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Subject[PATCH 16/34] vfs: Remove unused code after filesystem context changes [ver #12]
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Date
Remove code that is now unused after the filesystem context changes.

Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/internal.h | 2 -
fs/super.c | 62 --------------------------
include/linux/lsm_hooks.h | 12 -----
include/linux/security.h | 13 -----
security/security.c | 10 ----
security/selinux/hooks.c | 106 --------------------------------------------
security/smack/smack_lsm.c | 33 --------------
7 files changed, 238 deletions(-)

diff --git a/fs/internal.h b/fs/internal.h
index fc2da60abbcd..73942ff5aa09 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -116,8 +116,6 @@ extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
*/
extern int reconfigure_super(struct fs_context *);
extern bool trylock_super(struct super_block *sb);
-extern struct dentry *mount_fs(struct file_system_type *,
- int, const char *, void *, size_t);
extern struct super_block *user_get_super(dev_t);

/*
diff --git a/fs/super.c b/fs/super.c
index df8c4cebd000..de43b140bbb1 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1478,68 +1478,6 @@ struct dentry *mount_single(struct file_system_type *fs_type,
}
EXPORT_SYMBOL(mount_single);

-struct dentry *
-mount_fs(struct file_system_type *type, int flags, const char *name,
- void *data, size_t data_size)
-{
- struct dentry *root;
- struct super_block *sb;
- char *secdata = NULL;
- int error = -ENOMEM;
-
- if (data && !(type->fs_flags & FS_BINARY_MOUNTDATA)) {
- secdata = alloc_secdata();
- if (!secdata)
- goto out;
-
- error = security_sb_copy_data(data, data_size, secdata);
- if (error)
- goto out_free_secdata;
- }
-
- root = type->mount(type, flags, name, data, data_size);
- if (IS_ERR(root)) {
- error = PTR_ERR(root);
- goto out_free_secdata;
- }
- sb = root->d_sb;
- BUG_ON(!sb);
- WARN_ON(!sb->s_bdi);
-
- /*
- * Write barrier is for super_cache_count(). We place it before setting
- * SB_BORN as the data dependency between the two functions is the
- * superblock structure contents that we just set up, not the SB_BORN
- * flag.
- */
- smp_wmb();
- sb->s_flags |= SB_BORN;
-
- error = security_sb_kern_mount(sb, flags, secdata, data_size);
- if (error)
- goto out_sb;
-
- /*
- * filesystems should never set s_maxbytes larger than MAX_LFS_FILESIZE
- * but s_maxbytes was an unsigned long long for many releases. Throw
- * this warning for a little while to try and catch filesystems that
- * violate this rule.
- */
- WARN((sb->s_maxbytes < 0), "%s set sb->s_maxbytes to "
- "negative value (%lld)\n", type->name, sb->s_maxbytes);
-
- up_write(&sb->s_umount);
- free_secdata(secdata);
- return root;
-out_sb:
- dput(root);
- deactivate_locked_super(sb);
-out_free_secdata:
- free_secdata(secdata);
-out:
- return ERR_PTR(error);
-}
-
/*
* Setup private BDI for given superblock. It gets automatically cleaned up
* in generic_shutdown_super().
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 7e50bfa1aee0..fff43b0523a9 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -160,13 +160,6 @@
* @orig_data is the size of the original data
* @copy copied data which will be passed to the security module.
* Returns 0 if the copy was successful.
- * @sb_remount:
- * Extracts security system specific mount options and verifies no changes
- * are being made to those options.
- * @sb superblock being remounted
- * @data contains the filesystem-specific data.
- * @data_size contains the size of the data.
- * Return 0 if permission is granted.
* @sb_umount:
* Check permission before the @mnt file system is unmounted.
* @mnt contains the mounted file system.
@@ -1522,9 +1515,6 @@ union security_list_options {
int (*sb_alloc_security)(struct super_block *sb);
void (*sb_free_security)(struct super_block *sb);
int (*sb_copy_data)(char *orig, size_t orig_size, char *copy);
- int (*sb_remount)(struct super_block *sb, void *data, size_t data_size);
- int (*sb_kern_mount)(struct super_block *sb, int flags,
- void *data, size_t data_size);
int (*sb_show_options)(struct seq_file *m, struct super_block *sb);
int (*sb_statfs)(struct dentry *dentry);
int (*sb_mount)(const char *dev_name, const struct path *path,
@@ -1872,8 +1862,6 @@ struct security_hook_heads {
struct hlist_head sb_alloc_security;
struct hlist_head sb_free_security;
struct hlist_head sb_copy_data;
- struct hlist_head sb_remount;
- struct hlist_head sb_kern_mount;
struct hlist_head sb_show_options;
struct hlist_head sb_statfs;
struct hlist_head sb_mount;
diff --git a/include/linux/security.h b/include/linux/security.h
index bae191a96c73..11157798d4f8 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -261,8 +261,6 @@ int security_sb_mountpoint(struct fs_context *fc, struct path *mountpoint,
int security_sb_alloc(struct super_block *sb);
void security_sb_free(struct super_block *sb);
int security_sb_copy_data(char *orig, size_t orig_size, char *copy);
-int security_sb_remount(struct super_block *sb, void *data, size_t data_size);
-int security_sb_kern_mount(struct super_block *sb, int flags, void *data, size_t data_size);
int security_sb_show_options(struct seq_file *m, struct super_block *sb);
int security_sb_statfs(struct dentry *dentry);
int security_sb_mount(const char *dev_name, const struct path *path,
@@ -608,17 +606,6 @@ static inline int security_sb_copy_data(char *orig, size_t orig_size, char *copy
return 0;
}

-static inline int security_sb_remount(struct super_block *sb, void *data, size_t data_size)
-{
- return 0;
-}
-
-static inline int security_sb_kern_mount(struct super_block *sb, int flags,
- void *data, size_t data_size)
-{
- return 0;
-}
-
static inline int security_sb_show_options(struct seq_file *m,
struct super_block *sb)
{
diff --git a/security/security.c b/security/security.c
index 64304d20aae1..d902810f2749 100644
--- a/security/security.c
+++ b/security/security.c
@@ -420,16 +420,6 @@ int security_sb_copy_data(char *orig, size_t data_size, char *copy)
}
EXPORT_SYMBOL(security_sb_copy_data);

-int security_sb_remount(struct super_block *sb, void *data, size_t data_size)
-{
- return call_int_hook(sb_remount, 0, sb, data, data_size);
-}
-
-int security_sb_kern_mount(struct super_block *sb, int flags, void *data, size_t data_size)
-{
- return call_int_hook(sb_kern_mount, 0, sb, flags, data, data_size);
-}
-
int security_sb_show_options(struct seq_file *m, struct super_block *sb)
{
return call_int_hook(sb_show_options, 0, m, sb);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 5f2af9dd44fa..99c2c40c5d7a 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2832,110 +2832,6 @@ static int selinux_sb_copy_data(char *orig, size_t data_size, char *copy)
return rc;
}

-static int selinux_sb_remount(struct super_block *sb, void *data, size_t data_size)
-{
- int rc, i, *flags;
- struct security_mnt_opts opts;
- char *secdata, **mount_options;
- struct superblock_security_struct *sbsec = sb->s_security;
-
- if (!(sbsec->flags & SE_SBINITIALIZED))
- return 0;
-
- if (!data)
- return 0;
-
- if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
- return 0;
-
- security_init_mnt_opts(&opts);
- secdata = alloc_secdata();
- if (!secdata)
- return -ENOMEM;
- rc = selinux_sb_copy_data(data, data_size, secdata);
- if (rc)
- goto out_free_secdata;
-
- rc = selinux_parse_opts_str(secdata, &opts);
- if (rc)
- goto out_free_secdata;
-
- mount_options = opts.mnt_opts;
- flags = opts.mnt_opts_flags;
-
- for (i = 0; i < opts.num_mnt_opts; i++) {
- u32 sid;
-
- if (flags[i] == SBLABEL_MNT)
- continue;
- rc = security_context_str_to_sid(&selinux_state,
- mount_options[i], &sid,
- GFP_KERNEL);
- if (rc) {
- pr_warn("SELinux: security_context_str_to_sid"
- "(%s) failed for (dev %s, type %s) errno=%d\n",
- mount_options[i], sb->s_id, sb->s_type->name, rc);
- goto out_free_opts;
- }
- rc = -EINVAL;
- switch (flags[i]) {
- case FSCONTEXT_MNT:
- if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid))
- goto out_bad_option;
- break;
- case CONTEXT_MNT:
- if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid))
- goto out_bad_option;
- break;
- case ROOTCONTEXT_MNT: {
- struct inode_security_struct *root_isec;
- root_isec = backing_inode_security(sb->s_root);
-
- if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
- goto out_bad_option;
- break;
- }
- case DEFCONTEXT_MNT:
- if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid))
- goto out_bad_option;
- break;
- default:
- goto out_free_opts;
- }
- }
-
- rc = 0;
-out_free_opts:
- security_free_mnt_opts(&opts);
-out_free_secdata:
- free_secdata(secdata);
- return rc;
-out_bad_option:
- pr_warn("SELinux: unable to change security options "
- "during remount (dev %s, type=%s)\n", sb->s_id,
- sb->s_type->name);
- goto out_free_opts;
-}
-
-static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data, size_t data_size)
-{
- const struct cred *cred = current_cred();
- struct common_audit_data ad;
- int rc;
-
- rc = superblock_doinit(sb, data);
- if (rc)
- return rc;
-
- /* Allow all mounts performed by the kernel */
- if (flags & MS_KERNMOUNT)
- return 0;
-
- ad.type = LSM_AUDIT_DATA_DENTRY;
- ad.u.dentry = sb->s_root;
- return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad);
-}
-
static int selinux_sb_statfs(struct dentry *dentry)
{
const struct cred *cred = current_cred();
@@ -7205,8 +7101,6 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(sb_alloc_security, selinux_sb_alloc_security),
LSM_HOOK_INIT(sb_free_security, selinux_sb_free_security),
LSM_HOOK_INIT(sb_copy_data, selinux_sb_copy_data),
- LSM_HOOK_INIT(sb_remount, selinux_sb_remount),
- LSM_HOOK_INIT(sb_kern_mount, selinux_sb_kern_mount),
LSM_HOOK_INIT(sb_show_options, selinux_sb_show_options),
LSM_HOOK_INIT(sb_statfs, selinux_sb_statfs),
LSM_HOOK_INIT(sb_mount, selinux_mount),
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index da7121d24bce..1f51a8ac11d7 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -1164,38 +1164,6 @@ static int smack_set_mnt_opts(struct super_block *sb,
return 0;
}

-/**
- * smack_sb_kern_mount - Smack specific mount processing
- * @sb: the file system superblock
- * @flags: the mount flags
- * @data: the smack mount options
- *
- * Returns 0 on success, an error code on failure
- */
-static int smack_sb_kern_mount(struct super_block *sb, int flags,
- void *data, size_t data_size)
-{
- int rc = 0;
- char *options = data;
- struct security_mnt_opts opts;
-
- security_init_mnt_opts(&opts);
-
- if (!options)
- goto out;
-
- rc = smack_parse_opts_str(options, &opts);
- if (rc)
- goto out_err;
-
-out:
- rc = smack_set_mnt_opts(sb, &opts, 0, NULL);
-
-out_err:
- security_free_mnt_opts(&opts);
- return rc;
-}
-
/**
* smack_sb_statfs - Smack check on statfs
* @dentry: identifies the file system in question
@@ -4985,7 +4953,6 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data),
- LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount),
LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),
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