[PATCH 00/21] sandbox: add libfuzzer-based fuzzing

[Ahmad Fatoum]

We have a number of security-sensitive parsers in barebox that process
untrusted input, even in secure boot systems, e.g. the FIT parser, but
also the partition parser.

This series adds fuzzing tests for a number of these parsers based on
libfuzzer.

Ahmad Fatoum (21):
  pbl: add provision for architectures without piggy loader
  firmware: make Layerscape FMan firmware proper-only
  mci: sdhci: support compiling common SDHCI code for sandbox PBL
  kbuild: define and use more generic symlink command
  kbuild: collect compatibility symlink creation in symlink-y
  kbuild: allow customizing barebox proper binary
  sandbox: make available all CONFIG_ symbols to OS glue code
  sandbox: switch to using PBL
  kbuild: populate non-host CXX variables
  string: add fortify source support
  sandbox: populate UNAME_M variable
  Add fuzzing infrastructure
  filetype: add fuzz target
  block: mark underlying cdev with DEVFS_IS_BLOCK_DEV
  block: add lightweight ramdisk support
  fuzz: add support for passing fuzz data as r/o ramdisk
  partitions: add partition table parser fuzz target
  fdt: add fuzz test
  fit: add fuzz test
  Documentation: add LLVM libfuzzer documentation
  sandbox: add support for coverage info generation

 .gitignore                                    |   6 +
 Documentation/devel/devel.rst                 |   1 +
 Documentation/devel/fuzzing.rst               | 136 +++
 Makefile                                      |  72 +-
 arch/Kconfig                                  |   6 +
 arch/sandbox/Kconfig                          |  10 +
 arch/sandbox/Kconfig.debug                    |   7 +
 arch/sandbox/Makefile                         |  91 +-
 arch/sandbox/board/.gitignore                 |   3 -
 arch/sandbox/board/Makefile                   |   2 -
 arch/sandbox/include/asm/barebox-sandbox.h    |  10 +
 arch/sandbox/lib/.gitignore                   |   3 +
 arch/sandbox/lib/Makefile                     |   2 +-
 .../{board/barebox.lds.S => lib/pbl.lds.S}    |   0
 arch/sandbox/os/Makefile                      |  24 +-
 arch/sandbox/os/common.c                      | 138 ++-
 arch/sandbox/{lib => os}/unwind.c             |   3 +-
 arch/x86/um/Makefile                          |   4 +-
 commands/Makefile                             |   1 +
 commands/fuzz.c                               | 118 +++
 commands/stacksmash.c                         |   6 +-
 common/Kconfig                                |   7 +-
 common/block.c                                |   9 +-
 common/boards/configs/libfuzzer.config        |  14 +
 common/filetype.c                             |  12 +
 common/image-fit.c                            |  76 +-
 common/partitions.c                           |  56 ++
 common/startup.c                              |   1 +
 drivers/block/Kconfig                         |   6 +
 drivers/block/Makefile                        |   1 +
 drivers/block/ramdisk.c                       | 178 ++++
 drivers/of/fdt.c                              |  39 +
 firmware/Makefile                             |   3 +-
 images/.gitignore                             |   2 +
 images/Makefile                               |  26 +-
 images/Makefile.sandbox                       |  33 +
 include/asm-generic/barebox.lds.h             |  13 +-
 include/block.h                               |  13 +-
 include/dma.h                                 |  22 +-
 include/driver.h                              |   1 +
 include/filetype.h                            |   4 +-
 include/fuzz.h                                |  87 ++
 include/linux/compiler_types.h                |  41 +
 include/linux/fortify-string.h                | 804 ++++++++++++++++++
 include/linux/string.h                        |  17 +
 include/mci.h                                 |   9 +
 include/ramdisk.h                             |  24 +
 lib/Kconfig.hardening                         |  15 +
 lib/Makefile                                  |   3 +-
 lib/fuzz.c                                    |  79 ++
 lib/string.c                                  |  16 +-
 lib/string_helpers.c                          |  30 +
 lib/vsprintf.c                                |  15 +
 pbl/Kconfig                                   |  10 +-
 pbl/string.c                                  |   1 +
 scripts/Kconfig.include                       |   1 +
 scripts/Makefile.lib                          |   6 +-
 scripts/clang-runtime-dir.sh                  |  19 +
 scripts/subarch.include                       |  12 +-
 test/Kconfig                                  |  39 +
 60 files changed, 2252 insertions(+), 135 deletions(-)
 create mode 100644 Documentation/devel/fuzzing.rst
 create mode 100644 arch/sandbox/include/asm/barebox-sandbox.h
 create mode 100644 arch/sandbox/lib/.gitignore
 rename arch/sandbox/{board/barebox.lds.S => lib/pbl.lds.S} (100%)
 rename arch/sandbox/{lib => os}/unwind.c (88%)
 create mode 100644 commands/fuzz.c
 create mode 100644 common/boards/configs/libfuzzer.config
 create mode 100644 drivers/block/ramdisk.c
 create mode 100644 images/Makefile.sandbox
 create mode 100644 include/fuzz.h
 create mode 100644 include/linux/fortify-string.h
 create mode 100644 include/ramdisk.h
 create mode 100644 lib/fuzz.c
 create mode 100644 lib/string_helpers.c
 create mode 100755 scripts/clang-runtime-dir.sh

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2.39.5