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authorZi Shen Lim <zlim.lnx@gmail.com>2015-11-03 22:56:44 -0800
committerCatalin Marinas <catalin.marinas@arm.com>2015-11-06 16:58:36 +0000
commit251599e1d6906621f49218d7b474ddd159e58f3b (patch)
tree084a03813a419e5abcddf38524ba101255980f5f /arch/arm64/net/bpf_jit.h
parentarm64: Enable CRYPTO_CRC32_ARM64 in defconfig (diff)
downloadlinux-dev-251599e1d6906621f49218d7b474ddd159e58f3b.tar.xz
linux-dev-251599e1d6906621f49218d7b474ddd159e58f3b.zip
arm64: bpf: fix div-by-zero case
In the case of division by zero in a BPF program: A = A / X; (X == 0) the expected behavior is to terminate with return value 0. This is confirmed by the test case introduced in commit 86bf1721b226 ("test_bpf: add tests checking that JIT/interpreter sets A and X to 0."). Reported-by: Yang Shi <yang.shi@linaro.org> Tested-by: Yang Shi <yang.shi@linaro.org> CC: Xi Wang <xi.wang@gmail.com> CC: Alexei Starovoitov <ast@plumgrid.com> CC: linux-arm-kernel@lists.infradead.org CC: linux-kernel@vger.kernel.org Fixes: e54bcde3d69d ("arm64: eBPF JIT compiler") Cc: <stable@vger.kernel.org> # 3.18+ Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/net/bpf_jit.h')
-rw-r--r--arch/arm64/net/bpf_jit.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/arm64/net/bpf_jit.h b/arch/arm64/net/bpf_jit.h
index 98a26ce82d26..aee5637ea436 100644
--- a/arch/arm64/net/bpf_jit.h
+++ b/arch/arm64/net/bpf_jit.h
@@ -1,7 +1,7 @@
/*
* BPF JIT compiler for ARM64
*
- * Copyright (C) 2014 Zi Shen Lim <zlim.lnx@gmail.com>
+ * Copyright (C) 2014-2015 Zi Shen Lim <zlim.lnx@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -35,6 +35,7 @@
aarch64_insn_gen_comp_branch_imm(0, offset, Rt, A64_VARIANT(sf), \
AARCH64_INSN_BRANCH_COMP_##type)
#define A64_CBZ(sf, Rt, imm19) A64_COMP_BRANCH(sf, Rt, (imm19) << 2, ZERO)
+#define A64_CBNZ(sf, Rt, imm19) A64_COMP_BRANCH(sf, Rt, (imm19) << 2, NONZERO)
/* Conditional branch (immediate) */
#define A64_COND_BRANCH(cond, offset) \