From: Arnd Bergmann <arnd@arndb.de>
To: Lucas Stach <l.stach@pengutronix.de>
Cc: y2038@lists.linaro.org, "Arnd Bergmann" <arnd@arndb.de>,
"Russell King" <linux+etnaviv@armlinux.org.uk>,
"Christian Gmeiner" <christian.gmeiner@gmail.com>,
"David Airlie" <airlied@linux.ie>,
"Daniel Vetter" <daniel@ffwll.ch>,
"Guido Günther" <agx@sigxcpu.org>,
"Philipp Zabel" <p.zabel@pengutronix.de>,
etnaviv@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] drm/etnaviv: reject timeouts with tv_nsec >= NSEC_PER_SEC
Date: Mon, 11 Nov 2019 17:25:31 +0100 [thread overview]
Message-ID: <20191111162547.2221524-1-arnd@arndb.de> (raw)
Most kernel interfaces that take a timespec require normalized
representation with tv_nsec between 0 and NSEC_PER_SEC.
Passing values larger than 0x100000000ull further behaves differently
on 32-bit and 64-bit kernels, and can cause the latter to spend a long
time counting seconds in timespec64_sub()/set_normalized_timespec64().
Reject those large values at the user interface to enforce sane and
portable behavior.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/gpu/drm/etnaviv/etnaviv_drv.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_drv.c b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
index 1f9c01be40d7..95d72dc00280 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
@@ -297,6 +297,9 @@ static int etnaviv_ioctl_gem_cpu_prep(struct drm_device *dev, void *data,
if (args->op & ~(ETNA_PREP_READ | ETNA_PREP_WRITE | ETNA_PREP_NOSYNC))
return -EINVAL;
+ if (args->timeout.tv_nsec > NSEC_PER_SEC)
+ return -EINVAL;
+
obj = drm_gem_object_lookup(file, args->handle);
if (!obj)
return -ENOENT;
@@ -360,6 +363,9 @@ static int etnaviv_ioctl_wait_fence(struct drm_device *dev, void *data,
if (args->flags & ~(ETNA_WAIT_NONBLOCK))
return -EINVAL;
+ if (args->timeout.tv_nsec > NSEC_PER_SEC)
+ return -EINVAL;
+
if (args->pipe >= ETNA_MAX_PIPES)
return -EINVAL;
@@ -411,6 +417,9 @@ static int etnaviv_ioctl_gem_wait(struct drm_device *dev, void *data,
if (args->flags & ~(ETNA_WAIT_NONBLOCK))
return -EINVAL;
+ if (args->timeout.tv_nsec > NSEC_PER_SEC)
+ return -EINVAL;
+
if (args->pipe >= ETNA_MAX_PIPES)
return -EINVAL;
--
2.20.0
next reply other threads:[~2019-11-11 16:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-11 16:25 Arnd Bergmann [this message]
2019-11-11 16:25 ` [PATCH 2/2] [v2] drm/etnaviv: avoid deprecated timespec Arnd Bergmann
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