[patch V8 07/15] SSB 7

[Thomas Gleixner <tglx@linutronix.de>]

Contemporary high performance processors use a common industry-wide
optimization known as "Speculative Store Bypass" in which loads from
addresses to which a recent store has occurred may (speculatively) see an
older value. Intel refers to this feature as "Memory Disambiguation" which
is part of their "Smart Memory Access" capability in Nehalem and later
generation processors.

Some processors have an implementation bug that enables a cache
side-channel attack against such speculatively read values. An attacker can
create exploit code that allows them to read memory outside of a sandbox
environment (for example, malicious JavaScript in a web page), or to
perform more complex attacks against code running within the same privilege
level, e.g. via the stack.

Provide two command line control knobs:

 nospec_store_bypass_disable
 spec_store_bypass_disable=[off,auto,on]

By default affected x86 processors will power on with Speculative
Store Bypass enabled. Hence the provided kernel parameters are written
from the point of view of whether to enable a mitigation or not.
The parameters are as follows:

 - auto - kernel detects whether your CPU model contains a
	  vulnerable implementation of Speculative Store
	  Bypass and picks the most appropriate mitigation

	  Some CPUs may have a Speculative Store Bypass implementation
	  which is not vulnerable to the described attacks.  For those, the
	  'auto' (default) option will pick the right choice.

 - on   - disable Speculative Store Bypass
 - off  - enable Speculative Store Bypass

[ tglx: Reordered the checks so that the whole evaluation is not done
  	when the CPU does not support RDS ]

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>

---
v1.3:
 - Wrong array was used when figuring mdd_v4= arguments
 - If broken microcode found, also disable MD feature.
 - s/mdd_v4/mdd/
 - s/kernel/userpsace/
 - Fix up the commit description
v1.4:
 - Incorporate various feedback and suggestions from Jon Masters
 - Change mdd parameters to allow only big hammer on/off for now
 - Introduce "ssbd" industry standard term for cross-architecture
 - Use mdd_ and MDD_ prefixes to clearly spell out that "enable"
   means we are actually disabling a CPU processor feature (MD)
v2:
 - s/mdd/ssb/ in the x86 code to match with the 'ssb' part
v3:
 - rip out mdd.
 - remove 'Haswell' and such and replace with 'contemporary'
 - s/ssb/spec_store_bypass/ and various other cleanups (Jon Masters)
v4: Rip out 'Memory Disambiguation Disable'
 - Fix up documentation.
 - Rip out the X86_FEATURE_STBUF_BYPASS
 - s/X86_FEATURE_STBUF_MITIGATE/X86_FEATURE_STBUF_BYPASS_MITIGATE/
 - On the functions change spec_store_bypass_ to ssb_
v5: Changed title.
  - s/X86_FEATURE_STBUF_BYPASS_MITIGATE/X86_FEATURE_SPEC_STORE_BYPASS_DISABLE/
  - Add logic to get out of ssb_parse_cmdline is bug is not present
---
 Documentation/admin-guide/kernel-parameters.txt |   33 +++++++
 arch/x86/include/asm/cpufeatures.h              |    1 
 arch/x86/include/asm/nospec-branch.h            |    6 +
 arch/x86/kernel/cpu/bugs.c                      |  103 ++++++++++++++++++++++++
 4 files changed, 143 insertions(+)

--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2680,6 +2680,9 @@
 			allow data leaks with this option, which is equivalent
 			to spectre_v2=off.
 
+	nospec_store_bypass_disable
+			[HW] Disable all mitigations for the Speculative Store Bypass vulnerability
+
 	noxsave		[BUGS=X86] Disables x86 extended register state save
 			and restore using xsave. The kernel will fallback to
 			enabling legacy floating-point and sse state.
@@ -4025,6 +4028,36 @@
 			Not specifying this option is equivalent to
 			spectre_v2=auto.
 
+	spec_store_bypass_disable=
+			[HW] Control Speculative Store Bypass (SSB) Disable mitigation
+			(Speculative Store Bypass vulnerability)
+
+			Certain CPUs are vulnerable to an exploit against a
+			a common industry wide performance optimization known
+			as "Speculative Store Bypass" in which recent stores
+			to the same memory location may not be observed by
+			later loads during speculative execution. The idea
+			is that such stores are unlikely and that they can
+			be detected prior to instruction retirement at the
+			end of a particular speculation execution window.
+
+			In vulnerable processors, the speculatively forwarded
+			store can be used in a cache side channel attack, for
+			example to read memory to which the attacker does not
+			directly have access (e.g. inside sandboxed code).
+
+			This parameter controls whether the Speculative Store
+			Bypass optimization is used.
+
+			on     - Unconditionally disable Speculative Store Bypass
+			off    - Unconditionally enable Speculative Store Bypass
+			auto   - Kernel detects whether the CPU model contains a
+			         vulnerable implementation of Speculative Store
+			         Bypass and picks the most appropriate mitigation
+
+			Not specifying this option is equivalent to
+			spec_store_bypass_disable=auto.
+
 	spia_io_base=	[HW,MTD]
 	spia_fio_base=
 	spia_pedr=
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -214,6 +214,7 @@
 
 #define X86_FEATURE_USE_IBPB		( 7*32+21) /* "" Indirect Branch Prediction Barrier enabled */
 #define X86_FEATURE_USE_IBRS_FW		( 7*32+22) /* "" Use IBRS during runtime firmware calls */
+#define X86_FEATURE_SPEC_STORE_BYPASS_DISABLE	( 7*32+23) /* "" Disable Speculative Store Bypass. */
 
 /* Virtualization flags: Linux defined, word 8 */
 #define X86_FEATURE_TPR_SHADOW		( 8*32+ 0) /* Intel TPR Shadow */
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -238,6 +238,12 @@ extern u64 x86_get_default_spec_ctrl(voi
 extern void x86_set_guest_spec_ctrl(u64);
 extern void x86_restore_host_spec_ctrl(u64);
 
+/* The Speculative Store Bypass disable variants */
+enum ssb_mitigation {
+	SPEC_STORE_BYPASS_NONE,
+	SPEC_STORE_BYPASS_DISABLE,
+};
+
 extern char __indirect_thunk_start[];
 extern char __indirect_thunk_end[];
 
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -27,6 +27,7 @@
 #include <asm/intel-family.h>
 
 static void __init spectre_v2_select_mitigation(void);
+static void __init ssb_select_mitigation(void);
 
 /*
  * Our boot-time value of SPEC_CTRL MSR. We read it once so that any
@@ -53,6 +54,12 @@ void __init check_bugs(void)
 	/* Select the proper spectre mitigation before patching alternatives */
 	spectre_v2_select_mitigation();
 
+	/*
+	 * Select proper mitigation for any exposure to the Speculative Store
+	 * Bypass vulnerability.
+	 */
+	ssb_select_mitigation();
+
 #ifdef CONFIG_X86_32
 	/*
 	 * Check whether we are able to run this kernel safely on SMP.
@@ -358,6 +365,99 @@ static void __init spectre_v2_select_mit
 }
 
 #undef pr_fmt
+#define pr_fmt(fmt)	"Speculative Store Bypass: " fmt
+
+static enum ssb_mitigation ssb_mode = SPEC_STORE_BYPASS_NONE;
+
+/* The kernel command line selection */
+enum ssb_mitigation_cmd {
+	SPEC_STORE_BYPASS_CMD_NONE,
+	SPEC_STORE_BYPASS_CMD_AUTO,
+	SPEC_STORE_BYPASS_CMD_ON,
+};
+
+static const char *ssb_strings[] = {
+	[SPEC_STORE_BYPASS_NONE]	= "Vulnerable",
+	[SPEC_STORE_BYPASS_DISABLE]	= "Mitigation: Speculative Store Bypass disabled"
+};
+
+static const struct {
+	const char *option;
+	enum ssb_mitigation_cmd cmd;
+} ssb_mitigation_options[] = {
+	{ "auto",	SPEC_STORE_BYPASS_CMD_AUTO }, /* Platform decides */
+	{ "on",		SPEC_STORE_BYPASS_CMD_ON },   /* Disable Speculative Store Bypass */
+	{ "off",	SPEC_STORE_BYPASS_CMD_NONE }, /* Don't touch Speculative Store Bypass */
+};
+
+static enum ssb_mitigation_cmd __init ssb_parse_cmdline(void)
+{
+	enum ssb_mitigation_cmd cmd = SPEC_STORE_BYPASS_CMD_AUTO;
+	char arg[20];
+	int ret, i;
+
+	if (cmdline_find_option_bool(boot_command_line, "nospec_store_bypass_disable")) {
+		return SPEC_STORE_BYPASS_CMD_NONE;
+	} else {
+		ret = cmdline_find_option(boot_command_line, "spec_store_bypass_disable",
+					  arg, sizeof(arg));
+		if (ret < 0)
+			return SPEC_STORE_BYPASS_CMD_AUTO;
+
+		for (i = 0; i < ARRAY_SIZE(ssb_mitigation_options); i++) {
+			if (!match_option(arg, ret, ssb_mitigation_options[i].option))
+				continue;
+
+			cmd = ssb_mitigation_options[i].cmd;
+			break;
+		}
+
+		if (i >= ARRAY_SIZE(ssb_mitigation_options)) {
+			pr_err("unknown option (%s). Switching to AUTO select\n", arg);
+			return SPEC_STORE_BYPASS_CMD_AUTO;
+		}
+	}
+
+	return cmd;
+}
+
+static enum ssb_mitigation_cmd __init __ssb_select_mitigation(void)
+{
+	enum ssb_mitigation mode = SPEC_STORE_BYPASS_NONE;
+	enum ssb_mitigation_cmd cmd;
+
+	if (!boot_cpu_has(X86_FEATURE_RDS))
+		return mode;
+
+	cmd = ssb_parse_cmdline();
+	if (!boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS) &&
+	    (cmd == SPEC_STORE_BYPASS_CMD_NONE ||
+	     cmd == SPEC_STORE_BYPASS_CMD_AUTO))
+		return mode;
+
+	switch (cmd) {
+	case SPEC_STORE_BYPASS_CMD_AUTO:
+	case SPEC_STORE_BYPASS_CMD_ON:
+		mode = SPEC_STORE_BYPASS_DISABLE;
+		break;
+	case SPEC_STORE_BYPASS_CMD_NONE:
+		break;
+	}
+
+	if (mode != SPEC_STORE_BYPASS_NONE)
+		setup_force_cpu_cap(X86_FEATURE_SPEC_STORE_BYPASS_DISABLE);
+	return mode;
+}
+
+static void ssb_select_mitigation()
+{
+	ssb_mode = __ssb_select_mitigation();
+
+	if (boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS))
+		pr_info("%s\n", ssb_strings[ssb_mode]);
+}
+
+#undef pr_fmt
 
 #ifdef CONFIG_SYSFS
 
@@ -383,6 +483,9 @@ ssize_t cpu_show_common(struct device *d
 			       boot_cpu_has(X86_FEATURE_USE_IBRS_FW) ? ", IBRS_FW" : "",
 			       spectre_v2_module_string());
 
+	case X86_BUG_SPEC_STORE_BYPASS:
+		return sprintf(buf, "%s\n", ssb_strings[ssb_mode]);
+
 	default:
 		break;
 	}