On Tue, Jun 05, 2018 at 10:59:51AM +0400, Ilya Matveychikov wrote: > Just CC’ed to some of maintainers. > > $ perl scripts/get_maintainer.pl > fs/0001-ksys_mount-check-for-permissions-before-resource-all.patch > Alexander Viro <[email protected]> (maintainer:FILESYSTEMS (VFS and > infrastructure)) > [email protected] (open list:FILESYSTEMS (VFS and infrastructure)) > [email protected] (open list) > > > On Jun 5, 2018, at 6:00 AM, Ilya Matveychikov <[email protected]> > > wrote: > > > > Early check for mount permissions prevents possible allocation of 3 > > pages from kmalloc() pool by unpriveledged user which can be used for > > spraying the kernel heap.
I'm sorry, but there are arseloads of unpriveleged syscalls that do the same, starting with read() from procfs files. So what the hell does it buy?
