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mmap() a file with a good offset and then munmap() it. a non-zero offset is passed to test the 6th argument of my_syscall6(). Note, it is not easy to find a unique file for mmap() in different scenes, so, a file list is used to search the right one: - /dev/zero: is commonly used to allocate anonymous memory and is likely present and readable - /proc/1/exe: for 'run' and 'run-user' target, 'run-user' can not find '/proc/self/exe' - /proc/self/exe: for 'libc-test' target, normal program 'libc-test' has no permission to access '/proc/1/exe' - argv0: the path of the program itself, let it pass even with worst case scene: no procfs and no /dev/zero Suggested-by: Willy Tarreau <w@1wt.eu> Link: https://lore.kernel.org/lkml/20230702193306.GK16233@1wt.eu/ Suggested-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://lore.kernel.org/lkml/bff82ea6-610b-4471-a28b-6c76c28604a6@t-8ch.de/ Signed-off-by: Zhangjin Wu <falcon@tinylab.org> Signed-off-by: Willy Tarreau <w@1wt.eu>
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.