From patchwork Tue Jan 23 15:02:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 13527563 X-Patchwork-Delegate: mhiramat@kernel.org 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 E97E85FF0B; Tue, 23 Jan 2024 15:02:56 +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=1706022177; cv=none; b=qLuXAcajt4uRIpnSLbXGhzyLHpjdDoU+BNi6DdedgPoIu4D+GXvLmxmJzZwDkoBl8gb+KcrRJLoKn2ocLJ/VeF6SelLK0S1b7P6uVaF5lKAv/r77YqB0M4Dvf7At/A646WLRMRLyLFm4KIJPleIi3di7xGRWO9YEquiup73+s80= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706022177; c=relaxed/simple; bh=zdIHKJVOlplezFr0uz3PNofWQ1uhtB4tw/QWhytbAQk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=FECqxt4h4dwXH5h0aGJhbuldcbaEMQdITipSaOx5YtLledC3z7USF1mgIpQfYZk8/Fdf9VrB3eL2tw36zubBqVIUCVBf6vC/3r9dT06hIyVNcErWc05S6LpWl83H0I6bMnIfU+0uXPZDn9Eyztj7/HLZ0xqzdhEm2IT7QCQSdRw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qWXfw0+m; 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="qWXfw0+m" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AA37FC433C7; Tue, 23 Jan 2024 15:02:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706022176; bh=zdIHKJVOlplezFr0uz3PNofWQ1uhtB4tw/QWhytbAQk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qWXfw0+m789NUxJmtFrZvrkib8DMiUt8NyTKfxFF0Yor0xtJGY7k55Rm1Q/f5DMyn P0RTEYUHv0QVfup33NpQy1wz7KMJ8YcNd8f9q97eq3J5KeEsikQxot0R4WnjBZHUES hTcbfS906sG5fRZNmUpf7OKjKdQNIVdCjt/TeyAE57qmPq+A5VaCOXzR8GePKvA22A +musBmzF1RF2bz3u2tTF6MJXc4QUWhjHmmlpnNyXUUYvyT8KeedkpCIweoOwh4WW88 jALbfw4WghV19lx/EQd9lYDnB0uBRuTKC/nPjWaqBwhV9/HqCWpOrhVpaCUN5p7yT0 gn1A9FtZm6AXg== From: "Masami Hiramatsu (Google)" To: Steven Rostedt Cc: linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] tracing/probes: Fix to show a parse error for bad type for $comm Date: Wed, 24 Jan 2024 00:02:34 +0900 Message-Id: <170602215411.215583.2238016352271091852.stgit@devnote2> X-Mailer: git-send-email 2.34.1 In-Reply-To: <170602214309.215583.16731124846112910621.stgit@devnote2> References: <170602214309.215583.16731124846112910621.stgit@devnote2> User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Masami Hiramatsu (Google) Fix to show a parse error for bad type (non-string) for $comm/$COMM and immediate-string. With this fix, error_log file shows appropriate error message as below. /sys/kernel/tracing # echo 'p vfs_read $comm:u32' >> kprobe_events sh: write error: Invalid argument /sys/kernel/tracing # echo 'p vfs_read \"hoge":u32' >> kprobe_events sh: write error: Invalid argument /sys/kernel/tracing # cat error_log [ 30.144183] trace_kprobe: error: $comm and immediate-string only accepts string type Command: p vfs_read $comm:u32 ^ [ 62.618500] trace_kprobe: error: $comm and immediate-string only accepts string type Command: p vfs_read \"hoge":u32 ^ Fixes: 3dd1f7f24f8c ("tracing: probeevent: Fix to make the type of $comm string") Cc: stable@vger.kernel.org Signed-off-by: Masami Hiramatsu (Google) --- kernel/trace/trace_probe.c | 7 +++++-- kernel/trace/trace_probe.h | 3 ++- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index 4dc74d73fc1d..c6da5923e5b9 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -1159,9 +1159,12 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size, if (!(ctx->flags & TPARG_FL_TEVENT) && (strcmp(arg, "$comm") == 0 || strcmp(arg, "$COMM") == 0 || strncmp(arg, "\\\"", 2) == 0)) { - /* The type of $comm must be "string", and not an array. */ - if (parg->count || (t && strcmp(t, "string"))) + /* The type of $comm must be "string", and not an array type. */ + if (parg->count || (t && strcmp(t, "string"))) { + trace_probe_log_err(ctx->offset + (t ? (t - arg) : 0), + NEED_STRING_TYPE); goto out; + } parg->type = find_fetch_type("string", ctx->flags); } else parg->type = find_fetch_type(t, ctx->flags); diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h index 850d9ecb6765..c1877d018269 100644 --- a/kernel/trace/trace_probe.h +++ b/kernel/trace/trace_probe.h @@ -515,7 +515,8 @@ extern int traceprobe_define_arg_fields(struct trace_event_call *event_call, C(BAD_HYPHEN, "Failed to parse single hyphen. Forgot '>'?"), \ C(NO_BTF_FIELD, "This field is not found."), \ C(BAD_BTF_TID, "Failed to get BTF type info."),\ - C(BAD_TYPE4STR, "This type does not fit for string."), + C(BAD_TYPE4STR, "This type does not fit for string."),\ + C(NEED_STRING_TYPE, "$comm and immediate-string only accepts string type"), #undef C #define C(a, b) TP_ERR_##a