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Kernel+Userland: Add symlink() syscall and add "-s" flag to /bin/ln.

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It's now possible to create symbolic links! :^)

This exposed an issue in Ext2FS where we'd write uninitialized data past
the end of an inode's content. Fix this by zeroing out the tail end of
the last block in a file.
This commit is contained in:
Andreas Kling
2019-03-02 01:50:34 +01:00
parent 37f6844c6c
commit 2c5a378ccc
10 changed files with 106 additions and 12 deletions
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25
Kernel/VirtualFileSystem.cpp
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@@ -431,6 +431,31 @@ KResult VFS::unlink(const String& path, Inode& base)
return parent_inode->remove_child(FileSystemPath(path).basename());
}
KResult VFS::symlink(const String& target, const String& linkpath, Inode& base)
{
RetainPtr<Inode> parent_inode;
auto existing_file_or_error = resolve_path_to_inode(linkpath, base, &parent_inode);
if (!existing_file_or_error.is_error())
return KResult(-EEXIST);
if (!parent_inode)
return KResult(-ENOENT);
if (existing_file_or_error.error() != -ENOENT)
return existing_file_or_error.error();
if (!parent_inode->metadata().may_write(*current))
return KResult(-EACCES);
FileSystemPath p(linkpath);
dbgprintf("VFS::symlink: '%s' (-> '%s') in %u:%u\n", p.basename().characters(), target.characters(), parent_inode->fsid(), parent_inode->index());
int error;
auto new_file = parent_inode->fs().create_inode(parent_inode->identifier(), p.basename(), 0120644, 0, error);
if (!new_file)
return KResult(error);
ssize_t nwritten = new_file->write_bytes(0, target.length(), (const byte*)target.characters(), nullptr);
if (nwritten < 0)
return KResult(nwritten);
return KSuccess;
}
KResult VFS::rmdir(const String& path, Inode& base)
{
RetainPtr<Inode> parent_inode;