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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 04/33] vfs: Suppress MS_* flag defs within the kernel unless explicitly enabled [ver #11] From: David Howells To: viro@zeniv.linux.org.uk Cc: torvalds@linux-foundation.org, dhowells@redhat.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 01 Aug 2018 16:24:30 +0100 Message-ID: <153313707094.13253.9967026191676513298.stgit@warthog.procyon.org.uk> In-Reply-To: <153313703562.13253.5766498657900728120.stgit@warthog.procyon.org.uk> References: <153313703562.13253.5766498657900728120.stgit@warthog.procyon.org.uk> User-Agent: StGit/unknown-version MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Wed, 01 Aug 2018 15:24:32 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.6]); Wed, 01 Aug 2018 15:24:32 +0000 (UTC) for IP:'10.11.54.5' DOMAIN:'int-mx05.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'dhowells@redhat.com' RCPT:'' Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Only the mount namespace code that implements mount(2) should be using the MS_* flags. Suppress them inside the kernel unless uapi/linux/mount.h is included. Signed-off-by: David Howells --- arch/arc/kernel/setup.c | 1 + arch/arm/kernel/atags_parse.c | 1 + arch/sh/kernel/setup.c | 1 + arch/sparc/kernel/setup_32.c | 1 + arch/sparc/kernel/setup_64.c | 1 + arch/x86/kernel/setup.c | 1 + drivers/base/devtmpfs.c | 1 + fs/f2fs/super.c | 2 + fs/pnode.c | 1 + fs/super.c | 1 + include/uapi/linux/fs.h | 56 ++++------------------------------------- include/uapi/linux/mount.h | 54 ++++++++++++++++++++++++++++++++++++++++ init/do_mounts.c | 1 + init/do_mounts_initrd.c | 1 + security/apparmor/lsm.c | 1 + security/apparmor/mount.c | 1 + security/selinux/hooks.c | 1 + security/tomoyo/mount.c | 1 + 18 files changed, 75 insertions(+), 52 deletions(-) diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c index b2cae79a25d7..714dc5c2baf1 100644 --- a/arch/arc/kernel/setup.c +++ b/arch/arc/kernel/setup.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include diff --git a/arch/arm/kernel/atags_parse.c b/arch/arm/kernel/atags_parse.c index c10a3e8ee998..a8a4333929f5 100644 --- a/arch/arm/kernel/atags_parse.c +++ b/arch/arm/kernel/atags_parse.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c index c286cf5da6e7..2c0e0f37a318 100644 --- a/arch/sh/kernel/setup.c +++ b/arch/sh/kernel/setup.c @@ -32,6 +32,7 @@ #include #include #include +#include #include #include #include diff --git a/arch/sparc/kernel/setup_32.c b/arch/sparc/kernel/setup_32.c index 13664c377196..7df3d704284c 100644 --- a/arch/sparc/kernel/setup_32.c +++ b/arch/sparc/kernel/setup_32.c @@ -34,6 +34,7 @@ #include #include #include +#include #include #include diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c index 7944b3ca216a..206bf81eedaf 100644 --- a/arch/sparc/kernel/setup_64.c +++ b/arch/sparc/kernel/setup_64.c @@ -33,6 +33,7 @@ #include #include #include +#include #include #include diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index 2f86d883dd95..3413f53e0a35 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -51,6 +51,7 @@ #include #include #include +#include #include #include diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index 9c0126ad7de1..1b87a1e03b45 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -25,6 +25,7 @@ #include #include #include +#include #include "base.h" static struct task_struct *thread; diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 1c56a9f2598d..3dbf69209fe2 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1454,7 +1454,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, err = dquot_suspend(sb, -1); if (err < 0) goto restore_opts; - } else if (f2fs_readonly(sb) && !(*flags & MS_RDONLY)) { + } else if (f2fs_readonly(sb) && !(*flags & SB_RDONLY)) { /* dquot_resume needs RW */ sb->s_flags &= ~SB_RDONLY; if (sb_any_quota_suspended(sb)) { diff --git a/fs/pnode.c b/fs/pnode.c index 53d411a371ce..1100e810d855 100644 --- a/fs/pnode.c +++ b/fs/pnode.c @@ -10,6 +10,7 @@ #include #include #include +#include #include "internal.h" #include "pnode.h" diff --git a/fs/super.c b/fs/super.c index c9333d317b5f..c9d208b7999e 100644 --- a/fs/super.c +++ b/fs/super.c @@ -35,6 +35,7 @@ #include #include #include +#include #include "internal.h" static int thaw_super_locked(struct super_block *sb); diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h index 73e01918f996..1c982eb44ff4 100644 --- a/include/uapi/linux/fs.h +++ b/include/uapi/linux/fs.h @@ -14,6 +14,11 @@ #include #include +/* Use of MS_* flags within the kernel is restricted to core mount(2) code. */ +#if !defined(__KERNEL__) +#include +#endif + /* * It's silly to have NR_OPEN bigger than NR_FILE, but you can change * the file limit at runtime and only root can increase the per-process @@ -101,57 +106,6 @@ struct inodes_stat_t { #define NR_FILE 8192 /* this can well be larger on a larger system */ - -/* - * These are the fs-independent mount-flags: up to 32 flags are supported - */ -#define MS_RDONLY 1 /* Mount read-only */ -#define MS_NOSUID 2 /* Ignore suid and sgid bits */ -#define MS_NODEV 4 /* Disallow access to device special files */ -#define MS_NOEXEC 8 /* Disallow program execution */ -#define MS_SYNCHRONOUS 16 /* Writes are synced at once */ -#define MS_REMOUNT 32 /* Alter flags of a mounted FS */ -#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ -#define MS_DIRSYNC 128 /* Directory modifications are synchronous */ -#define MS_NOATIME 1024 /* Do not update access times. */ -#define MS_NODIRATIME 2048 /* Do not update directory access times */ -#define MS_BIND 4096 -#define MS_MOVE 8192 -#define MS_REC 16384 -#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. - MS_VERBOSE is deprecated. */ -#define MS_SILENT 32768 -#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ -#define MS_UNBINDABLE (1<<17) /* change to unbindable */ -#define MS_PRIVATE (1<<18) /* change to private */ -#define MS_SLAVE (1<<19) /* change to slave */ -#define MS_SHARED (1<<20) /* change to shared */ -#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ -#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ -#define MS_I_VERSION (1<<23) /* Update inode I_version field */ -#define MS_STRICTATIME (1<<24) /* Always perform atime updates */ -#define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */ - -/* These sb flags are internal to the kernel */ -#define MS_SUBMOUNT (1<<26) -#define MS_NOREMOTELOCK (1<<27) -#define MS_NOSEC (1<<28) -#define MS_BORN (1<<29) -#define MS_ACTIVE (1<<30) -#define MS_NOUSER (1<<31) - -/* - * Superblock flags that can be altered by MS_REMOUNT - */ -#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\ - MS_LAZYTIME) - -/* - * Old magic mount flag and mask - */ -#define MS_MGC_VAL 0xC0ED0000 -#define MS_MGC_MSK 0xffff0000 - /* * Structure for FS_IOC_FSGETXATTR[A] and FS_IOC_FSSETXATTR. */ diff --git a/include/uapi/linux/mount.h b/include/uapi/linux/mount.h index 89adf0d731ab..3634e065836c 100644 --- a/include/uapi/linux/mount.h +++ b/include/uapi/linux/mount.h @@ -1,6 +1,60 @@ #ifndef _UAPI_LINUX_MOUNT_H #define _UAPI_LINUX_MOUNT_H +/* + * These are the fs-independent mount-flags: up to 32 flags are supported + * + * Usage of these is restricted within the kernel to core mount(2) code and + * callers of sys_mount() only. Filesystems should be using the SB_* + * equivalent instead. + */ +#define MS_RDONLY 1 /* Mount read-only */ +#define MS_NOSUID 2 /* Ignore suid and sgid bits */ +#define MS_NODEV 4 /* Disallow access to device special files */ +#define MS_NOEXEC 8 /* Disallow program execution */ +#define MS_SYNCHRONOUS 16 /* Writes are synced at once */ +#define MS_REMOUNT 32 /* Alter flags of a mounted FS */ +#define MS_MANDLOCK 64 /* Allow mandatory locks on an FS */ +#define MS_DIRSYNC 128 /* Directory modifications are synchronous */ +#define MS_NOATIME 1024 /* Do not update access times. */ +#define MS_NODIRATIME 2048 /* Do not update directory access times */ +#define MS_BIND 4096 +#define MS_MOVE 8192 +#define MS_REC 16384 +#define MS_VERBOSE 32768 /* War is peace. Verbosity is silence. + MS_VERBOSE is deprecated. */ +#define MS_SILENT 32768 +#define MS_POSIXACL (1<<16) /* VFS does not apply the umask */ +#define MS_UNBINDABLE (1<<17) /* change to unbindable */ +#define MS_PRIVATE (1<<18) /* change to private */ +#define MS_SLAVE (1<<19) /* change to slave */ +#define MS_SHARED (1<<20) /* change to shared */ +#define MS_RELATIME (1<<21) /* Update atime relative to mtime/ctime. */ +#define MS_KERNMOUNT (1<<22) /* this is a kern_mount call */ +#define MS_I_VERSION (1<<23) /* Update inode I_version field */ +#define MS_STRICTATIME (1<<24) /* Always perform atime updates */ +#define MS_LAZYTIME (1<<25) /* Update the on-disk [acm]times lazily */ + +/* These sb flags are internal to the kernel */ +#define MS_SUBMOUNT (1<<26) +#define MS_NOREMOTELOCK (1<<27) +#define MS_NOSEC (1<<28) +#define MS_BORN (1<<29) +#define MS_ACTIVE (1<<30) +#define MS_NOUSER (1<<31) + +/* + * Superblock flags that can be altered by MS_REMOUNT + */ +#define MS_RMT_MASK (MS_RDONLY|MS_SYNCHRONOUS|MS_MANDLOCK|MS_I_VERSION|\ + MS_LAZYTIME) + +/* + * Old magic mount flag and mask + */ +#define MS_MGC_VAL 0xC0ED0000 +#define MS_MGC_MSK 0xffff0000 + /* * open_tree() flags. */ diff --git a/init/do_mounts.c b/init/do_mounts.c index 7e26be00c444..d4fc2a5afdb6 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -32,6 +32,7 @@ #include #include #include +#include #include "do_mounts.h" diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c index 5a91aefa7305..65de0412f80f 100644 --- a/init/do_mounts_initrd.c +++ b/init/do_mounts_initrd.c @@ -18,6 +18,7 @@ #include #include #include +#include #include "do_mounts.h" diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index bc3e209d2bd4..84e644ce3583 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -24,6 +24,7 @@ #include #include #include +#include #include "include/apparmor.h" #include "include/apparmorfs.h" diff --git a/security/apparmor/mount.c b/security/apparmor/mount.c index c1da22482bfb..8c3787399356 100644 --- a/security/apparmor/mount.c +++ b/security/apparmor/mount.c @@ -15,6 +15,7 @@ #include #include #include +#include #include "include/apparmor.h" #include "include/audit.h" diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index f5e5c8a087ae..ef0428311a5c 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -88,6 +88,7 @@ #include #include #include +#include #include "avc.h" #include "objsec.h" diff --git a/security/tomoyo/mount.c b/security/tomoyo/mount.c index 807fd91dbb54..7dc7f59b7dde 100644 --- a/security/tomoyo/mount.c +++ b/security/tomoyo/mount.c @@ -6,6 +6,7 @@ */ #include +#include #include "common.h" /* String table for special mount operations. */