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| author |   Daniel Borkmann <daniel@iogearbox.net> | 2015-11-14 01:16:18 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-11-16 14:41:30 -0500 |
| commit | c3d4c682c240595c3637c552dc1afa985bc6d382 (patch) | |
| tree | ce5cba420f360ac90831883ff7deba5b0093bfe8 /arch | |
| parent | bpf, arm: start flushing icache range from header (diff) | |
| download | linux-dev-c3d4c682c240595c3637c552dc1afa985bc6d382.tar.xz linux-dev-c3d4c682c240595c3637c552dc1afa985bc6d382.zip | |
bpf, arm64: start flushing icache range from header
While recently going over ARM64's BPF code, I noticed that the icache
range we're flushing should start at header already and not at ctx.image.
Reason is that after b569c1c622c5 ("net: bpf: arm64: 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>
Acked-by: Zi Shen Lim <zlim.lnx@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/net/bpf_jit_comp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index ac8b548ce493..64a8bc12f4a2 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -740,7 +740,7 @@ void bpf_int_jit_compile(struct bpf_prog *prog) if (bpf_jit_enable > 1) bpf_jit_dump(prog->len, image_size, 2, ctx.image); - bpf_flush_icache(ctx.image, ctx.image + ctx.idx); + bpf_flush_icache(header, ctx.image + ctx.idx); set_memory_ro((unsigned long)header, header->pages); prog->bpf_func = (void *)ctx.image; |