From: Jiang Lu <lu.jiang@windriver.com>
To: <gregkh@linuxfoundation.org>, <linux-kernel@vger.kernel.org>,
<linux-serial@vger.kernel.org>
Subject: [v2]serial_core:recognize invalid pointer from userspace
Date: Thu, 10 Mar 2016 11:17:22 +0800 [thread overview]
Message-ID: <1457579843-29676-1-git-send-email-lu.jiang@windriver.com> (raw)
Hi,
[v1 -> v2]
Fix a compile warning with data convert.
[v1 log]
When running setserial, application issue a TIOCGSERIAL iotcl to get serial setting, then update
serial setting with TIOCSSERIAL ioctl. It always failed with TIOCSSERIAL ioctl, for application
pass 0xffffffff for iomem_base in serial_struct to kernel.
On 32bit rootfs & 64bit kernel, compat_ioctl use 0xffffffff as a magic number to mark invalid pointer
for iomem_base in serial_struct when truncating a 64bit pointer into 32bit.
Serial driver need recognize this invalid pointer when parsing serial_struct from userspace.
Thanks
Jiang Lu
next reply other threads:[~2016-03-10 3:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-10 3:17 Jiang Lu [this message]
2016-03-10 3:17 ` [v2] serial_core:recognize invalid pointer from userspace Jiang Lu
2016-03-10 3:34 ` Greg KH
2016-03-10 4:56 ` Lu.Jiang
2016-03-10 13:46 ` One Thousand Gnomes
2016-03-11 2:30 ` Lu.Jiang
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