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| author | David S. Miller <davem@davemloft.net> | 2016-02-01 18:44:07 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-02-01 18:44:07 -0800 |
| commit | b45efa30a626e915192a6c548cd8642379cd47cc (patch) | |
| tree | 90d8b43ebceb850b0e7852d75283aebbd2abbc00 /arch/arm64/net/bpf_jit_comp.c | |
| parent | 7a26019fdecdb45ff784ae4e3b7e0cc9045100ca (diff) | |
| parent | 34229b277480f46c1e9a19f027f30b074512e68b (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'arch/arm64/net/bpf_jit_comp.c')
| -rw-r--r-- | arch/arm64/net/bpf_jit_comp.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index 7658612d915c..a34420a5df9a 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -1,7 +1,7 @@ /* * BPF JIT compiler for ARM64 * - * Copyright (C) 2014-2015 Zi Shen Lim <zlim.lnx@gmail.com> + * Copyright (C) 2014-2016 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 @@ -737,6 +737,20 @@ static int build_body(struct jit_ctx *ctx) return 0; } +static int validate_code(struct jit_ctx *ctx) +{ + int i; + + for (i = 0; i < ctx->idx; i++) { + u32 a64_insn = le32_to_cpu(ctx->image[i]); + + if (a64_insn == AARCH64_BREAK_FAULT) + return -1; + } + + return 0; +} + static inline void bpf_flush_icache(void *start, void *end) { flush_icache_range((unsigned long)start, (unsigned long)end); @@ -799,6 +813,12 @@ void bpf_int_jit_compile(struct bpf_prog *prog) build_epilogue(&ctx); + /* 3. Extra pass to validate JITed code. */ + if (validate_code(&ctx)) { + bpf_jit_binary_free(header); + goto out; + } + /* And we're done. */ if (bpf_jit_enable > 1) bpf_jit_dump(prog->len, image_size, 2, ctx.image); |