This repository has been archived by the owner on May 21, 2019. It is now read-only.
builtins: Add __probestack support functions for x86 #4
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
|
||
| 1: | ||
| subl $0x1000, %ecx | ||
| orb $0, (%ecx) |
There was a problem hiding this comment.
I've heard in the past that just a plain store may be the most efficient thing to do here as the CPU doesn't have to load the memory and wait for the result to come back.
There was a problem hiding this comment.
I just used the same instruction as GCC and libgcc, but a read+write seems like an odd choice indeed.
|
I'm going to hold off on this for not to see what the resolution of rust-lang/llvm#21 is, but thanks for taking the initiative on this! |
alexcrichton
pushed a commit
that referenced
this pull request
Aug 30, 2015
Summary: On PPC64, half the msan tests fail with an infinite recursion through GetStackTrace like this: #0 __msan::GetStackTrace #1 __msan_memcpy #2 ?? () from /lib64/libgcc_s.so.1 #3 ?? () from /lib64/libgcc_s.so.1 #4 _Unwind_Backtrace #5 __sanitizer::BufferedStackTrace::SlowUnwindStack #6 __sanitizer::BufferedStackTrace::Unwind #7 __msan::GetStackTrace #8 __interceptor_calloc #9 _dl_allocate_tls #10 pthread_create@@GLIBC_2.17 #11 __interceptor_pthread_create #12 main The problem is that we call _Unwind_Backtrace to get a stack trace; but _Unwind_Backtrace calls memcpy, which we intercept and try to get another stack trace. This patch fixes it in __msan_memcpy by skipping the stack trace if IsInSymbolizer(). This works because GetStackTrace already creates a SymbolizerScope to "block reports from our interceptors during _Unwind_Backtrace". Reviewers: samsonov, wschmidt, eugenis Reviewed By: eugenis Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D10762 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@240878 91177308-0d34-0410-b5e6-96231b3b80d8
TimNN
pushed a commit
that referenced
this pull request
Apr 13, 2017
Enable more ignores when we start crashing.
Unwind in CHECK SIGSEGVs if happens early:
FATAL: ThreadSanitizer CHECK failed: ../projects/compiler-rt/lib/tsan/rtl/tsan_platform_posix.cc:105 "((beg)) <= ((end))" (0x8000000000, 0x4000000000)
Program received signal SIGSEGV, Segmentation fault.
__tsan::MetaMap::GetAndLock (this=0x1337c88 <__tsan::ctx_placeholder+8>, thr=thr@entry=0x7ffff7f91800, pc=pc@entry=4639488, addr=addr@entry=140737339086992, write_lock=write_lock@entry=true,
create=create@entry=true) at ../projects/compiler-rt/lib/tsan/rtl/tsan_sync.cc:208
208 u32 idx0 = *meta;
(gdb) bt
#0 __tsan::MetaMap::GetAndLock (this=0x1337c88 <__tsan::ctx_placeholder+8>, thr=thr@entry=0x7ffff7f91800, pc=pc@entry=4639488, addr=addr@entry=140737339086992, write_lock=write_lock@entry=true,
create=create@entry=true) at ../projects/compiler-rt/lib/tsan/rtl/tsan_sync.cc:208
#1 0x00000000004a965f in __tsan::MetaMap::GetOrCreateAndLock (this=<optimized out>, thr=thr@entry=0x7ffff7f91800, pc=pc@entry=4639488, addr=addr@entry=140737339086992, write_lock=write_lock@entry=true)
at ../projects/compiler-rt/lib/tsan/rtl/tsan_sync.cc:198
#2 0x00000000004a162a in __tsan::Release (thr=0x7ffff7f91800, pc=pc@entry=4639488, addr=addr@entry=140737339086992) at ../projects/compiler-rt/lib/tsan/rtl/tsan_rtl_mutex.cc:395
#3 0x000000000046cc40 in __interceptor_pthread_once (o=0x7ffff71a5890 <once_regsizes>, f=0x7ffff6f9d9c0 <init_dwarf_reg_size_table>) at ../projects/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc:1334
#4 0x00007ffff6f9fe86 in __gthread_once (__func=0x7ffff6f9d9c0 <init_dwarf_reg_size_table>, __once=0x7ffff71a5890 <once_regsizes>) at ./gthr-default.h:699
#5 uw_init_context_1 (context=context@entry=0x7fffffffd6d0, outer_cfa=outer_cfa@entry=0x7fffffffd980, outer_ra=0x437d13 <__sanitizer::BufferedStackTrace::SlowUnwindStack(unsigned long, unsigned int)+67>)
at ../../../src/libgcc/unwind-dw2.c:1572
#6 0x00007ffff6fa06a8 in _Unwind_Backtrace (trace=0x437c30 <__sanitizer::Unwind_Trace(_Unwind_Context*, void*)>, trace_argument=0x7fffffffd980) at ../../../src/libgcc/unwind.inc:283
#7 0x0000000000437d13 in __sanitizer::BufferedStackTrace::SlowUnwindStack (this=0x7ffff6103208, pc=pc@entry=4863574, max_depth=max_depth@entry=256)
at ../projects/compiler-rt/lib/sanitizer_common/sanitizer_unwind_linux_libcdep.cc:125
#8 0x0000000000434f4a in __sanitizer::BufferedStackTrace::Unwind (this=this@entry=0x7ffff6103208, max_depth=max_depth@entry=256, pc=pc@entry=4863574, bp=bp@entry=0, context=context@entry=0x0,
stack_top=stack_top@entry=0, stack_bottom=stack_bottom@entry=0, request_fast_unwind=request_fast_unwind@entry=false) at ../projects/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace_libcdep.cc:76
#9 0x00000000004a36b3 in PrintCurrentStackSlow (pc=4863574) at ../projects/compiler-rt/lib/tsan/rtl/tsan_rtl_report.cc:696
#10 __tsan::TsanCheckFailed (file=<optimized out>, line=<optimized out>, cond=<optimized out>, v1=<optimized out>, v2=<optimized out>) at ../projects/compiler-rt/lib/tsan/rtl/tsan_rtl_report.cc:44
#11 0x000000000042dfd6 in __sanitizer::CheckFailed (file=file@entry=0x4b9fd0 "../projects/compiler-rt/lib/tsan/rtl/tsan_platform_posix.cc", line=line@entry=105,
cond=cond@entry=0x4ba049 "((beg)) <= ((end))", v1=v1@entry=549755813888, v2=v2@entry=274877906944) at ../projects/compiler-rt/lib/sanitizer_common/sanitizer_termination.cc:79
#12 0x00000000004aa36c in ProtectRange (end=274877906944, beg=549755813888) at ../projects/compiler-rt/lib/tsan/rtl/tsan_platform_posix.cc:105
#13 __tsan::CheckAndProtect () at ../projects/compiler-rt/lib/tsan/rtl/tsan_platform_posix.cc:133
#14 0x00000000004a9e95 in __tsan::InitializePlatform () at ../projects/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cc:280
#15 0x0000000000497e73 in __tsan::Initialize (thr=0x7ffff7f91800) at ../projects/compiler-rt/lib/tsan/rtl/tsan_rtl.cc:343
#16 0x00007ffff7dea25a in _dl_init (main_map=0x7ffff7ffe1c8, argc=1, argv=0x7fffffffdb88, env=0x7fffffffdb98) at dl-init.c:111
#17 0x00007ffff7ddb30a in _dl_start_user () at rtld.c:871
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@281969 91177308-0d34-0410-b5e6-96231b3b80d8
TimNN
pushed a commit
that referenced
this pull request
Jul 20, 2017
Summary:
GET_CALLER_PC doesn't work properly on 31-bit s390, as pointers are 31-bit, the MSB bit can be set when the return address is copied into integer.
This causes e.g. errors like:
#0 0xfdadb129 (<unknown module>)
#1 0x7da5e1d1 in __asan::GetStackTraceWithPcBpAndContext(__sanitizer::BufferedStackTrace*, unsigned long, unsigned long, unsigned long, void*, bool) ../../../../../libsanitizer/asan/asan_stack.h:50
#2 0x7da5e1d1 in __asan::ErrorGeneric::Print() ../../../../../libsanitizer/asan/asan_errors.cc:482
#3 0x7db178d5 in __asan::ErrorDescription::Print() ../../../../../libsanitizer/asan/asan_errors.h:360
#4 0x7db178d5 in __asan::ScopedInErrorReport::~ScopedInErrorReport() ../../../../../libsanitizer/asan/asan_report.cc:167
#5 0x7db178d5 in __asan::ReportGenericError(unsigned long, unsigned long, unsigned long, unsigned long, bool, unsigned long, unsigned int, bool) ../../../../../libsanitizer/asan/asan_report.cc:397
#6 0x7dadb14f in __interceptor_memcmp ../../../../../libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:626
#7 0x400cf5 in main /home/jakub/gcc/gcc/testsuite/c-c++-common/asan/memcmp-1.c:14
#8 0x7d807215 in __libc_start_main (/lib/libc.so.6+0x1a215)
#9 0x4007ed (/home/jakub/gcc/obj/gcc/testsuite/memcmp-1.exe+0x4007ed)
The actual return PC inside __interceptor_memcmp was 0x7dadb129 rather than 0xfdadb129.
Reviewers: koriakin, kcc
Reviewed By: kcc
Subscribers: kubamracek
Differential Revision: https://reviews.llvm.org/D29824
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@294793 91177308-0d34-0410-b5e6-96231b3b80d8
alexcrichton
pushed a commit
that referenced
this pull request
Jan 25, 2018
Summary: __builtin_clz used for Log calculation returns an undefined result when argument is 0. I noticed that issue when was testing some fuzzers: ``` /src/libfuzzer/FuzzerTracePC.h:282:33: runtime error: shift exponent 450349 is too large for 32-bit type 'uint32_t' (aka 'unsigned int') #0 0x43d83f in operator() /src/libfuzzer/FuzzerTracePC.h:283:33 #1 0x43d83f in void fuzzer::TracePC::CollectFeatures<fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool*)::$_1>(fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool*)::$_1) const /src/libfuzzer/FuzzerTracePC.h:290 #2 0x43cbd4 in fuzzer::Fuzzer::RunOne(unsigned char const*, unsigned long, bool, fuzzer::InputInfo*, bool*) /src/libfuzzer/FuzzerLoop.cpp:445:7 #3 0x43e5f1 in fuzzer::Fuzzer::ReadAndExecuteSeedCorpora(std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, fuzzer::fuzzer_allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > const&) /src/libfuzzer/FuzzerLoop.cpp:706:5 #4 0x43e9e1 in fuzzer::Fuzzer::Loop(std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, fuzzer::fuzzer_allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > const&) /src/libfuzzer/FuzzerLoop.cpp:739:3 #5 0x432f8c in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/libfuzzer/FuzzerDriver.cpp:754:6 #6 0x42ee18 in main /src/libfuzzer/FuzzerMain.cpp:20:10 #7 0x7f17ffeb182f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f) #8 0x407838 in _start (/out/rotate_fuzzer+0x407838) Reviewers: kcc Reviewed By: kcc Subscribers: llvm-commits, #sanitizers Differential Revision: https://reviews.llvm.org/D41457 git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@321211 91177308-0d34-0410-b5e6-96231b3b80d8
alexcrichton
pushed a commit
to alexcrichton/compiler-rt
that referenced
this pull request
Jun 29, 2018
Summary:
Running sanitized 32-bit x86 programs on glibc 2.27 crashes at startup, with:
ERROR: AddressSanitizer: SEGV on unknown address 0xf7a8a250 (pc 0xf7f807f4 bp 0xff969fc8 sp 0xff969f7c T16777215)
The signal is caused by a WRITE memory access.
#0 0xf7f807f3 in _dl_get_tls_static_info (/lib/ld-linux.so.2+0x127f3)
rust-lang#1 0xf7a92599 (/lib/libasan.so.5+0x112599)
rust-lang#2 0xf7a80737 (/lib/libasan.so.5+0x100737)
rust-lang#3 0xf7f7e14f in _dl_init (/lib/ld-linux.so.2+0x1014f)
rust-lang#4 0xf7f6eb49 (/lib/ld-linux.so.2+0xb49)
The problem is that glibc changed the calling convention for the GLIBC_PRIVATE
symbol that sanitizer uses (even when it should not, GLIBC_PRIVATE is exactly
for symbols that can change at any time, be removed etc.), see
https://sourceware.org/ml/libc-alpha/2017-08/msg00497.html
Fixes google/sanitizers#954
Patch By: Jakub Jelinek
Reviewed By: vitalybuka, Lekensteyn
Differential Revison: https://reviews.llvm.org/D44623
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@334363 91177308-0d34-0410-b5e6-96231b3b80d8
Sign up for free
to subscribe to this conversation on GitHub.
Already have an account?
Sign in.
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Effort to fix rust-lang/rust#16012