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serenity/Base/usr/share/man/man2/bindmount.md
Liav A 0bbd9040ef Kernel+Userland: Split bind-mounting and re-mounting from mount syscall 
These 2 are an actual separate types of syscalls, so let's stop using
special flags for bind mounting or re-mounting and instead let userspace
calling directly for this kind of actions.
2023-05-17 23:39:15 -06:00

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Name

bindmount - create a bindmount from source_fd to a target path.

Synopsis

#include <LibCore/System.h>

ErrorOr<void> bindmount(int source_fd, StringView target, int flags);

Description

bindmount() create a bindmount from source_fd to a target path target, with mount flags of flags.

The following flags are supported:

  • MS_NODEV: Disallow opening any devices from this file system.
  • MS_NOEXEC: Disallow executing any executables from this file system.
  • MS_NOSUID: Ignore set-user-id bits on executables from this file system.
  • MS_RDONLY: Mount the filesystem read-only.
  • MS_WXALLOWED: Allow W^X protection circumvention for executables on this file system.
  • MS_AXALLOWED: Allow anonymous executable mappings for executables on this file system.
  • MS_NOREGULAR: Disallow opening any regular files from this file system.

These flags can be used as a security measure to limit the possible abuses of the mounted file system.

Errors

  • EINVAL: The flags value contains deprecated flags such as MS_REMOUNT or MS_BIND.
  • EPERM: The current process does not have superuser privileges.
  • ENODEV: The source_fd is not an open file descriptor to a valid filesystem inode.

All of the usual path resolution errors may also occur.

See also