Xi Wang 8eee539dde arm64: bpf: fix out-of-bounds read in bpf2a64_offset() ... Problems occur when bpf_to or bpf_from has value prog->len - 1 (e.g., "Very long jump backwards" in test_bpf where the last instruction is a jump): since ctx->offset has length prog->len, ctx->offset[bpf_to + 1] or ctx->offset[bpf_from + 1] will cause an out-of-bounds read, leading to a bogus jump offset and kernel panic. This patch moves updating ctx->offset to after calling build_insn(), and changes indexing to use bpf_to and bpf_from without + 1. Fixes: e54bcde3d6 ("arm64: eBPF JIT compiler") Cc: <stable@vger.kernel.org> # 3.18+ Cc: Zi Shen Lim <zlim.lnx@gmail.com> Cc: Will Deacon <will.deacon@arm.com> Acked-by: Alexei Starovoitov <ast@plumgrid.com> Signed-off-by: Xi Wang <xi.wang@gmail.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2015-06-25 14:50:43 +01:00
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bpf_jit_comp.c	arm64: bpf: fix out-of-bounds read in bpf2a64_offset()	2015-06-25 14:50:43 +01:00
bpf_jit.h	arm64: bpf: add 'shift by register' instructions	2014-10-20 17:47:03 +01:00
Makefile	arm64: eBPF JIT compiler	2014-09-08 14:39:21 +01:00