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UFO: Predictive Detection of Concurrency Use-After-Free Vulnerabilities

License: MIT License

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april1989 leoaccount hecoz jgj212 wasabbi millylay cindyho1999 qspark-zz ivlzme dopelsunce lsabc menjacks guoyuqi020 limbicsys umangm polling-repo-continua xinguohua

ufo's Issues

Hi where can I find the confirmed UAFs.

Dear Andrew,

Do you know where I can find those confirmed/detected UAF reports as mentioned in the paper?

Thanks

Explaining use of offline analyzer

I'm trying ufo-predict, but got lost in how to use it correctly.

Suppose ufo-trace_20131 is the trace directory generated by the online tracking procedure when tested on test.cc. The output of java -jar ~/Downloads/runufo.jar is like:

21:19:55.776 [main] INFO aser.ufo.Main - app_name test; trace_dir /home/hongxu/concurrency/UFO/test/ufo-trace_20131.
21:19:55.779 [main] INFO aser.ufo.Main - solver_timeout 120
21:19:55.779 [main] INFO aser.ufo.Main - solver_mem 2000
21:19:55.779 [main] INFO aser.ufo.Main - window_size 100000
java.lang.NumberFormatException: For input string: "ffffffffff600000"
        at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
        at java.base/java.lang.Long.parseLong(Long.java:692)
        at aser.ufo.trace.EventLoader.loadCModuleInfo(EventLoader.java:156)
        at aser.ufo.trace.EventLoader.init(EventLoader.java:69)
        at aser.ufo.Session.init(Session.java:70)
        at aser.ufo.Main.main(Main.java:29)
21:19:55.806 [main] INFO aser.ufo.trace.EventLoader - tid: 0 Total Events:  67
21:19:55.806 [main] INFO aser.ufo.trace.EventLoader - tid: 1 Total Events:  22
Total loading time:  8ms
Total reachability analysis time:  2ms
Start Events: 1
Join Events: 1
Lock Events: 4
Unlock Events: 4
Wait/Notify Events: 2
Alloc Events: 7
DeAlloc Events: 9
Total Sync Events: 12
Total Alloc Events: 7
Total USE Events: 6
Total Free Events: 9
Total Read Events: 4
Total Write Events: 2
Total Events: 89
21:19:55.825 [main] INFO aser.ufo.Session - candidateUafLs: 1

------- #1 use call stack  
? pc: 0x4b6ad8
  /home/hongxu/LLVM/6.0.0/llvm/projects/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc:882 pc: 0x449e5e

------- #0 free call stack  
/home/hongxu/LLVM/6.0.0/llvm/projects/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc:624 pc: 0x44d0eb
  ? pc: 0x4b6bb9
    ? pc: 0x4b6ded

=================================

Session 1 | avg vals -1 | constr max 0  avg -1 | total constr 0 | total candidate UaF 0 
Solved UAF: {}

The result seems not expected since there supposed to be a UAF. To me, it seems that the solving procedure is not actually processed?

(There is a minor issue that there is a [vsyscall]|ffffffffff600000|ffffffffff601000| inside _module_info.txt which fails Long.parseLong.)

Another issue that confuses me is that TracePreprocessor has a main entry. May I know how to use this?

I ran it with <WRAPPER> /home/hongxu/concurrency/UFO/test/ufo-trace_20131 /home/hongxu/concurrency/UFO/test/out-ufo-trace, and it throws an exception:

Creating: "/home/hongxu/concurrency/UFO/test/out-ufo-trace": true
Start to uncompress 5 trace files from /home/hongxu/concurrency/UFO/test/ufo-trace_20131
java.io.IOException: [/home/hongxu/concurrency/UFO/test/ufo-trace_20131/1] Could not read enough data, requested: 1191182336  actual: 264
	at aser.ufo.TracePreprocessor.unzipBlocks(TracePreprocessor.java:160)
	at aser.ufo.TracePreprocessor$1.call(TracePreprocessor.java:77)
	at aser.ufo.TracePreprocessor$1.call(TracePreprocessor.java:74)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:844)
java.io.IOException: PARSING_ERROR(2)
	at org.xerial.snappy.SnappyNative.throw_error(SnappyNative.java:98)
	at org.xerial.snappy.SnappyNative.uncompressedLength(Native Method)
	at org.xerial.snappy.Snappy.uncompressedLength(Snappy.java:634)
	at aser.ufo.TracePreprocessor.unzipBlocks(TracePreprocessor.java:164)
	at aser.ufo.TracePreprocessor$1.call(TracePreprocessor.java:77)
	at aser.ufo.TracePreprocessor$1.call(TracePreprocessor.java:74)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:844)
Done: 883 (0.000842 MB) -> 46 (0.000044 MB). Rate: 1919.565217%

May I know what's going on?

Java Exception in Docker

I am trying to run UFO using docker but I keep getting exception when trying to run java -jar ufo-predict/runufo.jar

The error message is exception in "main":

Exception in thread "main" java.lang.NullPointerException
	at aser.ufo.misc.Addr2line.<init>(Addr2line.java:40)
	at aser.ufo.Session.init(Session.java:56)
	at aser.ufo.UFOMain.main(UFOMain.java:27)

I edited my config.properties to be

app_name=test
# trace directory to be analyzed
trace_dir=./ufo_traces
# solver timeout seconds
solver_time=120
#default symbolizer
symbolizer=atos
# solver_mem MB
solver_mem=2000
# window size
window_size=100000
# fast detect does not solve constraints to verify UAFs
fast_detect=false

and also tried changing the second line to trace_dir=./ufo_test_trace and trace_dir=./ufo_test_trace_22 to match the directory name of ufo_test_trace_22 in the ufo directory.

How to Use UFO to compile a project

Hi, I want to use UFO to test some open source softwares, but how can I compile them with UFO?
the usage example is only a single test file, could you please give some more examples ?

Chrome build error in Docker

Not sure if this is the right place to post but I could not find any information about the error anywhere.

I have followed the direction on building chromium on linux with custom clang and have successfully created .ninja files in src/out/Default.

However, every time I try to build chromium in docker using ninja, I keep getting these errors:

clang++: error: unknown argument: '-fcrash-diagnostics-dir=../../tools/clang/crashreports'
clang++: error: unknown argument: '-fcomplete-member-pointers'

I already configured my args.gn to point to the custom clang library; here is my args.gn:

clang_base_path = "/ufo/build"
clang_use_chrome_plugins = false
is_debug = false
enable_nacl=false
is_tsan=true
symbol_level = 1
is_component_build = true

For full error:

ninja: Entering directory `out/Default/'
[1/1] Regenerating ninja files
[2/63289] CC obj/base/third_party/libevent/libevent/strlcpy.o
FAILED: obj/base/third_party/libevent/libevent/strlcpy.o 
../../../../../ufo/build/bin/clang -MMD -MF obj/base/third_party/libevent/libevent/strlcpy.o.d -DHAVE_CONFIG_H -DUSE_UDEV -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_NSS_CERTS=1 -DUSE_X11=1 -DNO_TCMALLOC -DMEMORY_TOOL_REPLACES_ALLOCATOR -DMEMORY_SANITIZER_INITIAL_SIZE -DTHREAD_SANITIZER -DDYNAMIC_ANNOTATIONS_EXTERNAL_IMPL=1 -DWTF_USE_DYNAMIC_ANNOTATIONS_NOIMPL=1 -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DCHROMIUM_BUILD -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_GNU_SOURCE -DCOMPONENT_BUILD -D_LIBCPP_ABI_UNSTABLE -D_LIBCPP_ABI_VERSION=Cr -D_LIBCPP_ENABLE_NODISCARD -DCR_LIBCXX_REVISION=357024 -DCR_SYSROOT_HASH=e7c53f04bd88d29d075bfd1f62b073aeb69cbe09 -DNDEBUG -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DWTF_USE_DYNAMIC_ANNOTATIONS=1 -I../../base/third_party/libevent/linux -I../.. -Igen -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -funwind-tables -fPIC -B../../third_party/binutils/Linux_x64/Release/bin -pthread -fcolor-diagnostics -fmerge-all-constants -fcrash-diagnostics-dir=../../tools/clang/crashreports -Xclang -mllvm -Xclang -instcombine-lower-dbg-declare=0 -fcomplete-member-pointers -m64 -march=x86-64 -Wno-builtin-macro-redefined -D__DATE__= -D__TIME__= -D__TIMESTAMP__= -no-canonical-prefixes -O2 -fno-ident -fdata-sections -ffunction-sections -fno-omit-frame-pointer -g1 -gcolumn-info -fsanitize=thread -fsanitize-blacklist=../../tools/memory/tsan_v2/ignores.txt -fvisibility=hidden -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -Werror -Wall -Wno-unused-variable -Wno-missing-field-initializers -Wno-unused-parameter -Wno-c++11-narrowing -Wno-unneeded-internal-declaration -Wno-undefined-var-template -Wno-ignored-pragma-optimize -std=c11 --sysroot=../../build/linux/debian_sid_amd64-sysroot -c ../../base/third_party/libevent/strlcpy.c -o obj/base/third_party/libevent/libevent/strlcpy.o
clang: error: unknown argument: '-fcrash-diagnostics-dir=../../tools/clang/crashreports'
clang: error: unknown argument: '-fcomplete-member-pointers'
[3/63289] CXX obj/buildtools/third_party/libc++abi/libc++abi/stdlib_typeinfo.o
FAILED: obj/buildtools/third_party/libc++abi/libc++abi/stdlib_typeinfo.o 
../../../../../ufo/build/bin/clang++ -MMD -MF obj/buildtools/third_party/libc++abi/libc++abi/stdlib_typeinfo.o.d -DLIBCXXABI_SILENT_TERMINATE -D_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS -DUSE_UDEV -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_NSS_CERTS=1 -DUSE_X11=1 -DNO_TCMALLOC -DMEMORY_TOOL_REPLACES_ALLOCATOR -DMEMORY_SANITIZER_INITIAL_SIZE -DTHREAD_SANITIZER -DDYNAMIC_ANNOTATIONS_EXTERNAL_IMPL=1 -DWTF_USE_DYNAMIC_ANNOTATIONS_NOIMPL=1 -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DCHROMIUM_BUILD -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_GNU_SOURCE -DCOMPONENT_BUILD -D_LIBCPP_ABI_UNSTABLE -D_LIBCPP_ABI_VERSION=Cr -D_LIBCPP_ENABLE_NODISCARD -DCR_LIBCXX_REVISION=357024 -DCR_SYSROOT_HASH=e7c53f04bd88d29d075bfd1f62b073aeb69cbe09 -DNDEBUG -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DWTF_USE_DYNAMIC_ANNOTATIONS=1 -I../.. -Igen -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -funwind-tables -fPIC -B../../third_party/binutils/Linux_x64/Release/bin -pthread -fcolor-diagnostics -fmerge-all-constants -fcrash-diagnostics-dir=../../tools/clang/crashreports -Xclang -mllvm -Xclang -instcombine-lower-dbg-declare=0 -fcomplete-member-pointers -m64 -march=x86-64 -Wno-builtin-macro-redefined -D__DATE__= -D__TIME__= -D__TIMESTAMP__= -no-canonical-prefixes -O2 -fno-ident -fdata-sections -ffunction-sections -fno-omit-frame-pointer -g1 -gcolumn-info -fsanitize=thread -fsanitize-blacklist=../../tools/memory/tsan_v2/ignores.txt -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -Werror -Wall -Wno-unused-variable -Wno-missing-field-initializers -Wno-unused-parameter -Wno-c++11-narrowing -Wno-unneeded-internal-declaration -Wno-undefined-var-template -Wno-ignored-pragma-optimize -fstrict-aliasing -fPIC -fvisibility=default -std=c++14 -nostdinc++ -isystem../../buildtools/third_party/libc++/trunk/include -isystem../../buildtools/third_party/libc++abi/trunk/include --sysroot=../../build/linux/debian_sid_amd64-sysroot -fexceptions -frtti -c ../../buildtools/third_party/libc++abi/trunk/src/stdlib_typeinfo.cpp -o obj/buildtools/third_party/libc++abi/libc++abi/stdlib_typeinfo.o
clang++: error: unknown argument: '-fcrash-diagnostics-dir=../../tools/clang/crashreports'
clang++: error: unknown argument: '-fcomplete-member-pointers'
[4/63289] CXX obj/buildtools/third_party/libc++/libc++/algorithm.o
FAILED: obj/buildtools/third_party/libc++/libc++/algorithm.o 
../../../../../ufo/build/bin/clang++ -MMD -MF obj/buildtools/third_party/libc++/libc++/algorithm.o.d -D_LIBCPP_BUILDING_LIBRARY -D_LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS -DLIBCXX_BUILDING_LIBCXXABI -DUSE_UDEV -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_NSS_CERTS=1 -DUSE_X11=1 -DNO_TCMALLOC -DMEMORY_TOOL_REPLACES_ALLOCATOR -DMEMORY_SANITIZER_INITIAL_SIZE -DTHREAD_SANITIZER -DDYNAMIC_ANNOTATIONS_EXTERNAL_IMPL=1 -DWTF_USE_DYNAMIC_ANNOTATIONS_NOIMPL=1 -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DCHROMIUM_BUILD -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_GNU_SOURCE -DCOMPONENT_BUILD -D_LIBCPP_ABI_UNSTABLE -D_LIBCPP_ABI_VERSION=Cr -D_LIBCPP_ENABLE_NODISCARD -DCR_LIBCXX_REVISION=357024 -DCR_SYSROOT_HASH=e7c53f04bd88d29d075bfd1f62b073aeb69cbe09 -DNDEBUG -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DWTF_USE_DYNAMIC_ANNOTATIONS=1 -I../.. -Igen -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -funwind-tables -fPIC -B../../third_party/binutils/Linux_x64/Release/bin -pthread -fcolor-diagnostics -fmerge-all-constants -fcrash-diagnostics-dir=../../tools/clang/crashreports -Xclang -mllvm -Xclang -instcombine-lower-dbg-declare=0 -fcomplete-member-pointers -m64 -march=x86-64 -Wno-builtin-macro-redefined -D__DATE__= -D__TIME__= -D__TIMESTAMP__= -no-canonical-prefixes -O2 -fno-ident -fdata-sections -ffunction-sections -fno-omit-frame-pointer -g1 -gcolumn-info -fsanitize=thread -fsanitize-blacklist=../../tools/memory/tsan_v2/ignores.txt -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -fstrict-aliasing -fPIC -Werror -Wall -Wno-unused-variable -Wno-missing-field-initializers -Wno-unused-parameter -Wno-c++11-narrowing -Wno-unneeded-internal-declaration -Wno-undefined-var-template -Wno-ignored-pragma-optimize -fvisibility=default -std=c++14 -nostdinc++ -isystem../../buildtools/third_party/libc++/trunk/include -isystem../../buildtools/third_party/libc++abi/trunk/include --sysroot=../../build/linux/debian_sid_amd64-sysroot -fexceptions -frtti -c ../../buildtools/third_party/libc++/trunk/src/algorithm.cpp -o obj/buildtools/third_party/libc++/libc++/algorithm.o
clang++: error: unknown argument: '-fcrash-diagnostics-dir=../../tools/clang/crashreports'
clang++: error: unknown argument: '-fcomplete-member-pointers'
[5/63289] CXX obj/buildtools/third_party/libc++abi/libc++abi/cxa_exception_storage.o
FAILED: obj/buildtools/third_party/libc++abi/libc++abi/cxa_exception_storage.o 
../../../../../ufo/build/bin/clang++ -MMD -MF obj/buildtools/third_party/libc++abi/libc++abi/cxa_exception_storage.o.d -DLIBCXXABI_SILENT_TERMINATE -D_LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS -DUSE_UDEV -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_NSS_CERTS=1 -DUSE_X11=1 -DNO_TCMALLOC -DMEMORY_TOOL_REPLACES_ALLOCATOR -DMEMORY_SANITIZER_INITIAL_SIZE -DTHREAD_SANITIZER -DDYNAMIC_ANNOTATIONS_EXTERNAL_IMPL=1 -DWTF_USE_DYNAMIC_ANNOTATIONS_NOIMPL=1 -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DCHROMIUM_BUILD -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_GNU_SOURCE -DCOMPONENT_BUILD -D_LIBCPP_ABI_UNSTABLE -D_LIBCPP_ABI_VERSION=Cr -D_LIBCPP_ENABLE_NODISCARD -DCR_LIBCXX_REVISION=357024 -DCR_SYSROOT_HASH=e7c53f04bd88d29d075bfd1f62b073aeb69cbe09 -DNDEBUG -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DWTF_USE_DYNAMIC_ANNOTATIONS=1 -I../.. -Igen -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -funwind-tables -fPIC -B../../third_party/binutils/Linux_x64/Release/bin -pthread -fcolor-diagnostics -fmerge-all-constants -fcrash-diagnostics-dir=../../tools/clang/crashreports -Xclang -mllvm -Xclang -instcombine-lower-dbg-declare=0 -fcomplete-member-pointers -m64 -march=x86-64 -Wno-builtin-macro-redefined -D__DATE__= -D__TIME__= -D__TIMESTAMP__= -no-canonical-prefixes -O2 -fno-ident -fdata-sections -ffunction-sections -fno-omit-frame-pointer -g1 -gcolumn-info -fsanitize=thread -fsanitize-blacklist=../../tools/memory/tsan_v2/ignores.txt -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -Werror -Wall -Wno-unused-variable -Wno-missing-field-initializers -Wno-unused-parameter -Wno-c++11-narrowing -Wno-unneeded-internal-declaration -Wno-undefined-var-template -Wno-ignored-pragma-optimize -fstrict-aliasing -fPIC -fvisibility=default -std=c++14 -nostdinc++ -isystem../../buildtools/third_party/libc++/trunk/include -isystem../../buildtools/third_party/libc++abi/trunk/include --sysroot=../../build/linux/debian_sid_amd64-sysroot -fexceptions -frtti -c ../../buildtools/third_party/libc++abi/trunk/src/cxa_exception_storage.cpp -o obj/buildtools/third_party/libc++abi/libc++abi/cxa_exception_storage.o
clang++: error: unknown argument: '-fcrash-diagnostics-dir=../../tools/clang/crashreports'
clang++: error: unknown argument: '-fcomplete-member-pointers'
[6/63289] CXX obj/base/test/test_child_process/test_child_process.o
FAILED: obj/base/test/test_child_process/test_child_process.o 
../../../../../ufo/build/bin/clang++ -MMD -MF obj/base/test/test_child_process/test_child_process.o.d -DUSE_UDEV -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_NSS_CERTS=1 -DUSE_X11=1 -DNO_TCMALLOC -DMEMORY_TOOL_REPLACES_ALLOCATOR -DMEMORY_SANITIZER_INITIAL_SIZE -DTHREAD_SANITIZER -DDYNAMIC_ANNOTATIONS_EXTERNAL_IMPL=1 -DWTF_USE_DYNAMIC_ANNOTATIONS_NOIMPL=1 -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DCHROMIUM_BUILD -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -DCOMPONENT_BUILD -D_LIBCPP_ABI_UNSTABLE -D_LIBCPP_ABI_VERSION=Cr -D_LIBCPP_ENABLE_NODISCARD -DCR_LIBCXX_REVISION=357024 -DCR_SYSROOT_HASH=e7c53f04bd88d29d075bfd1f62b073aeb69cbe09 -DNDEBUG -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DWTF_USE_DYNAMIC_ANNOTATIONS=1 -I../.. -Igen -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -funwind-tables -fPIC -B../../third_party/binutils/Linux_x64/Release/bin -pthread -fcolor-diagnostics -fmerge-all-constants -fcrash-diagnostics-dir=../../tools/clang/crashreports -Xclang -mllvm -Xclang -instcombine-lower-dbg-declare=0 -fcomplete-member-pointers -m64 -march=x86-64 -Wno-builtin-macro-redefined -D__DATE__= -D__TIME__= -D__TIMESTAMP__= -no-canonical-prefixes -Wall -Werror -Wextra -Wimplicit-fallthrough -Wthread-safety -Wextra-semi -Wno-missing-field-initializers -Wno-unused-parameter -Wno-c++11-narrowing -Wno-unneeded-internal-declaration -Wno-undefined-var-template -Wno-ignored-pragma-optimize -O2 -fno-ident -fdata-sections -ffunction-sections -fno-omit-frame-pointer -g1 -gcolumn-info -fsanitize=thread -fsanitize-blacklist=../../tools/memory/tsan_v2/ignores.txt -fvisibility=hidden -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -std=c++14 -fno-exceptions -fno-rtti -nostdinc++ -isystem../../buildtools/third_party/libc++/trunk/include -isystem../../buildtools/third_party/libc++abi/trunk/include --sysroot=../../build/linux/debian_sid_amd64-sysroot -fvisibility-inlines-hidden -c ../../base/test/test_child_process.cc -o obj/base/test/test_child_process/test_child_process.o
clang++: error: unknown argument: '-fcrash-diagnostics-dir=../../tools/clang/crashreports'
clang++: error: unknown argument: '-fcomplete-member-pointers'
[7/63289] CXX obj/buildtools/third_party/libc++/libc++/chrono.o
FAILED: obj/buildtools/third_party/libc++/libc++/chrono.o 
../../../../../ufo/build/bin/clang++ -MMD -MF obj/buildtools/third_party/libc++/libc++/chrono.o.d -D_LIBCPP_BUILDING_LIBRARY -D_LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS -DLIBCXX_BUILDING_LIBCXXABI -DUSE_UDEV -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_NSS_CERTS=1 -DUSE_X11=1 -DNO_TCMALLOC -DMEMORY_TOOL_REPLACES_ALLOCATOR -DMEMORY_SANITIZER_INITIAL_SIZE -DTHREAD_SANITIZER -DDYNAMIC_ANNOTATIONS_EXTERNAL_IMPL=1 -DWTF_USE_DYNAMIC_ANNOTATIONS_NOIMPL=1 -DFULL_SAFE_BROWSING -DSAFE_BROWSING_CSD -DSAFE_BROWSING_DB_LOCAL -DCHROMIUM_BUILD -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_GNU_SOURCE -DCOMPONENT_BUILD -D_LIBCPP_ABI_UNSTABLE -D_LIBCPP_ABI_VERSION=Cr -D_LIBCPP_ENABLE_NODISCARD -DCR_LIBCXX_REVISION=357024 -DCR_SYSROOT_HASH=e7c53f04bd88d29d075bfd1f62b073aeb69cbe09 -DNDEBUG -DDYNAMIC_ANNOTATIONS_ENABLED=1 -DWTF_USE_DYNAMIC_ANNOTATIONS=1 -I../.. -Igen -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -funwind-tables -fPIC -B../../third_party/binutils/Linux_x64/Release/bin -pthread -fcolor-diagnostics -fmerge-all-constants -fcrash-diagnostics-dir=../../tools/clang/crashreports -Xclang -mllvm -Xclang -instcombine-lower-dbg-declare=0 -fcomplete-member-pointers -m64 -march=x86-64 -Wno-builtin-macro-redefined -D__DATE__= -D__TIME__= -D__TIMESTAMP__= -no-canonical-prefixes -O2 -fno-ident -fdata-sections -ffunction-sections -fno-omit-frame-pointer -g1 -gcolumn-info -fsanitize=thread -fsanitize-blacklist=../../tools/memory/tsan_v2/ignores.txt -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -fstrict-aliasing -fPIC -Werror -Wall -Wno-unused-variable -Wno-missing-field-initializers -Wno-unused-parameter -Wno-c++11-narrowing -Wno-unneeded-internal-declaration -Wno-undefined-var-template -Wno-ignored-pragma-optimize -fvisibility=default -std=c++14 -nostdinc++ -isystem../../buildtools/third_party/libc++/trunk/include -isystem../../buildtools/third_party/libc++abi/trunk/include --sysroot=../../build/linux/debian_sid_amd64-sysroot -fexceptions -frtti -c ../../buildtools/third_party/libc++/trunk/src/chrono.cpp -o obj/buildtools/third_party/libc++/libc++/chrono.o
clang++: error: unknown argument: '-fcrash-diagnostics-dir=../../tools/clang/crashreports'
clang++: error: unknown argument: '-fcomplete-member-pointers'
ninja: build stopped: subcommand failed.

Also, my head out/Default/toolchain.ninja returns

rule cc
  command =  ../../../../../ufo/build/bin/clang -MMD -MF ${out}.d ${defines} ${include_dirs} ${cflags} ${cflags_c} -c ${in} -o ${out}
  description = CC ${out}
  depfile = ${out}.d
  deps = gcc
rule cxx
  command =  ../../../../../ufo/build/bin/clang++ -MMD -MF ${out}.d ${defines} ${include_dirs} ${cflags} ${cflags_cc} -c ${in} -o ${out}
  description = CXX ${out}
  depfile = ${out}.d
  deps = gcc

which seems like it is using the correct clang and clang++

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