diff options
author | Marcin Koscielnicki <koriakin@0x04.net> | 2016-04-14 12:56:24 +0000 |
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committer | Marcin Koscielnicki <koriakin@0x04.net> | 2016-04-14 12:56:24 +0000 |
commit | 0f9d2c5fef1ad3d92f6153570477ada540056b58 (patch) | |
tree | c63ab20dc1615c1cc8647198e5b30d3316f0c25a /lib/msan/msan.cc | |
parent | 5cfe468b044eba18d668cc7ace45932f558a6d77 (diff) |
[sanitizer] [SystemZ] Abort if the kernel might be vulnerable to CVE-2016-2143.
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.
Differential Revision: http://reviews.llvm.org/D18915
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@266297 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/msan/msan.cc')
-rw-r--r-- | lib/msan/msan.cc | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/msan/msan.cc b/lib/msan/msan.cc index cecbfe06a..c65e999a1 100644 --- a/lib/msan/msan.cc +++ b/lib/msan/msan.cc @@ -22,6 +22,10 @@ #include "sanitizer_common/sanitizer_flags.h" #include "sanitizer_common/sanitizer_flag_parser.h" #include "sanitizer_common/sanitizer_libc.h" +#if defined(__s390x__) && defined(__linux__) +// For AvoidCVE_2016_2143. +#include "sanitizer_common/sanitizer_linux.h" +#endif #include "sanitizer_common/sanitizer_procmaps.h" #include "sanitizer_common/sanitizer_stacktrace.h" #include "sanitizer_common/sanitizer_symbolizer.h" @@ -375,6 +379,9 @@ void __msan_init() { msan_init_is_running = 1; SanitizerToolName = "MemorySanitizer"; +#if defined(__s390x__) && defined(__linux__) + AvoidCVE_2016_2143(); +#endif InitTlsSize(); CacheBinaryName(); |