Messages in this thread | | | From | Jiang Lu <> | Subject | [v2]serial_core:recognize invalid pointer from userspace | Date | Thu, 10 Mar 2016 11:17:22 +0800 |
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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
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