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Joshua Peraza c2467077b9 Enable truncation of module ranges 
ELF modules are loaded in memory in several, possibly discontiguous,
segments. If the holes between segments are large enough, other things,
possibly other ELF modules may be mapped in that space. Crashpad
records the range of modules as the base address of the lowest mapped
segment to the high address of the highest mapped segment. This means
that when one module is mapped into a hole in another, it appears to
the Breakpad processor as overlapping modules. Module ranges are
relevant to the Breakpad processor during stackwalking for identifying
which module a particular program counter belongs to (i.e. mapping the
address to a module's text segment). This patch addresses this issue of
overlapping modules by truncating the range of the module with the
lower base address. A typical module's text segment is the first loaded
segment which would leave the text segment range unaffected. Module
producers can restrict the size of holes in their ELF modules with the
flag "-Wl,-z,max-page-size=4096", preventing other modules from being
mapped in their address range.

Properly contemplating ELF module address ranges would require
extensions to the minidump format to encode any holes.
crbug.com/crashpad/298

This patch also renames the concept of "shrinking down" (which
truncated the upper of two overlapping ranges) to "truncate upper".

Change-Id: I4599201f1e43918db036c390961f8b39e3af1849
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/1646932
Reviewed-by: Mark Mentovai <mark@chromium.org>
2019-06-11 19:04:02 +00:00
.github support mistaken-pull-closer for automatically clearing incoming PRs 2018-12-07 01:49:55 +00:00
android sample_app: enable C++11 for Android builds 2016-04-04 21:35:26 -04:00
autotools Fix Travis build by running tests as root 2018-02-20 11:08:52 +00:00
docs Add optional field indicating multiple symbols at an address 2017-11-29 21:33:23 +00:00
m4 Only use O_CLOEXEC on platforms that support it 2017-05-10 21:32:37 +00:00
scripts Fix Travis build by running tests as root 2018-02-20 11:08:52 +00:00
src Enable truncation of module ranges 2019-06-11 19:04:02 +00:00
.gitignore drop glog from the checkout 2017-09-13 21:35:17 +00:00
.travis.yml Fix Travis build by running tests as root 2018-02-20 11:08:52 +00:00
aclocal.m4 Define and use a a new MDRawContextARM64 2018-08-01 19:27:25 +00:00
appveyor.yml Appveyor CI for Windows MSVS build 2017-02-13 17:57:15 +00:00
AUTHORS Make build system less annoying (#8) r=bryner 2006-08-30 20:05:05 +00:00
breakpad-client.pc.in make "make install" also install headers and pkgconfig files 2014-08-27 02:10:55 +00:00
breakpad.pc.in make "make install" also install headers and pkgconfig files 2014-08-27 02:10:55 +00:00
ChangeLog Initial import, which includes the Windows client-side dump_syms tool, and 2006-08-25 21:14:45 +00:00
codereview.settings Switch to Gerrit for code reviews 2016-07-27 20:07:49 +00:00
configure Add support for parsing the DW_AT_ranges attributes 2018-08-13 19:12:00 +00:00
configure.ac Fix Travis build by running tests as root 2018-02-20 11:08:52 +00:00
default.xml Roll DEPS for googletest to 5ec7f0c4. 2019-02-28 03:09:32 +00:00
DEPS Roll DEPS for googletest to 5ec7f0c4. 2019-02-28 03:09:32 +00:00
INSTALL autoreconf -f -i 2013-12-10 17:53:50 +00:00
LICENSE Renaming file COPYING to LICENSE and appending the disclaimer from src/common/convert_UTF.h to LICENSE. 2014-02-27 19:23:16 +00:00
Makefile.am Enable truncation of module ranges 2019-06-11 19:04:02 +00:00
Makefile.in Enable truncation of module ranges 2019-06-11 19:04:02 +00:00
NEWS Initial import, which includes the Windows client-side dump_syms tool, and 2006-08-25 21:14:45 +00:00
README.ANDROID Update symbol file documentation links. 2016-06-10 06:29:06 -04:00
README.md Appveyor CI for Windows MSVS build 2017-02-13 17:57:15 +00:00

README.md

Breakpad

Breakpad is a set of client and server components which implement a crash-reporting system.

Getting started (from master)

  1. First, download depot_tools and ensure that they’re in your PATH.

  2. Create a new directory for checking out the source code (it must be named breakpad).

    mkdir breakpad && cd breakpad

  3. Run the fetch tool from depot_tools to download all the source repos.

    fetch breakpad
cd src

  4. Build the source.

    ./configure && make

    You can also cd to another directory and run configure from there to build outside the source tree.

    This will build the processor tools (src/processor/minidump_stackwalk, src/processor/minidump_dump, etc), and when building on Linux it will also build the client libraries and some tools (src/tools/linux/dump_syms/dump_syms, src/tools/linux/md2core/minidump-2-core, etc).

  5. Optionally, run tests.

    make check

  6. Optionally, install the built libraries

    make install

If you need to reconfigure your build be sure to run make distclean first.

To update an existing checkout to a newer revision, you can git pull as usual, but then you should run gclient sync to ensure that the dependent repos are up-to-date.

To request change review

  1. Follow the steps above to get the source and build it.

  2. Make changes. Build and test your changes. For core code like processor use methods above. For linux/mac/windows, there are test targets in each project file.

  3. Commit your changes to your local repo and upload them to the server. http://dev.chromium.org/developers/contributing-code e.g. git commit ... && git cl upload ... You will be prompted for credential and a description.

  4. At https://chromium-review.googlesource.com/ you'll find your issue listed; click on it, then “Add reviewer”, and enter in the code reviewer. Depending on your settings, you may not see an email, but the reviewer has been notified with google-breakpad-dev@googlegroups.com always CC’d.