mm: security: Check early if HARDENED_USERCOPY is enabled

HARDENED_USERCOPY is checked within a function so even if disabled, the
function overhead still exists. Move the static check inline.

This

mm: security: Check early if HARDENED_USERCOPY is enabled

HARDENED_USERCOPY is checked within a function so even if disabled, the
function overhead still exists. Move the static check inline.

This is at best a micro-optimisation and any difference in performance
was within noise but it is relatively consistent with the init_on_*
implementations.

Suggested-by: Kees Cook <[email protected]>
Signed-off-by: Mel Gorman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Kees Cook <[email protected]>

show more ...

uaccess: Introduce ucopysize.h

The object size sanity checking macros that uaccess.h and uio.h use
have been living in thread_info.h for historical reasons. Needing to
use jump labels for these chec

uaccess: Introduce ucopysize.h

The object size sanity checking macros that uaccess.h and uio.h use
have been living in thread_info.h for historical reasons. Needing to
use jump labels for these checks, however, introduces a header include
loop under certain conditions. The dependencies for the object checking
macros are very limited, but they are used by separate header files,
so introduce a new header that can be used directly by uaccess.h and
uio.h. As a result, this also means thread_info.h (which is rather large)
and be removed from those headers.

Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Signed-off-by: Kees Cook <[email protected]>

show more ...