From mboxrd@z Thu Jan 1 00:00:00 1970 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 6F9071D1741; Fri, 11 Oct 2024 21:46:20 +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=1728683180; cv=none; b=R+dUiK208qUVchfDA4m1naSQCWCAJXk/zGpgmW7QbjyETlC3Mw91D2en9KxO3+lDN2kGMzIq/kitrk7BzGQdc4BmKXZk1Z/qTHRfO8y+n67IpQZvIgM6/1uPB/BEH0MhsXmsoPdNfNX+CiaLAnuT+tF2nl1/TIO87xnm/OkAH04= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728683180; c=relaxed/simple; bh=4zdhHcyUigfcaZd/+sZsZAsCVbg3OR83S3y+KsQlK0g=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=NaAFzl8t3k7q2k8FR7VVfbMDGhn7queLsyg78S9FUza1mMhtc4yS3aZezGRT/BV1cuv4IfZ4p5zt3ZIbAY6NrUoM51J6atVC+gYVTJDxi+aNorwUmLOne4t2X8ksClE3qRPYwxSJCKuLBJqpMGKq5R5+sU9F95TUq/eEhMLSg/A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=l2O6kdjl; 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="l2O6kdjl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A93BDC4CEC3; Fri, 11 Oct 2024 21:46:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728683179; bh=4zdhHcyUigfcaZd/+sZsZAsCVbg3OR83S3y+KsQlK0g=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=l2O6kdjl9QJ9+/Su6JtnxOYnfJ/dSHD/Y1pN87j9DlIpJayvPMSqquZxxf8oMxJSq /Jwh74t9G6xH+vuPG3vovQo7YA7H5ELkxxmhU/1Tg0qSGRDZH4xloN3kyj7rbpxdkn fu+ysZ3ERYn2O4QdmmyO86+IoOW4KDDDPJiCarZyvtye7tSpR3seD0EDKTKcxxzMPI PTt9MUrz/BiO3X4QjI8D3u7VK5ocm5YAE5OsyNRLp0K3J9WVtgk2TjCtDgvwImiyl8 cPl0jDY/OhH2IcikWCaZMQjAejMZ9O7G02ypMuK+wiOzPhzC8th9layOqoTeO6jBCh 1oaPvlvtSAHOA== From: Christian Brauner Date: Fri, 11 Oct 2024 23:45:53 +0200 Subject: [PATCH RFC v2 4/4] selftests: add overlayfs fd mounting selftests Precedence: bulk X-Mailing-List: linux-unionfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20241011-work-overlayfs-v2-4-1b43328c5a31@kernel.org> References: <20241011-work-overlayfs-v2-0-1b43328c5a31@kernel.org> In-Reply-To: <20241011-work-overlayfs-v2-0-1b43328c5a31@kernel.org> To: Miklos Szeredi , Amir Goldstein Cc: Josef Bacik , linux-fsdevel@vger.kernel.org, linux-unionfs@vger.kernel.org, Christian Brauner X-Mailer: b4 0.15-dev-2a633 X-Developer-Signature: v=1; a=openpgp-sha256; l=6353; i=brauner@kernel.org; h=from:subject:message-id; bh=4zdhHcyUigfcaZd/+sZsZAsCVbg3OR83S3y+KsQlK0g=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMaRzzlksdDq4fXp6hJbc5ZNVvP8DxX5d4J3//bOE2IVTM g9nGiVt7ChlYRDjYpAVU2RxaDcJl1vOU7HZKFMDZg4rE8gQBi5OAZhIbSMjw/m5Z+dszZL1U9ZX DNM/EPNT3sfoKneBANv1vYt/mDak1TAyPNiiPnXiZHmubvXD8bzcGabCU64+/akcWvBHWqkp5Xo dDwA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Signed-off-by: Christian Brauner --- .../selftests/filesystems/overlayfs/.gitignore | 1 + .../selftests/filesystems/overlayfs/Makefile | 2 +- .../filesystems/overlayfs/set_layers_via_fds.c | 122 +++++++++++++++++++++ .../selftests/filesystems/overlayfs/wrappers.h | 4 + 4 files changed, 128 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/filesystems/overlayfs/.gitignore b/tools/testing/selftests/filesystems/overlayfs/.gitignore index 52ae618fdd980ee22424d35d79f077077b132401..e23a18c8b37f2cdbb121496b1df1faffd729ad79 100644 --- a/tools/testing/selftests/filesystems/overlayfs/.gitignore +++ b/tools/testing/selftests/filesystems/overlayfs/.gitignore @@ -1,2 +1,3 @@ # SPDX-License-Identifier: GPL-2.0-only dev_in_maps +set_layers_via_fds diff --git a/tools/testing/selftests/filesystems/overlayfs/Makefile b/tools/testing/selftests/filesystems/overlayfs/Makefile index 56b2b48a765b1d6706faee14616597ed0315f267..e8d1adb021af44588dd7af1049de66833bb584ce 100644 --- a/tools/testing/selftests/filesystems/overlayfs/Makefile +++ b/tools/testing/selftests/filesystems/overlayfs/Makefile @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 -TEST_GEN_PROGS := dev_in_maps +TEST_GEN_PROGS := dev_in_maps set_layers_via_fds CFLAGS := -Wall -Werror diff --git a/tools/testing/selftests/filesystems/overlayfs/set_layers_via_fds.c b/tools/testing/selftests/filesystems/overlayfs/set_layers_via_fds.c new file mode 100644 index 0000000000000000000000000000000000000000..d3b497eea5e5c9f718caa4957f7fec7c40970502 --- /dev/null +++ b/tools/testing/selftests/filesystems/overlayfs/set_layers_via_fds.c @@ -0,0 +1,122 @@ +// SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE +#define __SANE_USERSPACE_TYPES__ // Use ll64 + +#include +#include +#include +#include +#include +#include +#include + +#include "../../kselftest_harness.h" +#include "log.h" +#include "wrappers.h" + +FIXTURE(set_layers_via_fds) { +}; + +FIXTURE_SETUP(set_layers_via_fds) +{ + ASSERT_EQ(mkdir("/set_layers_via_fds", 0755), 0); +} + +FIXTURE_TEARDOWN(set_layers_via_fds) +{ + umount2("/set_layers_via_fds", 0); + ASSERT_EQ(rmdir("/set_layers_via_fds"), 0); +} + +TEST_F(set_layers_via_fds, set_layers_via_fds) +{ + int fd_context, fd_tmpfs, fd_overlay; + int layer_fds[5] = { -EBADF, -EBADF, -EBADF, -EBADF, -EBADF }; + bool layers_found[5] = { false, false, false, false, false }; + size_t len = 0; + char *line = NULL; + FILE *f_mountinfo; + + ASSERT_EQ(unshare(CLONE_NEWNS), 0); + ASSERT_EQ(sys_mount(NULL, "/", NULL, MS_SLAVE | MS_REC, NULL), 0); + + fd_context = sys_fsopen("tmpfs", 0); + ASSERT_GE(fd_context, 0); + + ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); + fd_tmpfs = sys_fsmount(fd_context, 0, 0); + ASSERT_GE(fd_tmpfs, 0); + ASSERT_EQ(close(fd_context), 0); + + ASSERT_EQ(mkdirat(fd_tmpfs, "w", 0755), 0); + ASSERT_EQ(mkdirat(fd_tmpfs, "u", 0755), 0); + ASSERT_EQ(mkdirat(fd_tmpfs, "l1", 0755), 0); + ASSERT_EQ(mkdirat(fd_tmpfs, "l2", 0755), 0); + ASSERT_EQ(mkdirat(fd_tmpfs, "l3", 0755), 0); + + layer_fds[0] = openat(fd_tmpfs, "w", O_DIRECTORY); + ASSERT_GE(layer_fds[0], 0); + + layer_fds[1] = openat(fd_tmpfs, "u", O_DIRECTORY); + ASSERT_GE(layer_fds[1], 0); + + layer_fds[2] = openat(fd_tmpfs, "l1", O_DIRECTORY); + ASSERT_GE(layer_fds[2], 0); + + layer_fds[3] = openat(fd_tmpfs, "l2", O_DIRECTORY); + ASSERT_GE(layer_fds[3], 0); + + layer_fds[4] = openat(fd_tmpfs, "l3", O_DIRECTORY); + ASSERT_GE(layer_fds[4], 0); + + ASSERT_EQ(sys_move_mount(fd_tmpfs, "", -EBADF, "/tmp", MOVE_MOUNT_F_EMPTY_PATH), 0); + ASSERT_EQ(close(fd_tmpfs), 0); + + fd_context = sys_fsopen("overlay", 0); + ASSERT_GE(fd_context, 0); + + ASSERT_NE(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir", NULL, layer_fds[2]), 0); + + ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "workdir", NULL, layer_fds[0]), 0); + ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "upperdir", NULL, layer_fds[1]), 0); + ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[2]), 0); + ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[3]), 0); + ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_SET_FD, "lowerdir+", NULL, layer_fds[4]), 0); + + ASSERT_EQ(sys_fsconfig(fd_context, FSCONFIG_CMD_CREATE, NULL, NULL, 0), 0); + + fd_overlay = sys_fsmount(fd_context, 0, 0); + ASSERT_GE(fd_overlay, 0); + + ASSERT_EQ(sys_move_mount(fd_overlay, "", -EBADF, "/set_layers_via_fds", MOVE_MOUNT_F_EMPTY_PATH), 0); + + f_mountinfo = fopen("/proc/self/mountinfo", "r"); + ASSERT_NE(f_mountinfo, NULL); + + while (getline(&line, &len, f_mountinfo) != -1) { + char *haystack = line; + + if (strstr(haystack, "workdir=/tmp/w")) + layers_found[0] = true; + if (strstr(haystack, "upperdir=/tmp/u")) + layers_found[1] = true; + if (strstr(haystack, "lowerdir+=/tmp/l1")) + layers_found[2] = true; + if (strstr(haystack, "lowerdir+=/tmp/l2")) + layers_found[3] = true; + if (strstr(haystack, "lowerdir+=/tmp/l3")) + layers_found[4] = true; + } + free(line); + + for (int i = 0; i < 5; i++) { + ASSERT_EQ(layers_found[i], true); + ASSERT_EQ(close(layer_fds[i]), 0); + } + + ASSERT_EQ(close(fd_context), 0); + ASSERT_EQ(close(fd_overlay), 0); + ASSERT_EQ(fclose(f_mountinfo), 0); +} + +TEST_HARNESS_MAIN diff --git a/tools/testing/selftests/filesystems/overlayfs/wrappers.h b/tools/testing/selftests/filesystems/overlayfs/wrappers.h index 4f99e10f7f018fd9a7be5263f68d34807da4c53c..071b95fd2ac0ad7b02d90e8e89df73fd27be69c3 100644 --- a/tools/testing/selftests/filesystems/overlayfs/wrappers.h +++ b/tools/testing/selftests/filesystems/overlayfs/wrappers.h @@ -32,6 +32,10 @@ static inline int sys_mount(const char *src, const char *tgt, const char *fst, return syscall(__NR_mount, src, tgt, fst, flags, data); } +#ifndef MOVE_MOUNT_F_EMPTY_PATH +#define MOVE_MOUNT_F_EMPTY_PATH 0x00000004 /* Empty from path permitted */ +#endif + static inline int sys_move_mount(int from_dfd, const char *from_pathname, int to_dfd, const char *to_pathname, unsigned int flags) -- 2.45.2