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[213.175.37.12]) by smtp.gmail.com with ESMTPSA id by4sm2868404edb.107.2022.02.02.05.53.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Feb 2022 05:53:46 -0800 (PST) From: Jiri Olsa X-Google-Original-From: Jiri Olsa To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Masami Hiramatsu Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, lkml , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Steven Rostedt , Jiri Olsa Subject: [PATCH 2/8] bpf: Add bpf_get_func_ip kprobe helper for fprobe link Date: Wed, 2 Feb 2022 14:53:27 +0100 Message-Id: <20220202135333.190761-3-jolsa@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220202135333.190761-1-jolsa@kernel.org> References: <20220202135333.190761-1-jolsa@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Adding support to call get_func_ip_fprobe helper from kprobe programs attached by fprobe link. Also adding support to inline it, because it's single load instruction. Signed-off-by: Jiri Olsa --- kernel/bpf/verifier.c | 19 ++++++++++++++++++- kernel/trace/bpf_trace.c | 16 +++++++++++++++- 2 files changed, 33 insertions(+), 2 deletions(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 1ae41d0cf96c..a745ded00635 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -13625,7 +13625,7 @@ static int do_misc_fixups(struct bpf_verifier_env *env) continue; } - /* Implement bpf_get_func_ip inline. */ + /* Implement tracing bpf_get_func_ip inline. */ if (prog_type == BPF_PROG_TYPE_TRACING && insn->imm == BPF_FUNC_get_func_ip) { /* Load IP address from ctx - 16 */ @@ -13640,6 +13640,23 @@ static int do_misc_fixups(struct bpf_verifier_env *env) continue; } + /* Implement kprobe/fprobe bpf_get_func_ip inline. */ + if (prog_type == BPF_PROG_TYPE_KPROBE && + eatype == BPF_TRACE_FPROBE && + insn->imm == BPF_FUNC_get_func_ip) { + /* Load IP address from ctx (struct pt_regs) ip */ + insn_buf[0] = BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_1, + offsetof(struct pt_regs, ip)); + + new_prog = bpf_patch_insn_data(env, i + delta, insn_buf, 1); + if (!new_prog) + return -ENOMEM; + + env->prog = prog = new_prog; + insn = new_prog->insnsi + i + delta; + continue; + } + patch_call_imm: fn = env->ops->get_func_proto(insn->imm, env->prog); /* all functions that have prototype and verifier allowed diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index a2024ba32a20..28e59e31e3db 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -1036,6 +1036,19 @@ static const struct bpf_func_proto bpf_get_func_ip_proto_kprobe = { .arg1_type = ARG_PTR_TO_CTX, }; +BPF_CALL_1(bpf_get_func_ip_fprobe, struct pt_regs *, regs) +{ + /* This helper call is inlined by verifier. */ + return regs->ip; +} + +static const struct bpf_func_proto bpf_get_func_ip_proto_fprobe = { + .func = bpf_get_func_ip_fprobe, + .gpl_only = false, + .ret_type = RET_INTEGER, + .arg1_type = ARG_PTR_TO_CTX, +}; + BPF_CALL_1(bpf_get_attach_cookie_trace, void *, ctx) { struct bpf_trace_run_ctx *run_ctx; @@ -1279,7 +1292,8 @@ kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_override_return_proto; #endif case BPF_FUNC_get_func_ip: - return &bpf_get_func_ip_proto_kprobe; + return prog->expected_attach_type == BPF_TRACE_FPROBE ? + &bpf_get_func_ip_proto_fprobe : &bpf_get_func_ip_proto_kprobe; case BPF_FUNC_get_attach_cookie: return &bpf_get_attach_cookie_proto_trace; default: -- 2.34.1