From: Alexei Starovoitov <a...@plumgrid.com> Date: Mon, 25 Aug 2014 18:00:53 -0700
> add BPF_LD_IMM64 instruction to load 64-bit immediate value into a register. I think you need to rethink this. I understand that you want to be able to compile arbitrary C code into eBPF, but you have to restrict strongly what data the eBPF code can get to. Arbitrary pointer loads is asking for trouble. Instead I would rather you look into a model like what the quake engine uses for it's VM. Namely, the program can do loads and stores from/to a data section, but all of them are validated to be in the range of the VM program's image. eBPF programs should only be able to access things using either: 1) Well defined entry/exit points for control transfer 2) Load/Store within a private limited data segment range used only by the eBPF program I don't want the eBPF program to be able to get "out of it's box" in any way shape or form. And besides, you're only making this thing as an optimization right? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
