[PATCH v3 0/3] add fault injection to user memory access

[albert . linde]

From: Albert van der Linde <alinde@xxxxxxxxxx>

The goal of this series is to improve testing of fault-tolerance in
usages of user memory access functions, by adding support for fault
injection.

The first patch adds failure injection capability for usercopy
functions. The second changes usercopy functions to use this new failure
capability (copy_from_user, ...). The third patch adds
get/put/clear_user failures to x86.

Changes in v2:
 - simplified overall failure capability by either failing or not, without
   having functions fail partially by copying/clearing only some bytes

Changes in v3:
 - adressed comments from Peter Zijlstra: fixed inconsistent ordering
   with might_fault()

Albert van der Linde (3):
  lib, include/linux: add usercopy failure capability
  lib, uaccess: add failure injection to usercopy functions
  x86: add failure injection to get/put/clear_user

 .../admin-guide/kernel-parameters.txt         |  1 +
 .../fault-injection/fault-injection.rst       |  7 +-
 arch/x86/include/asm/uaccess.h                | 68 +++++++++++--------
 arch/x86/lib/usercopy_64.c                    |  3 +
 include/linux/fault-inject-usercopy.h         | 22 ++++++
 include/linux/uaccess.h                       | 11 ++-
 lib/Kconfig.debug                             |  7 ++
 lib/Makefile                                  |  1 +
 lib/fault-inject-usercopy.c                   | 39 +++++++++++
 lib/iov_iter.c                                |  5 ++
 lib/strncpy_from_user.c                       |  3 +
 lib/usercopy.c                                |  5 +-
 12 files changed, 140 insertions(+), 32 deletions(-)
 create mode 100644 include/linux/fault-inject-usercopy.h
 create mode 100644 lib/fault-inject-usercopy.c

-- 
2.28.0.402.g5ffc5be6b7-goog