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bpf, arm: start flushing icache range from header

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During review I noticed that the icache range we're flushing should
start at header already and not at ctx.image.

Reason is that after 55309dd3d4 ("net: bpf: arm: address randomize
and write protect JIT code"), we also want to make sure to flush the
random-sized trap in front of the start of the actual program (analogous
to x86). No operational differences from user side.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Nicolas Schichan <nschichan@freebox.fr>
Cc: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2015-11-14 01:26:53 +01:00 committed by David S. Miller
parent 30b50aa612
commit ebaef649c2
1 changed files with 1 additions and 1 deletions
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2
arch/arm/net/bpf_jit_32.c
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@ -1061,7 +1061,7 @@ void bpf_jit_compile(struct bpf_prog *fp)
}
build_epilogue(&ctx);
flush_icache_range((u32)ctx.target, (u32)(ctx.target + ctx.idx));
flush_icache_range((u32)header, (u32)(ctx.target + ctx.idx));
#if __LINUX_ARM_ARCH__ < 7
if (ctx.imm_count)