linux-kernel - [PATCH -next 0/2] tasklist_lock vs get/set priority syscalls

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Message-Id: <20200817003148.23691-1-dave@stgolabs.net>
Date:   Sun, 16 Aug 2020 17:31:46 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     akpm@...ux-foundation.org
Cc:     oleg@...hat.com, axboe@...nel.dk, linux-kernel@...r.kernel.org,
        Davidlohr Bueso <dave@...olabs.net>
Subject: [PATCH -next 0/2] tasklist_lock vs get/set priority syscalls

Hi,

This is a (late) update on trying to reduce some of the scope of the tasklist_lock
for get/setpriority(2) as well as the block io equivalent. This version addresses
Oleg's previous concerns and incorporates his feedback.

Changes from v1:
https://lore.kernel.org/lkml/20200512000353.23653-1-dave@stgolabs.net/

 - only take the lock for PGID cases.
 - drop bogus PF_EXITING checks (and live with the small exit race).
 - add patch for IOPRIO_WHO_PGRP.

Please consider for v5.10.

Thanks!

Davidlohr Bueso (2):
  kernel/sys: only take tasklist_lock for get/setpriority(PRIO_PGRP)
  block: fix ioprio_get/set(IOPRIO_WHO_PGRP) vs setuid(2)

 block/ioprio.c |  4 ++++
 kernel/sys.c   | 16 ++++++++--------
 2 files changed, 12 insertions(+), 8 deletions(-)

--
2.26.2