Commit-ID: bb4b3b7762735cdaba5a40fd94c9303d9ffa147a Gitweb: https://git.kernel.org/tip/bb4b3b7762735cdaba5a40fd94c9303d9ffa147a Author: Jiri Kosina <jkosina@xxxxxxx> AuthorDate: Tue, 25 Sep 2018 14:39:28 +0200 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Wed, 26 Sep 2018 14:26:52 +0200 x86/speculation: Propagate information about RSB filling mitigation to sysfs If spectrev2 mitigation has been enabled, RSB is filled on context switch in order to protect from various classes of spectrev2 attacks. If this mitigation is enabled, say so in sysfs for spectrev2. Signed-off-by: Jiri Kosina <jkosina@xxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: "WoodhouseDavid" <dwmw@xxxxxxxxxxxx> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx> Cc: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx> Cc: "SchauflerCasey" <casey.schaufler@xxxxxxxxx> Link: https://lkml.kernel.org/r/nycvar.YFH.7.76.1809251438580.15880@xxxxxxxxxxxxx --- arch/x86/kernel/cpu/bugs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 53eb14a65610..fe32103fcdc7 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -874,10 +874,11 @@ static ssize_t cpu_show_common(struct device *dev, struct device_attribute *attr return sprintf(buf, "Mitigation: __user pointer sanitization\n"); case X86_BUG_SPECTRE_V2: - ret = sprintf(buf, "%s%s%s%s%s\n", spectre_v2_strings[spectre_v2_enabled], + ret = sprintf(buf, "%s%s%s%s%s%s\n", spectre_v2_strings[spectre_v2_enabled], boot_cpu_has(X86_FEATURE_USE_IBPB) ? ", IBPB" : "", boot_cpu_has(X86_FEATURE_USE_IBRS_FW) ? ", IBRS_FW" : "", (x86_spec_ctrl_base & SPEC_CTRL_STIBP) ? ", STIBP" : "", + boot_cpu_has(X86_FEATURE_RSB_CTXSW) ? ", RSB filling" : "", spectre_v2_module_string()); return ret;
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