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fc152d22d6
In the current form of the code, if a->replacementlen is 0, the reference to *insnbuf for comparison touches potentially garbage memory. While it doesn't affect the execution flow due to the subsequent a->replacementlen comparison, it is (rightly) detected as use of uninitialized memory by a runtime instrumentation currently under my development, and could be detected as such by other tools in the future, too (e.g. KMSAN). Fix the "false-positive" by reordering the conditions to first check the replacement instruction length before referencing specific opcode bytes. Signed-off-by: Mateusz Jurczyk <mjurczyk@google.com> Reviewed-by: Borislav Petkov <bp@suse.de> Cc: Andy Lutomirski <luto@kernel.org> Link: http://lkml.kernel.org/r/20170524135500.27223-1-mjurczyk@google.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.