From patchwork Wed Oct 9 20:40:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksa Sarai X-Patchwork-Id: 13829227 Received: from mout-p-101.mailbox.org (mout-p-101.mailbox.org [80.241.56.151]) (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 BD5B11E2855; Wed, 9 Oct 2024 20:42:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.151 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728506561; cv=none; b=HW6h1Gj0YInAwlil6c3lSpQqFZT5HJsT/uOdZCo2uVxUR8Rr04ZxB9v+UeTiNTEOBN2J0RGkXx6To50HdUcxXtn2eeDSVrjTJlVbeIPsARsAd9dyITW/26YCac68lVL86wRAsJdc2TNWRV2L5bIJO9Q6Omf40xpn7Ijms7XAGBk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728506561; c=relaxed/simple; bh=bqTMmhf8qrPFVj65H2ybVQSoLCqAb/vZq4GN2tCr55c=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=egQkBtA+W7eS6BT/hfkZCPENk/GRA5yREJfXbw3N7f0MLARGsvOFOkKVyTVYmJf6il5RJPJKk61kzgFtRRl/5vS6ff1kv+c6XYZBj5q+BS52iFgx/k3F5xcahBdCeZFfMl4X5tDq08YK81E9xBUHkDSTpRMyEgPLqZfh2BjwysI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=cyphar.com; spf=pass smtp.mailfrom=cyphar.com; dkim=pass (2048-bit key) header.d=cyphar.com header.i=@cyphar.com header.b=qwi4ma0s; arc=none smtp.client-ip=80.241.56.151 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=cyphar.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=cyphar.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=cyphar.com header.i=@cyphar.com header.b="qwi4ma0s" Received: from smtp102.mailbox.org (smtp102.mailbox.org [IPv6:2001:67c:2050:b231:465::102]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-101.mailbox.org (Postfix) with ESMTPS id 4XP4Zh1bXQz9sxv; Wed, 9 Oct 2024 22:42:36 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cyphar.com; s=MBO0001; t=1728506556; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=fL5eft/0SEqgXy8IyhgJaBCjETWOZ9/n50x90uqdKGE=; b=qwi4ma0sVjfL983232CndOb2Fdyuw72EPEifNfjns9iNqyZrmOyN/W5dOMy0X2DSquavK4 2okrRqQqahZXZGlbi59PvPjYL3DVjpaJZ6X0IMPqwXiTPd++xyCkxpYRHIIZfZ/2v+QI9S BiKkJzKNenauPj0NqsOQ3KcfwZlDrG0eCxMVM6/RWoxiGguZJi/OMgBemjq6IRzQhECHzD E+TqPZumX2so1n6Sl1H3VzXrPJ1sY++0YThpQAf7Q8ru5/fa2pLHsT3IY2t+pvIRwT8vRI B0GGefbonDVP8CrU2vxIA4DG8fwPLPJMaLGCiV/JQd3a7iwK2AP6J2P73gL5GA== From: Aleksa Sarai Date: Thu, 10 Oct 2024 07:40:43 +1100 Subject: [PATCH RFC v3 10/10] selftests: mount_setattr: add CHECK_FIELDS selftest Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241010-extensible-structs-check_fields-v3-10-d2833dfe6edd@cyphar.com> References: <20241010-extensible-structs-check_fields-v3-0-d2833dfe6edd@cyphar.com> In-Reply-To: <20241010-extensible-structs-check_fields-v3-0-d2833dfe6edd@cyphar.com> To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Alexander Viro , Christian Brauner , Jan Kara , Arnd Bergmann , Shuah Khan Cc: Kees Cook , Florian Weimer , Arnd Bergmann , Mark Rutland , linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org, Aleksa Sarai X-Developer-Signature: v=1; a=openpgp-sha256; l=7253; i=cyphar@cyphar.com; h=from:subject:message-id; bh=bqTMmhf8qrPFVj65H2ybVQSoLCqAb/vZq4GN2tCr55c=; b=owGbwMvMwCWmMf3Xpe0vXfIZT6slMaSzvQq6rlcTWGQ8fVFgcf/xvdEbNAv4Hc+dYfmx9foVb hG9pEsnO0pZGMS4GGTFFFm2+XmGbpq/+Eryp5VsMHNYmUCGMHBxCsBEXmkzMlycnLia72ZG7/uz CbKBke5rnU8ef/VnxeHVB6S+LVvJqGbE8L/qxP2C/lfPovb3rH+ndOjKkdsRO9zceDb+ujqFffl nhpn8AA== X-Developer-Key: i=cyphar@cyphar.com; a=openpgp; fpr=C9C370B246B09F6DBCFC744C34401015D1D2D386 X-Rspamd-Queue-Id: 4XP4Zh1bXQz9sxv While we're at it -- to make testing for error codes with ASSERT_* easier, make the sys_* wrappers return -errno in case of an error. For some reason, the include doesn't correct import , leading to compilation errors -- so just import manually. Signed-off-by: Aleksa Sarai --- tools/include/uapi/asm-generic/posix_types.h | 101 +++++++++++++++++++++ tools/testing/selftests/mount_setattr/Makefile | 2 +- .../selftests/mount_setattr/mount_setattr_test.c | 53 ++++++++++- 3 files changed, 153 insertions(+), 3 deletions(-) diff --git a/tools/include/uapi/asm-generic/posix_types.h b/tools/include/uapi/asm-generic/posix_types.h new file mode 100644 index 000000000000..b5f7594eee7a --- /dev/null +++ b/tools/include/uapi/asm-generic/posix_types.h @@ -0,0 +1,101 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef __ASM_GENERIC_POSIX_TYPES_H +#define __ASM_GENERIC_POSIX_TYPES_H + +#include +/* + * This file is generally used by user-level software, so you need to + * be a little careful about namespace pollution etc. + * + * First the types that are often defined in different ways across + * architectures, so that you can override them. + */ + +#ifndef __kernel_long_t +typedef long __kernel_long_t; +typedef unsigned long __kernel_ulong_t; +#endif + +#ifndef __kernel_ino_t +typedef __kernel_ulong_t __kernel_ino_t; +#endif + +#ifndef __kernel_mode_t +typedef unsigned int __kernel_mode_t; +#endif + +#ifndef __kernel_pid_t +typedef int __kernel_pid_t; +#endif + +#ifndef __kernel_ipc_pid_t +typedef int __kernel_ipc_pid_t; +#endif + +#ifndef __kernel_uid_t +typedef unsigned int __kernel_uid_t; +typedef unsigned int __kernel_gid_t; +#endif + +#ifndef __kernel_suseconds_t +typedef __kernel_long_t __kernel_suseconds_t; +#endif + +#ifndef __kernel_daddr_t +typedef int __kernel_daddr_t; +#endif + +#ifndef __kernel_uid32_t +typedef unsigned int __kernel_uid32_t; +typedef unsigned int __kernel_gid32_t; +#endif + +#ifndef __kernel_old_uid_t +typedef __kernel_uid_t __kernel_old_uid_t; +typedef __kernel_gid_t __kernel_old_gid_t; +#endif + +#ifndef __kernel_old_dev_t +typedef unsigned int __kernel_old_dev_t; +#endif + +/* + * Most 32 bit architectures use "unsigned int" size_t, + * and all 64 bit architectures use "unsigned long" size_t. + */ +#ifndef __kernel_size_t +#if __BITS_PER_LONG != 64 +typedef unsigned int __kernel_size_t; +typedef int __kernel_ssize_t; +typedef int __kernel_ptrdiff_t; +#else +typedef __kernel_ulong_t __kernel_size_t; +typedef __kernel_long_t __kernel_ssize_t; +typedef __kernel_long_t __kernel_ptrdiff_t; +#endif +#endif + +#ifndef __kernel_fsid_t +typedef struct { + int val[2]; +} __kernel_fsid_t; +#endif + +/* + * anything below here should be completely generic + */ +typedef __kernel_long_t __kernel_off_t; +typedef long long __kernel_loff_t; +typedef __kernel_long_t __kernel_old_time_t; +#ifndef __KERNEL__ +typedef __kernel_long_t __kernel_time_t; +#endif +typedef long long __kernel_time64_t; +typedef __kernel_long_t __kernel_clock_t; +typedef int __kernel_timer_t; +typedef int __kernel_clockid_t; +typedef char * __kernel_caddr_t; +typedef unsigned short __kernel_uid16_t; +typedef unsigned short __kernel_gid16_t; + +#endif /* __ASM_GENERIC_POSIX_TYPES_H */ diff --git a/tools/testing/selftests/mount_setattr/Makefile b/tools/testing/selftests/mount_setattr/Makefile index 0c0d7b1234c1..3f260506fe60 100644 --- a/tools/testing/selftests/mount_setattr/Makefile +++ b/tools/testing/selftests/mount_setattr/Makefile @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 # Makefile for mount selftests. -CFLAGS = -g $(KHDR_INCLUDES) -Wall -O2 -pthread +CFLAGS = -g $(KHDR_INCLUDES) $(TOOLS_INCLUDES) -Wall -O2 -pthread TEST_GEN_PROGS := mount_setattr_test diff --git a/tools/testing/selftests/mount_setattr/mount_setattr_test.c b/tools/testing/selftests/mount_setattr/mount_setattr_test.c index c6a8c732b802..36b8286e5f43 100644 --- a/tools/testing/selftests/mount_setattr/mount_setattr_test.c +++ b/tools/testing/selftests/mount_setattr/mount_setattr_test.c @@ -11,6 +11,7 @@ #include #include #include +#include /* get __kernel_* typedefs */ #include #include #include @@ -137,7 +138,8 @@ static inline int sys_mount_setattr(int dfd, const char *path, unsigned int flags, struct mount_attr *attr, size_t size) { - return syscall(__NR_mount_setattr, dfd, path, flags, attr, size); + int ret = syscall(__NR_mount_setattr, dfd, path, flags, attr, size); + return ret >= 0 ? ret : -errno; } #ifndef OPEN_TREE_CLONE @@ -152,9 +154,24 @@ static inline int sys_mount_setattr(int dfd, const char *path, unsigned int flag #define AT_RECURSIVE 0x8000 /* Apply to the entire subtree */ #endif +#define FSMOUNT_VALID_FLAGS \ + (MOUNT_ATTR_RDONLY | MOUNT_ATTR_NOSUID | MOUNT_ATTR_NODEV | \ + MOUNT_ATTR_NOEXEC | MOUNT_ATTR__ATIME | MOUNT_ATTR_NODIRATIME | \ + MOUNT_ATTR_NOSYMFOLLOW) + +#define MOUNT_SETATTR_VALID_FLAGS (FSMOUNT_VALID_FLAGS | MOUNT_ATTR_IDMAP) + +#define MOUNT_SETATTR_PROPAGATION_FLAGS \ + (MS_UNBINDABLE | MS_PRIVATE | MS_SLAVE | MS_SHARED) + +#ifndef CHECK_FIELDS +#define CHECK_FIELDS (1ULL << 63) +#endif + static inline int sys_open_tree(int dfd, const char *filename, unsigned int flags) { - return syscall(__NR_open_tree, dfd, filename, flags); + int ret = syscall(__NR_open_tree, dfd, filename, flags); + return ret >= 0 ? ret : -errno; } static ssize_t write_nointr(int fd, const void *buf, size_t count) @@ -1497,4 +1514,36 @@ TEST_F(mount_setattr, mount_attr_nosymfollow) ASSERT_EQ(close(fd), 0); } +TEST_F(mount_setattr, check_fields) +{ + struct mount_attr_ext { + struct mount_attr inner; + uint64_t extra1; + uint64_t extra2; + uint64_t extra3; + } attr; + + /* Set the structure to dummy values. */ + memset(&attr, 0xAB, sizeof(attr)); + + if (!mount_setattr_supported()) + SKIP(return, "mount_setattr syscall not supported"); + + /* Make sure that invalid sizes are detected even with CHECK_FIELDS. */ + EXPECT_EQ(sys_mount_setattr(-1, "", 0, (struct mount_attr *) &attr, CHECK_FIELDS), -EINVAL); + EXPECT_EQ(sys_mount_setattr(-1, "", 0, (struct mount_attr *) &attr, CHECK_FIELDS | 0xF000), -E2BIG); + + /* Actually get the CHECK_FIELDS results. */ + ASSERT_EQ(sys_mount_setattr(-1, "", 0, (struct mount_attr *) &attr, CHECK_FIELDS | sizeof(attr)), -EEXTSYS_NOOP); + + EXPECT_EQ(attr.inner.attr_set, MOUNT_SETATTR_VALID_FLAGS); + EXPECT_EQ(attr.inner.attr_clr, MOUNT_SETATTR_VALID_FLAGS); + EXPECT_EQ(attr.inner.propagation, MOUNT_SETATTR_PROPAGATION_FLAGS); + EXPECT_EQ(attr.inner.userns_fd, 0xFFFFFFFFFFFFFFFF); + /* Trailing fields outside ksize must be zeroed. */ + EXPECT_EQ(attr.extra1, 0); + EXPECT_EQ(attr.extra2, 0); + EXPECT_EQ(attr.extra3, 0); +} + TEST_HARNESS_MAIN