Commit-ID: bb4b3b7762735cdaba5a40fd94c9303d9ffa147a Gitweb: https://git.kernel.org/tip/bb4b3b7762735cdaba5a40fd94c9303d9ffa147a Author: Jiri Kosina <[email protected]> AuthorDate: Tue, 25 Sep 2018 14:39:28 +0200 Committer: Thomas Gleixner <[email protected]> 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 <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Josh Poimboeuf <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: "WoodhouseDavid" <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Tim Chen <[email protected]> Cc: "SchauflerCasey" <[email protected]> Link: https://lkml.kernel.org/r/[email protected] --- 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;
