On Sat, Oct 21, 2017 at 03:24:46PM +0200, Nicolas Belouin wrote:
> These checks are meant to prevent leaks or attacks via directory
> traversal, the use of CAP_SYS_ADMIN here is a misuse,
> CAP_DAC_READ_SEARCH being way more appropriate as a process
> with CAP_DAC_READ_SEARCH is entrusted with going trough all directories.
> CAP_SYS_ADMIN is not meant to flag such a process.
>
> Signed-off-by: Nicolas Belouin <[email protected]>
No. lookup_dcookie() is a horrid, horrid, hack which is
*spectacularly* dangerous. We should not be trying to encourage its
use for anything beside its single legacy user, oprofile(8), for which
CAP_SYS_ADMIN is appropriate.
- Ted
