From 4b3ea2d776bfd5019fb1e944a8527f24434f81d3 Mon Sep 17 00:00:00 2001
From: Kostya Serebryany <kcc@google.com>
Date: Fri, 10 Feb 2017 22:50:44 +0000
Subject: [PATCH] s390 CVE-2016-2143 whitelist for RHEL kernels

Summary: This patch adds whitelist for RHEL6 and RHEL7 kernels that are known to have the CVE fixed.

Reviewers: koriakin, kcc

Reviewed By: kcc

Subscribers: kubamracek

Differential Revision: https://reviews.llvm.org/D29825

llvm-svn: 294799
---
 .../sanitizer_common/sanitizer_linux_s390.cc  | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux_s390.cc b/compiler-rt/lib/sanitizer_common/sanitizer_linux_s390.cc
index 053fd174b2bf..c2b03b27e66c 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_linux_s390.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux_s390.cc
@@ -136,6 +136,18 @@ static bool FixedCVE_2016_2143() {
   if (ptr[0] == '.')
     patch = internal_simple_strtoll(ptr+1, &ptr, 10);
   if (major < 3) {
+    if (major == 2 && minor == 6 && patch == 32 && ptr[0] == '-' &&
+        internal_strstr(ptr, ".el6")) {
+      // Check RHEL6
+      int r1 = internal_simple_strtoll(ptr+1, &ptr, 10);
+      if (r1 >= 657) // 2.6.32-657.el6 or later
+        return true;
+      if (r1 == 642 && ptr[0] == '.') {
+        int r2 = internal_simple_strtoll(ptr+1, &ptr, 10);
+        if (r2 >= 9) // 2.6.32-642.9.1.el6 or later
+          return true;
+      }
+    }
     // <3.0 is bad.
     return false;
   } else if (major == 3) {
@@ -145,6 +157,18 @@ static bool FixedCVE_2016_2143() {
     // 3.12.58+ is OK.
     if (minor == 12 && patch >= 58)
       return true;
+    if (minor == 10 && patch == 0 && ptr[0] == '-' &&
+        internal_strstr(ptr, ".el7")) {
+      // Check RHEL7
+      int r1 = internal_simple_strtoll(ptr+1, &ptr, 10);
+      if (r1 >= 426) // 3.10.0-426.el7 or later
+        return true;
+      if (r1 == 327 && ptr[0] == '.') {
+        int r2 = internal_simple_strtoll(ptr+1, &ptr, 10);
+        if (r2 >= 27) // 3.10.0-327.27.1.el7 or later
+          return true;
+      }
+    }
     // Otherwise, bad.
     return false;
   } else if (major == 4) {