From nobody Mon Oct 6 19:06:22 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5DC722D8387; Fri, 18 Jul 2025 11:34:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752838475; cv=none; b=PIQrlrqNADdQOMJEf9wTIT7WoSnk1WZ0bGHlD2DxTX0mD9osUOlxqAniZLr9nT3hLzvwC7H2apQAvyuZ5THlYUnVuv/FEJLpQmrJUp+G6ao1cNIZeGi6yxfxsnaYyEflkSSIaOQNTlzoXDiGsSDzXN2CywRhi4xCxSSrFcKab6U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752838475; c=relaxed/simple; bh=E2lm3aHfVHYQJcOBR7OBP3UW7aulka1N/K5QYP8yvDg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=nADgAqwhXDDYlppCm1EYduCAbpCkKR7/44nPZsTn89z/YMPQ/F5hLqxGN9yhUciuL4+gdxY6pTTPPyy82ab6QqcK7uulOVXnh20lCm9CknK8c4/TUPBkGZ66sNRdZcAXrP0RMQqKxvCVczfUEcTntJlWgvXOZxl/CXve6lmGgn4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Xr+jbLBZ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Xr+jbLBZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A445C4CEEB; Fri, 18 Jul 2025 11:34:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1752838475; bh=E2lm3aHfVHYQJcOBR7OBP3UW7aulka1N/K5QYP8yvDg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Xr+jbLBZhIRHDzUJi3m/Vt8b39qxBCbbTcWpAwiKboRfAVbVg//fKETig0wCRnzCL 9mYCxj45jIDICgtliairx7wijvyI2iGtZJYWzb+J3tyyVvYiBRCGkvMPvsfwL3cGS4 CAf8B9YsJP8+rex6xhmIRdJKWWfXQJdfTgKgBC0stzusmcjiKyfNFzOAy30K99ci00 9BXdkZtf+KIHdaB2suancU3FX6uqZFHXwXkkBPV+BoXj4WwRwExjgJML7WQIgdpTg6 mYd1AS/Hw4BOgs11RGkemX4bIKnEgWmNmqX6zKwZz9WcEag8tw1r+F6kRei1hEnd3s XhRa6nPWrdz2w== 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 3/5] tracing: kprobe-event: Allocate string buffers from heap Date: Fri, 18 Jul 2025 20:34:29 +0900 Message-ID: <175283846936.343578.3747359008449354291.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <175283843771.343578.8524137568048302760.stgit@devnote2> References: <175283843771.343578.8524137568048302760.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Masami Hiramatsu (Google) Allocate temporary string buffers for parsing kprobe-events from heap instead of stack. Signed-off-by: Masami Hiramatsu (Google) Reviewed-by: Steven Rostedt (Google) --- kernel/trace/trace_kprobe.c | 39 +++++++++++++++++++++++++-------------- 1 file changed, 25 insertions(+), 14 deletions(-) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 15d7a381a128..793af6000f16 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -861,20 +861,20 @@ static int trace_kprobe_create_internal(int argc, con= st char *argv[], * FETCHARG:TYPE : use TYPE instead of unsigned long. */ struct trace_kprobe *tk __free(free_trace_kprobe) =3D NULL; + const char *event =3D NULL, *group =3D KPROBE_EVENT_SYSTEM; + const char **new_argv __free(kfree) =3D NULL; int i, len, new_argc =3D 0, ret =3D 0; - bool is_return =3D false; char *symbol __free(kfree) =3D NULL; - char *tmp =3D NULL; - const char **new_argv __free(kfree) =3D NULL; - const char *event =3D NULL, *group =3D KPROBE_EVENT_SYSTEM; + char *ebuf __free(kfree) =3D NULL; + char *gbuf __free(kfree) =3D NULL; + char *abuf __free(kfree) =3D NULL; + char *dbuf __free(kfree) =3D NULL; enum probe_print_type ptype; + bool is_return =3D false; int maxactive =3D 0; - long offset =3D 0; void *addr =3D NULL; - char buf[MAX_EVENT_NAME_LEN]; - char gbuf[MAX_EVENT_NAME_LEN]; - char abuf[MAX_BTF_ARGS_LEN]; - char *dbuf __free(kfree) =3D NULL; + char *tmp =3D NULL; + long offset =3D 0; =20 switch (argv[0][0]) { case 'r': @@ -893,6 +893,8 @@ static int trace_kprobe_create_internal(int argc, const= char *argv[], event++; =20 if (isdigit(argv[0][1])) { + char *buf __free(kfree) =3D NULL; + if (!is_return) { trace_probe_log_err(1, BAD_MAXACT_TYPE); return -EINVAL; @@ -905,7 +907,7 @@ static int trace_kprobe_create_internal(int argc, const= char *argv[], trace_probe_log_err(1, BAD_MAXACT); return -EINVAL; } - memcpy(buf, &argv[0][1], len); + buf =3D kmemdup(&argv[0][1], len + 1, GFP_KERNEL); buf[len] =3D '\0'; ret =3D kstrtouint(buf, 0, &maxactive); if (ret || !maxactive) { @@ -973,6 +975,9 @@ static int trace_kprobe_create_internal(int argc, const= char *argv[], =20 trace_probe_log_set_index(0); if (event) { + gbuf =3D kmalloc(MAX_EVENT_NAME_LEN, GFP_KERNEL); + if (!gbuf) + return -ENOMEM; ret =3D traceprobe_parse_event_name(&event, &group, gbuf, event - argv[0]); if (ret) @@ -981,16 +986,22 @@ static int trace_kprobe_create_internal(int argc, con= st char *argv[], =20 if (!event) { /* Make a new event name */ + ebuf =3D kmalloc(MAX_EVENT_NAME_LEN, GFP_KERNEL); + if (!ebuf) + return -ENOMEM; if (symbol) - snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_%ld", + snprintf(ebuf, MAX_EVENT_NAME_LEN, "%c_%s_%ld", is_return ? 'r' : 'p', symbol, offset); else - snprintf(buf, MAX_EVENT_NAME_LEN, "%c_0x%p", + snprintf(ebuf, MAX_EVENT_NAME_LEN, "%c_0x%p", is_return ? 'r' : 'p', addr); - sanitize_event_name(buf); - event =3D buf; + sanitize_event_name(ebuf); + event =3D ebuf; } =20 + abuf =3D kmalloc(MAX_BTF_ARGS_LEN, GFP_KERNEL); + if (!abuf) + return -ENOMEM; argc -=3D 2; argv +=3D 2; ctx->funcname =3D symbol; new_argv =3D traceprobe_expand_meta_args(argc, argv, &new_argc,