[PATCH 0/5] Config Enforcer

Andy Whitcroft apw at canonical.com
Thu Dec 10 17:41:44 GMT 2009


It was proposed that we add a config enforcer build check to the kernel
build process.  This checker reviews the configuration at build time to
confirm that specific options have specific values.  This allows us to
confirm and enforce the values of cirtain values.  Where those values
are not set the build will fail.

This patch set adds a new check phase 'prepare-checks' which is triggered
when the prepare phase is running.  It then adds a new config-prepare-check
which looks at the newly generated config and checks the specified options.

The config option checks are specified debian.master/configs/enforce.
This contains a predicate based language.  Each line represents one
check, if the the line evaluates false then the check is deemed failed.
Each line is made up of one or more predicates which are assertions.
The primary assertions relate to the existance and values of parameters:

  value CONFIG_SYN_COOKIES y
  exists CONFIG_SYN_COOKIES

The rest of the assertions check environmentatal factors such as architecture
and flavour names:

  arch armel
  flavour generic

These may be combined using and/or and parentheses, the resulting formular
is then executed and if the overall result is true the line is ok.  This allows us to ensure options are set to different values based on architecture:

  (( arch armel | arch sparc ) & value CONFIG_DEFAULT_MMAP_MIN_ADDR 32768 ) | \
       ( value CONFIG_DEFAULT_MMAP_MIN_ADDR 65536)

Following this email are 5 patches.  The first brings the new checker
and some basic rules.  The remainder fix up the various violations.

-apw

Andy Whitcroft (5):
  UBUNTU: config-check -- add a configuration enforcer
  UBUNTU: [Config] Enable CONFIG_SYN_COOKIES for versatile
  UBUNTU: [Config] Enable CONFIG_SECURITY_SMACK for ports
  UBUNTU: [Config] Enable CONFIG_SECURITY_FILE_CAPABILITIES for ports
  UBUNTU: [Config] Disable CONFIG_COMPAT_BRK for ports

 debian.master/config/amd64/config.common.amd64 |    1 -
 debian.master/config/armel/config.common.armel |    1 -
 debian.master/config/config.common.ports       |    7 +-
 debian.master/config/config.common.ubuntu      |    1 +
 debian.master/config/enforce                   |   25 ++++
 debian.master/config/i386/config.common.i386   |    1 -
 debian.master/config/lpia/config.common.lpia   |    1 -
 debian.master/rules.d/2-binary-arch.mk         |    2 +-
 debian.master/rules.d/4-checks.mk              |    8 +
 debian.master/scripts/config-check             |  168 ++++++++++++++++++++++++
 debian.master/scripts/misc/kernelconfig        |   25 ++++-
 11 files changed, 231 insertions(+), 9 deletions(-)
 create mode 100644 debian.master/config/enforce
 create mode 100755 debian.master/scripts/config-check




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