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Kernel+Base: Mount root as nodev,nosuid

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Then bind-mount /dev and /bin while adding back the appropriate permissions :^)
This commit is contained in:
Sergey Bugaev 2020-01-12 19:40:50 +03:00 committed by Andreas Kling
parent 1a55264fe6
commit fee6d0a3a6
Notes: sideshowbarker 2024-07-19 10:07:11 +09:00 
Author: https://github.com/bugaevc
Commit: https://github.com/SerenityOS/serenity/commit/fee6d0a3a6a
Pull-request: https://github.com/SerenityOS/serenity/pull/1063
2 changed files with 9 additions and 3 deletions
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8
Base/etc/fstab
View file

@ -1,4 +1,10 @@
/dev/hda / ext2
# Root file system. This is a fake entry which gets ignored by `mount -a`;
# the actual logic for mounting root is in the kernel.
/dev/hda / ext2 nodev,nosuid
# Remount /bin and /dev while adding the appropriate permissions.
/dev /dev bind bind,nosuid
/bin /bin bind bind,nodev
proc /proc proc nosuid
devpts /dev/pts devpts noexec,nosuid
tmp /tmp tmp nodev,nosuid

4
Kernel/FileSystem/VirtualFileSystem.cpp
View file

@ -89,7 +89,7 @@ bool VFS::mount_root(FS& file_system)
return false;
}
Mount mount { file_system, nullptr, 0 };
Mount mount { file_system, nullptr, MS_NODEV | MS_NOSUID };
auto root_inode_id = mount.guest().fs()->root_inode();
auto root_inode = mount.guest().fs()->get_inode(root_inode_id);
@ -668,7 +668,7 @@ void VFS::sync()
Custody& VFS::root_custody()
{
if (!m_root_custody)
m_root_custody = Custody::create(nullptr, "", *m_root_inode, 0);
m_root_custody = Custody::create(nullptr, "", *m_root_inode, MS_NODEV | MS_NOSUID);
return *m_root_custody;
}