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bpo-35214: Initial clang MemorySanitizer support (GH-10479)

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Adds configure flags for msan and ubsan builds to make it easier to enable.
These also encode the detail that address sanitizer and memory sanitizer
should disable pymalloc.

Define MEMORY_SANITIZER when appropriate at build time and adds workarounds
to existing code to mark things as initialized where the sanitizer is otherwise unable to
determine that.  This lets our build succeed under the memory sanitizer.  not all tests
pass without sanitizer failures yet but we're in pretty good shape after this.
This commit is contained in:
Gregory P. Smith 2018-11-12 12:07:14 -08:00 • committed by GitHub
parent a9655b7f71
commit 1584a00815
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9 changed files with 115 additions and 4 deletions
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28
configure.ac
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@ -2854,11 +2854,37 @@ esac
AC_MSG_CHECKING(for --with-address-sanitizer)
AC_ARG_WITH(address_sanitizer,
AS_HELP_STRING([--with-address-sanitizer],
[enable AddressSanitizer]),
[enable AddressSanitizer (asan)]),
[
AC_MSG_RESULT($withval)
BASECFLAGS="-fsanitize=address -fno-omit-frame-pointer $BASECFLAGS"
LDFLAGS="-fsanitize=address $LDFLAGS"
# ASan works by controlling memory allocation, our own malloc interferes.
with_pymalloc="no"
],
[AC_MSG_RESULT(no)])
AC_MSG_CHECKING(for --with-memory-sanitizer)
AC_ARG_WITH(memory_sanitizer,
AS_HELP_STRING([--with-memory-sanitizer],
[enable MemorySanitizer (msan)]),
[
AC_MSG_RESULT($withval)
BASECFLAGS="-fsanitize=memory -fsanitize-memory-track-origins=2 -fno-omit-frame-pointer $BASECFLAGS"
LDFLAGS="-fsanitize=memory -fsanitize-memory-track-origins=2 $LDFLAGS"
# MSan works by controlling memory allocation, our own malloc interferes.
with_pymalloc="no"
],
[AC_MSG_RESULT(no)])
AC_MSG_CHECKING(for --with-undefined-behavior-sanitizer)
AC_ARG_WITH(undefined_behavior_sanitizer,
AS_HELP_STRING([--with-undefined-behavior-sanitizer],
[enable UndefinedBehaviorSanitizer (ubsan)]),
[
AC_MSG_RESULT($withval)
BASECFLAGS="-fsanitize=undefined $BASECFLAGS"
LDFLAGS="-fsanitize=undefined $LDFLAGS"
],
[AC_MSG_RESULT(no)])