From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Will Deacon <will.deacon@arm.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: [PATCH 4.14 084/119] arm64/speculation: Support mitigations= cmdline option
Date: Sun, 27 Oct 2019 22:01:01 +0100 [thread overview]
Message-ID: <20191027203346.158163066@linuxfoundation.org> (raw)
In-Reply-To: <20191027203259.948006506@linuxfoundation.org>
From: Josh Poimboeuf <jpoimboe@redhat.com>
[ Upstream commit a111b7c0f20e13b54df2fa959b3dc0bdf1925ae6 ]
Configure arm64 runtime CPU speculation bug mitigations in accordance
with the 'mitigations=' cmdline option. This affects Meltdown, Spectre
v2, and Speculative Store Bypass.
The default behavior is unchanged.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
[will: reorder checks so KASLR implies KPTI and SSBS is affected by cmdline]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
Documentation/admin-guide/kernel-parameters.txt | 8 +++++---
arch/arm64/kernel/cpu_errata.c | 6 +++++-
arch/arm64/kernel/cpufeature.c | 8 +++++++-
3 files changed, 17 insertions(+), 5 deletions(-)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2389,8 +2389,8 @@
http://repo.or.cz/w/linux-2.6/mini2440.git
mitigations=
- [X86,PPC,S390] Control optional mitigations for CPU
- vulnerabilities. This is a set of curated,
+ [X86,PPC,S390,ARM64] Control optional mitigations for
+ CPU vulnerabilities. This is a set of curated,
arch-independent options, each of which is an
aggregation of existing arch-specific options.
@@ -2399,12 +2399,14 @@
improves system performance, but it may also
expose users to several CPU vulnerabilities.
Equivalent to: nopti [X86,PPC]
+ kpti=0 [ARM64]
nospectre_v1 [PPC]
nobp=0 [S390]
nospectre_v1 [X86]
- nospectre_v2 [X86,PPC,S390]
+ nospectre_v2 [X86,PPC,S390,ARM64]
spectre_v2_user=off [X86]
spec_store_bypass_disable=off [X86,PPC]
+ ssbd=force-off [ARM64]
l1tf=off [X86]
mds=off [X86]
--- a/arch/arm64/kernel/cpu_errata.c
+++ b/arch/arm64/kernel/cpu_errata.c
@@ -19,6 +19,7 @@
#include <linux/arm-smccc.h>
#include <linux/psci.h>
#include <linux/types.h>
+#include <linux/cpu.h>
#include <asm/cpu.h>
#include <asm/cputype.h>
#include <asm/cpufeature.h>
@@ -347,6 +348,9 @@ static bool has_ssbd_mitigation(const st
WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
+ if (cpu_mitigations_off())
+ ssbd_state = ARM64_SSBD_FORCE_DISABLE;
+
/* delay setting __ssb_safe until we get a firmware response */
if (is_midr_in_range_list(read_cpuid_id(), entry->midr_range_list))
this_cpu_safe = true;
@@ -544,7 +548,7 @@ check_branch_predictor(const struct arm6
}
/* forced off */
- if (__nospectre_v2) {
+ if (__nospectre_v2 || cpu_mitigations_off()) {
pr_info_once("spectrev2 mitigation disabled by command line option\n");
__hardenbp_enab = false;
return false;
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -24,6 +24,7 @@
#include <linux/stop_machine.h>
#include <linux/types.h>
#include <linux/mm.h>
+#include <linux/cpu.h>
#include <asm/cpu.h>
#include <asm/cpufeature.h>
#include <asm/cpu_ops.h>
@@ -841,7 +842,7 @@ static bool unmap_kernel_at_el0(const st
MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
};
- char const *str = "command line option";
+ char const *str = "kpti command line option";
bool meltdown_safe;
meltdown_safe = is_midr_in_range_list(read_cpuid_id(), kpti_safe_list);
@@ -871,6 +872,11 @@ static bool unmap_kernel_at_el0(const st
}
}
+ if (cpu_mitigations_off() && !__kpti_forced) {
+ str = "mitigations=off";
+ __kpti_forced = -1;
+ }
+
if (!IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0)) {
pr_info_once("kernel page table isolation disabled by kernel configuration\n");
return false;
next prev parent reply other threads:[~2019-10-27 21:34 UTC|newest]
Thread overview: 135+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-27 20:59 [PATCH 4.14 000/119] 4.14.151-stable review Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 001/119] scsi: ufs: skip shutdown if hba is not powered Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 002/119] scsi: megaraid: disable device when probe failed after enabled device Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 003/119] scsi: qla2xxx: Fix unbound sleep in fcport delete path Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 004/119] ARM: OMAP2+: Fix missing reset done flag for am3 and am43 Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 005/119] ieee802154: ca8210: prevent memory leak Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 006/119] ARM: dts: am4372: Set memory bandwidth limit for DISPC Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 007/119] net: dsa: qca8k: Use up to 7 ports for all operations Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 008/119] MIPS: dts: ar9331: fix interrupt-controller size Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 009/119] xen/efi: Set nonblocking callbacks Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 010/119] nl80211: fix null pointer dereference Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 011/119] mac80211: fix txq " Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 012/119] mips: Loongson: Fix the link time qualifier of serial_exit() Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 013/119] net: hisilicon: Fix usage of uninitialized variable in function mdio_sc_cfg_reg_write() Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 014/119] r8152: Set macpassthru in reset_resume callback Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 015/119] namespace: fix namespace.pl script to support relative paths Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 016/119] md/raid0: fix warning message for parameter default_layout Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 017/119] Revert "drm/radeon: Fix EEH during kexec" Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 018/119] ocfs2: fix panic due to ocfs2_wq is null Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 019/119] ipv4: Return -ENETUNREACH if we cant create route but saddr is valid Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 020/119] net: bcmgenet: Fix RGMII_MODE_EN value for GENET v1/2/3 Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 021/119] net: bcmgenet: Set phydev->dev_flags only for internal PHYs Greg Kroah-Hartman
2019-10-27 20:59 ` [PATCH 4.14 022/119] net: i82596: fix dma_alloc_attr for sni_82596 Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 023/119] net: stmmac: disable/enable ptp_ref_clk in suspend/resume flow Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 024/119] sctp: change sctp_prot .no_autobind with true Greg Kroah-Hartman
2019-10-31 7:54 ` Rantala, Tommi T. (Nokia - FI/Espoo)
2019-10-31 9:14 ` Xin Long
2019-10-31 12:09 ` Sasha Levin
2019-11-01 17:58 ` Xin Long
2019-11-01 18:48 ` Sasha Levin
2019-10-27 21:00 ` [PATCH 4.14 025/119] net: avoid potential infinite loop in tc_ctl_action() Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 026/119] MIPS: Treat Loongson Extensions as ASEs Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 027/119] MIPS: elf_hwcap: Export userspace ASEs Greg Kroah-Hartman
2019-10-29 10:50 ` Jiaxun Yang
2019-10-30 9:02 ` Greg Kroah-Hartman
2019-10-30 13:22 ` [PATCH] " Jiaxun Yang
2019-12-03 12:25 ` Greg KH
2019-10-30 13:23 ` Jiaxun Yang
2019-10-27 21:00 ` [PATCH 4.14 028/119] loop: Add LOOP_SET_DIRECT_IO to compat ioctl Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 029/119] memfd: Fix locking when tagging pins Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 030/119] USB: legousbtower: fix memleak on disconnect Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 031/119] ALSA: hda/realtek - Add support for ALC711 Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 032/119] usb: udc: lpc32xx: fix bad bit shift operation Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 033/119] USB: serial: ti_usb_3410_5052: fix port-close races Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 034/119] USB: ldusb: fix memleak on disconnect Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 035/119] USB: usblp: fix use-after-free " Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 036/119] USB: ldusb: fix read info leaks Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 037/119] arm64: sysreg: Move to use definitions for all the SCTLR bits Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 038/119] arm64: Expose support for optional ARMv8-A features Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 039/119] arm64: Fix the feature type for ID register fields Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 040/119] arm64: v8.4: Support for new floating point multiplication instructions Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 041/119] arm64: Documentation: cpu-feature-registers: Remove RES0 fields Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 042/119] arm64: Expose Arm v8.4 features Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 043/119] arm64: move SCTLR_EL{1,2} assertions to <asm/sysreg.h> Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 044/119] arm64: add PSR_AA32_* definitions Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 045/119] arm64: Introduce sysreg_clear_set() Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 046/119] arm64: capabilities: Update prototype for enable call back Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 047/119] arm64: capabilities: Move errata work around check on boot CPU Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 048/119] arm64: capabilities: Move errata processing code Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 049/119] arm64: capabilities: Prepare for fine grained capabilities Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 050/119] arm64: capabilities: Add flags to handle the conflicts on late CPU Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 051/119] arm64: capabilities: Unify the verification Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 052/119] arm64: capabilities: Filter the entries based on a given mask Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 053/119] arm64: capabilities: Prepare for grouping features and errata work arounds Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 054/119] arm64: capabilities: Split the processing of " Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 055/119] arm64: capabilities: Allow features based on local CPU scope Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 056/119] arm64: capabilities: Group handling of features and errata workarounds Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 057/119] arm64: capabilities: Introduce weak features based on local CPU Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 058/119] arm64: capabilities: Restrict KPTI detection to boot-time CPUs Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 059/119] arm64: capabilities: Add support for features enabled early Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 060/119] arm64: capabilities: Change scope of VHE to Boot CPU feature Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 061/119] arm64: capabilities: Clean up midr range helpers Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 062/119] arm64: Add helpers for checking CPU MIDR against a range Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 063/119] arm64: Add MIDR encoding for Arm Cortex-A55 and Cortex-A35 Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 064/119] arm64: capabilities: Add support for checks based on a list of MIDRs Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 065/119] arm64: KVM: Use SMCCC_ARCH_WORKAROUND_1 for Falkor BP hardening Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 066/119] arm64: dont zero DIT on signal return Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 067/119] arm64: Get rid of __smccc_workaround_1_hvc_* Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 068/119] arm64: cpufeature: Detect SSBS and advertise to userspace Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 069/119] arm64: ssbd: Add support for PSTATE.SSBS rather than trapping to EL3 Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 070/119] KVM: arm64: Set SCTLR_EL2.DSSBS if SSBD is forcefully disabled and !vhe Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 071/119] arm64: fix SSBS sanitization Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 072/119] arm64: Add sysfs vulnerability show for spectre-v1 Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 073/119] arm64: add sysfs vulnerability show for meltdown Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 074/119] arm64: enable generic CPU vulnerabilites support Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 075/119] arm64: Always enable ssb vulnerability detection Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 076/119] arm64: Provide a command line to disable spectre_v2 mitigation Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 077/119] arm64: Advertise mitigation of Spectre-v2, or lack thereof Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 078/119] arm64: Always enable spectre-v2 vulnerability detection Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 079/119] arm64: add sysfs vulnerability show for spectre-v2 Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 080/119] arm64: add sysfs vulnerability show for speculative store bypass Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 081/119] arm64: ssbs: Dont treat CPUs with SSBS as unaffected by SSB Greg Kroah-Hartman
2019-10-27 21:00 ` [PATCH 4.14 082/119] arm64: Force SSBS on context switch Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 083/119] arm64: Use firmware to detect CPUs that are not affected by Spectre-v2 Greg Kroah-Hartman
2019-10-27 21:01 ` Greg Kroah-Hartman [this message]
2019-10-27 21:01 ` [PATCH 4.14 085/119] MIPS: tlbex: Fix build_restore_pagemask KScratch restore Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 086/119] staging: wlan-ng: fix exit return when sme->key_idx >= NUM_WEPKEYS Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 087/119] scsi: sd: Ignore a failure to sync cache due to lack of authorization Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 088/119] scsi: core: save/restore command resid for error handling Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 089/119] scsi: core: try to get module before removing device Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 090/119] scsi: ch: Make it possible to open a ch device multiple times again Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 091/119] Input: da9063 - fix capability and drop KEY_SLEEP Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 092/119] Input: synaptics-rmi4 - avoid processing unknown IRQs Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 093/119] ASoC: rsnd: Reinitialize bit clock inversion flag for every format setting Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 094/119] cfg80211: wext: avoid copying malformed SSIDs Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 095/119] mac80211: Reject malformed SSID elements Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 096/119] drm/edid: Add 6 bpc quirk for SDC panel in Lenovo G50 Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 097/119] drm/amdgpu: Bail earlier when amdgpu.cik_/si_support is not set to 1 Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 098/119] drivers/base/memory.c: dont access uninitialized memmaps in soft_offline_page_store() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 099/119] fs/proc/page.c: dont access uninitialized memmaps in fs/proc/page.c Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 100/119] scsi: zfcp: fix reaction on bit error threshold notification Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 101/119] mm/slub: fix a deadlock in show_slab_objects() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 102/119] mm/page_owner: dont access uninitialized memmaps when reading /proc/pagetypeinfo Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 103/119] hugetlbfs: dont access uninitialized memmaps in pfn_range_valid_gigantic() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 104/119] xtensa: drop EXPORT_SYMBOL for outs*/ins* Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 105/119] parisc: Fix vmap memory leak in ioremap()/iounmap() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 106/119] CIFS: avoid using MID 0xFFFF Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 107/119] x86/boot/64: Make level2_kernel_pgt pages invalid outside kernel area Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 108/119] pinctrl: armada-37xx: fix control of pins 32 and up Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 109/119] pinctrl: armada-37xx: swap polarity on LED group Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 110/119] btrfs: block-group: Fix a memory leak due to missing btrfs_put_block_group() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 111/119] memstick: jmb38x_ms: Fix an error handling path in jmb38x_ms_probe() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 112/119] cpufreq: Avoid cpufreq_suspend() deadlock on system shutdown Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 113/119] xen/netback: fix error path of xenvif_connect_data() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 114/119] PCI: PM: Fix pci_power_up() Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 115/119] KVM: X86: introduce invalidate_gpa argument to tlb flush Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 116/119] kvm: vmx: Introduce lapic_mode enumeration Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 117/119] kvm: apic: Flush TLB after APIC mode/address change if VPIDs are in use Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 118/119] kvm: vmx: Basic APIC virtualization controls have three settings Greg Kroah-Hartman
2019-10-27 21:01 ` [PATCH 4.14 119/119] RDMA/cxgb4: Do not dma memory off of the stack Greg Kroah-Hartman
2019-10-28 2:35 ` [PATCH 4.14 000/119] 4.14.151-stable review kernelci.org bot
2019-10-28 5:59 ` Didik Setiawan
2019-10-28 13:35 ` Guenter Roeck
2019-10-28 21:39 ` Jon Hunter
2019-10-29 7:15 ` Naresh Kamboju
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