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8111e67dee
The stackleak_erase() code dynamically handles being on a task stack or another stack. In most cases, this is a fixed property of the caller, which the caller is aware of, as an architecture might always return using the task stack, or might always return using a trampoline stack. This patch adds stackleak_erase_on_task_stack() and stackleak_erase_off_task_stack() functions which callers can use to avoid on_thread_stack() check and associated redundant work when the calling stack is known. The existing stackleak_erase() is retained as a safe default. There should be no functional change as a result of this patch. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Alexander Popov <alex.popov@linux.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20220427173128.2603085-13-mark.rutland@arm.com |
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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.