#include <linux/falloc.h>
#include <linux/sched/signal.h>
#include <linux/fiemap.h>
+#include <linux/mount.h>
+#include <linux/fscrypt.h>
+#include <linux/fileattr.h>
#include "internal.h"
return ret;
}
+/**
+ * fileattr_fill_xflags - initialize fileattr with xflags
+ * @fa: fileattr pointer
+ * @xflags: FS_XFLAG_* flags
+ *
+ * Set ->fsx_xflags, ->fsx_valid and ->flags (translated xflags). All
+ * other fields are zeroed.
+ */
+void fileattr_fill_xflags(struct fileattr *fa, u32 xflags)
+{
+ memset(fa, 0, sizeof(*fa));
+ fa->fsx_valid = true;
+ fa->fsx_xflags = xflags;
+ if (fa->fsx_xflags & FS_XFLAG_IMMUTABLE)
+ fa->flags |= FS_IMMUTABLE_FL;
+ if (fa->fsx_xflags & FS_XFLAG_APPEND)
+ fa->flags |= FS_APPEND_FL;
+ if (fa->fsx_xflags & FS_XFLAG_SYNC)
+ fa->flags |= FS_SYNC_FL;
+ if (fa->fsx_xflags & FS_XFLAG_NOATIME)
+ fa->flags |= FS_NOATIME_FL;
+ if (fa->fsx_xflags & FS_XFLAG_NODUMP)
+ fa->flags |= FS_NODUMP_FL;
+ if (fa->fsx_xflags & FS_XFLAG_DAX)
+ fa->flags |= FS_DAX_FL;
+ if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
+ fa->flags |= FS_PROJINHERIT_FL;
+}
+EXPORT_SYMBOL(fileattr_fill_xflags);
+
+/**
+ * fileattr_fill_flags - initialize fileattr with flags
+ * @fa: fileattr pointer
+ * @flags: FS_*_FL flags
+ *
+ * Set ->flags, ->flags_valid and ->fsx_xflags (translated flags).
+ * All other fields are zeroed.
+ */
+void fileattr_fill_flags(struct fileattr *fa, u32 flags)
+{
+ memset(fa, 0, sizeof(*fa));
+ fa->flags_valid = true;
+ fa->flags = flags;
+ if (fa->flags & FS_SYNC_FL)
+ fa->fsx_xflags |= FS_XFLAG_SYNC;
+ if (fa->flags & FS_IMMUTABLE_FL)
+ fa->fsx_xflags |= FS_XFLAG_IMMUTABLE;
+ if (fa->flags & FS_APPEND_FL)
+ fa->fsx_xflags |= FS_XFLAG_APPEND;
+ if (fa->flags & FS_NODUMP_FL)
+ fa->fsx_xflags |= FS_XFLAG_NODUMP;
+ if (fa->flags & FS_NOATIME_FL)
+ fa->fsx_xflags |= FS_XFLAG_NOATIME;
+ if (fa->flags & FS_DAX_FL)
+ fa->fsx_xflags |= FS_XFLAG_DAX;
+ if (fa->flags & FS_PROJINHERIT_FL)
+ fa->fsx_xflags |= FS_XFLAG_PROJINHERIT;
+}
+EXPORT_SYMBOL(fileattr_fill_flags);
+
+/**
+ * vfs_fileattr_get - retrieve miscellaneous file attributes
+ * @dentry: the object to retrieve from
+ * @fa: fileattr pointer
+ *
+ * Call i_op->fileattr_get() callback, if exists.
+ *
+ * Return: 0 on success, or a negative error on failure.
+ */
+int vfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
+{
+ struct inode *inode = d_inode(dentry);
+
+ if (!inode->i_op->fileattr_get)
+ return -ENOIOCTLCMD;
+
+ return inode->i_op->fileattr_get(dentry, fa);
+}
+EXPORT_SYMBOL(vfs_fileattr_get);
+
+/**
+ * copy_fsxattr_to_user - copy fsxattr to userspace.
+ * @fa: fileattr pointer
+ * @ufa: fsxattr user pointer
+ *
+ * Return: 0 on success, or -EFAULT on failure.
+ */
+int copy_fsxattr_to_user(const struct fileattr *fa, struct fsxattr __user *ufa)
+{
+ struct fsxattr xfa;
+
+ memset(&xfa, 0, sizeof(xfa));
+ xfa.fsx_xflags = fa->fsx_xflags;
+ xfa.fsx_extsize = fa->fsx_extsize;
+ xfa.fsx_nextents = fa->fsx_nextents;
+ xfa.fsx_projid = fa->fsx_projid;
+ xfa.fsx_cowextsize = fa->fsx_cowextsize;
+
+ if (copy_to_user(ufa, &xfa, sizeof(xfa)))
+ return -EFAULT;
+
+ return 0;
+}
+EXPORT_SYMBOL(copy_fsxattr_to_user);
+
+static int copy_fsxattr_from_user(struct fileattr *fa,
+ struct fsxattr __user *ufa)
+{
+ struct fsxattr xfa;
+
+ if (copy_from_user(&xfa, ufa, sizeof(xfa)))
+ return -EFAULT;
+
+ fileattr_fill_xflags(fa, xfa.fsx_xflags);
+ fa->fsx_extsize = xfa.fsx_extsize;
+ fa->fsx_nextents = xfa.fsx_nextents;
+ fa->fsx_projid = xfa.fsx_projid;
+ fa->fsx_cowextsize = xfa.fsx_cowextsize;
+
+ return 0;
+}
+
+/*
+ * Generic function to check FS_IOC_FSSETXATTR/FS_IOC_SETFLAGS values and reject
+ * any invalid configurations.
+ *
+ * Note: must be called with inode lock held.
+ */
+static int fileattr_set_prepare(struct inode *inode,
+ const struct fileattr *old_ma,
+ struct fileattr *fa)
+{
+ int err;
+
+ /*
+ * The IMMUTABLE and APPEND_ONLY flags can only be changed by
+ * the relevant capability.
+ */
+ if ((fa->flags ^ old_ma->flags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) &&
+ !capable(CAP_LINUX_IMMUTABLE))
+ return -EPERM;
+
+ err = fscrypt_prepare_setflags(inode, old_ma->flags, fa->flags);
+ if (err)
+ return err;
+
+ /*
+ * Project Quota ID state is only allowed to change from within the init
+ * namespace. Enforce that restriction only if we are trying to change
+ * the quota ID state. Everything else is allowed in user namespaces.
+ */
+ if (current_user_ns() != &init_user_ns) {
+ if (old_ma->fsx_projid != fa->fsx_projid)
+ return -EINVAL;
+ if ((old_ma->fsx_xflags ^ fa->fsx_xflags) &
+ FS_XFLAG_PROJINHERIT)
+ return -EINVAL;
+ }
+
+ /* Check extent size hints. */
+ if ((fa->fsx_xflags & FS_XFLAG_EXTSIZE) && !S_ISREG(inode->i_mode))
+ return -EINVAL;
+
+ if ((fa->fsx_xflags & FS_XFLAG_EXTSZINHERIT) &&
+ !S_ISDIR(inode->i_mode))
+ return -EINVAL;
+
+ if ((fa->fsx_xflags & FS_XFLAG_COWEXTSIZE) &&
+ !S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
+ return -EINVAL;
+
+ /*
+ * It is only valid to set the DAX flag on regular files and
+ * directories on filesystems.
+ */
+ if ((fa->fsx_xflags & FS_XFLAG_DAX) &&
+ !(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
+ return -EINVAL;
+
+ /* Extent size hints of zero turn off the flags. */
+ if (fa->fsx_extsize == 0)
+ fa->fsx_xflags &= ~(FS_XFLAG_EXTSIZE | FS_XFLAG_EXTSZINHERIT);
+ if (fa->fsx_cowextsize == 0)
+ fa->fsx_xflags &= ~FS_XFLAG_COWEXTSIZE;
+
+ return 0;
+}
+
+/**
+ * vfs_fileattr_set - change miscellaneous file attributes
+ * @mnt_userns: user namespace of the mount
+ * @dentry: the object to change
+ * @fa: fileattr pointer
+ *
+ * After verifying permissions, call i_op->fileattr_set() callback, if
+ * exists.
+ *
+ * Verifying attributes involves retrieving current attributes with
+ * i_op->fileattr_get(), this also allows initializing attributes that have
+ * not been set by the caller to current values. Inode lock is held
+ * thoughout to prevent racing with another instance.
+ *
+ * Return: 0 on success, or a negative error on failure.
+ */
+int vfs_fileattr_set(struct user_namespace *mnt_userns, struct dentry *dentry,
+ struct fileattr *fa)
+{
+ struct inode *inode = d_inode(dentry);
+ struct fileattr old_ma = {};
+ int err;
+
+ if (!inode->i_op->fileattr_set)
+ return -ENOIOCTLCMD;
+
+ if (!inode_owner_or_capable(mnt_userns, inode))
+ return -EPERM;
+
+ inode_lock(inode);
+ err = vfs_fileattr_get(dentry, &old_ma);
+ if (!err) {
+ /* initialize missing bits from old_ma */
+ if (fa->flags_valid) {
+ fa->fsx_xflags |= old_ma.fsx_xflags & ~FS_XFLAG_COMMON;
+ fa->fsx_extsize = old_ma.fsx_extsize;
+ fa->fsx_nextents = old_ma.fsx_nextents;
+ fa->fsx_projid = old_ma.fsx_projid;
+ fa->fsx_cowextsize = old_ma.fsx_cowextsize;
+ } else {
+ fa->flags |= old_ma.flags & ~FS_COMMON_FL;
+ }
+ err = fileattr_set_prepare(inode, &old_ma, fa);
+ if (!err)
+ err = inode->i_op->fileattr_set(mnt_userns, dentry, fa);
+ }
+ inode_unlock(inode);
+
+ return err;
+}
+EXPORT_SYMBOL(vfs_fileattr_set);
+
+static int ioctl_getflags(struct file *file, unsigned int __user *argp)
+{
+ struct fileattr fa = { .flags_valid = true }; /* hint only */
+ int err;
+
+ err = vfs_fileattr_get(file->f_path.dentry, &fa);
+ if (!err)
+ err = put_user(fa.flags, argp);
+ return err;
+}
+
+static int ioctl_setflags(struct file *file, unsigned int __user *argp)
+{
+ struct user_namespace *mnt_userns = file_mnt_user_ns(file);
+ struct dentry *dentry = file->f_path.dentry;
+ struct fileattr fa;
+ unsigned int flags;
+ int err;
+
+ err = get_user(flags, argp);
+ if (!err) {
+ err = mnt_want_write_file(file);
+ if (!err) {
+ fileattr_fill_flags(&fa, flags);
+ err = vfs_fileattr_set(mnt_userns, dentry, &fa);
+ mnt_drop_write_file(file);
+ }
+ }
+ return err;
+}
+
+static int ioctl_fsgetxattr(struct file *file, void __user *argp)
+{
+ struct fileattr fa = { .fsx_valid = true }; /* hint only */
+ int err;
+
+ err = vfs_fileattr_get(file->f_path.dentry, &fa);
+ if (!err)
+ err = copy_fsxattr_to_user(&fa, argp);
+
+ return err;
+}
+
+static int ioctl_fssetxattr(struct file *file, void __user *argp)
+{
+ struct user_namespace *mnt_userns = file_mnt_user_ns(file);
+ struct dentry *dentry = file->f_path.dentry;
+ struct fileattr fa;
+ int err;
+
+ err = copy_fsxattr_from_user(&fa, argp);
+ if (!err) {
+ err = mnt_want_write_file(file);
+ if (!err) {
+ err = vfs_fileattr_set(mnt_userns, dentry, &fa);
+ mnt_drop_write_file(file);
+ }
+ }
+ return err;
+}
+
/*
* do_vfs_ioctl() is not for drivers and not intended to be EXPORT_SYMBOL()'d.
* It's just a simple helper for sys_ioctl and compat_sys_ioctl.
return put_user(i_size_read(inode) - filp->f_pos,
(int __user *)argp);
+ case FS_IOC_GETFLAGS:
+ return ioctl_getflags(filp, argp);
+
+ case FS_IOC_SETFLAGS:
+ return ioctl_setflags(filp, argp);
+
+ case FS_IOC_FSGETXATTR:
+ return ioctl_fsgetxattr(filp, argp);
+
+ case FS_IOC_FSSETXATTR:
+ return ioctl_fssetxattr(filp, argp);
+
default:
if (S_ISREG(inode->i_mode))
return file_ioctl(filp, cmd, argp);
break;
#endif
+ /*
+ * These access 32-bit values anyway so no further handling is
+ * necessary.
+ */
+ case FS_IOC32_GETFLAGS:
+ case FS_IOC32_SETFLAGS:
+ cmd = (cmd == FS_IOC32_GETFLAGS) ?
+ FS_IOC_GETFLAGS : FS_IOC_SETFLAGS;
+ fallthrough;
/*
* everything else in do_vfs_ioctl() takes either a compatible
* pointer argument or no argument -- call it with a modified
projects / linux-2.6-microblaze.git / blobdiff