From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from fanzine2.igalia.com (fanzine2.igalia.com [213.97.179.56]) (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 4B43C4A2E38; Thu, 27 Aug 2026 18:23:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.97.179.56 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787855039; cv=none; b=sK9kS+V9+jQ+hfCDXNA6s1TS3Dt/Y+bSIHCsqqB1/RML43awEKnfNNQztYr0yj8aEM07hXqi6PTwyHqivw1cuZtIoxN09AcjUCnpGSNBQ5pdOvcih5la8EaXRy0/5T2GYHlvz9lw3yZw5o2tHFiQgNYbJCIkOCuAoeLw0SBnRnE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787855039; c=relaxed/simple; bh=L8GFgeb7a4QvDHRlarPZrP1u0QMO5BCN0lo1AJVJcSc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=iU6qLzTEaU35IVYHp7GT4vouV6SX6pqCduomVYJKjZmE4ta7n0ciKdbMVvgQpXa5Ju9MYSJI3cz5HfqEFPGzqRsOhWulmq8+A6ZKCufIVGhvgW2vJ0cpUelHJ2QpZc8H8Xba9ompU7E4n9Teb8N4rwMW0cK/fYd/9WIN9obCNMk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com; spf=pass smtp.mailfrom=igalia.com; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b=oLFQXfLA; arc=none smtp.client-ip=213.97.179.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=igalia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b="oLFQXfLA" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Cc:To:Message-Id:Content-Transfer-Encoding:Content-Type: MIME-Version:Subject:Date:From:From:Reply-To; bh=RXqZsmU2q6vi2HhgyJCccmn6k7A/eS01jTDJneNS7NY=; b=oLFQXfLAwpus3wRWgG1Md03M9j 0c4lE9YuawfHYRGb/ucAqRnVoxg4puOyN4BkF4bqa0QsZR3ChgvTtuqS4k7/mGVjEJfLzu+GzbH2V 8W0PRr4rQfVpq/tRQ42dLa04sjqPeUeo0+QsTVHWYbN2o1tKn64UDbkiBWkvU2M87mvRUNbgRgKKH paj0emLYvPzetoCTOVNypuqMJL5Hi7JoCiKZBMQxtt4GOBibHFp3Yyb53Hb9HTQfq8rNz/dKL1oJp Pz5oc9gVhGpHJpyapPXQKr8FxVsgfTt/WPwBzwba0WtyU2nVUzC9bmeVKIjNExYdFwc0eZR3YjQGu OuDUTE+g==; Received: from [187.57.78.212] (helo=[192.168.15.100]) by fanzine2.igalia.com with esmtpsa (Cipher TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim) id 1wzelR-00AOUg-Cp; Thu, 27 Aug 2026 20:23:49 +0200 From: =?utf-8?q?Andr=C3=A9_Almeida?= Date: Thu, 27 Aug 2026 15:23:05 -0300 Subject: [PATCH v5 6/6] selftests: prctl: Add test for long thread names Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20260827-tonyk-long_name-v5-6-5fa843782a00@igalia.com> References: <20260827-tonyk-long_name-v5-0-5fa843782a00@igalia.com> In-Reply-To: <20260827-tonyk-long_name-v5-0-5fa843782a00@igalia.com> To: Peter Zijlstra , Juri Lelli , Vincent Guittot , Steven Rostedt , Christian Brauner , Kees Cook , Shuah Khan , willy@infradead.org, mathieu.desnoyers@efficios.com, David Laight , Linus Torvalds , akpm@linux-foundation.org, Yafang Shao , andrii.nakryiko@gmail.com, arnaldo.melo@gmail.com, Petr Mladek Cc: linux-kernel@vger.kernel.org, kernel-dev@igalia.com, linux-mm@kvack.org, linux-api@vger.kernel.org, linux-trace-kernel@vger.kernel.org, =?utf-8?q?Andr=C3=A9_Almeida?= X-Mailer: b4 0.15.2 Add tests for the new interface to set and get long thread names. The kernel should accept the LONG_NAME and returning it accordingly. For the old PR_GET_NAME interface, the kernel should truncate the name up to 16 chars. /proc//comm should return the same string ad PR_GET_NAME. Signed-off-by: André Almeida --- tools/testing/selftests/prctl/set-process-name.c | 37 ++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/tools/testing/selftests/prctl/set-process-name.c b/tools/testing/selftests/prctl/set-process-name.c index 3f7b146d36df..951319d60656 100644 --- a/tools/testing/selftests/prctl/set-process-name.c +++ b/tools/testing/selftests/prctl/set-process-name.c @@ -9,9 +9,17 @@ #include "kselftest_harness.h" +#ifndef PR_SET_EXT_NAME +# define PR_SET_EXT_NAME 17 +# define PR_GET_EXT_NAME 18 +#endif + #define CHANGE_NAME "changename" +#define LONG_NAME "change_to_very_long_extended_name" +#define LONG_NAME_CAP "change_to_very_" #define EMPTY_NAME "" #define TASK_COMM_LEN 16 +#define TASK_COMM_EXT_LEN 64 #define MAX_PATH_LEN 50 int set_name(char *name) @@ -25,6 +33,17 @@ int set_name(char *name) return res; } +int set_ext_name(char *name) +{ + int res; + + res = prctl(PR_SET_EXT_NAME, name, NULL, NULL, NULL); + + if (res < 0) + return -errno; + return res; +} + int check_is_name_correct(char *check_name) { char name[TASK_COMM_LEN]; @@ -38,6 +57,19 @@ int check_is_name_correct(char *check_name) return !strcmp(name, check_name); } +int check_is_ext_name_correct(char *check_name) +{ + char name[TASK_COMM_EXT_LEN]; + int res; + + res = prctl(PR_GET_EXT_NAME, name, NULL, NULL, NULL); + + if (res < 0) + return -errno; + + return !strcmp(name, check_name); +} + int check_null_pointer(char *check_name) { char *name = NULL; @@ -82,6 +114,11 @@ TEST(rename_process) { EXPECT_GE(set_name(CHANGE_NAME), 0); EXPECT_TRUE(check_is_name_correct(CHANGE_NAME)); + EXPECT_GE(set_ext_name(LONG_NAME), 0); + EXPECT_TRUE(check_is_ext_name_correct(LONG_NAME)); + EXPECT_TRUE(check_is_name_correct(LONG_NAME_CAP)); + EXPECT_TRUE(check_name()); + EXPECT_GE(set_name(EMPTY_NAME), 0); EXPECT_TRUE(check_is_name_correct(EMPTY_NAME)); -- 2.55.0