[Bug 204097] witness_initialize() does not perform bound checking of witness_count

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Tue Nov 10 21:29:49 UTC 2015


Benjamin Kaduk <bjk at FreeBSD.org> changed:

           What    |Removed                     |Added
                 CC|                            |bjk at FreeBSD.org

--- Comment #1 from Benjamin Kaduk <bjk at FreeBSD.org> ---
Changing 'i' to be of type size_t would be a more architecturally pleasing
change, if a change is needed here.

I see some argument for anti-foot-shooting here, but it is not a particularly
strong one -- such a large value of witness_count seems unlikely to lead to a
usable system anyway, so it is not reasonable for an administrator to want to
set such a value.  There are many, many ways in which tunables can be (ab)used
to create a broken system and panics, and it's not reasonable to put in
anti-foot-shooting measures for all of them, particularly the ones where there
is not a reasonable reason to want to set such values in the first place.

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