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Kernel+Userland: Split bind-mounting and re-mounting from mount syscall

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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.
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Liav A 2023-02-25 19:30:28 +02:00 • committed by Andrew Kaster
parent 04b44a827a
commit 0bbd9040ef
10 changed files with 204 additions and 42 deletions
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39
Base/usr/share/man/man2/bindmount.md Normal file
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## Name
bindmount - create a bindmount from `source_fd` to a target path.
## Synopsis
```**c++
#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
* [`mount`(2)](help://man/2/mount)