Messages in this thread | | | From | Xi Wang <> | Date | Tue, 3 Nov 2015 23:04:05 -0800 | Subject | Re: [PATCH] arm64: bpf: fix div-by-zero case |
| |
On Tue, Nov 3, 2015 at 10:56 PM, Zi Shen Lim <zlim.lnx@gmail.com> wrote: > case BPF_ALU | BPF_DIV | BPF_X: > case BPF_ALU64 | BPF_DIV | BPF_X: > + { > + const u8 r0 = bpf2a64[BPF_REG_0]; > + > + /* if (src == 0) return 0 */ > + jmp_offset = 3; /* skip ahead to else path */ > + check_imm19(jmp_offset); > + emit(A64_CBNZ(is64, src, jmp_offset), ctx); > + emit(A64_MOVZ(1, r0, 0, 0), ctx); > + jmp_offset = epilogue_offset(ctx); > + check_imm26(jmp_offset); > + emit(A64_B(jmp_offset), ctx); > + /* else */ > emit(A64_UDIV(is64, dst, dst, src), ctx); > break; > + } > case BPF_ALU | BPF_MOD | BPF_X: > case BPF_ALU64 | BPF_MOD | BPF_X:
BPF_MOD might need the same fix.
| |