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Michael Karcher 91eda032eb sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC III [ Upstream commit `47b49c06eb` ] Anthony Yznaga tracked down that a BUG_ON in ext4 code with large folios enabled resulted from copy_from_user() returning impossibly large values greater than the size to be copied. This lead to __copy_from_iter() returning impossible values instead of the actual number of bytes it was able to copy. The BUG_ON has been reported in https://lore.kernel.org/r/b14f55642207e63e907965e209f6323a0df6dcee.camel@physik.fu-berlin.de The referenced commit introduced exception handlers on user-space memory references in copy_from_user and copy_to_user. These handlers return from the respective function and calculate the remaining bytes left to copy using the current register contents. The exception handlers expect that %o2 has already been masked during the bulk copy loop, but the masking was performed after that loop. This will fix the return value of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged. Fixes: `ee841d0aff` ("sparc64: Convert U3copy_{from,to}_user to accurate exception reporting.") Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> # on Sun Netra 240 Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com> Tested-by: René Rebe <rene@exactcode.com> # on UltraSparc III+ and UltraSparc IIIi Signed-off-by: Michael Karcher <kernel@mkarcher.dialup.fu-berlin.de> Reviewed-by: Andreas Larsson <andreas@gaisler.com> Link: https://lore.kernel.org/r/20250905-memcpy_series-v4-2-1ca72dda195b@mkarcher.dialup.fu-berlin.de Signed-off-by: Andreas Larsson <andreas@gaisler.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-10-15 11:56:35 +02:00
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README

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.