[PATCH bpf v3] riscv, bpf: Emit fixed-length instructions for BPF_PSEUDO_FUNC

Pu Lehui
2022-12-06T09:13:43Z

From: Pu Lehui <pulehui@huawei.com>

For BPF_PSEUDO_FUNC instruction, verifier will refill imm with
correct addresses of bpf_calls and then run last pass of JIT.
Since the emit_imm of RV64 is variable-length, which will emit
appropriate length instructions accorroding to the imm, it may
broke ctx->offset, and lead to unpredictable problem, such as
inaccurate jump. So let's fix it with fixed-length instructions.

Fixes: 69c087ba6225 ("bpf: Add bpf_for_each_map_elem() helper")
Signed-off-by: Pu Lehui <pulehui@huawei.com>
Suggested-by: Björn Töpel <bjorn@rivosinc.com>
---
arch/riscv/net/bpf_jit_comp64.c | 29 ++++++++++++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index 89744dbd6d86..2f6207b72e12 100644
--- a/arch/riscv/net/bpf_jit_comp64.c
+++ b/arch/riscv/net/bpf_jit_comp64.c
@@ -139,6 +139,25 @@ static bool in_auipc_jalr_range(s64 val)
val < ((1L << 31) - (1L << 11));
}

+/* Emit fixed-length instructions for address */
+static int emit_addr(u8 rd, u64 addr, bool extra_pass, struct rv_jit_context *ctx)
+{
+ u64 ip = (u64)(ctx->insns + ctx->ninsns);
+ s64 off = addr - ip;
+ s64 upper = (off + (1 << 11)) >> 12;
+ s64 lower = off & 0xfff;
+
+ if (extra_pass && !in_auipc_jalr_range(off)) {
+ pr_err("bpf-jit: target offset 0x%llx is out of range\n", off);
+ return -ERANGE;
+ }
+
+ emit(rv_auipc(rd, upper), ctx);
+ emit(rv_addi(rd, rd, lower), ctx);
+ return 0;
+}
+
+/* Emit variable-length instructions for 32-bit and 64-bit imm */
static void emit_imm(u8 rd, s64 val, struct rv_jit_context *ctx)
{
/* Note that the immediate from the add is sign-extended,
@@ -1053,7 +1072,15 @@ int bpf_jit_emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx,
u64 imm64;

imm64 = (u64)insn1.imm << 32 | (u32)imm;
- emit_imm(rd, imm64, ctx);
+ if (bpf_pseudo_func(insn)) {
+ /* fixed-length insns for extra jit pass */
+ ret = emit_addr(rd, imm64, extra_pass, ctx);
+ if (ret)
+ return ret;
+ } else {
+ emit_imm(rd, imm64, ctx);
+ }
+
return 1;
}

--
2.25.1