[PATCH] D18915: [sanitizer] [SystemZ] Abort if the kernel might be vulnerable to CVE-2016-2143.

[Marcin Kościelnicki via llvm-commits]

koriakin created this revision.
koriakin added reviewers: uweigand, eugenis, rsmith, samsonov.
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In short, CVE-2016-2143 will crash the machine if a process uses both >4TB
virtual addresses and fork().  ASan, TSan, and MSan will, by necessity, map
a sizable chunk of virtual address space, which is much larger than 4TB.
Even worse, sanitizers will always use fork() for llvm-symbolizer when a bug
is detected.  Disable all three by aborting on process initialization if
the running kernel version is not known to contain a fix.

Unfortunately, there's no reliable way to detect the fix without crashing
the kernel.  So, we rely on whitelisting - I've included a list of upstream
kernel versions that will work.  In case someone uses a distribution kernel
or applied the fix themselves, an override switch is also included.


Repository:
  rL LLVM

http://reviews.llvm.org/D18915

Files:
  lib/asan/asan_rtl.cc
  lib/msan/msan.cc
  lib/sanitizer_common/sanitizer_linux.cc
  lib/sanitizer_common/sanitizer_linux.h
  lib/tsan/rtl/tsan_platform_linux.cc

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