diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0054-sysfs-cpu-Add-vulnerability-folder.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0054-sysfs-cpu-Add-vulnerability-folder.patch | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0054-sysfs-cpu-Add-vulnerability-folder.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0054-sysfs-cpu-Add-vulnerability-folder.patch deleted file mode 100644 index a7a0183b..00000000 --- a/common/recipes-kernel/linux/linux-yocto-4.9.21/0054-sysfs-cpu-Add-vulnerability-folder.patch +++ /dev/null @@ -1,157 +0,0 @@ -From a03760456446357758d4f6702df7cb9446e022e0 Mon Sep 17 00:00:00 2001 -From: Thomas Gleixner <tglx@linutronix.de> -Date: Sun, 7 Jan 2018 22:48:00 +0100 -Subject: [PATCH 054/103] sysfs/cpu: Add vulnerability folder - -commit 87590ce6e373d1a5401f6539f0c59ef92dd924a9 upstream. - -As the meltdown/spectre problem affects several CPU architectures, it makes -sense to have common way to express whether a system is affected by a -particular vulnerability or not. If affected the way to express the -mitigation should be common as well. - -Create /sys/devices/system/cpu/vulnerabilities folder and files for -meltdown, spectre_v1 and spectre_v2. - -Allow architectures to override the show function. - -Signed-off-by: Thomas Gleixner <tglx@linutronix.de> -Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> -Cc: Peter Zijlstra <peterz@infradead.org> -Cc: Will Deacon <will.deacon@arm.com> -Cc: Dave Hansen <dave.hansen@intel.com> -Cc: Linus Torvalds <torvalds@linuxfoundation.org> -Cc: Borislav Petkov <bp@alien8.de> -Cc: David Woodhouse <dwmw@amazon.co.uk> -Link: https://lkml.kernel.org/r/20180107214913.096657732@linutronix.de -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - Documentation/ABI/testing/sysfs-devices-system-cpu | 16 ++++++++ - drivers/base/Kconfig | 3 ++ - drivers/base/cpu.c | 48 ++++++++++++++++++++++ - include/linux/cpu.h | 7 ++++ - 4 files changed, 74 insertions(+) - -diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu -index 4987417..8b30a48 100644 ---- a/Documentation/ABI/testing/sysfs-devices-system-cpu -+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu -@@ -350,3 +350,19 @@ Contact: Linux ARM Kernel Mailing list <linux-arm-kernel@lists.infradead.org> - Description: AArch64 CPU registers - 'identification' directory exposes the CPU ID registers for - identifying model and revision of the CPU. -+ -+What: /sys/devices/system/cpu/vulnerabilities -+ /sys/devices/system/cpu/vulnerabilities/meltdown -+ /sys/devices/system/cpu/vulnerabilities/spectre_v1 -+ /sys/devices/system/cpu/vulnerabilities/spectre_v2 -+Date: Januar 2018 -+Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> -+Description: Information about CPU vulnerabilities -+ -+ The files are named after the code names of CPU -+ vulnerabilities. The output of those files reflects the -+ state of the CPUs in the system. Possible output values: -+ -+ "Not affected" CPU is not affected by the vulnerability -+ "Vulnerable" CPU is affected and no mitigation in effect -+ "Mitigation: $M" CPU is affetcted and mitigation $M is in effect -diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig -index d02e7c0..0651010 100644 ---- a/drivers/base/Kconfig -+++ b/drivers/base/Kconfig -@@ -235,6 +235,9 @@ config GENERIC_CPU_DEVICES - config GENERIC_CPU_AUTOPROBE - bool - -+config GENERIC_CPU_VULNERABILITIES -+ bool -+ - config SOC_BUS - bool - -diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c -index 4c28e1a..56b6c85 100644 ---- a/drivers/base/cpu.c -+++ b/drivers/base/cpu.c -@@ -499,10 +499,58 @@ static void __init cpu_dev_register_generic(void) - #endif - } - -+#ifdef CONFIG_GENERIC_CPU_VULNERABILITIES -+ -+ssize_t __weak cpu_show_meltdown(struct device *dev, -+ struct device_attribute *attr, char *buf) -+{ -+ return sprintf(buf, "Not affected\n"); -+} -+ -+ssize_t __weak cpu_show_spectre_v1(struct device *dev, -+ struct device_attribute *attr, char *buf) -+{ -+ return sprintf(buf, "Not affected\n"); -+} -+ -+ssize_t __weak cpu_show_spectre_v2(struct device *dev, -+ struct device_attribute *attr, char *buf) -+{ -+ return sprintf(buf, "Not affected\n"); -+} -+ -+static DEVICE_ATTR(meltdown, 0444, cpu_show_meltdown, NULL); -+static DEVICE_ATTR(spectre_v1, 0444, cpu_show_spectre_v1, NULL); -+static DEVICE_ATTR(spectre_v2, 0444, cpu_show_spectre_v2, NULL); -+ -+static struct attribute *cpu_root_vulnerabilities_attrs[] = { -+ &dev_attr_meltdown.attr, -+ &dev_attr_spectre_v1.attr, -+ &dev_attr_spectre_v2.attr, -+ NULL -+}; -+ -+static const struct attribute_group cpu_root_vulnerabilities_group = { -+ .name = "vulnerabilities", -+ .attrs = cpu_root_vulnerabilities_attrs, -+}; -+ -+static void __init cpu_register_vulnerabilities(void) -+{ -+ if (sysfs_create_group(&cpu_subsys.dev_root->kobj, -+ &cpu_root_vulnerabilities_group)) -+ pr_err("Unable to register CPU vulnerabilities\n"); -+} -+ -+#else -+static inline void cpu_register_vulnerabilities(void) { } -+#endif -+ - void __init cpu_dev_init(void) - { - if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups)) - panic("Failed to register CPU subsystem"); - - cpu_dev_register_generic(); -+ cpu_register_vulnerabilities(); - } -diff --git a/include/linux/cpu.h b/include/linux/cpu.h -index e571128..2f475ad 100644 ---- a/include/linux/cpu.h -+++ b/include/linux/cpu.h -@@ -44,6 +44,13 @@ extern void cpu_remove_dev_attr(struct device_attribute *attr); - extern int cpu_add_dev_attr_group(struct attribute_group *attrs); - extern void cpu_remove_dev_attr_group(struct attribute_group *attrs); - -+extern ssize_t cpu_show_meltdown(struct device *dev, -+ struct device_attribute *attr, char *buf); -+extern ssize_t cpu_show_spectre_v1(struct device *dev, -+ struct device_attribute *attr, char *buf); -+extern ssize_t cpu_show_spectre_v2(struct device *dev, -+ struct device_attribute *attr, char *buf); -+ - extern __printf(4, 5) - struct device *cpu_device_create(struct device *parent, void *drvdata, - const struct attribute_group **groups, --- -2.7.4 - |