diff options
Diffstat (limited to 'common/recipes-kernel/linux/linux-yocto-4.9.21/0054-x86-cpu-Implement-CPU-vulnerabilites-sysfs-functions.patch')
| -rw-r--r-- | common/recipes-kernel/linux/linux-yocto-4.9.21/0054-x86-cpu-Implement-CPU-vulnerabilites-sysfs-functions.patch | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/common/recipes-kernel/linux/linux-yocto-4.9.21/0054-x86-cpu-Implement-CPU-vulnerabilites-sysfs-functions.patch b/common/recipes-kernel/linux/linux-yocto-4.9.21/0054-x86-cpu-Implement-CPU-vulnerabilites-sysfs-functions.patch new file mode 100644 index 00000000..a185b426 --- /dev/null +++ b/common/recipes-kernel/linux/linux-yocto-4.9.21/0054-x86-cpu-Implement-CPU-vulnerabilites-sysfs-functions.patch @@ -0,0 +1,86 @@ +From 3e068e333715968e6b23151273aba17a960e2bae Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Sun, 7 Jan 2018 22:48:01 +0100 +Subject: [PATCH 054/102] x86/cpu: Implement CPU vulnerabilites sysfs functions + +commit 61dc0f555b5c761cdafb0ba5bd41ecf22d68a4c4 upstream. + +Implement the CPU vulnerabilty show functions for meltdown, spectre_v1 and +spectre_v2. + +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/20180107214913.177414879@linutronix.de +Signed-off-by: Razvan Ghitulete <rga@amazon.de> +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + arch/x86/Kconfig | 1 + + arch/x86/kernel/cpu/bugs.c | 29 +++++++++++++++++++++++++++++ + 2 files changed, 30 insertions(+) + +diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig +index 5572997..7877ff0 100644 +--- a/arch/x86/Kconfig ++++ b/arch/x86/Kconfig +@@ -64,6 +64,7 @@ config X86 + select GENERIC_CLOCKEVENTS_MIN_ADJUST + select GENERIC_CMOS_UPDATE + select GENERIC_CPU_AUTOPROBE ++ select GENERIC_CPU_VULNERABILITIES + select GENERIC_EARLY_IOREMAP + select GENERIC_FIND_FIRST_BIT + select GENERIC_IOMAP +diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c +index a44ef52..cb6b4f9 100644 +--- a/arch/x86/kernel/cpu/bugs.c ++++ b/arch/x86/kernel/cpu/bugs.c +@@ -9,6 +9,7 @@ + */ + #include <linux/init.h> + #include <linux/utsname.h> ++#include <linux/cpu.h> + #include <asm/bugs.h> + #include <asm/processor.h> + #include <asm/processor-flags.h> +@@ -59,3 +60,31 @@ void __init check_bugs(void) + set_memory_4k((unsigned long)__va(0), 1); + #endif + } ++ ++#ifdef CONFIG_SYSFS ++ssize_t cpu_show_meltdown(struct device *dev, ++ struct device_attribute *attr, char *buf) ++{ ++ if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN)) ++ return sprintf(buf, "Not affected\n"); ++ if (boot_cpu_has(X86_FEATURE_KAISER)) ++ return sprintf(buf, "Mitigation: PTI\n"); ++ return sprintf(buf, "Vulnerable\n"); ++} ++ ++ssize_t cpu_show_spectre_v1(struct device *dev, ++ struct device_attribute *attr, char *buf) ++{ ++ if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1)) ++ return sprintf(buf, "Not affected\n"); ++ return sprintf(buf, "Vulnerable\n"); ++} ++ ++ssize_t cpu_show_spectre_v2(struct device *dev, ++ struct device_attribute *attr, char *buf) ++{ ++ if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V2)) ++ return sprintf(buf, "Not affected\n"); ++ return sprintf(buf, "Vulnerable\n"); ++} ++#endif +-- +2.7.4 + |