[PATCH 3.2 089/104] x86/spectre: Report get_user mitigation for spectre_v1

[Ben Hutchings]

3.2.101-rc1 review patch.  If anyone has any objections, please let me know.

--

From: Dan Williams 

commit edfbae53dab8348fca778531be9f4855d2ca0360 upstream.

Reflect the presence of get_user(), __get_user(), and 'syscall' protections
in sysfs. The expectation is that new and better tooling will allow the
kernel to grow more usages of array_index_nospec(), for now, only claim
mitigation for __user pointer de-references.

Reported-by: Jiri Slaby 
Signed-off-by: Dan Williams 
Signed-off-by: Thomas Gleixner 
Cc: linux-a...@vger.kernel.org
Cc: kernel-harden...@lists.openwall.com
Cc: gre...@linuxfoundation.org
Cc: torva...@linux-foundation.org
Cc: a...@linux.intel.com
Link: 
https://lkml.kernel.org/r/151727420158.33451.11658324346540434635.st...@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Ben Hutchings 
---
 arch/x86/kernel/cpu/bugs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -433,7 +433,7 @@ ssize_t cpu_show_spectre_v1(struct sysde
 {
if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1))
return sprintf(buf, "Not affected\n");
-   return sprintf(buf, "Vulnerable\n");
+   return sprintf(buf, "Mitigation: __user pointer sanitization\n");
 }
 
 ssize_t cpu_show_spectre_v2(struct sysdev_class *dev,

[PATCH 3.2 089/104] x86/spectre: Report get_user mitigation for spectre_v1

[Ben Hutchings]

3.2.101-rc1 review patch.  If anyone has any objections, please let me know.

--

From: Dan Williams 

commit edfbae53dab8348fca778531be9f4855d2ca0360 upstream.

Reflect the presence of get_user(), __get_user(), and 'syscall' protections
in sysfs. The expectation is that new and better tooling will allow the
kernel to grow more usages of array_index_nospec(), for now, only claim
mitigation for __user pointer de-references.

Reported-by: Jiri Slaby 
Signed-off-by: Dan Williams 
Signed-off-by: Thomas Gleixner 
Cc: linux-a...@vger.kernel.org
Cc: kernel-harden...@lists.openwall.com
Cc: gre...@linuxfoundation.org
Cc: torva...@linux-foundation.org
Cc: a...@linux.intel.com
Link: 
https://lkml.kernel.org/r/151727420158.33451.11658324346540434635.st...@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Ben Hutchings 
---
 arch/x86/kernel/cpu/bugs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -433,7 +433,7 @@ ssize_t cpu_show_spectre_v1(struct sysde
 {
if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1))
return sprintf(buf, "Not affected\n");
-   return sprintf(buf, "Vulnerable\n");
+   return sprintf(buf, "Mitigation: __user pointer sanitization\n");
 }
 
 ssize_t cpu_show_spectre_v2(struct sysdev_class *dev,