From patchwork Wed Oct 30 02:50:45 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: zhouyuhang X-Patchwork-Id: 13855876 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.5]) by smtp.subspace.kernel.org (Postfix) with ESMTP id DF4D64437; Wed, 30 Oct 2024 02:51:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.5 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730256667; cv=none; b=UDnk2oeCu8igh7lkxy5GWHMDmAf+bficDMOifZW3ZGyis4tTdBobJfXrpweOKZ2yjdlmDru0WcmEopsdgDzSE6bqMBJ5QM1z3aAvVkxnHOGtW0mFpZwQn/+6zejwnItgolOLexo06M9VwGC0PJR7mn4jMggddICcRUIn+sMnxxI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730256667; c=relaxed/simple; bh=9hPKqNQjyusRoKaJAkDgVlScXaFG/rUGQKYmVM9MmLM=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=aED5bSRYEHMAJeGmL2CjtTZNwKKnPDmijHlCLxePFXguh/QsSCQujm+MW4GvvISdkK1+vAn1EC8lEBJenioD7iamswKw3adHFhxFg+MPEG3YHAxIpooYe/VU8bo3tAVAcB9HlqxaJNPoCTKblMYg3LCkuvRH9Vg4MMeDU2t3Uxc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=JfbT+1xi; arc=none smtp.client-ip=117.135.210.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="JfbT+1xi" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=0CaPG GT5Nb49Lgi2Fhlg+7izeIcy26jCF0+UBWrjnmk=; b=JfbT+1xijGs6miiyCn0nz 6pXVX+GiU72HFboIOkjktudVBO1jrqWGf+3vJ7kP4eP91xszXGpbQXEMr8JCFq4V 9Htq+/+7foc1iiyK63tN09Xp8oSgatRjKy7onYWXGlLiEZKhqV7ESiVCqG/g3LAk ZLf8lM9ns9zFFqyh/FA3L8= Received: from localhost.localdomain (unknown [111.48.69.246]) by gzga-smtp-mtada-g0-1 (Coremail) with SMTP id _____wD3_wIMnyFnWR+xEA--.876S2; Wed, 30 Oct 2024 10:50:53 +0800 (CST) From: zhouyuhang To: brauner@kernel.org, shuah@kernel.org Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, zhouyuhang Subject: [PATCH v3] selftests: clone3: Use the capget and capset syscall directly Date: Wed, 30 Oct 2024 10:50:45 +0800 Message-Id: <20241030025045.1156941-1-zhouyuhang1010@163.com> X-Mailer: git-send-email 2.27.0 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: _____wD3_wIMnyFnWR+xEA--.876S2 X-Coremail-Antispam: 1Uf129KBjvJXoWxJw4kWr4kJrWkJryxuF48JFb_yoW5KF18pa ykJrsxKrs5Wr1xGFWFywsruFnYkF95Xw47Jr1UAw1jkr1akr4xtF4FkFyqq3Wj9ayDu3yY qa18KayxZFyDAFJanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07juFALUUUUU= X-CM-SenderInfo: 52kr35xxkd0warqriqqrwthudrp/1tbiYAKIJmchlfLjjgAAsA From: zhouyuhang The libcap commit aca076443591 ("Make cap_t operations thread safe.") added a __u8 mutex at the beginning of the struct _cap_struct, it changes the offset of the members in the structure that breaks the assumption made in the "struct libcap" definition in clone3_cap_checkpoint_restore.c. This will cause the test case to fail with the following output: # RUN global.clone3_cap_checkpoint_restore ... # clone3() syscall supported # clone3_cap_checkpoint_restore.c:151:clone3_cap_checkpoint_restore:Child has PID 130508 cap_set_proc: Operation not permitted # clone3_cap_checkpoint_restore.c:160:clone3_cap_checkpoint_restore:Expected set_capability() (-1) == 0 (0) # clone3_cap_checkpoint_restore.c:161:clone3_cap_checkpoint_restore:Could not set CAP_CHECKPOINT_RESTORE # clone3_cap_checkpoint_restore: Test terminated by assertion # FAIL global.clone3_cap_checkpoint_restore Changing to using capget and capset syscall directly here can fix this error, just like what the commit 663af70aabb7 ("bpf: selftests: Add helpers to directly use the capget and capset syscall") does. Signed-off-by: zhouyuhang --- .../clone3/clone3_cap_checkpoint_restore.c | 58 +++++++++---------- 1 file changed, 27 insertions(+), 31 deletions(-) diff --git a/tools/testing/selftests/clone3/clone3_cap_checkpoint_restore.c b/tools/testing/selftests/clone3/clone3_cap_checkpoint_restore.c index 3c196fa86c99..8b61702bf721 100644 --- a/tools/testing/selftests/clone3/clone3_cap_checkpoint_restore.c +++ b/tools/testing/selftests/clone3/clone3_cap_checkpoint_restore.c @@ -27,6 +27,13 @@ #include "../kselftest_harness.h" #include "clone3_selftests.h" +/* + * Prevent not being defined in the header file + */ +#ifndef CAP_CHECKPOINT_RESTORE +#define CAP_CHECKPOINT_RESTORE 40 +#endif + static void child_exit(int ret) { fflush(stdout); @@ -87,47 +94,36 @@ static int test_clone3_set_tid(struct __test_metadata *_metadata, return ret; } -struct libcap { - struct __user_cap_header_struct hdr; - struct __user_cap_data_struct data[2]; -}; - static int set_capability(void) { - cap_value_t cap_values[] = { CAP_SETUID, CAP_SETGID }; - struct libcap *cap; - int ret = -1; - cap_t caps; - - caps = cap_get_proc(); - if (!caps) { - perror("cap_get_proc"); + struct __user_cap_data_struct data[2]; + struct __user_cap_header_struct hdr = { + .version = _LINUX_CAPABILITY_VERSION_3, + }; + __u32 cap0 = 1 << CAP_SETUID | 1 << CAP_SETGID; + __u32 cap1 = 1 << (CAP_CHECKPOINT_RESTORE - 32); + int ret; + + ret = capget(&hdr, data); + if (ret) { + perror("capget"); return -1; } /* Drop all capabilities */ - if (cap_clear(caps)) { - perror("cap_clear"); - goto out; - } - - cap_set_flag(caps, CAP_EFFECTIVE, 2, cap_values, CAP_SET); - cap_set_flag(caps, CAP_PERMITTED, 2, cap_values, CAP_SET); + memset(&data, 0, sizeof(data)); - cap = (struct libcap *) caps; + data[0].effective |= cap0; + data[0].permitted |= cap0; - /* 40 -> CAP_CHECKPOINT_RESTORE */ - cap->data[1].effective |= 1 << (40 - 32); - cap->data[1].permitted |= 1 << (40 - 32); + data[1].effective |= cap1; + data[1].permitted |= cap1; - if (cap_set_proc(caps)) { - perror("cap_set_proc"); - goto out; + ret = capset(&hdr, data); + if (ret) { + perror("capset"); + return -1; } - ret = 0; -out: - if (cap_free(caps)) - perror("cap_free"); return ret; }