vfs: Suppress MS_* flag defs within the kernel unless explicitly enabled

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 <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Reviewed-by: David Howells <dhowells@redhat.com>

diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
index b2cae79..714dc5c 100644 (file)
--- a/arch/arc/kernel/setup.c
+++ b/arch/arc/kernel/setup.c
@@ -19,6 +19,7 @@
 #include <linux/of_fdt.h>
 #include <linux/of.h>
 #include <linux/cache.h>
+#include <uapi/linux/mount.h>
 #include <asm/sections.h>
 #include <asm/arcregs.h>
 #include <asm/tlb.h>

diff --git a/arch/arm/kernel/atags_parse.c b/arch/arm/kernel/atags_parse.c
index c10a3e8..a8a4333 100644 (file)
--- a/arch/arm/kernel/atags_parse.c
+++ b/arch/arm/kernel/atags_parse.c
@@ -24,6 +24,7 @@
 #include <linux/root_dev.h>
 #include <linux/screen_info.h>
 #include <linux/memblock.h>
+#include <uapi/linux/mount.h>
 
 #include <asm/setup.h>
 #include <asm/system_info.h>

diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index c286cf5..2c0e0f3 100644 (file)
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -32,6 +32,7 @@
 #include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/uaccess.h>
+#include <uapi/linux/mount.h>
 #include <asm/io.h>
 #include <asm/page.h>
 #include <asm/elf.h>

diff --git a/arch/sparc/kernel/setup_32.c b/arch/sparc/kernel/setup_32.c
index 13664c3..7df3d70 100644 (file)
--- a/arch/sparc/kernel/setup_32.c
+++ b/arch/sparc/kernel/setup_32.c
@@ -34,6 +34,7 @@
 #include <linux/kdebug.h>
 #include <linux/export.h>
 #include <linux/start_kernel.h>
+#include <uapi/linux/mount.h>
 
 #include <asm/io.h>
 #include <asm/processor.h>

diff --git a/arch/sparc/kernel/setup_64.c b/arch/sparc/kernel/setup_64.c
index cd2825c..0143909 100644 (file)
--- a/arch/sparc/kernel/setup_64.c
+++ b/arch/sparc/kernel/setup_64.c
@@ -33,6 +33,7 @@
 #include <linux/module.h>
 #include <linux/start_kernel.h>
 #include <linux/memblock.h>
+#include <uapi/linux/mount.h>
 
 #include <asm/io.h>
 #include <asm/processor.h>

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index b74e7bf..25a9802 100644 (file)
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -50,6 +50,7 @@
 #include <linux/kvm_para.h>
 #include <linux/dma-contiguous.h>
 #include <xen/xen.h>
+#include <uapi/linux/mount.h>
 
 #include <linux/errno.h>
 #include <linux/kernel.h>

diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index b93fc86..0dbc430 100644 (file)
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -25,6 +25,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/kthread.h>
+#include <uapi/linux/mount.h>
 #include "base.h"
 
 static struct task_struct *thread;

diff --git a/fs/namespace.c b/fs/namespace.c
index 98d27da..6ae784e 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -26,6 +26,7 @@
 #include <linux/memblock.h>
 #include <linux/task_work.h>
 #include <linux/sched/task.h>
+#include <uapi/linux/mount.h>
 
 #include "pnode.h"
 #include "internal.h"

diff --git a/fs/pnode.c b/fs/pnode.c
index 53d411a..1100e81 100644 (file)
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -10,6 +10,7 @@
 #include <linux/mount.h>
 #include <linux/fs.h>
 #include <linux/nsproxy.h>
+#include <uapi/linux/mount.h>
 #include "internal.h"
 #include "pnode.h"
 

diff --git a/fs/super.c b/fs/super.c
index ca53a08..6654de0 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -35,6 +35,7 @@
 #include <linux/fsnotify.h>
 #include <linux/lockdep.h>
 #include <linux/user_namespace.h>
+#include <uapi/linux/mount.h>
 #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 a441ea1..53a22e8 100644 (file)
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -14,6 +14,11 @@
 #include <linux/ioctl.h>
 #include <linux/types.h>
 
+/* Use of MS_* flags within the kernel is restricted to core mount(2) code. */
+#if !defined(__KERNEL__)
+#include <linux/mount.h>
+#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
new file mode 100644 (file)
index 0000000..3f9ec42
--- /dev/null
+++ b/include/uapi/linux/mount.h
@@ -0,0 +1,58 @@
+#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
+
+#endif /* _UAPI_LINUX_MOUNT_H */

diff --git a/init/do_mounts.c b/init/do_mounts.c
index a754e3b..f8c230c 100644 (file)
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -22,6 +22,7 @@
 #include <linux/nfs_fs.h>
 #include <linux/nfs_fs_sb.h>
 #include <linux/nfs_mount.h>
+#include <uapi/linux/mount.h>
 
 #include "do_mounts.h"
 

diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index d1a5d88..56a5574 100644 (file)
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -8,6 +8,7 @@
 #include <linux/sched.h>
 #include <linux/freezer.h>
 #include <linux/kmod.h>
+#include <uapi/linux/mount.h>
 
 #include "do_mounts.h"
 

diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 42446a2..2c01087 100644 (file)
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -26,6 +26,7 @@
 #include <linux/netfilter_ipv4.h>
 #include <linux/netfilter_ipv6.h>
 #include <net/sock.h>
+#include <uapi/linux/mount.h>
 
 #include "include/apparmor.h"
 #include "include/apparmorfs.h"

diff --git a/security/apparmor/mount.c b/security/apparmor/mount.c
index c1da224..8c37873 100644 (file)
--- a/security/apparmor/mount.c
+++ b/security/apparmor/mount.c
@@ -15,6 +15,7 @@
 #include <linux/fs.h>
 #include <linux/mount.h>
 #include <linux/namei.h>
+#include <uapi/linux/mount.h>
 
 #include "include/apparmor.h"
 #include "include/audit.h"

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 7ce6832..f695438 100644 (file)
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -88,6 +88,7 @@
 #include <linux/msg.h>
 #include <linux/shm.h>
 #include <linux/bpf.h>
+#include <uapi/linux/mount.h>
 
 #include "avc.h"
 #include "objsec.h"

diff --git a/security/tomoyo/mount.c b/security/tomoyo/mount.c
index 807fd91..7dc7f59 100644 (file)
--- a/security/tomoyo/mount.c
+++ b/security/tomoyo/mount.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/slab.h>
+#include <uapi/linux/mount.h>
 #include "common.h"
 
 /* String table for special mount operations. */