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Kernel/FS: Fix check-then-act concurrency bug in FileSystem/Inode

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When the FileSystem does a sync, it gathers up all the inodes with
dirty metadata into a vector. The inode mutex is not held while
checking the inode dirty bit, which can lead to a kernel panic
due to concurrent inode modifications.

Fixes: #21796
This commit is contained in:
Blake Smith
2023-11-19 19:15:37 -06:00
committed by Andreas Kling
parent 2372584b18
commit e346331424
2 changed files with 4 additions and 3 deletions
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3
Kernel/FileSystem/Ext2FS/Inode.cpp
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@@ -494,6 +494,9 @@ InodeMetadata Ext2FSInode::metadata() const
ErrorOr<void> Ext2FSInode::flush_metadata()
{
MutexLocker locker(m_inode_lock);
if (!is_metadata_dirty())
return {};
dbgln_if(EXT2_DEBUG, "Ext2FSInode[{}]::flush_metadata(): Flushing inode", identifier());
TRY(fs().write_ext2_inode(index(), m_raw_inode));
if (is_directory()) {