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| author | Daniel Borkmann <daniel@iogearbox.net> | 2021-09-13 18:35:34 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-22 11:47:58 +0200 |
| commit | 91cdb5b36234e6af69d6280f1510e4453707a2b8 (patch) | |
| tree | 16765ff02b426d1b7039f0256c4b8dad3747a07c /arch/sparc | |
| parent | fc578c64398df4f93fd7a6143e218281cc7c4348 (diff) | |
| download | linux-stable-91cdb5b36234e6af69d6280f1510e4453707a2b8.tar.gz linux-stable-91cdb5b36234e6af69d6280f1510e4453707a2b8.tar.bz2 linux-stable-91cdb5b36234e6af69d6280f1510e4453707a2b8.zip | |
bpf: Introduce BPF nospec instruction for mitigating Spectre v4
commit f5e81d1117501546b7be050c5fbafa6efd2c722c upstream.
In case of JITs, each of the JIT backends compiles the BPF nospec instruction
/either/ to a machine instruction which emits a speculation barrier /or/ to
/no/ machine instruction in case the underlying architecture is not affected
by Speculative Store Bypass or has different mitigations in place already.
This covers both x86 and (implicitly) arm64: In case of x86, we use 'lfence'
instruction for mitigation. In case of arm64, we rely on the firmware mitigation
as controlled via the ssbd kernel parameter. Whenever the mitigation is enabled,
it works for all of the kernel code with no need to provide any additional
instructions here (hence only comment in arm64 JIT). Other archs can follow
as needed. The BPF nospec instruction is specifically targeting Spectre v4
since i) we don't use a serialization barrier for the Spectre v1 case, and
ii) mitigation instructions for v1 and v4 might be different on some archs.
The BPF nospec is required for a future commit, where the BPF verifier does
annotate intermediate BPF programs with speculation barriers.
Co-developed-by: Piotr Krysiuk <piotras@gmail.com>
Co-developed-by: Benedict Schlueter <benedict.schlueter@rub.de>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Piotr Krysiuk <piotras@gmail.com>
Signed-off-by: Benedict Schlueter <benedict.schlueter@rub.de>
Acked-by: Alexei Starovoitov <ast@kernel.org>
[OP: adjusted context for 4.19, drop riscv and ppc32 changes]
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/net/bpf_jit_comp_64.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/sparc/net/bpf_jit_comp_64.c b/arch/sparc/net/bpf_jit_comp_64.c index ec4da4dc98f1..1bb1e64d4377 100644 --- a/arch/sparc/net/bpf_jit_comp_64.c +++ b/arch/sparc/net/bpf_jit_comp_64.c @@ -1261,6 +1261,9 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx) emit(opcode | RS1(src) | rs2 | RD(dst), ctx); break; } + /* speculation barrier */ + case BPF_ST | BPF_NOSPEC: + break; /* ST: *(size *)(dst + off) = imm */ case BPF_ST | BPF_MEM | BPF_W: case BPF_ST | BPF_MEM | BPF_H: |