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authorivan.penkov@gmail.com <ivan.penkov@gmail.com@4c0a9323-5329-0410-9bdc-e9ce6186880e>2013-06-27 20:34:30 +0000
committerivan.penkov@gmail.com <ivan.penkov@gmail.com@4c0a9323-5329-0410-9bdc-e9ce6186880e>2013-06-27 20:34:30 +0000
commitd394434a93a7dda8b6f1701327a2887d4892e3e6 (patch)
tree1b4e25cab21fb32087c58ffabe7b64ff399364dc /src/common/mac/string_utilities.cc
parentMore robust stack walks when the IP address in the context frame is invalid (... (diff)
downloadbreakpad-d394434a93a7dda8b6f1701327a2887d4892e3e6.tar.xz
This change is addressing a particularly nasty issue where the stackwalker
doesn't see the correct thread stack memory. Instead, it loads garbage (from offset 0 of the minidump file - well that's not garbage, but it is not the stack memory region either) and attempts to walk it. A typical symptom of this issue is when you get a single stack frame after processing - the context frame - for which you don't need stack memory. This issue is caused by an invalid RVA in the memory descriptor stored inside the MINIDUMP_THREAD structure for the thread. Luckily, the invalid RVA is 0, and the start_of_memory_region appears to be correct, so this issue can be easily detected and the correct memory region can be loaded using an RVA specified in the MinidumpMemoryList. I couldn't find a reasonable description on MSDN regarding MINIDUMP_MEMORY_DESCRIPTOR.MINIDUMP_LOCATION_DESCRIPTOR having RVA of 0 except maybe for full dumps where the 64-bit version of the structure (MINIDUMP_MEMORY_DESCRIPTOR64) is used and it has no RVA at all. It has a 64-bit DataSize which if interpreted as the 32-bit structure will very likely result in 0 for the RVA: http://msdn.microsoft.com/en-us/library/windows/desktop/ms680384(v=vs.85).aspx Anyways, the dump that I looked at was not a full dump so 0 for RVA is a bit puzzling (at least easily detectable): ... Microsoft (R) Windows Debugger Version 6.2.9200.20512 X86 Copyright (c) Microsoft Corporation. All rights reserved. ... User Mini Dump File: Only registers, stack and portions of memory are available ... MINIDUMP_HEADER: Version A793 (62F0) NumberOfStreams 11 Flags 160 0020 MiniDumpWithUnloadedModules 0040 MiniDumpWithIndirectlyReferencedMemory 0100 MiniDumpWithProcessThreadData Review URL: https://breakpad.appspot.com/606002 git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1194 4c0a9323-5329-0410-9bdc-e9ce6186880e
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