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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Scott Wood <swood@redhat.com>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@kernel.org>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 5.4 40/40] sched/core: Check cpus_mask, not cpus_ptr in __set_cpus_allowed_ptr(), to fix mask corruption
Date: Wed,  1 Jul 2020 21:24:01 -0400	[thread overview]
Message-ID: <20200702012402.2701121-40-sashal@kernel.org> (raw)
In-Reply-To: <20200702012402.2701121-1-sashal@kernel.org>

From: Scott Wood <swood@redhat.com>

[ Upstream commit fd844ba9ae59b51e34e77105d79f8eca780b3bd6 ]

This function is concerned with the long-term CPU mask, not the
transitory mask the task might have while migrate disabled.  Before
this patch, if a task was migrate-disabled at the time
__set_cpus_allowed_ptr() was called, and the new mask happened to be
equal to the CPU that the task was running on, then the mask update
would be lost.

Signed-off-by: Scott Wood <swood@redhat.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200617121742.cpxppyi7twxmpin7@linutronix.de
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 361cbc2dc9667..f5537f87c1928 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1649,7 +1649,7 @@ static int __set_cpus_allowed_ptr(struct task_struct *p,
 		goto out;
 	}
 
-	if (cpumask_equal(p->cpus_ptr, new_mask))
+	if (cpumask_equal(&p->cpus_mask, new_mask))
 		goto out;
 
 	dest_cpu = cpumask_any_and(cpu_valid_mask, new_mask);
-- 
2.25.1


      parent reply	other threads:[~2020-07-02  1:26 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-02  1:23 [PATCH AUTOSEL 5.4 01/40] regmap: fix alignment issue Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 02/40] perf/x86/rapl: Move RAPL support to common x86 code Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 03/40] perf/x86/rapl: Fix RAPL config variable bug Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 04/40] ARM: dts: omap4-droid4: Fix spi configuration and increase rate Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 05/40] drm/ttm: Fix dma_fence refcnt leak when adding move fence Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 06/40] drm/tegra: hub: Do not enable orphaned window group Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 07/40] gpu: host1x: Detach driver on unregister Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 08/40] btrfs: use kfree() in btrfs_ioctl_get_subvol_info() Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 09/40] drm: mcde: Fix display initialization problem Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 10/40] ASoC: SOF: Intel: add PCI ID for CometLake-S Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 11/40] ASoC: SOF: Intel: add PCI IDs for ICL-H and TGL-H Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 12/40] net: usb: ax88179_178a: fix packet alignment padding Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 13/40] ALSA: hda: Intel: add missing PCI IDs for ICL-H, TGL-H and EKL Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 14/40] usb: usbtest: fix missing kfree(dev->buf) in usbtest_disconnect Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 15/40] spi: spidev: fix a race between spidev_release and spidev_remove Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 16/40] spi: spidev: fix a potential use-after-free in spidev_release() Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 17/40] net: ethernet: mvneta: Fix Serdes configuration for SoCs without comphy Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 18/40] net: ethernet: mvneta: Add 2500BaseX support " Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 19/40] tg3: driver sleeps indefinitely when EEH errors exceed eeh_max_freezes Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 20/40] ixgbe: protect ring accesses with READ- and WRITE_ONCE Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 21/40] i40e: " Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 22/40] ibmvnic: continue to init in CRQ reset returns H_CLOSED Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 23/40] powerpc/kvm/book3s64: Fix kernel crash with nested kvm & DEBUG_VIRTUAL Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 24/40] usbnet: smsc95xx: Fix use-after-free after removal Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 25/40] iommu/vt-d: Don't apply gfx quirks to untrusted devices Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 26/40] drm: panel-orientation-quirks: Add quirk for Asus T101HA panel Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 27/40] drm: panel-orientation-quirks: Use generic orientation-data for Acer S1003 Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 28/40] s390/kasan: fix early pgm check handler execution Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 29/40] s390/debug: avoid kernel warning on too large number of pages Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 30/40] cifs: Fix double add page to memcg when cifs_readpages Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 31/40] drm/sun4i: mixer: Call of_dma_configure if there's an IOMMU Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 32/40] cifs: update ctime and mtime during truncate Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 33/40] ARM: imx6: add missing put_device() call in imx6q_suspend_init() Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 34/40] scsi: mptscsih: Fix read sense data size Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 35/40] usb: dwc3: pci: Fix reference count leak in dwc3_pci_resume_work Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 36/40] block: release bip in a right way in error path Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 37/40] nvme-rdma: assign completion vector correctly Sasha Levin
2020-07-02  1:23 ` [PATCH AUTOSEL 5.4 38/40] x86/entry: Increase entry_stack size to a full page Sasha Levin
2020-07-02  1:24 ` [PATCH AUTOSEL 5.4 39/40] kgdb: Avoid suspicious RCU usage warning Sasha Levin
2020-07-02  1:24 ` Sasha Levin [this message]

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