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apparmor: new helper - common_path_perm()

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was open-coded in several places...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-03-25 15:04:36 -04:00
parent be01f9f28e
commit 741aca71d6
1 changed files with 12 additions and 35 deletions
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47
security/apparmor/lsm.c
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@ -182,23 +182,22 @@ static int common_perm_dir_dentry(int op, struct path *dir,
}
/**
* common_perm_mnt_dentry - common permission wrapper when mnt, dentry
* common_perm_path - common permission wrapper when mnt, dentry
* @op: operation being checked
* @mnt: mount point of dentry (NOT NULL)
* @dentry: dentry to check (NOT NULL)
* @path: location to check (NOT NULL)
* @mask: requested permissions mask
*
* Returns: %0 else error code if error or permission denied
*/
static int common_perm_mnt_dentry(int op, struct vfsmount *mnt,
struct dentry *dentry, u32 mask)
static inline int common_perm_path(int op, const struct path *path, u32 mask)
{
struct path path = { mnt, dentry };
struct path_cond cond = { d_backing_inode(dentry)->i_uid,
d_backing_inode(dentry)->i_mode
struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
d_backing_inode(path->dentry)->i_mode
};
if (!mediated_filesystem(path->dentry))
return 0;
return common_perm(op, &path, mask, &cond);
return common_perm(op, path, mask, &cond);
}
/**
@ -271,15 +270,7 @@ static int apparmor_path_mknod(struct path *dir, struct dentry *dentry,
static int apparmor_path_truncate(const struct path *path)
{
struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
d_backing_inode(path->dentry)->i_mode
};
if (!mediated_filesystem(path->dentry))
return 0;
return common_perm(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE,
&cond);
return common_perm_path(OP_TRUNC, path, MAY_WRITE | AA_MAY_META_WRITE);
}
static int apparmor_path_symlink(struct path *dir, struct dentry *dentry,
@ -336,31 +327,17 @@ static int apparmor_path_rename(struct path *old_dir, struct dentry *old_dentry,
static int apparmor_path_chmod(const struct path *path, umode_t mode)
{
if (!mediated_filesystem(path->dentry))
return 0;
return common_perm_mnt_dentry(OP_CHMOD, path->mnt, path->dentry, AA_MAY_CHMOD);
return common_perm_path(OP_CHMOD, path, AA_MAY_CHMOD);
}
static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
{
struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
d_backing_inode(path->dentry)->i_mode
};
if (!mediated_filesystem(path->dentry))
return 0;
return common_perm(OP_CHOWN, path, AA_MAY_CHOWN, &cond);
return common_perm_path(OP_CHOWN, path, AA_MAY_CHOWN);
}
static int apparmor_inode_getattr(const struct path *path)
{
if (!mediated_filesystem(path->dentry))
return 0;
return common_perm_mnt_dentry(OP_GETATTR, path->mnt, path->dentry,
AA_MAY_META_READ);
return common_perm_path(OP_GETATTR, path, AA_MAY_META_READ);
}
static int apparmor_file_open(struct file *file, const struct cred *cred)