slub: avoid redzone when choosing freepointer location
Marco Elver reported system crashes when booting with "slub_debug=Z". The freepointer location (s->offset) was not taking into account that the "inuse" size that includes the redzone area should not be used by the freelist pointer. Change the calculation to save the area of the object that an inline freepointer may be written into. Fixes: 3202fa62 ("slub: relocate freelist pointer to middle of object") Reported-by: Marco Elver <elver@google.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Tested-by: Marco Elver <elver@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Link: http://lkml.kernel.org/r/202004151054.BD695840@keescook Link: https://lore.kernel.org/linux-mm/20200415164726.GA234932@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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