Linus Torvalds 909d3b571e
Merge tag 'vfs-6.13.pidfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs ...
Pull pidfs update from Christian Brauner:
"This adds a new ioctl to retrieve information about a pidfd.
A common pattern when using pidfds is having to get information about
the process, which currently requires /proc being mounted, resolving
the fd to a pid, and then do manual string parsing of /proc/N/status
and friends. This needs to be reimplemented over and over in all
userspace projects (e.g.: it has been reimplemented in systemd, dbus,
dbus-daemon, polkit so far), and requires additional care in checking
that the fd is still valid after having parsed the data, to avoid
races.
Having a programmatic API that can be used directly removes all these
requirements, including having /proc mounted.
As discussed at LPC24, add an ioctl with an extensible struct so that
more parameters can be added later if needed. Start with returning
pid/tgid/ppid and some creds unconditionally, and cgroupid optionally"
* tag 'vfs-6.13.pidfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
pidfd: add ioctl to retrieve pid info
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