Commit 5289ba41 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds

[PATCH] selinux: clean up binary mount data

From: James Morris <jmorris@redhat.com>

selinux is currently inspecting the filesystem name ("nfs" vs "coda" vs
watever) to work out whether it needs to hanbdle binary mount data.

Eliminate all that by adding a flag to file_system_type.fs_flags.
parent ef01bd3f
......@@ -53,6 +53,7 @@ static struct file_system_type afs_fs_type = {
.name = "afs",
.get_sb = afs_get_sb,
.kill_sb = kill_anon_super,
.fs_flags = FS_BINARY_MOUNTDATA,
};
static struct super_operations afs_super_ops = {
......
......@@ -309,5 +309,6 @@ struct file_system_type coda_fs_type = {
.name = "coda",
.get_sb = coda_get_sb,
.kill_sb = kill_anon_super,
.fs_flags = FS_BINARY_MOUNTDATA,
};
......@@ -1352,7 +1352,7 @@ static struct file_system_type nfs_fs_type = {
.name = "nfs",
.get_sb = nfs_get_sb,
.kill_sb = nfs_kill_super,
.fs_flags = FS_ODD_RENAME|FS_REVAL_DOT,
.fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
#ifdef CONFIG_NFS_V4
......@@ -1666,7 +1666,7 @@ static struct file_system_type nfs4_fs_type = {
.name = "nfs4",
.get_sb = nfs4_get_sb,
.kill_sb = nfs_kill_super,
.fs_flags = FS_ODD_RENAME|FS_REVAL_DOT,
.fs_flags = FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};
#define nfs4_zero_state(nfsi) \
......
......@@ -779,6 +779,7 @@ static struct file_system_type smb_fs_type = {
.name = "smbfs",
.get_sb = smb_get_sb,
.kill_sb = kill_anon_super,
.fs_flags = FS_BINARY_MOUNTDATA,
};
static int __init init_smb_fs(void)
......
......@@ -745,7 +745,7 @@ do_kern_mount(const char *fstype, int flags, const char *name, void *data)
goto out_mnt;
}
error = security_sb_copy_data(fstype, data, secdata);
error = security_sb_copy_data(type, data, secdata);
if (error) {
sb = ERR_PTR(error);
goto out_free_secdata;
......
......@@ -89,6 +89,7 @@ extern int leases_enable, dir_notify_enable, lease_break_time;
/* public flags for file_system_type */
#define FS_REQUIRES_DEV 1
#define FS_BINARY_MOUNTDATA 2
#define FS_REVAL_DOT 16384 /* Check the paths ".", ".." for staleness */
#define FS_ODD_RENAME 32768 /* Temporary stuff; will go away as soon
* as nfs_rename() will be cleaned up
......
......@@ -177,7 +177,7 @@ struct swap_info_struct;
* options cleanly (a filesystem may modify the data e.g. with strsep()).
* This also allows the original mount data to be stripped of security-
* specific options to avoid having to make filesystems aware of them.
* @fstype the type of filesystem being mounted.
* @type the type of filesystem being mounted.
* @orig the original mount data copied from userspace.
* @copy copied data which will be passed to the security module.
* Returns 0 if the copy was successful.
......@@ -1033,7 +1033,8 @@ struct security_operations {
int (*sb_alloc_security) (struct super_block * sb);
void (*sb_free_security) (struct super_block * sb);
int (*sb_copy_data)(const char *fstype, void *orig, void *copy);
int (*sb_copy_data)(struct file_system_type *type,
void *orig, void *copy);
int (*sb_kern_mount) (struct super_block *sb, void *data);
int (*sb_statfs) (struct super_block * sb);
int (*sb_mount) (char *dev_name, struct nameidata * nd,
......@@ -1318,9 +1319,10 @@ static inline void security_sb_free (struct super_block *sb)
security_ops->sb_free_security (sb);
}
static inline int security_sb_copy_data (const char *fstype, void *orig, void *copy)
static inline int security_sb_copy_data (struct file_system_type *type,
void *orig, void *copy)
{
return security_ops->sb_copy_data (fstype, orig, copy);
return security_ops->sb_copy_data (type, orig, copy);
}
static inline int security_sb_kern_mount (struct super_block *sb, void *data)
......@@ -1988,7 +1990,8 @@ static inline int security_sb_alloc (struct super_block *sb)
static inline void security_sb_free (struct super_block *sb)
{ }
static inline int security_sb_copy_data (const char *fstype, void *orig, void *copy)
static inline int security_sb_copy_data (struct file_system_type *type,
void *orig, void *copy)
{
return 0;
}
......
......@@ -194,7 +194,8 @@ static void dummy_sb_free_security (struct super_block *sb)
return;
}
static int dummy_sb_copy_data (const char *fstype, void *orig, void *copy)
static int dummy_sb_copy_data (struct file_system_type *type,
void *orig, void *copy)
{
return 0;
}
......
......@@ -331,10 +331,7 @@ static int try_context_mount(struct super_block *sb, void *data)
name = sb->s_type->name;
/* Ignore these fileystems with binary mount option data. */
if (!strcmp(name, "coda") ||
!strcmp(name, "afs") || !strcmp(name, "smbfs"))
goto out;
if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) {
/* NFS we understand. */
if (!strcmp(name, "nfs")) {
......@@ -347,9 +344,11 @@ static int try_context_mount(struct super_block *sb, void *data)
context = d->context;
seen |= Opt_context;
}
} else
goto out;
/* Standard string-based options. */
} else {
/* Standard string-based options. */
char *p, *options = data;
while ((p = strsep(&options, ",")) != NULL) {
......@@ -1885,7 +1884,7 @@ static inline void take_option(char **to, char *from, int *first, int len)
*to += len;
}
static int selinux_sb_copy_data(const char *fstype, void *orig, void *copy)
static int selinux_sb_copy_data(struct file_system_type *type, void *orig, void *copy)
{
int fnosec, fsec, rc = 0;
char *in_save, *in_curr, *in_end;
......@@ -1895,8 +1894,7 @@ static int selinux_sb_copy_data(const char *fstype, void *orig, void *copy)
sec_curr = copy;
/* Binary mount data: just copy */
if (!strcmp(fstype, "nfs") || !strcmp(fstype, "coda") ||
!strcmp(fstype, "smbfs") || !strcmp(fstype, "afs")) {
if (type->fs_flags & FS_BINARY_MOUNTDATA) {
copy_page(sec_curr, in_curr);
goto out;
}
......
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