From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>, Jakub Kicinski <kuba@kernel.org>,
Sasha Levin <sashal@kernel.org>,
netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 5.9 17/39] tun: honor IOCB_NOWAIT flag
Date: Thu, 3 Dec 2020 08:28:11 -0500 [thread overview]
Message-ID: <20201203132834.930999-17-sashal@kernel.org> (raw)
In-Reply-To: <20201203132834.930999-1-sashal@kernel.org>
From: Jens Axboe <axboe@kernel.dk>
[ Upstream commit 5aac0390a63b8718237a61dd0d24a29201d1c94a ]
tun only checks the file O_NONBLOCK flag, but it should also be checking
the iocb IOCB_NOWAIT flag. Any fops using ->read/write_iter() should check
both, otherwise it breaks users that correctly expect O_NONBLOCK semantics
if IOCB_NOWAIT is set.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/e9451860-96cc-c7c7-47b8-fe42cadd5f4c@kernel.dk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/tun.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 7959b5c2d11f1..b5f47d37ea1be 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1979,12 +1979,15 @@ static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from)
struct tun_file *tfile = file->private_data;
struct tun_struct *tun = tun_get(tfile);
ssize_t result;
+ int noblock = 0;
if (!tun)
return -EBADFD;
- result = tun_get_user(tun, tfile, NULL, from,
- file->f_flags & O_NONBLOCK, false);
+ if ((file->f_flags & O_NONBLOCK) || (iocb->ki_flags & IOCB_NOWAIT))
+ noblock = 1;
+
+ result = tun_get_user(tun, tfile, NULL, from, noblock, false);
tun_put(tun);
return result;
@@ -2203,10 +2206,15 @@ static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to)
struct tun_file *tfile = file->private_data;
struct tun_struct *tun = tun_get(tfile);
ssize_t len = iov_iter_count(to), ret;
+ int noblock = 0;
if (!tun)
return -EBADFD;
- ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK, NULL);
+
+ if ((file->f_flags & O_NONBLOCK) || (iocb->ki_flags & IOCB_NOWAIT))
+ noblock = 1;
+
+ ret = tun_do_read(tun, tfile, to, noblock, NULL);
ret = min_t(ssize_t, ret, len);
if (ret > 0)
iocb->ki_pos = ret;
--
2.27.0
next prev parent reply other threads:[~2020-12-03 13:39 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-03 13:27 [PATCH AUTOSEL 5.9 01/39] phy: usb: Fix incorrect clearing of tca_drv_sel bit in SETUP reg for 7211 Sasha Levin
2020-12-03 13:27 ` [PATCH AUTOSEL 5.9 02/39] arm64: dts: rockchip: Remove system-power-controller from pmic on Odroid Go Advance Sasha Levin
2020-12-03 13:27 ` [PATCH AUTOSEL 5.9 03/39] iwlwifi: pcie: limit memory read spin time Sasha Levin
2020-12-03 13:27 ` [PATCH AUTOSEL 5.9 04/39] arm64: dts: rockchip: Assign a fixed index to mmc devices on rk3399 boards Sasha Levin
2020-12-03 13:27 ` [PATCH AUTOSEL 5.9 05/39] arm64: dts: rockchip: Reorder LED triggers from mmc devices on rk3399-roc-pc Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 06/39] iwlwifi: sta: set max HE max A-MPDU according to HE capa Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 07/39] iwlwifi: pcie: set LTR to avoid completion timeout Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 08/39] iwlwifi: mvm: fix kernel panic in case of assert during CSA Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 09/39] powerpc: Drop -me200 addition to build flags Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 10/39] arm64: dts: broadcom: clear the warnings caused by empty dma-ranges Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 11/39] ARC: stack unwinding: don't assume non-current task is sleeping Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 12/39] scsi: ufs: Fix unexpected values from ufshcd_read_desc_param() Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 13/39] scsi: ufs: Make sure clk scaling happens only when HBA is runtime ACTIVE Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 14/39] interconnect: qcom: msm8916: Remove rpm-ids from non-RPM nodes Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 15/39] interconnect: qcom: qcs404: Remove GPU and display RPM IDs Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 16/39] usbnet: ipheth: fix connectivity with iOS 14 Sasha Levin
2020-12-03 13:28 ` Sasha Levin [this message]
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 18/39] ibmvnic: skip tx timeout reset while in resetting Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 19/39] irqchip/gic-v3-its: Unconditionally save/restore the ITS state on suspend Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 20/39] drm/exynos: depend on COMMON_CLK to fix compile tests Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 21/39] spi: spi-nxp-fspi: fix fspi panic by unexpected interrupts Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 22/39] arm-smmu-qcom: Ensure the qcom_scm driver has finished probing Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 23/39] habanalabs/gaudi: fix missing code in ECC handling Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 24/39] btrfs: do nofs allocations when adding and removing qgroup relations Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 25/39] btrfs: fix lockdep splat when enabling and disabling qgroups Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 26/39] soc: fsl: dpio: Get the cpumask through cpumask_of(cpu) Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 27/39] sched/idle: Fix arch_cpu_idle() vs tracing Sasha Levin
2020-12-03 14:54 ` Heiko Carstens
2020-12-03 17:10 ` Peter Zijlstra
2020-12-13 14:10 ` Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 28/39] intel_idle: Fix intel_idle() " Sasha Levin
2020-12-03 17:10 ` Peter Zijlstra
2020-12-13 14:11 ` Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 29/39] arm64: tegra: Disable the ACONNECT for Jetson TX2 Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 30/39] platform/x86: thinkpad_acpi: add P1 gen3 second fan support Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 31/39] platform/x86: thinkpad_acpi: Do not report SW_TABLET_MODE on Yoga 11e Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 32/39] platform/x86: thinkpad_acpi: Add BAT1 is primary battery quirk for Thinkpad Yoga 11e 4th gen Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 33/39] platform/x86: thinkpad_acpi: Whitelist P15 firmware for dual fan control Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 34/39] platform/x86: acer-wmi: add automatic keyboard background light toggle key as KEY_LIGHTS_TOGGLE Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 35/39] platform/x86: intel-vbtn: Support for tablet mode on HP Pavilion 13 x360 PC Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 36/39] platform/x86: touchscreen_dmi: Add info for the Predia Basic tablet Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 37/39] platform/x86: touchscreen_dmi: Add info for the Irbis TW118 tablet Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 38/39] can: m_can: m_can_dev_setup(): add support for bosch mcan version 3.3.0 Sasha Levin
2020-12-03 13:28 ` [PATCH AUTOSEL 5.9 39/39] can: af_can: can_rx_unregister(): remove WARN() statement from list operation sanity check Sasha Levin
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