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c63aad695d
Just do a copyin of what we want into a local variable and be done with that. We are guaranteed to be on shallow stack here... Note that conditional expression for range passed to access_ok() in mainline had been pointless all along - the only difference between vm86plus_struct and vm86_struct is that the former has one extra field in the end and when we get to copyin of that field (conditional upon 'plus' argument), we use copy_from_user(). Moreover, all fields starting with ->int_revectored are copied that way, so we only need that check (be it done by access_ok() or by user_access_begin()) only on the beginning of the structure - the fields that used to be covered by that get_user_try() block. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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.