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=1794446893; b=GOGx1NtxJdPFLCLarOqkwu+usyEJsopXcNPHuNw0ffO76BReU9j3bhNQCnjG4nXKl7lJ tc5sImlMMWHOtGj5BLqSzA04+YrNrc/48CwtBySgPzHYQXcDFXJSbEsABBFKDiWgIVRDz EmevxoEY0ziZho4I/tSyl8P/484SG+sdsHMV2LuEeDpdi71yjz6Ysa8QPulOtQPeXfM5F 6WtvB2cb6iyp8i5ezgpKpZORdsJk6twXSFBH3nKsfJNBqKpGMdEnClUBL194NAlDgny1E /rW/gVHmSLV4BRkSrcaO82q1j1ULjhVuKndCaJvjGdXpHGS5EjCWW5+zxO00kCJSpaA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794446893; 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=rWWW59Q/ezlTNLCcJslwzdBdYcLA3PiSzf5gryNJ8hM=; b=GwhPhSoBMOAX68RX4xldABT+igBvTI/LhC1+KORf21y3dosljJYJsMVXkn8SJXiTcaax KL7NcN/tJ36DpqtY+Yfatb/SVqlDV7EMxSydsTHnS/6nvzxAlLJrWGkzgsE8IugFLp5Sz caBFHVdoIveri+7yPyZhz7kIc4vWSinv8moM+ovx2fq8AmctFAt+C3b/xT+W8YviS2rRj Q0KU6VUfryz6dn03mXVuOWVB6l8BrkgBokriurWyyFZGRXhLM/zQCEMePuMl9K+htrhMk F1MJsMphR9HlffS63HxWr0KHJ6l9ckfztFBJ47lyKDxpH3GvG7AVWnlVR7UPAWUEq0g== 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=FYG33QPd; 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 7F907606A31C; Thu, 12 Nov 2026 01:28:13 +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=FYG33QPd Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2E2111F00A05; Thu, 12 Nov 2026 01:28:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794446893; bh=rWWW59Q/ezlTNLCcJslwzdBdYcLA3PiSzf5gryNJ8hM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=FYG33QPdMkpvypdKUkWrflaPpCnOqw+eV0WlGVAHKLCl+FwV8vgJz9d3D7D5fa83I s4OriUtGXH21UGHsLHrJEBX8C2Y2xD3JtQaxUN3SAYxvmx6SjqCgV/D65pae0Tb5R+ R1FkVBUJAptFmkIOtpIytmHmjWM2wyTCpDfzMN9sy6g3cV8hlKVbgcGQFGSTv39Lc9 Uuzb3QChfkqYwWArvzDhl1r8OBHlVVoxZx17YEMhpBbBBCgUE+yBX8CY6upHmQlPYw shA7IqOY+4pcVioooaVbat2lFBoMXjJ+6gR6E1QRH1lye/OXqeiQP2ZJb9CkVWGuVc QR+Q5m3d07jYw== 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 v2 10/13] tracing/probes: Allow symstr type for function entry arguments in return probes Date: Thu, 12 Nov 2026 10:28:09 +0900 Message-ID: <179444688986.345731.2259328518477342348.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <179444679892.345731.5271591537517106679.stgit@devnote2> References: <179444679892.345731.5271591537517106679.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 9be546f12053..f0837db354a9 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -1959,7 +1959,8 @@ 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;