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Like other JITs, sparc64 maintains an array of instruction offsets but stores the entries off by one. This is done because jumps to the exit block are indexed to one past the last BPF instruction. So if we size the array by the program length, we need to record the previous instruction in order to stay within the array bounds. This is explained in ARM JIT commit8eee539dde("arm64: bpf: fix out-of-bounds read in bpf2a64_offset()"). But this scheme requires a little bit of careful handling when the instruction before the branch destination is a 64-bit load immediate. It takes up 2 BPF instruction slots. Therefore, we have to fill in the array entry for the second half of the 64-bit load immediate instruction rather than for the one for the beginning of that instruction. Fixes:7a12b5031c("sparc64: Add eBPF JIT.") 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.