On Tue, Sep 25, 2018 at 07:37:45PM +0200, Greg KH wrote: > On Tue, Sep 25, 2018 at 01:26:55PM -0400, Tong Zhang wrote: > > Kernel Version: 4.18.5 > > > > Problem Description: > > > > We discovered inconsistent check when using prctl_set_mm_exe_file(), which > > is used to setup exe file link. > > > > It is required to have capable(CAP_SYS_RESOURCE) in prctl_set_mm(). > > while ns_capable(CAP_SYS_ADMIN) in prctl_set_mm_map(). > > > > There are two differences: > > 1)requiring capability from: user namespace, init namespace. > > 2)capability bit required is different > > Can you submit a patch showing what you think is the correct fix here?
It is done this way on purpose. The prctl_set_mm_map is a complex call which carries a bunch of parameters and allowed if you're inside user-ns admin, in turn prctl_set_mm allows to modify settings one by one. So no, it is not an error but rather call specifics.
