On 1/31/21 12:29 PM, Miroslav Lachman wrote:
Several file systems were not properly initializing the d_off field of
the dirent structures returned by VOP_READDIR. In particular, tmpfs(5),
smbfs(5), autofs(5) and mqueuefs(5) were failing to do so. As a result,
eight uninitialized kernel stack bytes may be leaked to userspace by
these file systems. This problem is not present in FreeBSD 11.
There is a Corrected in: stable/11, 11.4-STABLE and releng/11.4,
11.4-RELEASE-p7, but later is a statement "This problem is not present
in FreeBSD 11".
What is true? Is it fixed in newer patchlevel of FreeBSD 11.4 or it was
not present in 11.x at all?
My understanding is that the problem described in that paragraph does
not affect 11.x, but the next one does (and is "Corrected...").
I.e. 11.x is affected by:
Additionally, msdosfs(5) was failing to zero-fill a pair of padding
fields in the dirent structure, resulting in a leak of three
uninitialized bytes.
Is that right?
bye
av.
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