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To track stack depth of classic bpf programs we only need to analyze ST|STX instructions, since check_load_and_stores() verifies that programs can load from stack only after write. We also need to change the way cBPF stack slots map to eBPF stack, since typical classic programs are using slots 0 and 1, so they need to map to stack offsets -4 and -8 respectively in order to take advantage of small stack interpreter and JITs. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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.