linux-kernel - [PATCH v4] livepatch: shadow variables

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Date:   Mon, 14 Aug 2017 16:02:42 -0400
From:   Joe Lawrence <joe.lawrence@...hat.com>
To:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>, Jessica Yu <jeyu@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>, Petr Mladek <pmladek@...e.com>
Subject: [PATCH v4] livepatch: shadow variables

v4

- klp_shadow_attach(), klp_shadow_get_or_attach(), and
  klp_shadow_update_or_attach()
  - fix up return values depending on whether a new_shadow
    variable was allocated, or an existing one was used
  - kfree new_shadow, not shadow_data when shadow variable is found
    under the lock (2nd search try)
  - refactor away most of the exit labels
  - move klp_shadow_set() calls outside of the klp_shadow_lock
  - fix multiline comment format

- klp_shadow_attach()
  - drop unnecessary variable assignment for conditional

- s/shadow_match()/klp_shadow_match()/g

- klp_shadow_match(), klp_shadow_set(), klp_shadow_add()
  - add "caller should hold lock" comments

- Documentation
  - remove unnecessary klp_shadow_get() call in use-case
  - s/its shadow variable lifetimes/their shadow variables lifetimes/

Joe Lawrence (1):
  livepatch: introduce shadow variable API

 Documentation/livepatch/shadow-vars.txt   | 215 +++++++++++++++++
 include/linux/livepatch.h                 |  10 +
 kernel/livepatch/Makefile                 |   2 +-
 kernel/livepatch/shadow.c                 | 382 ++++++++++++++++++++++++++++++
 samples/Kconfig                           |   5 +-
 samples/livepatch/Makefile                |   3 +
 samples/livepatch/livepatch-shadow-fix1.c | 174 ++++++++++++++
 samples/livepatch/livepatch-shadow-fix2.c | 167 +++++++++++++
 samples/livepatch/livepatch-shadow-mod.c  | 224 ++++++++++++++++++
 9 files changed, 1178 insertions(+), 4 deletions(-)
 create mode 100644 Documentation/livepatch/shadow-vars.txt
 create mode 100644 kernel/livepatch/shadow.c
 create mode 100644 samples/livepatch/livepatch-shadow-fix1.c
 create mode 100644 samples/livepatch/livepatch-shadow-fix2.c
 create mode 100644 samples/livepatch/livepatch-shadow-mod.c

-- 
1.8.3.1