Dear all, This series aims to provide an entrypoint for, and fuzz KVM's x86 instruction emulator from userspace. It mirrors Xen's application of the AFL fuzzer to it's instruction emulator in the hopes of discovering vulnerabilities. Since this entrypoint also allows arbitrary execution of the emulators code from userspace, it may also be useful for testing. The current 4 patches build the emulator and 2 harnesses: simple-harness is an example of unit testing; afl-harness is a frontend for the AFL fuzzer. The fifth patch contains useful scripts for development but is not intended for usptream consumption. Patches ======= - 01: Builds and links afl-harness with the required kernel objects. - 02: Introduces the minimal set of emulator operations and supporting code to emulate simple instructions. - 03: Demonstrates simple-harness as a unit test. - 04: Adds scripts for install and building. - 05: Useful scripts for development Changelog ======= v1 -> v2: - Moved -O0 to ifdef DEBUG - Building with ASAN by default - Removed a number of macros from emulator_ops.c and moved them as static inline functions in emulator_ops.h - Accidentally changed the example in simple-harness (reverted in v3) - Introduced patch 4 for scripts v2 -> v3: - Removed a workaround for printf smashing the stack when compiled with -mcmodel=kernel, and stopped compiling with -mcmodel=kernel - Added a null check for malloc's return value - Moved more macros from emulator_ops.c into emulator_ops.h as static inline functions - Removed commented out code - Moved changes to emulator_ops.h into the first patch - Moved addition of afl-many script to the script patch - Fixed spelling mistakes in documentation - Reverted the simple-harness example back to the more useful original one - Moved non-essential development scripts from patch 4 new patch 5 Any comments/suggestions are greatly appreciated. Best, Sam Caccavale Sam Caccavale (5): Build target for emulate.o as a userspace binary Emulate simple x86 instructions in userspace Demonstrating unit testing via simple-harness Added build and install scripts Development scripts for crash triage and deploy tools/Makefile | 9 + tools/fuzz/x86ie/.gitignore | 2 + tools/fuzz/x86ie/Makefile | 54 +++ tools/fuzz/x86ie/README.md | 17 + tools/fuzz/x86ie/afl-harness.c | 151 +++++++ tools/fuzz/x86ie/common.h | 87 ++++ tools/fuzz/x86ie/emulator_ops.c | 381 ++++++++++++++++++ tools/fuzz/x86ie/emulator_ops.h | 120 ++++++ tools/fuzz/x86ie/scripts/afl-many | 31 ++ tools/fuzz/x86ie/scripts/bin.sh | 49 +++ tools/fuzz/x86ie/scripts/build.sh | 33 ++ tools/fuzz/x86ie/scripts/coalesce.sh | 5 + tools/fuzz/x86ie/scripts/deploy.sh | 9 + tools/fuzz/x86ie/scripts/deploy_remote.sh | 9 + tools/fuzz/x86ie/scripts/gen_output.sh | 11 + tools/fuzz/x86ie/scripts/install_afl.sh | 17 + .../fuzz/x86ie/scripts/install_deps_ubuntu.sh | 5 + tools/fuzz/x86ie/scripts/rebuild.sh | 6 + tools/fuzz/x86ie/scripts/run.sh | 10 + tools/fuzz/x86ie/scripts/summarize.sh | 9 + tools/fuzz/x86ie/simple-harness.c | 49 +++ tools/fuzz/x86ie/stubs.c | 56 +++ tools/fuzz/x86ie/stubs.h | 52 +++ 23 files changed, 1172 insertions(+) create mode 100644 tools/fuzz/x86ie/.gitignore create mode 100644 tools/fuzz/x86ie/Makefile create mode 100644 tools/fuzz/x86ie/README.md create mode 100644 tools/fuzz/x86ie/afl-harness.c create mode 100644 tools/fuzz/x86ie/common.h create mode 100644 tools/fuzz/x86ie/emulator_ops.c create mode 100644 tools/fuzz/x86ie/emulator_ops.h create mode 100755 tools/fuzz/x86ie/scripts/afl-many create mode 100755 tools/fuzz/x86ie/scripts/bin.sh create mode 100755 tools/fuzz/x86ie/scripts/build.sh create mode 100755 tools/fuzz/x86ie/scripts/coalesce.sh create mode 100644 tools/fuzz/x86ie/scripts/deploy.sh create mode 100755 tools/fuzz/x86ie/scripts/deploy_remote.sh create mode 100755 tools/fuzz/x86ie/scripts/gen_output.sh create mode 100755 tools/fuzz/x86ie/scripts/install_afl.sh create mode 100755 tools/fuzz/x86ie/scripts/install_deps_ubuntu.sh create mode 100755 tools/fuzz/x86ie/scripts/rebuild.sh create mode 100755 tools/fuzz/x86ie/scripts/run.sh create mode 100755 tools/fuzz/x86ie/scripts/summarize.sh create mode 100644 tools/fuzz/x86ie/simple-harness.c create mode 100644 tools/fuzz/x86ie/stubs.c create mode 100644 tools/fuzz/x86ie/stubs.h -- 2.17.1 Amazon Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Ralf Herbrich Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B Sitz: Berlin Ust-ID: DE 289 237 879
