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[GWP-ASan] [Scudo] Add GWP-ASan backtrace for alloc/free to Scudo. 

Summary:
Adds allocation and deallocation stack trace support to Scudo. The
default provided backtrace library for GWP-ASan is supplied by the libc
unwinder, and is suitable for production variants of Scudo. If Scudo in future
has its own unwinder, it may choose to use its own over the generic unwinder
instead.

Reviewers: cryptoad

Reviewed By: cryptoad

Subscribers: kubamracek, mgorny, #sanitizers, llvm-commits, morehouse, vlad.tsyrklevich, eugenis

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D64085

llvm-svn: 364966
This commit is contained in:
Mitch Phillips 2019-07-02 20:33:19 +00:00
parent f2055c5eb8
commit d4acc4720e
2 changed files with 11 additions and 2 deletions
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7
compiler-rt/lib/scudo/CMakeLists.txt
View File

@ -12,6 +12,10 @@ append_list_if(COMPILER_RT_HAS_LIBDL dl SCUDO_MINIMAL_DYNAMIC_LIBS)
append_list_if(COMPILER_RT_HAS_LIBRT rt SCUDO_MINIMAL_DYNAMIC_LIBS)
append_list_if(COMPILER_RT_HAS_LIBPTHREAD pthread SCUDO_MINIMAL_DYNAMIC_LIBS)
append_list_if(COMPILER_RT_HAS_LIBLOG log SCUDO_MINIMAL_DYNAMIC_LIBS)
append_list_if(COMPILER_RT_HAS_OMIT_FRAME_POINTER_FLAG -fno-omit-frame-pointer
SCUDO_CFLAGS)
append_list_if(COMPILER_RT_HAS_OMIT_FRAME_POINTER_FLAG
-mno-omit-leaf-frame-pointer SCUDO_CFLAGS)
set(SCUDO_DYNAMIC_LINK_FLAGS ${SANITIZER_COMMON_LINK_FLAGS})
# Use gc-sections by default to avoid unused code being pulled in.
@ -35,7 +39,8 @@ if (COMPILER_RT_HAS_GWP_ASAN)
# Currently, Scudo uses the GwpAsan flag parser. This backs onto the flag
# parsing mechanism of sanitizer_common. Once Scudo has its own flag parsing,
# and parses GwpAsan options, you can remove this dependency.
list(APPEND SCUDO_MINIMAL_OBJECT_LIBS RTGwpAsan RTGwpAsanOptionsParser)
list(APPEND SCUDO_MINIMAL_OBJECT_LIBS RTGwpAsan RTGwpAsanOptionsParser
RTGwpAsanBacktraceLibc)
list(APPEND SCUDO_CFLAGS -DGWP_ASAN_HOOKS)
endif()

6
compiler-rt/lib/scudo/scudo_allocator.cpp
View File

@ -27,6 +27,7 @@
#ifdef GWP_ASAN_HOOKS
# include "gwp_asan/guarded_pool_allocator.h"
# include "gwp_asan/optional/backtrace.h"
# include "gwp_asan/optional/options_parser.h"
#endif // GWP_ASAN_HOOKS
@ -671,7 +672,10 @@ void initScudo() {
Instance.init();
#ifdef GWP_ASAN_HOOKS
gwp_asan::options::initOptions();
GuardedAlloc.init(gwp_asan::options::getOptions());
gwp_asan::options::Options &Opts = gwp_asan::options::getOptions();
Opts.Backtrace = gwp_asan::options::getBacktraceFunction();
Opts.PrintBacktrace = gwp_asan::options::getPrintBacktraceFunction();
GuardedAlloc.init(Opts);
#endif // GWP_ASAN_HOOKS
}