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Vulnerability Change Records for CVE-2024-53130

Change History

New CVE Received from kernel.org 12/04/2024 10:15:12 AM

Action Type Old Value New Value
Added Description

								
							
							
						
In the Linux kernel, the following vulnerability has been resolved:

nilfs2: fix null-ptr-deref in block_dirty_buffer tracepoint

When using the "block:block_dirty_buffer" tracepoint, mark_buffer_dirty()
may cause a NULL pointer dereference, or a general protection fault when
KASAN is enabled.

This happens because, since the tracepoint was added in
mark_buffer_dirty(), it references the dev_t member bh->b_bdev->bd_dev
regardless of whether the buffer head has a pointer to a block_device
structure.

In the current implementation, nilfs_grab_buffer(), which grabs a buffer
to read (or create) a block of metadata, including b-tree node blocks,
does not set the block device, but instead does so only if the buffer is
not in the "uptodate" state for each of its caller block reading
functions.  However, if the uptodate flag is set on a folio/page, and the
buffer heads are detached from it by try_to_free_buffers(), and new buffer
heads are then attached by create_empty_buffers(), the uptodate flag may
be restored to each buffer without the block device being set to
bh->b_bdev, and mark_buffer_dirty() may be called later in that state,
resulting in the bug mentioned above.

Fix this issue by making nilfs_grab_buffer() always set the block device
of the super block structure to the buffer head, regardless of the state
of the buffer's uptodate flag.
Added Reference

								
							
							
						
https://git.kernel.org/stable/c/2026559a6c4ce34db117d2db8f710fe2a9420d5a
Added Reference

								
							
							
						
https://git.kernel.org/stable/c/86b19031dbc79abc378dfae357f6ea33ebeb0c95
Added Reference

								
							
							
						
https://git.kernel.org/stable/c/b0e4765740040c44039282057ecacd7435d1d2ba
Added Reference

								
							
							
						
https://git.kernel.org/stable/c/ffc440a76a0f476a7e6ea838ec0dc8e9979944d1