dbbbe1105e
The existing condition tested for process effective capabilities set by
file attributes but intended to ignore the change if the result was
unsurprisingly an effective full set in the case root is special with a
setuid root executable file and we are root.
Stated again:
- When you execute a setuid root application, it is no surprise and
expected that it got all capabilities, so we do not want capabilities
recorded.
if (pE_grew && !(pE_fullset && (eff_root || real_root) && root_priveleged) )
Now make sure we cover other cases:
- If something prevented a setuid root app getting all capabilities and
it wound up with one capability only, then it is a surprise and should
be logged. When it is a setuid root file, we only want capabilities
when the process does not get full capabilities..
root_priveleged && setuid_root && !pE_fullset
- Similarly if a non-setuid program does pick up capabilities due to
file system based capabilities, then we want to know what capabilities
were picked up. When it has file system based capabilities we want
the capabilities.
!is_setuid && (has_fcap && pP_gained)
- If it is a non-setuid file and it gets ambient capabilities, we want
the capabilities.
!is_setuid && pA_gained
- These last two are combined into one due to the common first parameter.
Related: https://github.com/linux-audit/audit-kernel/issues/16
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Reviewed-by: Serge Hallyn <serge@hallyn.com>
Acked-by: James Morris <james.l.morris@oracle.com>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.