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Change History

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

ntfs3: fix uninit memory after failed mi_read in mi_format_new

Fix a KMSAN un-init bug found by syzkaller.

ntfs_get_bh() expects a buffer from sb_getblk(), that buffer may not be
uptodate. We do not bring the buffer uptodate before setting it as
uptodate. If the buffer were to not be uptodate, it could mean adding a
buffer with un-init data to the mi record. Attempting to load that record
will trigger KMSAN.

Avoid this by setting the buffer as uptodate, if it’s not already, by
overwriting it.

https://git.kernel.org/stable/c/46f2a881e5a7311d41551edb3915e4d4e8802341

https://git.kernel.org/stable/c/73e6b9dacf72a1e7a4265eacca46f8f33e0997d6

https://git.kernel.org/stable/c/7ce8f2028dfccb2161b905cf8ab85cdd9e93909c

https://git.kernel.org/stable/c/81ffe9a265df3e41534726b852ab08792e3d374d