Add support for seccomp filter that limits setresuid/setresgid.

Add a new function that installs a seccomp filter that checks
all setresuid/setresgid syscalls to fall within the passed in
uid/gid range. It allows all other syscalls through. Therefore,
this filter is meant to be used in addition to one of the
regular whitelist syscall filters. (If multiple seccomp filters
are installed a in process, all filters are run, and the most
restrictive result is used).

Since the regular app and app_zygote seccomp filters block all
other calls to change uid/gid (setuid, setgid, setgroups,
setreuid, setregid, setfsuid), combining these filters prevents
the process from using any other uid/gid than the one passed as
arguments to the new function.

Bug: 111434506
Test: atest CtsSeccompHostTestCases
Change-Id: If330efdafbedd8e7d38ca81896a4dbb0bc49f431

0 files changed, 0 insertions, 0 deletions