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=1794184169; b=Wy1aBMY1qGoNeGDBDObpLYjiRhQ/TjB/p3Fw5wzDi9PhHfasNwhD6XuLRCQdCdAT2oBD kR65Xcsw/Vc2QAwxNyQiK5Q974WLEwdBZHdjDllh+r8poQAgn80zLMFvDxIABROJe/Olu N2MiW5Lcp0A3Z9jsZtya2UVvNzRu0qTZmvzvPeeCqc+yo+AGv+++NmTxgHf0bYRagdufi FkKK6Lc1NgzIVQQe7drPKCHHpa3Q2xiK7v9a72ks9ibFqamoEoSjoxoR+AMDK8PNZp55A jL6dA4Dou4p5XKTHzfbJTttysIheIBJnxvEhorIY4HDELLgL5cNNki/p+6Dcam9IjSA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794184169; 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=e4pl/+urMvjDa/IYNgk59FnORyJQCbarPULwiTBcwE4=; b=JWSyjmVG86etuzkDanEFE2Pbx+6TeJcWtZj6/8YqMgjiDtgXd5PIOtIvIKVZYtd6UcME uJczQVF/SPtx0etSuP9klSHLTkjEc+COSI4jVQpw9ZhxrJ5PszjcpcXP0BAeVqvE20M1H azXq8iI2pVF9A0bHl+/2dtuY8jWmh4gjnduKj1MRv2NKFmp5meRGF16XiY96mRquIQZQd Rl+9cOutPyY4PsMFg8ICXg/pSQp3JYGoIC2Ro3dirQiNQ8IM4GM9V2OUQdIRgI1KS+LNP pkuNhAFMtTX8fPS4dZZmnNhrTuSCNqR2ew9ZlrnmuaJD9uXoBM+mEKil8AIm5zY7qbg== 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=mEpjT74l; 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 26751606A33C; Mon, 9 Nov 2026 00:29:29 +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=mEpjT74l Received: by smtp.kernel.org (Postfix) with ESMTPSA id B03041F008A7; Mon, 9 Nov 2026 00:29:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794184169; bh=e4pl/+urMvjDa/IYNgk59FnORyJQCbarPULwiTBcwE4=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=mEpjT74lS1ozvyjDgD1b3+6mqfk0hqePPxoXPXFUC10IfLaMlgRz/Gc3z7XhYdPaP crMcE2Nr3k+i+6zF2X+1wOlHMuszSAe52krGrBmwFKTQLOC6qsPrcPLc5zEe9dyD4G xk99t+RoioRYI0EeDkcWYGNNM9lK3XHCH6LuU2dqvxelsRQrUpVYqby1j1tZUVZJ8S MsFN6Yhh1K2YjRAqFqjlnB1LXQluCT2D1WWh/wPQZmJF7guDl/AFNCMBo5w7f3soXk WbCqjBl7t3xhLc6qxexfSluxIqd9cEnPyEKl1/EFmSYPbs+8uhsJ7GSoBpf2qo5lv6 3AbOZU30S0fqA== 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 09/12] tracing/probes: Allow symstr type for function entry arguments in return probes Date: Mon, 9 Nov 2026 09:29:25 +0900 Message-ID: <179418416553.227715.17841891129776321634.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <179418408457.227715.1485179201014819821.stgit@devnote2> References: <179418408457.227715.1485179201014819821.stgit@devnote2> User-Agent: StGit/0.19 X-Mailing-List: linux-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 0f544d415153..67453d0121c9 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -1958,7 +1958,8 @@ 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;