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| author | Xu Kuohai <xukuohai@huawei.com> | 2023-08-15 11:41:56 -0400 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2023-08-18 15:46:18 +0200 |
| commit | c32b6ee514d26dc6c40c45984e534b2d87fba917 (patch) | |
| tree | c1b3b5c2d76834c7c396a609eadf88aedfb30ecd /arch/arm64 | |
| parent | 1104247f3f97916f0afc29b73112c97affbfdbd2 (diff) | |
| download | linux-stable-c32b6ee514d26dc6c40c45984e534b2d87fba917.tar.gz linux-stable-c32b6ee514d26dc6c40c45984e534b2d87fba917.tar.bz2 linux-stable-c32b6ee514d26dc6c40c45984e534b2d87fba917.zip | |
bpf, arm64: Support 32-bit offset jmp instruction
Add support for 32-bit offset jmp instructions. Given the arm64 direct jump
range is +-128MB, which is large enough for BPF prog, jumps beyond this range
are not supported.
Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Florent Revest <revest@chromium.org>
Acked-by: Florent Revest <revest@chromium.org>
Link: https://lore.kernel.org/bpf/20230815154158.717901-6-xukuohai@huaweicloud.com
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/net/bpf_jit_comp.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index 1d35acb880dc..924b8ef2e46a 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -982,7 +982,11 @@ emit_bswap_uxt: /* JUMP off */ case BPF_JMP | BPF_JA: - jmp_offset = bpf2a64_offset(i, off, ctx); + case BPF_JMP32 | BPF_JA: + if (BPF_CLASS(code) == BPF_JMP) + jmp_offset = bpf2a64_offset(i, off, ctx); + else + jmp_offset = bpf2a64_offset(i, imm, ctx); check_imm26(jmp_offset); emit(A64_B(jmp_offset), ctx); break; |