From nobody Wed Dec 17 20:59:23 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DBC99C61D9C for ; Wed, 22 Nov 2023 23:21:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344333AbjKVXVj (ORCPT ); Wed, 22 Nov 2023 18:21:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58344 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229576AbjKVXVc (ORCPT ); Wed, 22 Nov 2023 18:21:32 -0500 Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4AD8C199; Wed, 22 Nov 2023 15:21:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1700695286; bh=+wwLWsOzUhO5DcZAPO5W8gHxG/+RvPZMOuDOlIqHikY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=mj3VfFIzMYATJNncnNxf7lCtyL3K6dQoyS9Lbp0oFSdDotwX8gFxppwzH5tB39izR 7KVuXn1tTQLfyQxb2d8h9IgqbnSjjxUB+fv2JK2aQw0BgqyWviBJEqNbp9pM5Ndl5i bbZwcEag6OyEdWBkuZ7XPorboZ5kLmF2XcNlaVYc= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Thu, 23 Nov 2023 00:21:26 +0100 Subject: [PATCH 2/3] tools/nolibc: add support for getrlimit/setrlimit MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20231123-nolibc-rlimit-v1-2-a428b131de2a@weissschuh.net> References: <20231123-nolibc-rlimit-v1-0-a428b131de2a@weissschuh.net> In-Reply-To: <20231123-nolibc-rlimit-v1-0-a428b131de2a@weissschuh.net> To: Willy Tarreau , Shuah Khan Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=ed25519-sha256; t=1700695285; l=3555; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=+wwLWsOzUhO5DcZAPO5W8gHxG/+RvPZMOuDOlIqHikY=; b=7MH+fFec8xzEZGptGCONnSZDtxVsM+HH4V2Xb+pgNVsICmD0Q+KtMr6Ifj3FNt2kIOQmsu8G0 pjNx/wPYoAiDwH6zFsR6eS08MvGJmNRAl0Bokd1kUCjwBTX07S46Hh8 X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The implementation uses the prlimit64 systemcall as that is available on all architectures. Signed-off-by: Thomas Wei=C3=9Fschuh --- tools/include/nolibc/sys.h | 38 ++++++++++++++++++++++++= ++++ tools/testing/selftests/nolibc/nolibc-test.c | 29 +++++++++++++++++++++ 2 files changed, 67 insertions(+) diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h index 2f359cb03d10..dda9dffd1d74 100644 --- a/tools/include/nolibc/sys.h +++ b/tools/include/nolibc/sys.h @@ -21,6 +21,7 @@ #include /* for O_* and AT_* */ #include /* for statx() */ #include +#include =20 #include "arch.h" #include "errno.h" @@ -898,6 +899,43 @@ int reboot(int cmd) } =20 =20 +/* + * int getrlimit(int resource, struct rlimit *rlim); + * int setrlimit(int resource, const struct rlimit *rlim); + */ + +static __attribute__((unused)) +int sys_prlimit64(pid_t pid, int resource, + const struct rlimit64 *new_limit, struct rlimit64 *old_limit) +{ + return my_syscall4(__NR_prlimit64, pid, resource, new_limit, old_limit); +} + +static __attribute__((unused)) +int getrlimit(int resource, struct rlimit *rlim) +{ + struct rlimit64 rlim64; + int ret; + + ret =3D __sysret(sys_prlimit64(0, resource, NULL, &rlim64)); + rlim->rlim_cur =3D rlim64.rlim_cur; + rlim->rlim_max =3D rlim64.rlim_max; + + return ret; +} + +static __attribute__((unused)) +int setrlimit(int resource, const struct rlimit *rlim) +{ + struct rlimit64 rlim64 =3D { + .rlim_cur =3D rlim->rlim_cur, + .rlim_max =3D rlim->rlim_max, + }; + + return __sysret(sys_prlimit64(0, resource, &rlim64, NULL)); +} + + /* * int sched_yield(void); */ diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/s= elftests/nolibc/nolibc-test.c index 2b71fb5fae4e..d07cebace107 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -839,6 +840,33 @@ int test_pipe(void) return !!memcmp(buf, msg, len); } =20 +int test_rlimit(void) +{ + struct rlimit rlim =3D { + .rlim_cur =3D 1 << 20, + .rlim_max =3D 1 << 20, + }; + int ret; + + ret =3D setrlimit(RLIMIT_CORE, &rlim); + if (ret) + return -1; + + rlim.rlim_cur =3D 0; + rlim.rlim_max =3D 0; + + ret =3D getrlimit(RLIMIT_CORE, &rlim); + if (ret) + return -1; + + if (rlim.rlim_cur !=3D 1 << 20) + return -1; + if (rlim.rlim_max !=3D 1 << 20) + return -1; + + return 0; +} + =20 /* Run syscall tests between IDs and . * Return 0 on success, non-zero on failure. @@ -929,6 +957,7 @@ int run_syscall(int min, int max) CASE_TEST(poll_fault); EXPECT_SYSER(1, poll(NULL, 1, 0), -1, EFAU= LT); break; CASE_TEST(prctl); EXPECT_SYSER(1, prctl(PR_SET_NAME, (unsign= ed long)NULL, 0, 0, 0), -1, EFAULT); break; CASE_TEST(read_badf); EXPECT_SYSER(1, read(-1, &tmp, 1), -1, EBA= DF); break; + CASE_TEST(rlimit); EXPECT_SYSZR(1, test_rlimit()); break; CASE_TEST(rmdir_blah); EXPECT_SYSER(1, rmdir("/blah"), -1, ENOENT= ); break; CASE_TEST(sched_yield); EXPECT_SYSZR(1, sched_yield()); break; CASE_TEST(select_null); EXPECT_SYSZR(1, ({ struct timeval tv =3D {= 0 }; select(0, NULL, NULL, NULL, &tv); })); break; --=20 2.43.0