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c78c95f919
if (_IOC_TYPE(cmd) != PP_IOCTL)
return -ENOTTY;
Invalid ioctl command check normally performs by “default” case.
if (_IOC_DIR(cmd) != _IOC_NONE) {
argp = (void __user *)arg;
if (!argp)
return -EINVAL; }
And for checking ioctl arguments, copy_from_user()/copy_to_user()
checks are enough.
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Harshal Chaudhari <harshalchau04@gmail.com>
Link: https://lore.kernel.org/r/20201101170949.18616-1-harshalchau04@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.