From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Oleg Nesterov <oleg@redhat.com>,
Davidlohr Bueso <dbueso@suse.de>, Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 4.9 23/42] block: fix ioprio_get(IOPRIO_WHO_PGRP) vs setuid(2)
Date: Mon, 13 Dec 2021 10:30:05 +0100 [thread overview]
Message-ID: <20211213092927.332822590@linuxfoundation.org> (raw)
In-Reply-To: <20211213092926.578829548@linuxfoundation.org>
From: Davidlohr Bueso <dave@stgolabs.net>
commit e6a59aac8a8713f335a37d762db0dbe80e7f6d38 upstream.
do_each_pid_thread(PIDTYPE_PGID) can race with a concurrent
change_pid(PIDTYPE_PGID) that can move the task from one hlist
to another while iterating. Serialize ioprio_get to take
the tasklist_lock in this case, just like it's set counterpart.
Fixes: d69b78ba1de (ioprio: grab rcu_read_lock in sys_ioprio_{set,get}())
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Link: https://lore.kernel.org/r/20211210182058.43417-1-dave@stgolabs.net
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
block/ioprio.c | 3 +++
1 file changed, 3 insertions(+)
--- a/block/ioprio.c
+++ b/block/ioprio.c
@@ -202,6 +202,7 @@ SYSCALL_DEFINE2(ioprio_get, int, which,
pgrp = task_pgrp(current);
else
pgrp = find_vpid(who);
+ read_lock(&tasklist_lock);
do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
tmpio = get_task_ioprio(p);
if (tmpio < 0)
@@ -211,6 +212,8 @@ SYSCALL_DEFINE2(ioprio_get, int, which,
else
ret = ioprio_best(ret, tmpio);
} while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
+ read_unlock(&tasklist_lock);
+
break;
case IOPRIO_WHO_USER:
uid = make_kuid(current_user_ns(), who);
next prev parent reply other threads:[~2021-12-13 9:35 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-13 9:29 [PATCH 4.9 00/42] 4.9.293-rc1 review Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 01/42] HID: introduce hid_is_using_ll_driver Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 02/42] HID: add hid_is_usb() function to make it simpler for USB detection Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 03/42] HID: add USB_HID dependancy to hid-prodikeys Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 04/42] HID: add USB_HID dependancy to hid-chicony Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 05/42] HID: add USB_HID dependancy on some USB HID drivers Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 06/42] HID: wacom: fix problems when device is not a valid USB device Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 07/42] HID: check for valid USB device for many HID drivers Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 08/42] can: sja1000: fix use after free in ems_pcmcia_add_card() Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 09/42] nfc: fix potential NULL pointer deref in nfc_genl_dump_ses_done Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 10/42] IB/hfi1: Correct guard on eager buffer deallocation Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 11/42] mm: bdi: initialize bdi_min_ratio when bdi is unregistered Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 12/42] ALSA: ctl: Fix copy of updated id with element read/write Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 13/42] ALSA: pcm: oss: Fix negative period/buffer sizes Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 14/42] ALSA: pcm: oss: Limit the period size to 16MB Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 15/42] ALSA: pcm: oss: Handle missing errors in snd_pcm_oss_change_params*() Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 16/42] tracefs: Have new files inherit the ownership of their parent Greg Kroah-Hartman
2021-12-13 9:29 ` [PATCH 4.9 17/42] can: pch_can: pch_can_rx_normal: fix use after free Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 18/42] libata: add horkage for ASMedia 1092 Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 19/42] wait: add wake_up_pollfree() Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 20/42] binder: use wake_up_pollfree() Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 21/42] signalfd: " Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 22/42] tracefs: Set all files to the same group ownership as the mount option Greg Kroah-Hartman
2021-12-13 9:30 ` Greg Kroah-Hartman [this message]
2021-12-13 9:30 ` [PATCH 4.9 24/42] net: cdc_ncm: Allow for dwNtbOutMaxSize to be unset or zero Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 25/42] net: altera: set a couple error code in probe() Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 26/42] net: fec: only clear interrupt of handling queue in fec_enet_rx_queue() Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 27/42] net, neigh: clear whole pneigh_entry at alloc time Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 28/42] net/qla3xxx: fix an error code in ql_adapter_up() Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 29/42] USB: gadget: detect too-big endpoint 0 requests Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 30/42] USB: gadget: zero allocate endpoint 0 buffers Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 31/42] usb: core: config: fix validation of wMaxPacketValue entries Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 32/42] usb: core: config: using bit mask instead of individual bits Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 33/42] iio: stk3310: Dont return error code in interrupt handler Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 34/42] iio: mma8452: Fix trigger reference couting Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 35/42] iio: ltr501: Dont return error code in trigger handler Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 36/42] iio: kxsd9: " Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 37/42] iio: itg3200: Call iio_trigger_notify_done() on error Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 38/42] iio: accel: kxcjk-1013: Fix possible memory leak in probe and remove Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 39/42] irqchip/armada-370-xp: Fix return value of armada_370_xp_msi_alloc() Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 40/42] irqchip/armada-370-xp: Fix support for Multi-MSI interrupts Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 41/42] irqchip/irq-gic-v3-its.c: Force synchronisation when issuing INVALL Greg Kroah-Hartman
2021-12-13 9:30 ` [PATCH 4.9 42/42] irqchip: nvic: Fix offset for Interrupt Priority Offsets Greg Kroah-Hartman
2021-12-13 19:54 ` [PATCH 4.9 00/42] 4.9.293-rc1 review Guenter Roeck
2021-12-13 20:00 ` Florian Fainelli
2021-12-13 20:31 ` Shuah Khan
2021-12-14 5:53 ` Naresh Kamboju
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