Syscall auditing lite

I've made no secret of the fact that I dislike syscall auditing. As far as I can tell, the main technical (i.e. not compliance-related) use of syscall auditing is to supply some useful context information to go along with events like AVC denials.

CONFIG_AUDITSYSCALL is serious overkill to do this. kernel/auditsc.c is ~2500 lines of terror.

This patchset accomplishes the same goal, more usefully, with no overhead at all, in under 70 lines of code. It tries to coexist cleanly with CONFIG_AUDITSYSCALL.

This is only implemented for x86. Other architectures can add support fairly easily, I think.

Andy Lutomirski (2):
x86,syscall: Add syscall_in_syscall to test whether we're in a syscall
audit: Syscall auditing lite

 arch/x86/Kconfig               |  1 +
 arch/x86/include/asm/syscall.h | 21 ++++++++++++++++++++
 init/Kconfig                   |  3 +++
 kernel/audit.c                 | 44 +++++++++++++++++++++++++++++++++++++++++-
 4 files changed, 68 insertions(+), 1 deletion(-)

1.9.3