From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794558574; b=0yLpCk9CREOtDGk/MyndZmTbhvWSbjFFAg5HoIIlUJ826lZTlcjrDwuOfFqMY8gUhJi3 fxPy+cYE6LgXWQkbvTs+xJ9cUPoJbLhB1Bx9RQ7ijshDJFF/ZG4L4kZ20Xaj5RezNI5P1 8ElkwLbwTInjsmTXeDmOkdxO+GyvQTQxp9vv4iq0//ZoTp7feNBOR7TrukD+QXEDhdrcV hXCNZac1msBfmrs5SLoz1NfF7UqEdlurNefbVoSDv8p8ROKigLx5hAa9cc6se0+b+c6Bb mXpUcuXwVYAtVnX/KK1GWi9zYcVoyfriNrgC1522iu4MNk4D8hLlZR8+ynaLOvQ2vZA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794558574; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:MIME-Version:Content-Type: Content-Transfer-Encoding; bh=EF5DIfZ9Y99pubZVtfC2+MQ5VunckKy102q1PdbbPEM=; b=Ll92ujlTRQ4JWh9/twJWgwmXRWQ2Fl7oD3OGEzPyE+v6Ip9UlHlhINoCMK0JusDOd6WE kPImqkEb1DSUdEgr3f6vlhOBaz2KDGJiSyp3ZThwA3O8Zr5Xk81abVOtZgCQLkEqaoE19 qcDTGSiQyHlrZ52WbSnw6RAVDzTc6Z9oqVcsIoVFkMGpBRsOanxYTuHR2e84kcqfRx3li uyhQ9VrozhjIVkxdHhrJo64wKt1awUloRGQjKG6r2HGUN3z3s/yi9nBC97VyyWIyYiy2H x/aogq/Pbs0tBTxBU/UQtvD3Sdp4jFnsrdAiYFaNf9Z2BeWUJ9uKtO2U660u3oMopaQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=cVsmWEJE; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BB98960A3830; Fri, 13 Nov 2026 08:29:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=cVsmWEJE Received: by smtp.kernel.org (Postfix) with ESMTPSA id 277981F000C4; Fri, 13 Nov 2026 08:29:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794558574; bh=EF5DIfZ9Y99pubZVtfC2+MQ5VunckKy102q1PdbbPEM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=cVsmWEJEbRBJKo2Kf/mktW8VNak8yNhdwrfUSoki/+l7W9h88RT7ToLqd38YbLCFO CeW7Hqlgy2pz82sklEMr/O3oWp6HBXDX6UGSV/mytFayjquGEaq36Czb8GdG3n5FXQ qO6nMhX3Ajdg+smoZupGi/37/9caUZysNRbKYTD9VdAA5+i5pAWy0mXBfyhsVRYyK3 FiSVtT/twMU54F2j+H9aWZLUYDd3eJzNUJ/idgiBVlS6Nzh+1ILSzQx4WdY5CNM9po tTRxNh0RRdhnBCXoa1S343udDWiUIdx71NeZqFX8W/ENuJehfMs7WxTPYOTosc8vng xWgnF3AJjpVWw== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Masami Hiramatsu Cc: Mathieu Desnoyers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH v3 10/13] tracing/probes: Allow symstr type for function entry arguments in return probes Date: Fri, 13 Nov 2026 17:29:30 +0900 Message-ID: <179455857080.403392.10171666250083335438.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <179455847934.403392.15146485751358774349.stgit@devnote2> References: <179455847934.403392.15146485751358774349.stgit@devnote2> User-Agent: StGit/0.19 X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Masami Hiramatsu (Google) Function entry arguments accessed in return probes ($argN or BTF entry arguments) are fetched from the entry data buffer via FETCH_OP_EDATA, which was omitted from the allowed operations for the "symstr" type and rejected with BAD_SYMSTRING. Allow FETCH_OP_EDATA to be formatted as "symstr". Signed-off-by: Masami Hiramatsu (Google) --- kernel/trace/trace_probe.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index 9c789ca316b7..65dc5c19deae 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -1962,7 +1962,8 @@ static int finalize_fetch_insn(struct fetch_insn *code, if (!strcmp(parg->type->name, "symstr")) { if (code->op != FETCH_OP_REG && code->op != FETCH_OP_STACK && code->op != FETCH_OP_RETVAL && code->op != FETCH_OP_ARG && - code->op != FETCH_OP_DEREF && code->op != FETCH_OP_TP_ARG) { + code->op != FETCH_OP_DEREF && code->op != FETCH_OP_TP_ARG && + code->op != FETCH_OP_EDATA) { trace_probe_log_err(ctx->offset + type_offset, BAD_SYMSTRING); return -EINVAL;