176874 2017-09-13 13:05:43 -0700 AddressSanitizer: stack-buffer-underflow in JSC::Probe::Page::Page 2017-09-14 16:09:31 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Local Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=146297 InRadar P2 Normal --- 175144 116980 1 hodovan mark.lam ap benjamin bfulgham buildbot cdumez cmarcelo dbates ddkilzer keith_miller mark.lam msaboff product-security saam webkit-bug-importer oldest_to_newest 1348452 0 320681 hodovan 2017-09-13 13:05:43 -0700 Created attachment 320681 Test Load the attached test with debug ASAN WebKitTestRunner: Checked version: 35511bd OS: macOS Sierra (10.12.6) <audio controls="false" onstalled="this.getElementsByTagName('input').prototype.getElementsByTagName('td')"></audio> Backtrace: ================================================================= ==11989==ERROR: AddressSanitizer: stack-buffer-underflow on address 0x7fff5da6ad00 at pc 0x0001021df9eb bp 0x7fff5da68ce0 sp 0x7fff5da684a0 READ of size 1024 at 0x7fff5da6ad00 thread T0 #0 0x1021df9ea in __asan_memcpy (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x419ea) #1 0x12ccae191 in JSC::Probe::Page::Page(void*) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2e77191) #2 0x12ccae1bc in JSC::Probe::Page::Page(void*) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2e771bc) #3 0x12ccaf3c8 in JSC::Probe::Stack::ensurePageFor(void*) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2e783c8) #4 0x12b4293c7 in JSC::Probe::Stack::pageFor(void*) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x15f23c7) #5 0x12b439e76 in void JSC::Probe::Stack::set<JSC::JSValue>(void*, JSC::JSValue) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1602e76) #6 0x12b439c94 in void JSC::Probe::Frame::set<JSC::JSValue>(long, JSC::JSValue) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x1602c94) #7 0x12b42352b in void JSC::Probe::Frame::setOperand<JSC::JSValue>(int, JSC::JSValue) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x15ec52b) #8 0x12b41f895 in JSC::DFG::OSRExit::executeOSRExit(JSC::Probe::Context&) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x15e8895) #9 0x12ccac026 in JSC::Probe::executeProbe(JSC::Probe::State*) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2e75026) #10 0x12c8558ea in ctiMasmProbeTrampoline (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x2a1e8ea) #11 0x62f00000e3ff (<unknown module>) Address 0x7fff5da6ad00 is located in stack of thread T0 at offset 0 in frame #0 0x12c1fa55f in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) (WebKit/WebKitBuild/Debug/JavaScriptCore.framework/Versions/A/JavaScriptCore+0x23c355f) This frame has 5 object(s): [32, 40) 'retval' <== Memory access at offset 0 partially underflows this variable [64, 112) 'scope' <== Memory access at offset 0 partially underflows this variable [144, 168) 'agg.tmp' <== Memory access at offset 0 partially underflows this variable [208, 216) 'coerce' <== Memory access at offset 0 partially underflows this variable [240, 248) 'result' <== Memory access at offset 0 partially underflows this variable HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext (longjmp and C++ exceptions *are* supported) SUMMARY: AddressSanitizer: stack-buffer-underflow (/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/8.0.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib+0x419ea) in __asan_memcpy Shadow bytes around the buggy address: 0x1fffebb4d550: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x1fffebb4d560: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x1fffebb4d570: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x1fffebb4d580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x1fffebb4d590: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 =>0x1fffebb4d5a0:[f1]f1 f1 f1 00 f2 f2 f2 00 00 00 00 00 00 f2 f2 0x1fffebb4d5b0: f2 f2 00 00 00 f2 f2 f2 f2 f2 00 f2 f2 f2 00 f3 0x1fffebb4d5c0: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 0x1fffebb4d5d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 0x1fffebb4d5e0: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 0x1fffebb4d5f0: 00 f2 f2 f2 00 f2 f2 f2 00 00 00 00 00 00 f2 f2 Shadow byte legend (one shadow byte represents 8 application bytes): Addressable: 00 Partially addressable: 01 02 03 04 05 06 07 Heap left redzone: fa Heap right redzone: fb Freed heap region: fd Stack left redzone: f1 Stack mid redzone: f2 Stack right redzone: f3 Stack partial redzone: f4 Stack after return: f5 Stack use after scope: f8 Global redzone: f9 Global init order: f6 Poisoned by user: f7 Container overflow: fc Array cookie: ac Intra object redzone: bb ASan internal: fe Left alloca redzone: ca Right alloca redzone: cb ==11989==ABORTING #CRASHED - com.apple.WebKit.WebContent.Development (pid 11989) LEAK: 1 WebProcessPool LEAK: 1 WebPageProxy 1348453 1 webkit-bug-importer 2017-09-13 13:08:29 -0700 <rdar://problem/34417206> 1348454 2 mark.lam 2017-09-13 13:17:14 -0700 This is a false positive by ASan. ASan does not like the Probe::Page code reading beyond the stackPointer. Page is only constructed in Stack::ensurePageFor(), and Stack::ensurePageFor() already does a RELEASE_ASSERT that the requested address is within the stack bounds. Since Page::size is 1K, and the stack is allocated in multiples of 1Ks (and is guaranteed to be 1K aligned in practice, this is not an issue at all. 1348580 3 320712 mark.lam 2017-09-13 17:17:12 -0700 Created attachment 320712 proposed patch. 1348583 4 320712 keith_miller 2017-09-13 17:22:53 -0700 Comment on attachment 320712 proposed patch. r=me. 1348586 5 320715 mark.lam 2017-09-13 17:27:32 -0700 Created attachment 320715 proposed patch. Saam pointed out that I also need to suppress ASan on Page::flushWrites() as well. 1348819 6 320715 ap 2017-09-14 10:09:32 -0700 Comment on attachment 320715 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=320715&action=review r-, as this doesn't fix ASanified builds. > Source/JavaScriptCore/ChangeLog:16 > + I've also added the SUPPRESS_ASAN attribute to tell ASan to ignore this > + constructor function. Unfortunately, Clang does not seem to honor that attribute > + (see <rdar://problem/34422508>). Regardless, this fix is correct and should be > + landed. The attribute only applies to the function it's on, and the violation occurs in a function called by it. It is expected behavior that SUPPRESS_ASAN doesn't help here, and we shouldn't be adding it. We've seen this before, the solution was to avoid using memcpy on poisoned memory (see for example copyMemory in MachineStackMarker.cpp). 1348822 7 mark.lam 2017-09-14 10:12:56 -0700 The DFG OSR Exit patch has been rolled out in r222009: <http://trac.webkit.org/r222009> due to https://bugs.webkit.org/show_bug.cgi?id=176888. I'll fix this when I re-land the DFG OSR patch. *** This bug has been marked as a duplicate of bug 175144 *** 1348842 8 mark.lam 2017-09-14 10:35:16 -0700 Actually, this is a Probe implementation issue, and not a DFG OSR exit issue. I'll fix it right away. 1348843 9 mark.lam 2017-09-14 10:39:43 -0700 <rdar://problem/34436415> 1349013 10 320822 mark.lam 2017-09-14 14:30:08 -0700 Created attachment 320822 proposed patch. 1349019 11 buildbot 2017-09-14 14:32:46 -0700 Attachment 320822 did not pass style-queue: ERROR: Source/JavaScriptCore/ChangeLog:40: Please consider whether the use of security-sensitive phrasing could help someone exploit WebKit: vulnerab [changelog/unwantedsecurityterms] [3] Total errors found: 1 in 7 files If any of these errors are false positives, please file a bug against check-webkit-style. 1349022 12 320822 saam 2017-09-14 14:46:55 -0700 Comment on attachment 320822 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=320822&action=review > Source/JavaScriptCore/assembler/ProbeStack.h:77 > + size_t numberOfChunks = sizeof(T) / s_chunkSize; I think you want to round up not down here, especially when s_chunkSize doesn't evenly divide sizeof(T). Also, you could just static_assert(sizeof(T) % s_chunkSize == 0) if you want > Source/JavaScriptCore/assembler/ProbeStack.h:122 > + static constexpr size_t s_pageSize = is64Bit() ? 512 : 256; // 64 * sizeof(uintptr_t) Why not just write 64 * sizeof(uintptr_t) here instead of the comment? > Source/JavaScriptCore/assembler/ProbeStack.h:132 > + static constexpr size_t s_chunkSizeShift = is64Bit() ? 3 : 2; maybe add: static_assert(1 << chunkSizeShift == sizeof(uintptr_t), "")? > Source/JavaScriptCore/assembler/testmasm.cpp:603 > + stack.set<double>(p++, 1.234567); why is this needed? > Source/JavaScriptCore/assembler/testmasm.cpp:634 > + CHECK_EQ(stack.get<double>(p++), 1.234567); ditto > Source/WTF/wtf/StdLibExtras.h:209 > + return reinterpret_cast<T*>(roundUpToMultipleOf<divisor>(reinterpret_cast<size_t>(x))); Please add: static_assert(sizeof(size_t) == sizeof(uintptr_t) or please use uintptr_t 1349024 13 320822 mark.lam 2017-09-14 14:51:30 -0700 Comment on attachment 320822 proposed patch. Will apply Saam's feedback. 1349039 14 320822 mark.lam 2017-09-14 15:20:26 -0700 Comment on attachment 320822 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=320822&action=review >> Source/JavaScriptCore/assembler/ProbeStack.h:77 >> + size_t numberOfChunks = sizeof(T) / s_chunkSize; > > I think you want to round up not down here, especially when s_chunkSize doesn't evenly divide sizeof(T). > Also, you could just static_assert(sizeof(T) % s_chunkSize == 0) if you want Fixed. I changed it to: roundUpToMultipleOf<sizeof(T)>(s_chunkSize) / s_chunkSize; >> Source/JavaScriptCore/assembler/ProbeStack.h:122 >> + static constexpr size_t s_pageSize = is64Bit() ? 512 : 256; // 64 * sizeof(uintptr_t) > > Why not just write 64 * sizeof(uintptr_t) here instead of the comment? Fixed. >> Source/JavaScriptCore/assembler/ProbeStack.h:132 >> + static constexpr size_t s_chunkSizeShift = is64Bit() ? 3 : 2; > > maybe add: > static_assert(1 << chunkSizeShift == sizeof(uintptr_t), "")? I already do "static_assert(s_chunkSize == (1 << s_chunkSizeShift), "bad chunkSizeShift");" below that covers this. >> Source/JavaScriptCore/assembler/testmasm.cpp:603 >> + stack.set<double>(p++, 1.234567); > > why is this needed? 32-bit x86 rounding. The verification on read back below fails because it reads 1.2345678 instead. >> Source/JavaScriptCore/assembler/testmasm.cpp:634 >> + CHECK_EQ(stack.get<double>(p++), 1.234567); > > ditto Answered above. >> Source/WTF/wtf/StdLibExtras.h:209 >> + return reinterpret_cast<T*>(roundUpToMultipleOf<divisor>(reinterpret_cast<size_t>(x))); > > Please add: > static_assert(sizeof(size_t) == sizeof(uintptr_t) > or > please use uintptr_t I think the 2 (size_t and uintptr_t) should be the same. I'm using size_t because the roundUpToMultipleOf() function it forwards to takes size_t. I'll add the static_assert anyway just to be paranoid. Actually, I'll assert that sizeof(T*) == sizeof(size_t), which is what we really need for this to be correct. 1349040 15 320832 mark.lam 2017-09-14 15:25:38 -0700 Created attachment 320832 patch for landing. 1349041 16 buildbot 2017-09-14 15:26:50 -0700 Attachment 320832 did not pass style-queue: ERROR: Source/JavaScriptCore/ChangeLog:40: Please consider whether the use of security-sensitive phrasing could help someone exploit WebKit: vulnerab [changelog/unwantedsecurityterms] [3] Total errors found: 1 in 7 files If any of these errors are false positives, please file a bug against check-webkit-style. 1349069 17 mark.lam 2017-09-14 16:09:31 -0700 Thanks for the review. Landed in r222058: <http://trac.webkit.org/r222058>. 320681 2017-09-13 13:05:43 -0700 2017-09-13 13:05:43 -0700 Test test.html text/html 117 hodovan PGF1ZGlvIGNvbnRyb2xzPSJmYWxzZSIgb25zdGFsbGVkPSJ0aGlzLmdldEVsZW1lbnRzQnlUYWdO YW1lKCdpbnB1dCcpLnByb3RvdHlwZS5nZXRFbGVtZW50c0J5VGFnTmFtZSgndGQnKSI+PC9hdWRp bz4K 320712 2017-09-13 17:17:12 -0700 2017-09-13 17:27:32 -0700 proposed patch. bug-176874.patch text/plain 2095 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjIyMDAyKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDI2IEBA CisyMDE3LTA5LTEzICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNvbT4KKworICAgICAgICBB ZGRyZXNzU2FuaXRpemVyOiBzdGFjay1idWZmZXItdW5kZXJmbG93IGluIEpTQzo6UHJvYmU6OlBh Z2U6OlBhZ2UuCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9p 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