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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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Yao Sang
838f411b8e
[ Upstream commit2365343f4a] mlx4_init_user_cqes() fills a scratch buffer with the CQE initialization pattern and then copies from that buffer to userspace. In the single-copy path, the copy length is array_size(entries, cqe_size), but the scratch buffer is allocated with PAGE_SIZE. GCC 10 does not carry the branch invariant strongly enough through the object size checks and falsely triggers __bad_copy_from(). Size the scratch buffer to the actual copy length for the active path, keep array_size() for the single-copy case, and retain a WARN_ON_ONCE() guard for the PAGE_SIZE invariant before allocating the buffer. Fixes:f69bf5dee7("net/mlx4: Use array_size() helper in copy_to_user()") Signed-off-by: Yao Sang <sangyao@kylinos.cn> Reviewed-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.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.