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Date: Fri, 23 Feb 2018 11:42:07 +0100
From: Jack Wang <jinpu.wang@...fitbricks.com>
To: gregkh@...uxfoundation.org,
stable@...r.kernel.org
Cc: Dan Williams <dan.j.williams@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
linux-arch@...r.kernel.org,
kernel-hardening@...ts.openwall.com,
torvalds@...ux-foundation.org,
alan@...ux.intel.com,
David Woodhouse <dwmw@...zon.co.uk>,
Jack Wang <jinpu.wang@...fitbricks.com>
Subject: [stable 4.4 18/29] x86/spectre: Report get_user mitigation for spectre_v1
From: Dan Williams <dan.j.williams@...el.com>
(cherry picked from commit edfbae53dab8348fca778531be9f4855d2ca0360)
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 <jslaby@...e.cz>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-arch@...r.kernel.org
Cc: kernel-hardening@...ts.openwall.com
Cc: gregkh@...uxfoundation.org
Cc: torvalds@...ux-foundation.org
Cc: alan@...ux.intel.com
Link: https://lkml.kernel.org/r/151727420158.33451.11658324346540434635.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[jwang: cherry pick to 4.4]
Signed-off-by: Jack Wang <jinpu.wang@...fitbricks.com>
---
arch/x86/kernel/cpu/bugs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index d3b8337..812813e 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -291,7 +291,7 @@ ssize_t cpu_show_spectre_v1(struct device *dev,
{
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 device *dev,
--
2.7.4
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