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Ext2FS: Trying to create a too-long directory entry should ENAMETOOLONG

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Also added some assertions to DirectoryEntry in case someone tries to
instantiate them with names that would overflow the name buffer.

DirectoryEntry is a crappy data structure, and the name buffer is also
crappy. Added a FIXME about replacing it with something nicer.

Before this patch, the DirectoryEntry::name buffer would overflow if
you did "touch extremely-long-file-name". Duh.

Fixes #538.
This commit is contained in:
Andreas Kling 2019-09-10 21:04:27 +02:00
parent ada1f504fd
commit b9be6b7bb4
Notes: sideshowbarker 2024-07-19 12:09:54 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/b9be6b7bb48
3 changed files with 6 additions and 0 deletions
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3
Kernel/FileSystem/Ext2FileSystem.cpp
View file

@ -767,6 +767,9 @@ KResult Ext2FSInode::add_child(InodeIdentifier child_id, const StringView& name,
LOCKER(m_lock);
ASSERT(is_directory());
if (name.length() > EXT2_NAME_LEN)
return KResult(-ENAMETOOLONG);
#ifdef EXT2_DEBUG
dbg() << "Ext2FSInode::add_child(): Adding inode " << child_id.index() << " with name '" << name << " and mode " << mode << " to directory " << index();
#endif

2
Kernel/FileSystem/FileSystem.cpp
View file

@ -41,6 +41,7 @@ FS::DirectoryEntry::DirectoryEntry(const char* n, InodeIdentifier i, u8 ft)
, inode(i)
, file_type(ft)
{
ASSERT(name_length < (int)sizeof(name));
memcpy(name, n, name_length);
name[name_length] = '\0';
}
@ -50,6 +51,7 @@ FS::DirectoryEntry::DirectoryEntry(const char* n, int nl, InodeIdentifier i, u8
, inode(i)
, file_type(ft)
{
ASSERT(name_length < (int)sizeof(name));
memcpy(name, n, nl);
name[nl] = '\0';
}

1
Kernel/FileSystem/FileSystem.h
View file

@ -47,6 +47,7 @@ public:
virtual KResult prepare_to_unmount() const { return KSuccess; }
// FIXME: This data structure is very clunky and unpleasant. Replace it with something nicer.
struct DirectoryEntry {
DirectoryEntry(const char* name, InodeIdentifier, u8 file_type);
DirectoryEntry(const char* name, int name_length, InodeIdentifier, u8 file_type);