu covered Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 87/98] tcp: fix tcpi_segs_in after connection establishment Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 65/98] ovl: fix getcwd() failure after unsuccessful rmdir Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 89/98] tcp: convert cached rtt from usec to jiffies when feeding initial rto Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 08/98] mac80211: minstrel: Change expected throughput unit back to Kbps Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 88/98] be2net: Don't leak iomapped memory on removal. Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 83/98] MIPS: Fix build error when SMP is used without GIC Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 93/98] ipv6: re-enable fragment header matching in ipv6_find_hdr Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 82/98] dmaengine: at_xdmac: fix residue computation Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 60/98] drm/radeon/pm: update current crtc info after setting the powerstate Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 85/98] dmaengine: pxa_dma: fix cyclic transfers Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 37/98] arm/arm64: KVM: Fix ioctl error handling Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 94/98] net/mlx5e: Remove wrong poll CQ optimization Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 77/98] jffs2: reduce the breakage on recovery from halfway failed rename() Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 86/98] MIPS: smp.c: Fix uninitialised temp_foreign_map Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 98/98] mld, igmp: Fix reserved tailroom calculation Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:40 +0100
    [PATCH 4.2.y-ckt 63/98] ALSA: hda - Fix mic issues on Acer Aspire E1-472 Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 76/98] ncpfs: fix a braino in OOM handling in ncp_fill_cache() Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 70/98] target: Drop incorrect ABORT_TASK put for completed commands Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 58/98] USB: qcserial: add Sierra Wireless EM74xx device ID Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 50/98] USB: serial: option: add support for Quectel UC20 Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 79/98] arm64: account for sparsemem section alignment when choosing vmemmap offset Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 61/98] drm/amdgpu: return from atombios_dp_get_dpcd only when error Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 80/98] tracing: Fix check for cpu online when event is disabled Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 47/98] ASoC: wm8994: Fix enum ctl accesses in a wrong type Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 44/98] USB: cp210x: Add ID for Parrot NMEA GPS Flight Recorder Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 45/98] ASoC: dapm: Fix ctl value accesses in a wrong type Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 57/98] drm/ast: Fix incorrect register check for DRAM width Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 46/98] ASoC: wm8958: Fix enum ctl accesses in a wrong type Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 49/98] USB: serial: option: add support for Telit LE922 PID 0x1045 Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 59/98] drm/amdgpu/pm: update current crtc info after setting the powerstate Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 48/98] ASoC: wm_adsp: Fix enum ctl accesses in a wrong type Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 42/98] use ->d_seq to get coherency between ->d_inode and ->d_flags Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 54/98] i2c: brcmstb: allocate correct amount of memory for regmap Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 56/98] parisc: Fix ptrace syscall number and return value modification Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 66/98] ovl: ignore lower entries when checking purity of non-directory entries Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 51/98] ALSA: usb-audio: Add a quirk for Plantronics DA45 Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 72/98] ARM: dts: dra7: do not gate cpsw clock due to errata i877 Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 43/98] USB: qcserial: add Dell Wireless 5809e Gobi 4G HSPA+ (rev3) Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 78/98] KVM: VMX: disable PEBS before a guest entry Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 68/98] MIPS: traps: Fix SIGFPE information leak from `do_ov' and `do_trap_or_bp' Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 71/98] ARM: OMAP2+: hwmod: Introduce ti,no-idle dt property Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 62/98] PM / sleep / x86: Fix crash on graph trace through x86 suspend Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 55/98] ALSA: seq: oss: Don't drain at closing a client Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 73/98] PCI: Allow a NULL "parent" pointer in pci_bus_assign_domain_nr() Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 41/98] ALSA: hdsp: Fix wrong boolean ctl value accesses Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 52/98] mac80211: check PN correctly for GCMP-encrypted fragmented MPDUs Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 81/98] KVM: MMU: fix ept=0/pte.u=1/pte.w=0/CR0.WP=0/CR4.SMEP=1/EFER.NX=0 combo Kamal Mostafa <kamal@canonical.com> - 2016-03-16 00:50 +0100
    [PATCH 4.2.y-ckt 29/98] ALSA: ctl: Fix ioctls for X32 ABI Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 26/98] KVM: x86: fix root cause for missed hardware breakpoints Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 10/98] iwlwifi: mvm: inc pending frames counter also when txing non-sta Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 35/98] CIFS: Fix SMB2+ interim response processing for read requests Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 16/98] mac80211: minstrel_ht: set default tx aggregation timeout to 0 Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 02/98] tipc: fix nullptr crash during subscription cancel Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 09/98] libata: fix HDIO_GET_32BIT ioctl Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 39/98] ALSA: hdspm: Fix wrong boolean ctl value accesses Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 18/98] Revert "jffs2: Fix lock acquisition order bug in jffs2_write_begin" Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 27/98] arm64: vmemmap: use virtual projection of linear region Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 06/98] cfg80211/wext: fix message ordering Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 34/98] cifs: fix out-of-bounds access in lease parsing Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 40/98] ALSA: hdspm: Fix zero-division Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 22/98] iommu/amd: Apply workaround for ATS write permission check Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 13/98] ahci: Order SATA device IDs for codename Lewisburg Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 04/98] Input: aiptek - fix crash on detecting device without endpoints Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 01/98] tipc: fix connection abort during subscription cancel Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 31/98] ALSA: rawmidi: Fix ioctls X32 ABI Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 14/98] Adding Intel Lewisburg device IDs for SATA Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 05/98] wext: fix message delay/ordering Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 07/98] mac80211: fix use of uninitialised values in RX aggregation Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 11/98] [media] adv7604: fix tx 5v detect regression Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 20/98] Fix directory hardlinks from deleted directories Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 25/98] fbcon: set a default value to blink interval Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 23/98] libata: Align ata_device's id on a cacheline Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 30/98] ALSA: pcm: Fix ioctls for X32 ABI Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 33/98] ALSA: timer: Fix ioctls for X32 ABI Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 38/98] MIPS: kvm: Fix ioctl error handling. Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 28/98] vfio: fix ioctl error handling Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 17/98] usb: chipidea: otg: change workqueue ci_otg as freezable Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 36/98] Fix cifs_uniqueid_to_ino_t() function for s390x Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100
    [PATCH 4.2.y-ckt 24/98] can: gs_usb: fixed disconnect bug by removing erroneous use of kfree() Kamal Mostafa <kamal@canonical.com> - 2016-03-16 01:00 +0100

Page 3 of 5 — ← Prev page 1 2 [3] 4 5  Next page →

#1358400 — [PATCH 4.2.y-ckt 78/98] KVM: VMX: disable PEBS before a guest entry

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= <rkrcmar@redhat.com>

commit 7099e2e1f4d9051f31bbfa5803adf954bb5d76ef upstream.

Linux guests on Haswell (and also SandyBridge and Broadwell, at least)
would crash if you decided to run a host command that uses PEBS, like
  perf record -e 'cpu/mem-stores/pp' -a

This happens because KVM is using VMX MSR switching to disable PEBS, but
SDM [2015-12] 18.4.4.4 Re-configuring PEBS Facilities explains why it
isn't safe:
  When software needs to reconfigure PEBS facilities, it should allow a
  quiescent period between stopping the prior event counting and setting
  up a new PEBS event. The quiescent period is to allow any latent
  residual PEBS records to complete its capture at their previously
  specified buffer address (provided by IA32_DS_AREA).

There might not be a quiescent period after the MSR switch, so a CPU
ends up using host's MSR_IA32_DS_AREA to access an area in guest's
memory.  (Or MSR switching is just buggy on some models.)

The guest can learn something about the host this way:
If the guest doesn't map address pointed by MSR_IA32_DS_AREA, it results
in #PF where we leak host's MSR_IA32_DS_AREA through CR2.

After that, a malicious guest can map and configure memory where
MSR_IA32_DS_AREA is pointing and can therefore get an output from
host's tracing.

This is not a critical leak as the host must initiate with PEBS tracing
and I have not been able to get a record from more than one instruction
before vmentry in vmx_vcpu_run() (that place has most registers already
overwritten with guest's).

We could disable PEBS just few instructions before vmentry, but
disabling it earlier shouldn't affect host tracing too much.
We also don't need to switch MSR_IA32_PEBS_ENABLE on VMENTRY, but that
optimization isn't worth its code, IMO.

(If you are implementing PEBS for guests, be sure to handle the case
 where both host and guest enable PEBS, because this patch doesn't.)

Fixes: 26a4f3c08de4 ("perf/x86: disable PEBS on a guest entry.")
Reported-by: Jiří Olša <jolsa@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 arch/x86/kvm/vmx.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 8db7c2f..cb450d8 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1674,6 +1674,13 @@ static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
 			return;
 		}
 		break;
+	case MSR_IA32_PEBS_ENABLE:
+		/* PEBS needs a quiescent period after being disabled (to write
+		 * a record).  Disabling PEBS through VMX MSR swapping doesn't
+		 * provide that period, so a CPU could write host's record into
+		 * guest's memory.
+		 */
+		wrmsrl(MSR_IA32_PEBS_ENABLE, 0);
 	}
 
 	for (i = 0; i < m->nr; ++i)
-- 
2.7.0

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#1358401 — [PATCH 4.2.y-ckt 68/98] MIPS: traps: Fix SIGFPE information leak from `do_ov' and `do_trap_or_bp'

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: "Maciej W. Rozycki" <macro@imgtec.com>

commit e723e3f7f9591b79e8c56b3d7c5a204a9c571b55 upstream.

Avoid sending a partially initialised `siginfo_t' structure along SIGFPE
signals issued from `do_ov' and `do_trap_or_bp', leading to information
leaking from the kernel stack.

Signed-off-by: Maciej W. Rozycki <macro@imgtec.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 arch/mips/kernel/traps.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 8ea28e6..ef1e9d3 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -694,15 +694,15 @@ static int simulate_sync(struct pt_regs *regs, unsigned int opcode)
 asmlinkage void do_ov(struct pt_regs *regs)
 {
 	enum ctx_state prev_state;
-	siginfo_t info;
+	siginfo_t info = {
+		.si_signo = SIGFPE,
+		.si_code = FPE_INTOVF,
+		.si_addr = (void __user *)regs->cp0_epc,
+	};
 
 	prev_state = exception_enter();
 	die_if_kernel("Integer overflow", regs);
 
-	info.si_code = FPE_INTOVF;
-	info.si_signo = SIGFPE;
-	info.si_errno = 0;
-	info.si_addr = (void __user *) regs->cp0_epc;
 	force_sig_info(SIGFPE, &info, current);
 	exception_exit(prev_state);
 }
@@ -878,7 +878,7 @@ out:
 void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
 	const char *str)
 {
-	siginfo_t info;
+	siginfo_t info = { 0 };
 	char b[40];
 
 #ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
@@ -906,7 +906,6 @@ void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
 		else
 			info.si_code = FPE_INTOVF;
 		info.si_signo = SIGFPE;
-		info.si_errno = 0;
 		info.si_addr = (void __user *) regs->cp0_epc;
 		force_sig_info(SIGFPE, &info, current);
 		break;
-- 
2.7.0

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#1358402 — [PATCH 4.2.y-ckt 71/98] ARM: OMAP2+: hwmod: Introduce ti,no-idle dt property

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Lokesh Vutla <lokeshvutla@ti.com>

commit 2e18f5a1bc18e8af7031b3b26efde25307014837 upstream.

Introduce a dt property, ti,no-idle, that prevents an IP to idle at any
point. This is to handle Errata i877, which tells that GMAC clocks
cannot be disabled.

Acked-by: Roger Quadros <rogerq@ti.com>
Tested-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 Documentation/devicetree/bindings/arm/omap/omap.txt | 1 +
 arch/arm/mach-omap2/omap_hwmod.c                    | 9 ++++++++-
 arch/arm/mach-omap2/omap_hwmod.h                    | 3 +++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/omap/omap.txt b/Documentation/devicetree/bindings/arm/omap/omap.txt
index 4f6a82c..cbe35b3 100644
--- a/Documentation/devicetree/bindings/arm/omap/omap.txt
+++ b/Documentation/devicetree/bindings/arm/omap/omap.txt
@@ -23,6 +23,7 @@ Optional properties:
   during suspend.
 - ti,no-reset-on-init: When present, the module should not be reset at init
 - ti,no-idle-on-init: When present, the module should not be idled at init
+- ti,no-idle: When present, the module is never allowed to idle.
 
 Example:
 
diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c
index 486cc4d..573da0d 100644
--- a/arch/arm/mach-omap2/omap_hwmod.c
+++ b/arch/arm/mach-omap2/omap_hwmod.c
@@ -2180,6 +2180,11 @@ static int _enable(struct omap_hwmod *oh)
  */
 static int _idle(struct omap_hwmod *oh)
 {
+	if (oh->flags & HWMOD_NO_IDLE) {
+		oh->_int_flags |= _HWMOD_SKIP_ENABLE;
+		return 0;
+	}
+
 	pr_debug("omap_hwmod: %s: idling\n", oh->name);
 
 	if (oh->_state != _HWMOD_STATE_ENABLED) {
@@ -2484,6 +2489,8 @@ static int __init _init(struct omap_hwmod *oh, void *data)
 			oh->flags |= HWMOD_INIT_NO_RESET;
 		if (of_find_property(np, "ti,no-idle-on-init", NULL))
 			oh->flags |= HWMOD_INIT_NO_IDLE;
+		if (of_find_property(np, "ti,no-idle", NULL))
+			oh->flags |= HWMOD_NO_IDLE;
 	}
 
 	oh->_state = _HWMOD_STATE_INITIALIZED;
@@ -2610,7 +2617,7 @@ static void __init _setup_postsetup(struct omap_hwmod *oh)
 	 * XXX HWMOD_INIT_NO_IDLE does not belong in hwmod data -
 	 * it should be set by the core code as a runtime flag during startup
 	 */
-	if ((oh->flags & HWMOD_INIT_NO_IDLE) &&
+	if ((oh->flags & (HWMOD_INIT_NO_IDLE | HWMOD_NO_IDLE)) &&
 	    (postsetup_state == _HWMOD_STATE_IDLE)) {
 		oh->_int_flags |= _HWMOD_SKIP_ENABLE;
 		postsetup_state = _HWMOD_STATE_ENABLED;
diff --git a/arch/arm/mach-omap2/omap_hwmod.h b/arch/arm/mach-omap2/omap_hwmod.h
index b5d27ec..1681310 100644
--- a/arch/arm/mach-omap2/omap_hwmod.h
+++ b/arch/arm/mach-omap2/omap_hwmod.h
@@ -523,6 +523,8 @@ struct omap_hwmod_omap4_prcm {
  * HWMOD_RECONFIG_IO_CHAIN: omap_hwmod code needs to reconfigure wake-up 
  *     events by calling _reconfigure_io_chain() when a device is enabled
  *     or idled.
+ * HWMOD_NO_IDLE: Do not idle the hwmod at all. Useful to handle certain
+ *     IPs like CPSW on DRA7, where clocks to this module cannot be disabled.
  */
 #define HWMOD_SWSUP_SIDLE			(1 << 0)
 #define HWMOD_SWSUP_MSTANDBY			(1 << 1)
@@ -538,6 +540,7 @@ struct omap_hwmod_omap4_prcm {
 #define HWMOD_FORCE_MSTANDBY			(1 << 11)
 #define HWMOD_SWSUP_SIDLE_ACT			(1 << 12)
 #define HWMOD_RECONFIG_IO_CHAIN			(1 << 13)
+#define HWMOD_NO_IDLE				(1 << 15)
 
 /*
  * omap_hwmod._int_flags definitions
-- 
2.7.0

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#1358403 — [PATCH 4.2.y-ckt 62/98] PM / sleep / x86: Fix crash on graph trace through x86 suspend

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Todd E Brandt <todd.e.brandt@linux.intel.com>

commit 92f9e179a702a6adbc11e2fedc76ecd6ffc9e3f7 upstream.

Pause/unpause graph tracing around do_suspend_lowlevel as it has
inconsistent call/return info after it jumps to the wakeup vector.
The graph trace buffer will otherwise become misaligned and
may eventually crash and hang on suspend.

To reproduce the issue and test the fix:
Run a function_graph trace over suspend/resume and set the graph
function to suspend_devices_and_enter. This consistently hangs the
system without this fix.

Signed-off-by: Todd Brandt <todd.e.brandt@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 arch/x86/kernel/acpi/sleep.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
index d1daead..adb3eaf 100644
--- a/arch/x86/kernel/acpi/sleep.c
+++ b/arch/x86/kernel/acpi/sleep.c
@@ -16,6 +16,7 @@
 #include <asm/cacheflush.h>
 #include <asm/realmode.h>
 
+#include <linux/ftrace.h>
 #include "../../realmode/rm/wakeup.h"
 #include "sleep.h"
 
@@ -107,7 +108,13 @@ int x86_acpi_suspend_lowlevel(void)
        saved_magic = 0x123456789abcdef0L;
 #endif /* CONFIG_64BIT */
 
+	/*
+	 * Pause/unpause graph tracing around do_suspend_lowlevel as it has
+	 * inconsistent call/return info after it jumps to the wakeup vector.
+	 */
+	pause_graph_tracing();
 	do_suspend_lowlevel();
+	unpause_graph_tracing();
 	return 0;
 }
 
-- 
2.7.0

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#1358404 — [PATCH 4.2.y-ckt 55/98] ALSA: seq: oss: Don't drain at closing a client

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Takashi Iwai <tiwai@suse.de>

commit 197b958c1e76a575d77038cc98b4bebc2134279f upstream.

The OSS sequencer client tries to drain the pending events at
releasing.  Unfortunately, as spotted by syzkaller fuzzer, this may
lead to an unkillable process state when the event has been queued at
the far future.  Since the process being released can't be signaled
any longer, it remains and waits for the echo-back event in that far
future.

Back to history, the draining feature was implemented at the time we
misinterpreted POSIX definition for blocking file operation.
Actually, such a behavior is superfluous at release, and we should
just release the device as is instead of keeping it up forever.

This patch just removes the draining call that may block the release
for too long time unexpectedly.

BugLink: http://lkml.kernel.org/r/CACT4Y+Y4kD-aBGj37rf-xBw9bH3GMU6P+MYg4W1e-s-paVD2pg@mail.gmail.com
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 sound/core/seq/oss/seq_oss.c        |  2 --
 sound/core/seq/oss/seq_oss_device.h |  1 -
 sound/core/seq/oss/seq_oss_init.c   | 16 ----------------
 3 files changed, 19 deletions(-)

diff --git a/sound/core/seq/oss/seq_oss.c b/sound/core/seq/oss/seq_oss.c
index 7354b8b..cb23899 100644
--- a/sound/core/seq/oss/seq_oss.c
+++ b/sound/core/seq/oss/seq_oss.c
@@ -148,8 +148,6 @@ odev_release(struct inode *inode, struct file *file)
 	if ((dp = file->private_data) == NULL)
 		return 0;
 
-	snd_seq_oss_drain_write(dp);
-
 	mutex_lock(&register_mutex);
 	snd_seq_oss_release(dp);
 	mutex_unlock(&register_mutex);
diff --git a/sound/core/seq/oss/seq_oss_device.h b/sound/core/seq/oss/seq_oss_device.h
index b439243..d7b4d01 100644
--- a/sound/core/seq/oss/seq_oss_device.h
+++ b/sound/core/seq/oss/seq_oss_device.h
@@ -127,7 +127,6 @@ int snd_seq_oss_write(struct seq_oss_devinfo *dp, const char __user *buf, int co
 unsigned int snd_seq_oss_poll(struct seq_oss_devinfo *dp, struct file *file, poll_table * wait);
 
 void snd_seq_oss_reset(struct seq_oss_devinfo *dp);
-void snd_seq_oss_drain_write(struct seq_oss_devinfo *dp);
 
 /* */
 void snd_seq_oss_process_queue(struct seq_oss_devinfo *dp, abstime_t time);
diff --git a/sound/core/seq/oss/seq_oss_init.c b/sound/core/seq/oss/seq_oss_init.c
index 6779e82b..92c96a9 100644
--- a/sound/core/seq/oss/seq_oss_init.c
+++ b/sound/core/seq/oss/seq_oss_init.c
@@ -436,22 +436,6 @@ snd_seq_oss_release(struct seq_oss_devinfo *dp)
 
 
 /*
- * Wait until the queue is empty (if we don't have nonblock)
- */
-void
-snd_seq_oss_drain_write(struct seq_oss_devinfo *dp)
-{
-	if (! dp->timer->running)
-		return;
-	if (is_write_mode(dp->file_mode) && !is_nonblock_mode(dp->file_mode) &&
-	    dp->writeq) {
-		while (snd_seq_oss_writeq_sync(dp->writeq))
-			;
-	}
-}
-
-
-/*
  * reset sequencer devices
  */
 void
-- 
2.7.0

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#1358405 — [PATCH 4.2.y-ckt 73/98] PCI: Allow a NULL "parent" pointer in pci_bus_assign_domain_nr()

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: =?UTF-8?q?Krzysztof=20=3D=3Futf-8=3FQ=3FHa=3DC5=3D82asa=3F=3D?=

commit 54c6e2dd00c313d0add58e5befe62fe6f286d03b upstream.

pci_create_root_bus() passes a "parent" pointer to
pci_bus_assign_domain_nr().  When CONFIG_PCI_DOMAINS_GENERIC is defined,
pci_bus_assign_domain_nr() dereferences that pointer.  Many callers of
pci_create_root_bus() supply a NULL "parent" pointer, which leads to a NULL
pointer dereference error.

7c674700098c ("PCI: Move domain assignment from arm64 to generic code")
moved the "parent" dereference from arm64 to generic code.  Only arm64 used
that code (because only arm64 defined CONFIG_PCI_DOMAINS_GENERIC), and it
always supplied a valid "parent" pointer.  Other arches supplied NULL
"parent" pointers but didn't defined CONFIG_PCI_DOMAINS_GENERIC, so they
used a no-op version of pci_bus_assign_domain_nr().

8c7d14746abc ("ARM/PCI: Move to generic PCI domains") defined
CONFIG_PCI_DOMAINS_GENERIC on ARM, and many ARM platforms use
pci_common_init(), which supplies a NULL "parent" pointer.
These platforms (cns3xxx, dove, footbridge, iop13xx, etc.) crash
with a NULL pointer dereference like this while probing PCI:

  Unable to handle kernel NULL pointer dereference at virtual address 000000a4
  PC is at pci_bus_assign_domain_nr+0x10/0x84
  LR is at pci_create_root_bus+0x48/0x2e4
  Kernel panic - not syncing: Attempted to kill init!

[bhelgaas: changelog, add "Reported:" and "Fixes:" tags]
Reported: http://forum.doozan.com/read.php?2,17868,22070,quote=1
Fixes: 8c7d14746abc ("ARM/PCI: Move to generic PCI domains")
Fixes: 7c674700098c ("PCI: Move domain assignment from arm64 to generic code")
Signed-off-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/pci/pci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 0008c95..f6f2384 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4487,8 +4487,10 @@ int pci_get_new_domain_nr(void)
 void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
 {
 	static int use_dt_domains = -1;
-	int domain = of_get_pci_domain_nr(parent->of_node);
+	int domain = -1;
 
+	if (parent)
+		domain = of_get_pci_domain_nr(parent->of_node);
 	/*
 	 * Check DT domain and use_dt_domains values.
 	 *
-- 
2.7.0

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#1358406 — [PATCH 4.2.y-ckt 41/98] ALSA: hdsp: Fix wrong boolean ctl value accesses

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Takashi Iwai <tiwai@suse.de>

commit eab3c4db193f5fcccf70e884de9a922ca2c63d80 upstream.

snd-hdsp driver accesses enum item values (int) instead of boolean
values (long) wrongly for some ctl elements.  This patch fixes them.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 sound/pci/rme9652/hdsp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
index c19e021..1124628 100644
--- a/sound/pci/rme9652/hdsp.c
+++ b/sound/pci/rme9652/hdsp.c
@@ -2878,7 +2878,7 @@ static int snd_hdsp_get_dds_offset(struct snd_kcontrol *kcontrol, struct snd_ctl
 {
 	struct hdsp *hdsp = snd_kcontrol_chip(kcontrol);
 
-	ucontrol->value.enumerated.item[0] = hdsp_dds_offset(hdsp);
+	ucontrol->value.integer.value[0] = hdsp_dds_offset(hdsp);
 	return 0;
 }
 
@@ -2890,7 +2890,7 @@ static int snd_hdsp_put_dds_offset(struct snd_kcontrol *kcontrol, struct snd_ctl
 
 	if (!snd_hdsp_use_is_exclusive(hdsp))
 		return -EBUSY;
-	val = ucontrol->value.enumerated.item[0];
+	val = ucontrol->value.integer.value[0];
 	spin_lock_irq(&hdsp->lock);
 	if (val != hdsp_dds_offset(hdsp))
 		change = (hdsp_set_dds_offset(hdsp, val) == 0) ? 1 : 0;
-- 
2.7.0

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#1358408 — [PATCH 4.2.y-ckt 52/98] mac80211: check PN correctly for GCMP-encrypted fragmented MPDUs

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Johannes Berg <johannes.berg@intel.com>

commit 9acc54beb474c81148e2946603d141cf8716b19f upstream.

Just like for CCMP we need to check that for GCMP the fragments
have PNs that increment by one; the spec was updated to fix this
security issue and now has the following text:

	The receiver shall discard MSDUs and MMPDUs whose constituent
	MPDU PN values are not incrementing in steps of 1.

Adapt the code for CCMP to work for GCMP as well, luckily the
relevant fields already alias each other so no code duplication
is needed (just check the aliasing with BUILD_BUG_ON.)

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 net/mac80211/ieee80211_i.h |  2 +-
 net/mac80211/rx.c          | 36 +++++++++++++++++++++++++++---------
 2 files changed, 28 insertions(+), 10 deletions(-)

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index b12f615..056f658 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -90,7 +90,7 @@ struct ieee80211_fragment_entry {
 	unsigned int last_frag;
 	unsigned int extra_len;
 	struct sk_buff_head skb_list;
-	int ccmp; /* Whether fragments were encrypted with CCMP */
+	bool check_sequential_pn; /* needed for CCMP/GCMP */
 	u8 last_pn[6]; /* PN of the last fragment if CCMP was used */
 };
 
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 5dae166..cb83036 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1715,7 +1715,7 @@ ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata,
 	entry->seq = seq;
 	entry->rx_queue = rx_queue;
 	entry->last_frag = frag;
-	entry->ccmp = 0;
+	entry->check_sequential_pn = false;
 	entry->extra_len = 0;
 
 	return entry;
@@ -1811,15 +1811,27 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
 						 rx->seqno_idx, &(rx->skb));
 		if (rx->key &&
 		    (rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP ||
-		     rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256) &&
+		     rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 ||
+		     rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP ||
+		     rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) &&
 		    ieee80211_has_protected(fc)) {
 			int queue = rx->security_idx;
-			/* Store CCMP PN so that we can verify that the next
-			 * fragment has a sequential PN value. */
-			entry->ccmp = 1;
+
+			/* Store CCMP/GCMP PN so that we can verify that the
+			 * next fragment has a sequential PN value.
+			 */
+			entry->check_sequential_pn = true;
 			memcpy(entry->last_pn,
 			       rx->key->u.ccmp.rx_pn[queue],
 			       IEEE80211_CCMP_PN_LEN);
+			BUILD_BUG_ON(offsetof(struct ieee80211_key,
+					      u.ccmp.rx_pn) !=
+				     offsetof(struct ieee80211_key,
+					      u.gcmp.rx_pn));
+			BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) !=
+				     sizeof(rx->key->u.gcmp.rx_pn[queue]));
+			BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN !=
+				     IEEE80211_GCMP_PN_LEN);
 		}
 		return RX_QUEUED;
 	}
@@ -1834,15 +1846,21 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
 		return RX_DROP_MONITOR;
 	}
 
-	/* Verify that MPDUs within one MSDU have sequential PN values.
-	 * (IEEE 802.11i, 8.3.3.4.5) */
-	if (entry->ccmp) {
+	/* "The receiver shall discard MSDUs and MMPDUs whose constituent
+	 *  MPDU PN values are not incrementing in steps of 1."
+	 * see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP)
+	 * and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP)
+	 */
+	if (entry->check_sequential_pn) {
 		int i;
 		u8 pn[IEEE80211_CCMP_PN_LEN], *rpn;
 		int queue;
+
 		if (!rx->key ||
 		    (rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP &&
-		     rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256))
+		     rx->key->conf.cipher != WLAN_CIPHER_SUITE_CCMP_256 &&
+		     rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP &&
+		     rx->key->conf.cipher != WLAN_CIPHER_SUITE_GCMP_256))
 			return RX_DROP_UNUSABLE;
 		memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN);
 		for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) {
-- 
2.7.0

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#1358409 — [PATCH 4.2.y-ckt 81/98] KVM: MMU: fix ept=0/pte.u=1/pte.w=0/CR0.WP=0/CR4.SMEP=1/EFER.NX=0 combo

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Paolo Bonzini <pbonzini@redhat.com>

commit 844a5fe219cf472060315971e15cbf97674a3324 upstream.

Yes, all of these are needed. :) This is admittedly a bit odd, but
kvm-unit-tests access.flat tests this if you run it with "-cpu host"
and of course ept=0.

KVM runs the guest with CR0.WP=1, so it must handle supervisor writes
specially when pte.u=1/pte.w=0/CR0.WP=0.  Such writes cause a fault
when U=1 and W=0 in the SPTE, but they must succeed because CR0.WP=0.
When KVM gets the fault, it sets U=0 and W=1 in the shadow PTE and
restarts execution.  This will still cause a user write to fault, while
supervisor writes will succeed.  User reads will fault spuriously now,
and KVM will then flip U and W again in the SPTE (U=1, W=0).  User reads
will be enabled and supervisor writes disabled, going back to the
originary situation where supervisor writes fault spuriously.

When SMEP is in effect, however, U=0 will enable kernel execution of
this page.  To avoid this, KVM also sets NX=1 in the shadow PTE together
with U=0.  If the guest has not enabled NX, the result is a continuous
stream of page faults due to the NX bit being reserved.

The fix is to force EFER.NX=1 even if the CPU is taking care of the EFER
switch.  (All machines with SMEP have the CPU_LOAD_IA32_EFER vm-entry
control, so they do not use user-return notifiers for EFER---if they did,
EFER.NX would be forced to the same value as the host).

There is another bug in the reserved bit check, which I've split to a
separate patch for easier application to stable kernels.

Cc: Andy Lutomirski <luto@amacapital.net>
Reviewed-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Fixes: f6577a5fa15d82217ca73c74cd2dcbc0f6c781dd
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 Documentation/virtual/kvm/mmu.txt |  3 ++-
 arch/x86/kvm/vmx.c                | 36 +++++++++++++++++++++++-------------
 2 files changed, 25 insertions(+), 14 deletions(-)

diff --git a/Documentation/virtual/kvm/mmu.txt b/Documentation/virtual/kvm/mmu.txt
index 3a4d681..b653641 100644
--- a/Documentation/virtual/kvm/mmu.txt
+++ b/Documentation/virtual/kvm/mmu.txt
@@ -358,7 +358,8 @@ In the first case there are two additional complications:
 - if CR4.SMEP is enabled: since we've turned the page into a kernel page,
   the kernel may now execute it.  We handle this by also setting spte.nx.
   If we get a user fetch or read fault, we'll change spte.u=1 and
-  spte.nx=gpte.nx back.
+  spte.nx=gpte.nx back.  For this to work, KVM forces EFER.NX to 1 when
+  shadow paging is in use.
 - if CR4.SMAP is disabled: since the page has been changed to a kernel
   page, it can not be reused when CR4.SMAP is enabled. We set
   CR4.SMAP && !CR0.WP into shadow page's role to avoid this case. Note,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index cb450d8..abf8cc7 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1718,26 +1718,31 @@ static void reload_tss(void)
 
 static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
 {
-	u64 guest_efer;
-	u64 ignore_bits;
+	u64 guest_efer = vmx->vcpu.arch.efer;
+	u64 ignore_bits = 0;
 
-	guest_efer = vmx->vcpu.arch.efer;
+	if (!enable_ept) {
+		/*
+		 * NX is needed to handle CR0.WP=1, CR4.SMEP=1.  Testing
+		 * host CPUID is more efficient than testing guest CPUID
+		 * or CR4.  Host SMEP is anyway a requirement for guest SMEP.
+		 */
+		if (boot_cpu_has(X86_FEATURE_SMEP))
+			guest_efer |= EFER_NX;
+		else if (!(guest_efer & EFER_NX))
+			ignore_bits |= EFER_NX;
+	}
 
 	/*
-	 * NX is emulated; LMA and LME handled by hardware; SCE meaningless
-	 * outside long mode
+	 * LMA and LME handled by hardware; SCE meaningless outside long mode.
 	 */
-	ignore_bits = EFER_NX | EFER_SCE;
+	ignore_bits |= EFER_SCE;
 #ifdef CONFIG_X86_64
 	ignore_bits |= EFER_LMA | EFER_LME;
 	/* SCE is meaningful only in long mode on Intel */
 	if (guest_efer & EFER_LMA)
 		ignore_bits &= ~(u64)EFER_SCE;
 #endif
-	guest_efer &= ~ignore_bits;
-	guest_efer |= host_efer & ignore_bits;
-	vmx->guest_msrs[efer_offset].data = guest_efer;
-	vmx->guest_msrs[efer_offset].mask = ~ignore_bits;
 
 	clear_atomic_switch_msr(vmx, MSR_EFER);
 
@@ -1748,16 +1753,21 @@ static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
 	 */
 	if (cpu_has_load_ia32_efer ||
 	    (enable_ept && ((vmx->vcpu.arch.efer ^ host_efer) & EFER_NX))) {
-		guest_efer = vmx->vcpu.arch.efer;
 		if (!(guest_efer & EFER_LMA))
 			guest_efer &= ~EFER_LME;
 		if (guest_efer != host_efer)
 			add_atomic_switch_msr(vmx, MSR_EFER,
 					      guest_efer, host_efer);
 		return false;
-	}
+	} else {
+		guest_efer &= ~ignore_bits;
+		guest_efer |= host_efer & ignore_bits;
 
-	return true;
+		vmx->guest_msrs[efer_offset].data = guest_efer;
+		vmx->guest_msrs[efer_offset].mask = ~ignore_bits;
+
+		return true;
+	}
 }
 
 static unsigned long segment_base(u16 selector)
-- 
2.7.0

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#1358410 — [PATCH 4.2.y-ckt 29/98] ALSA: ctl: Fix ioctls for X32 ABI

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Takashi Iwai <tiwai@suse.de>

commit 6236d8bb2afcfe71b88ecea554e0dc638090a45f upstream.

The X32 ABI takes the same alignment like x86-64, and this may result
in the incompatible struct size from ia32.  Unfortunately, we hit this
in some control ABI: struct snd_ctl_elem_value differs between them
due to the position of 64bit variable array.  This ends up with the
unknown ioctl (ENOTTY) error.

The fix is to add the compat entries for the new aligned struct.

Reported-and-tested-by: Steven Newbury <steve@snewbury.org.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 sound/core/control_compat.c | 90 +++++++++++++++++++++++++++++++++++++--------
 1 file changed, 74 insertions(+), 16 deletions(-)

diff --git a/sound/core/control_compat.c b/sound/core/control_compat.c
index b9c0910..0608f21 100644
--- a/sound/core/control_compat.c
+++ b/sound/core/control_compat.c
@@ -170,6 +170,19 @@ struct snd_ctl_elem_value32 {
         unsigned char reserved[128];
 };
 
+#ifdef CONFIG_X86_X32
+/* x32 has a different alignment for 64bit values from ia32 */
+struct snd_ctl_elem_value_x32 {
+	struct snd_ctl_elem_id id;
+	unsigned int indirect;	/* bit-field causes misalignment */
+	union {
+		s32 integer[128];
+		unsigned char data[512];
+		s64 integer64[64];
+	} value;
+	unsigned char reserved[128];
+};
+#endif /* CONFIG_X86_X32 */
 
 /* get the value type and count of the control */
 static int get_ctl_type(struct snd_card *card, struct snd_ctl_elem_id *id,
@@ -219,9 +232,11 @@ static int get_elem_size(int type, int count)
 
 static int copy_ctl_value_from_user(struct snd_card *card,
 				    struct snd_ctl_elem_value *data,
-				    struct snd_ctl_elem_value32 __user *data32,
+				    void __user *userdata,
+				    void __user *valuep,
 				    int *typep, int *countp)
 {
+	struct snd_ctl_elem_value32 __user *data32 = userdata;
 	int i, type, size;
 	int uninitialized_var(count);
 	unsigned int indirect;
@@ -239,8 +254,9 @@ static int copy_ctl_value_from_user(struct snd_card *card,
 	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
 	    type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
 		for (i = 0; i < count; i++) {
+			s32 __user *intp = valuep;
 			int val;
-			if (get_user(val, &data32->value.integer[i]))
+			if (get_user(val, &intp[i]))
 				return -EFAULT;
 			data->value.integer.value[i] = val;
 		}
@@ -250,8 +266,7 @@ static int copy_ctl_value_from_user(struct snd_card *card,
 			dev_err(card->dev, "snd_ioctl32_ctl_elem_value: unknown type %d\n", type);
 			return -EINVAL;
 		}
-		if (copy_from_user(data->value.bytes.data,
-				   data32->value.data, size))
+		if (copy_from_user(data->value.bytes.data, valuep, size))
 			return -EFAULT;
 	}
 
@@ -261,7 +276,8 @@ static int copy_ctl_value_from_user(struct snd_card *card,
 }
 
 /* restore the value to 32bit */
-static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32,
+static int copy_ctl_value_to_user(void __user *userdata,
+				  void __user *valuep,
 				  struct snd_ctl_elem_value *data,
 				  int type, int count)
 {
@@ -270,22 +286,22 @@ static int copy_ctl_value_to_user(struct snd_ctl_elem_value32 __user *data32,
 	if (type == SNDRV_CTL_ELEM_TYPE_BOOLEAN ||
 	    type == SNDRV_CTL_ELEM_TYPE_INTEGER) {
 		for (i = 0; i < count; i++) {
+			s32 __user *intp = valuep;
 			int val;
 			val = data->value.integer.value[i];
-			if (put_user(val, &data32->value.integer[i]))
+			if (put_user(val, &intp[i]))
 				return -EFAULT;
 		}
 	} else {
 		size = get_elem_size(type, count);
-		if (copy_to_user(data32->value.data,
-				 data->value.bytes.data, size))
+		if (copy_to_user(valuep, data->value.bytes.data, size))
 			return -EFAULT;
 	}
 	return 0;
 }
 
-static int snd_ctl_elem_read_user_compat(struct snd_card *card, 
-					 struct snd_ctl_elem_value32 __user *data32)
+static int ctl_elem_read_user(struct snd_card *card,
+			      void __user *userdata, void __user *valuep)
 {
 	struct snd_ctl_elem_value *data;
 	int err, type, count;
@@ -294,7 +310,9 @@ static int snd_ctl_elem_read_user_compat(struct snd_card *card,
 	if (data == NULL)
 		return -ENOMEM;
 
-	if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
+	err = copy_ctl_value_from_user(card, data, userdata, valuep,
+				       &type, &count);
+	if (err < 0)
 		goto error;
 
 	snd_power_lock(card);
@@ -303,14 +321,15 @@ static int snd_ctl_elem_read_user_compat(struct snd_card *card,
 		err = snd_ctl_elem_read(card, data);
 	snd_power_unlock(card);
 	if (err >= 0)
-		err = copy_ctl_value_to_user(data32, data, type, count);
+		err = copy_ctl_value_to_user(userdata, valuep, data,
+					     type, count);
  error:
 	kfree(data);
 	return err;
 }
 
-static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
-					  struct snd_ctl_elem_value32 __user *data32)
+static int ctl_elem_write_user(struct snd_ctl_file *file,
+			       void __user *userdata, void __user *valuep)
 {
 	struct snd_ctl_elem_value *data;
 	struct snd_card *card = file->card;
@@ -320,7 +339,9 @@ static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
 	if (data == NULL)
 		return -ENOMEM;
 
-	if ((err = copy_ctl_value_from_user(card, data, data32, &type, &count)) < 0)
+	err = copy_ctl_value_from_user(card, data, userdata, valuep,
+				       &type, &count);
+	if (err < 0)
 		goto error;
 
 	snd_power_lock(card);
@@ -329,12 +350,39 @@ static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
 		err = snd_ctl_elem_write(card, file, data);
 	snd_power_unlock(card);
 	if (err >= 0)
-		err = copy_ctl_value_to_user(data32, data, type, count);
+		err = copy_ctl_value_to_user(userdata, valuep, data,
+					     type, count);
  error:
 	kfree(data);
 	return err;
 }
 
+static int snd_ctl_elem_read_user_compat(struct snd_card *card,
+					 struct snd_ctl_elem_value32 __user *data32)
+{
+	return ctl_elem_read_user(card, data32, &data32->value);
+}
+
+static int snd_ctl_elem_write_user_compat(struct snd_ctl_file *file,
+					  struct snd_ctl_elem_value32 __user *data32)
+{
+	return ctl_elem_write_user(file, data32, &data32->value);
+}
+
+#ifdef CONFIG_X86_X32
+static int snd_ctl_elem_read_user_x32(struct snd_card *card,
+				      struct snd_ctl_elem_value_x32 __user *data32)
+{
+	return ctl_elem_read_user(card, data32, &data32->value);
+}
+
+static int snd_ctl_elem_write_user_x32(struct snd_ctl_file *file,
+				       struct snd_ctl_elem_value_x32 __user *data32)
+{
+	return ctl_elem_write_user(file, data32, &data32->value);
+}
+#endif /* CONFIG_X86_X32 */
+
 /* add or replace a user control */
 static int snd_ctl_elem_add_compat(struct snd_ctl_file *file,
 				   struct snd_ctl_elem_info32 __user *data32,
@@ -393,6 +441,10 @@ enum {
 	SNDRV_CTL_IOCTL_ELEM_WRITE32 = _IOWR('U', 0x13, struct snd_ctl_elem_value32),
 	SNDRV_CTL_IOCTL_ELEM_ADD32 = _IOWR('U', 0x17, struct snd_ctl_elem_info32),
 	SNDRV_CTL_IOCTL_ELEM_REPLACE32 = _IOWR('U', 0x18, struct snd_ctl_elem_info32),
+#ifdef CONFIG_X86_X32
+	SNDRV_CTL_IOCTL_ELEM_READ_X32 = _IOWR('U', 0x12, struct snd_ctl_elem_value_x32),
+	SNDRV_CTL_IOCTL_ELEM_WRITE_X32 = _IOWR('U', 0x13, struct snd_ctl_elem_value_x32),
+#endif /* CONFIG_X86_X32 */
 };
 
 static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
@@ -431,6 +483,12 @@ static inline long snd_ctl_ioctl_compat(struct file *file, unsigned int cmd, uns
 		return snd_ctl_elem_add_compat(ctl, argp, 0);
 	case SNDRV_CTL_IOCTL_ELEM_REPLACE32:
 		return snd_ctl_elem_add_compat(ctl, argp, 1);
+#ifdef CONFIG_X86_X32
+	case SNDRV_CTL_IOCTL_ELEM_READ_X32:
+		return snd_ctl_elem_read_user_x32(ctl->card, argp);
+	case SNDRV_CTL_IOCTL_ELEM_WRITE_X32:
+		return snd_ctl_elem_write_user_x32(ctl, argp);
+#endif /* CONFIG_X86_X32 */
 	}
 
 	down_read(&snd_ioctl_rwsem);
-- 
2.7.0

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#1358411 — [PATCH 4.2.y-ckt 26/98] KVM: x86: fix root cause for missed hardware breakpoints

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Paolo Bonzini <pbonzini@redhat.com>

commit 70e4da7a8ff62f2775337b705f45c804bb450454 upstream.

Commit 172b2386ed16 ("KVM: x86: fix missed hardware breakpoints",
2016-02-10) worked around a case where the debug registers are not loaded
correctly on preemption and on the first entry to KVM_RUN.

However, Xiao Guangrong pointed out that the root cause must be that
KVM_DEBUGREG_BP_ENABLED is not being set correctly.  This can indeed
happen due to the lazy debug exit mechanism, which does not call
kvm_update_dr7.  Fix it by replacing the existing loop (more or less
equivalent to kvm_update_dr0123) with calls to all the kvm_update_dr*
functions.

Fixes: 172b2386ed16a9143d9a456aae5ec87275c61489
Reviewed-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 arch/x86/kvm/x86.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f3265f4..9a16d3fd 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2836,7 +2836,6 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 
 	accumulate_steal_time(vcpu);
 	kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
-	vcpu->arch.switch_db_regs |= KVM_DEBUGREG_RELOAD;
 }
 
 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
@@ -6629,12 +6628,12 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 	 * KVM_DEBUGREG_WONT_EXIT again.
 	 */
 	if (unlikely(vcpu->arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT)) {
-		int i;
-
 		WARN_ON(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP);
 		kvm_x86_ops->sync_dirty_debug_regs(vcpu);
-		for (i = 0; i < KVM_NR_DB_REGS; i++)
-			vcpu->arch.eff_db[i] = vcpu->arch.db[i];
+		kvm_update_dr0123(vcpu);
+		kvm_update_dr6(vcpu);
+		kvm_update_dr7(vcpu);
+		vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD;
 	}
 
 	/*
-- 
2.7.0

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#1358412 — [PATCH 4.2.y-ckt 10/98] iwlwifi: mvm: inc pending frames counter also when txing non-sta

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Liad Kaufman <liad.kaufman@intel.com>

commit fb896c44f88a75843a072cd6961b1615732f7811 upstream.

Until this patch, when TXing non-sta the pending_frames counter
wasn't increased, but it WAS decreased in
iwl_mvm_rx_tx_cmd_single(), what makes it negative in certain
conditions. This in turn caused much trouble when we need to
remove the station since we won't be waiting forever until
pending_frames gets 0. In certain cases, we were exhausting
the station table even in BSS mode, because we had a lot of
stale stations.

Increase the counter also in iwl_mvm_tx_skb_non_sta() after a
successful TX to avoid this outcome.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
[ kamal: backport to 4.2: file rename ]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/net/wireless/iwlwifi/mvm/tx.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/wireless/iwlwifi/mvm/tx.c b/drivers/net/wireless/iwlwifi/mvm/tx.c
index 89116864..998f0ef 100644
--- a/drivers/net/wireless/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/iwlwifi/mvm/tx.c
@@ -397,6 +397,15 @@ int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
 		return -1;
 	}
 
+	/*
+	 * Increase the pending frames counter, so that later when a reply comes
+	 * in and the counter is decreased - we don't start getting negative
+	 * values.
+	 * Note that we don't need to make sure it isn't agg'd, since we're
+	 * TXing non-sta
+	 */
+	atomic_inc(&mvm->pending_frames[sta_id]);
+
 	return 0;
 }
 
-- 
2.7.0

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#1358413 — [PATCH 4.2.y-ckt 35/98] CIFS: Fix SMB2+ interim response processing for read requests

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Pavel Shilovsky <pshilovsky@samba.org>

commit 6cc3b24235929b54acd5ecc987ef11a425bd209e upstream.

For interim responses we only need to parse a header and update
a number credits. Now it is done for all SMB2+ command except
SMB2_READ which is wrong. Fix this by adding such processing.

Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Tested-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 fs/cifs/cifssmb.c | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 672ef35..5a6f639 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1394,11 +1394,10 @@ openRetry:
  * current bigbuf.
  */
 static int
-cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
+discard_remaining_data(struct TCP_Server_Info *server)
 {
 	unsigned int rfclen = get_rfc1002_length(server->smallbuf);
 	int remaining = rfclen + 4 - server->total_read;
-	struct cifs_readdata *rdata = mid->callback_data;
 
 	while (remaining > 0) {
 		int length;
@@ -1412,10 +1411,20 @@ cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
 		remaining -= length;
 	}
 
-	dequeue_mid(mid, rdata->result);
 	return 0;
 }
 
+static int
+cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
+{
+	int length;
+	struct cifs_readdata *rdata = mid->callback_data;
+
+	length = discard_remaining_data(server);
+	dequeue_mid(mid, rdata->result);
+	return length;
+}
+
 int
 cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
 {
@@ -1444,6 +1453,12 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
 		return length;
 	server->total_read += length;
 
+	if (server->ops->is_status_pending &&
+	    server->ops->is_status_pending(buf, server, 0)) {
+		discard_remaining_data(server);
+		return -1;
+	}
+
 	/* Was the SMB read successful? */
 	rdata->result = server->ops->map_error(buf, false);
 	if (rdata->result != 0) {
-- 
2.7.0

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#1358414 — [PATCH 4.2.y-ckt 16/98] mac80211: minstrel_ht: set default tx aggregation timeout to 0

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Felix Fietkau <nbd@openwrt.org>

commit 7a36b930e6ed4702c866dc74a5ad07318a57c688 upstream.

The value 5000 was put here with the addition of the timeout field to
ieee80211_start_tx_ba_session. It was originally added in mac80211 to
save resources for drivers like iwlwifi, which only supports a limited
number of concurrent aggregation sessions.

Since iwlwifi does not use minstrel_ht and other drivers don't need
this, 0 is a better default - especially since there have been
recent reports of aggregation setup related issues reproduced with
ath9k. This should improve stability without causing any adverse
effects.

Acked-by: Avery Pennarun <apenwarr@gmail.com>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 net/mac80211/rc80211_minstrel_ht.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index d3bdc66..e12006c 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -691,7 +691,7 @@ minstrel_aggr_check(struct ieee80211_sta *pubsta, struct sk_buff *skb)
 	if (likely(sta->ampdu_mlme.tid_tx[tid]))
 		return;
 
-	ieee80211_start_tx_ba_session(pubsta, tid, 5000);
+	ieee80211_start_tx_ba_session(pubsta, tid, 0);
 }
 
 static void
-- 
2.7.0

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#1358415 — [PATCH 4.2.y-ckt 02/98] tipc: fix nullptr crash during subscription cancel

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>

commit 4de13d7ed6ffdcbb34317acaa9236f121176f5f8 upstream.

commit 4d5cfcba2f6e ('tipc: fix connection abort during subscription
cancel'), removes the check for a valid subscription before calling
tipc_nametbl_subscribe().

This will lead to a nullptr exception when we process a
subscription cancel request. For a cancel request, a null
subscription is passed to tipc_nametbl_subscribe() resulting
in exception.

In this commit, we call tipc_nametbl_subscribe() only for
a valid subscription.

Fixes: 4d5cfcba2f6e ('tipc: fix connection abort during subscription cancel')
Reported-by: Anders Widell <anders.widell@ericsson.com>
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 net/tipc/subscr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/tipc/subscr.c b/net/tipc/subscr.c
index 69ee2ee..f9ff73a 100644
--- a/net/tipc/subscr.c
+++ b/net/tipc/subscr.c
@@ -296,7 +296,8 @@ static void tipc_subscrb_rcv_cb(struct net *net, int conid,
 	if (tipc_subscrp_create(net, (struct tipc_subscr *)buf, subscrb, &sub))
 		return tipc_conn_terminate(tn->topsrv, subscrb->conid);
 
-	tipc_nametbl_subscribe(sub);
+	if (sub)
+		tipc_nametbl_subscribe(sub);
 }
 
 /* Handle one request to establish a new subscriber */
-- 
2.7.0

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#1358417 — [PATCH 4.2.y-ckt 09/98] libata: fix HDIO_GET_32BIT ioctl

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Arnd Bergmann <arnd@arndb.de>

commit 287e6611ab1eac76c2c5ebf6e345e04c80ca9c61 upstream.

As reported by Soohoon Lee, the HDIO_GET_32BIT ioctl does not
work correctly in compat mode with libata.

I have investigated the issue further and found multiple problems
that all appeared with the same commit that originally introduced
HDIO_GET_32BIT handling in libata back in linux-2.6.8 and presumably
also linux-2.4, as the code uses "copy_to_user(arg, &val, 1)" to copy
a 'long' variable containing either 0 or 1 to user space.

The problems with this are:

* On big-endian machines, this will always write a zero because it
  stores the wrong byte into user space.

* In compat mode, the upper three bytes of the variable are updated
  by the compat_hdio_ioctl() function, but they now contain
  uninitialized stack data.

* The hdparm tool calling this ioctl uses a 'static long' variable
  to store the result. This means at least the upper bytes are
  initialized to zero, but calling another ioctl like HDIO_GET_MULTCOUNT
  would fill them with data that remains stale when the low byte
  is overwritten. Fortunately libata doesn't implement any of the
  affected ioctl commands, so this would only happen when we query
  both an IDE and an ATA device in the same command such as
  "hdparm -N -c /dev/hda /dev/sda"

* The libata code for unknown reasons started using ATA_IOC_GET_IO32
  and ATA_IOC_SET_IO32 as aliases for HDIO_GET_32BIT and HDIO_SET_32BIT,
  while the ioctl commands that were added later use the normal
  HDIO_* names. This is harmless but rather confusing.

This addresses all four issues by changing the code to use put_user()
on an 'unsigned long' variable in HDIO_GET_32BIT, like the IDE subsystem
does, and by clarifying the names of the ioctl commands.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reported-by: Soohoon Lee <Soohoon.Lee@f5.com>
Tested-by: Soohoon Lee <Soohoon.Lee@f5.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/ata/libata-scsi.c | 11 +++++------
 include/linux/ata.h       |  4 ++--
 2 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 0d7f0da..ae7cfcb 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -675,19 +675,18 @@ static int ata_ioc32(struct ata_port *ap)
 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
 		     int cmd, void __user *arg)
 {
-	int val = -EINVAL, rc = -EINVAL;
+	unsigned long val;
+	int rc = -EINVAL;
 	unsigned long flags;
 
 	switch (cmd) {
-	case ATA_IOC_GET_IO32:
+	case HDIO_GET_32BIT:
 		spin_lock_irqsave(ap->lock, flags);
 		val = ata_ioc32(ap);
 		spin_unlock_irqrestore(ap->lock, flags);
-		if (copy_to_user(arg, &val, 1))
-			return -EFAULT;
-		return 0;
+		return put_user(val, (unsigned long __user *)arg);
 
-	case ATA_IOC_SET_IO32:
+	case HDIO_SET_32BIT:
 		val = (unsigned long) arg;
 		rc = 0;
 		spin_lock_irqsave(ap->lock, flags);
diff --git a/include/linux/ata.h b/include/linux/ata.h
index d2992bf..c1a2f34 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -487,8 +487,8 @@ enum ata_tf_protocols {
 };
 
 enum ata_ioctls {
-	ATA_IOC_GET_IO32	= 0x309,
-	ATA_IOC_SET_IO32	= 0x324,
+	ATA_IOC_GET_IO32	= 0x309, /* HDIO_GET_32BIT */
+	ATA_IOC_SET_IO32	= 0x324, /* HDIO_SET_32BIT */
 };
 
 /* core structures */
-- 
2.7.0

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#1358418 — [PATCH 4.2.y-ckt 39/98] ALSA: hdspm: Fix wrong boolean ctl value accesses

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Takashi Iwai <tiwai@suse.de>

commit 537e48136295c5860a92138c5ea3959b9542868b upstream.

snd-hdspm driver accesses enum item values (int) instead of boolean
values (long) wrongly for some ctl elements.  This patch fixes them.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 sound/pci/rme9652/hdspm.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index cb666c7..67c90f0 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -2261,7 +2261,7 @@ static int snd_hdspm_put_system_sample_rate(struct snd_kcontrol *kcontrol,
 {
 	struct hdspm *hdspm = snd_kcontrol_chip(kcontrol);
 
-	hdspm_set_dds_value(hdspm, ucontrol->value.enumerated.item[0]);
+	hdspm_set_dds_value(hdspm, ucontrol->value.integer.value[0]);
 	return 0;
 }
 
@@ -4449,7 +4449,7 @@ static int snd_hdspm_get_tco_word_term(struct snd_kcontrol *kcontrol,
 {
 	struct hdspm *hdspm = snd_kcontrol_chip(kcontrol);
 
-	ucontrol->value.enumerated.item[0] = hdspm->tco->term;
+	ucontrol->value.integer.value[0] = hdspm->tco->term;
 
 	return 0;
 }
@@ -4460,8 +4460,8 @@ static int snd_hdspm_put_tco_word_term(struct snd_kcontrol *kcontrol,
 {
 	struct hdspm *hdspm = snd_kcontrol_chip(kcontrol);
 
-	if (hdspm->tco->term != ucontrol->value.enumerated.item[0]) {
-		hdspm->tco->term = ucontrol->value.enumerated.item[0];
+	if (hdspm->tco->term != ucontrol->value.integer.value[0]) {
+		hdspm->tco->term = ucontrol->value.integer.value[0];
 
 		hdspm_tco_write(hdspm);
 
-- 
2.7.0

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#1358419 — [PATCH 4.2.y-ckt 18/98] Revert "jffs2: Fix lock acquisition order bug in jffs2_write_begin"

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Thomas Betker <thomas.betker@rohde-schwarz.com>

commit 157078f64b8a9cd7011b6b900b2f2498df850748 upstream.

This reverts commit 5ffd3412ae55
("jffs2: Fix lock acquisition order bug in jffs2_write_begin").

The commit modified jffs2_write_begin() to remove a deadlock with
jffs2_garbage_collect_live(), but this introduced new deadlocks found
by multiple users. page_lock() actually has to be called before
mutex_lock(&c->alloc_sem) or mutex_lock(&f->sem) because
jffs2_write_end() and jffs2_readpage() are called with the page locked,
and they acquire c->alloc_sem and f->sem, resp.

In other words, the lock order in jffs2_write_begin() was correct, and
it is the jffs2_garbage_collect_live() path that has to be changed.

Revert the commit to get rid of the new deadlocks, and to clear the way
for a better fix of the original deadlock.

Reported-by: Deng Chao <deng.chao1@zte.com.cn>
Reported-by: Ming Liu <liu.ming50@gmail.com>
Reported-by: wangzaiwei <wangzaiwei@top-vision.cn>
Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 fs/jffs2/file.c | 39 ++++++++++++++++++---------------------
 1 file changed, 18 insertions(+), 21 deletions(-)

diff --git a/fs/jffs2/file.c b/fs/jffs2/file.c
index f509f62..3361979 100644
--- a/fs/jffs2/file.c
+++ b/fs/jffs2/file.c
@@ -137,39 +137,33 @@ static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
 	struct page *pg;
 	struct inode *inode = mapping->host;
 	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
-	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
-	struct jffs2_raw_inode ri;
-	uint32_t alloc_len = 0;
 	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
 	uint32_t pageofs = index << PAGE_CACHE_SHIFT;
 	int ret = 0;
 
-	jffs2_dbg(1, "%s()\n", __func__);
-
-	if (pageofs > inode->i_size) {
-		ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len,
-					  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
-		if (ret)
-			return ret;
-	}
-
-	mutex_lock(&f->sem);
 	pg = grab_cache_page_write_begin(mapping, index, flags);
-	if (!pg) {
-		if (alloc_len)
-			jffs2_complete_reservation(c);
-		mutex_unlock(&f->sem);
+	if (!pg)
 		return -ENOMEM;
-	}
 	*pagep = pg;
 
-	if (alloc_len) {
+	jffs2_dbg(1, "%s()\n", __func__);
+
+	if (pageofs > inode->i_size) {
 		/* Make new hole frag from old EOF to new page */
+		struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
+		struct jffs2_raw_inode ri;
 		struct jffs2_full_dnode *fn;
+		uint32_t alloc_len;
 
 		jffs2_dbg(1, "Writing new hole frag 0x%x-0x%x between current EOF and new page\n",
 			  (unsigned int)inode->i_size, pageofs);
 
+		ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len,
+					  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
+		if (ret)
+			goto out_page;
+
+		mutex_lock(&f->sem);
 		memset(&ri, 0, sizeof(ri));
 
 		ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
@@ -196,6 +190,7 @@ static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
 		if (IS_ERR(fn)) {
 			ret = PTR_ERR(fn);
 			jffs2_complete_reservation(c);
+			mutex_unlock(&f->sem);
 			goto out_page;
 		}
 		ret = jffs2_add_full_dnode_to_inode(c, f, fn);
@@ -210,10 +205,12 @@ static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
 			jffs2_mark_node_obsolete(c, fn->raw);
 			jffs2_free_full_dnode(fn);
 			jffs2_complete_reservation(c);
+			mutex_unlock(&f->sem);
 			goto out_page;
 		}
 		jffs2_complete_reservation(c);
 		inode->i_size = pageofs;
+		mutex_unlock(&f->sem);
 	}
 
 	/*
@@ -222,18 +219,18 @@ static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
 	 * case of a short-copy.
 	 */
 	if (!PageUptodate(pg)) {
+		mutex_lock(&f->sem);
 		ret = jffs2_do_readpage_nolock(inode, pg);
+		mutex_unlock(&f->sem);
 		if (ret)
 			goto out_page;
 	}
-	mutex_unlock(&f->sem);
 	jffs2_dbg(1, "end write_begin(). pg->flags %lx\n", pg->flags);
 	return ret;
 
 out_page:
 	unlock_page(pg);
 	page_cache_release(pg);
-	mutex_unlock(&f->sem);
 	return ret;
 }
 
-- 
2.7.0

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#1358420 — [PATCH 4.2.y-ckt 27/98] arm64: vmemmap: use virtual projection of linear region

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Ard Biesheuvel <ard.biesheuvel@linaro.org>

commit dfd55ad85e4a7fbaa82df12467515ac3c81e8a3e upstream.

Commit dd006da21646 ("arm64: mm: increase VA range of identity map") made
some changes to the memory mapping code to allow physical memory to reside
at an offset that exceeds the size of the virtual mapping.

However, since the size of the vmemmap area is proportional to the size of
the VA area, but it is populated relative to the physical space, we may
end up with the struct page array being mapped outside of the vmemmap
region. For instance, on my Seattle A0 box, I can see the following output
in the dmesg log.

   vmemmap : 0xffffffbdc0000000 - 0xffffffbfc0000000   (     8 GB maximum)
             0xffffffbfc0000000 - 0xffffffbfd0000000   (   256 MB actual)

We can fix this by deciding that the vmemmap region is not a projection of
the physical space, but of the virtual space above PAGE_OFFSET, i.e., the
linear region. This way, we are guaranteed that the vmemmap region is of
sufficient size, and we can even reduce the size by half.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 arch/arm64/include/asm/pgtable.h | 7 ++++---
 arch/arm64/mm/init.c             | 4 ++--
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index cf73194..514fb0c 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -33,17 +33,18 @@
 /*
  * VMALLOC and SPARSEMEM_VMEMMAP ranges.
  *
- * VMEMAP_SIZE: allows the whole VA space to be covered by a struct page array
+ * VMEMAP_SIZE: allows the whole linear region to be covered by a struct page array
  *	(rounded up to PUD_SIZE).
  * VMALLOC_START: beginning of the kernel VA space
  * VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space,
  *	fixed mappings and modules
  */
-#define VMEMMAP_SIZE		ALIGN((1UL << (VA_BITS - PAGE_SHIFT)) * sizeof(struct page), PUD_SIZE)
+#define VMEMMAP_SIZE		ALIGN((1UL << (VA_BITS - PAGE_SHIFT - 1)) * sizeof(struct page), PUD_SIZE)
 #define VMALLOC_START		(UL(0xffffffffffffffff) << VA_BITS)
 #define VMALLOC_END		(PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K)
 
-#define vmemmap			((struct page *)(VMALLOC_END + SZ_64K))
+#define VMEMMAP_START		(VMALLOC_END + SZ_64K)
+#define vmemmap			((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT))
 
 #define FIRST_USER_ADDRESS	0UL
 
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index ad87ce8..ae8f940 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -312,8 +312,8 @@ void __init mem_init(void)
 		  "      .data : 0x%p" " - 0x%p" "   (%6ld KB)\n",
 		  MLG(VMALLOC_START, VMALLOC_END),
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
-		  MLG((unsigned long)vmemmap,
-		      (unsigned long)vmemmap + VMEMMAP_SIZE),
+		  MLG(VMEMMAP_START,
+		      VMEMMAP_START + VMEMMAP_SIZE),
 		  MLM((unsigned long)virt_to_page(PAGE_OFFSET),
 		      (unsigned long)virt_to_page(high_memory)),
 #endif
-- 
2.7.0

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#1358421 — [PATCH 4.2.y-ckt 06/98] cfg80211/wext: fix message ordering

4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Johannes Berg <johannes.berg@intel.com>

commit cb150b9d23be6ee7f3a0fff29784f1c5b5ac514d upstream.

Since cfg80211 frequently takes actions from its netdev notifier
call, wireless extensions messages could still be ordered badly
since the wext netdev notifier, since wext is built into the
kernel, runs before the cfg80211 netdev notifier. For example,
the following can happen:

5: wlan1: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN group default
    link/ether 02:00:00:00:01:00 brd ff:ff:ff:ff:ff:ff
5: wlan1: <BROADCAST,MULTICAST,UP>
    link/ether

when setting the interface down causes the wext message.

To also fix this, export the wireless_nlevent_flush() function
and also call it from the cfg80211 notifier.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 include/net/iw_handler.h | 6 ++++++
 net/wireless/core.c      | 2 ++
 net/wireless/wext-core.c | 3 ++-
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/include/net/iw_handler.h b/include/net/iw_handler.h
index 8f81bbb..e0f4109 100644
--- a/include/net/iw_handler.h
+++ b/include/net/iw_handler.h
@@ -439,6 +439,12 @@ int dev_get_wireless_info(char *buffer, char **start, off_t offset, int length);
 /* Send a single event to user space */
 void wireless_send_event(struct net_device *dev, unsigned int cmd,
 			 union iwreq_data *wrqu, const char *extra);
+#ifdef CONFIG_WEXT_CORE
+/* flush all previous wext events - if work is done from netdev notifiers */
+void wireless_nlevent_flush(void);
+#else
+static inline void wireless_nlevent_flush(void) {}
+#endif
 
 /* We may need a function to send a stream of events to user space.
  * More on that later... */
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 2a0bbd2..71e9b84 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -1138,6 +1138,8 @@ static int cfg80211_netdev_notifier_call(struct notifier_block *nb,
 		return NOTIFY_DONE;
 	}
 
+	wireless_nlevent_flush();
+
 	return NOTIFY_OK;
 }
 
diff --git a/net/wireless/wext-core.c b/net/wireless/wext-core.c
index 87dd619..b50ee5d 100644
--- a/net/wireless/wext-core.c
+++ b/net/wireless/wext-core.c
@@ -342,7 +342,7 @@ static const int compat_event_type_size[] = {
 
 /* IW event code */
 
-static void wireless_nlevent_flush(void)
+void wireless_nlevent_flush(void)
 {
 	struct sk_buff *skb;
 	struct net *net;
@@ -355,6 +355,7 @@ static void wireless_nlevent_flush(void)
 				    GFP_KERNEL);
 	}
 }
+EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
 
 static int wext_netdev_notifier_call(struct notifier_block *nb,
 				     unsigned long state, void *ptr)
-- 
2.7.0

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