82046b6a84
[ Upstream commit 5c152c2f66f9368394b89ac90dc7483476ef7b88 ] When arm64 signal context data overflows the base struct sigcontext it gets placed in an extra buffer pointed to by a record of type EXTRA_CONTEXT in the base struct sigcontext which is required to be the last record in the base struct sigframe. The current validation code attempts to check this by using GET_RESV_NEXT_HEAD() to step forward from the current record to the next but that is a macro which assumes it is being provided with a struct _aarch64_ctx and uses the size there to skip forward to the next record. Instead validate_extra_context() passes it a struct extra_context which has a separate size field. This compiles but results in us trying to validate a termination record in completely the wrong place, at best failing validation and at worst just segfaulting. Fix this by passing the struct _aarch64_ctx we meant to into the macro. Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20220829160703.874492-4-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 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.