> Structure ib_uverbs_qp_attr is copied to userland with allmost all
> fields uninitialized (140 bytes on x86). It leads to leaking of
> contents of kernel stack memory.
I don't think most of the fields are uninitialized... we have:
memset(&qp_attr, 0, sizeof qp_attr);
and then later on,
ib_copy_qp_attr_to_user(&resp, &qp_attr);
which actually does initialize almost all of the fields in resp. The
things that are missing are clearing out the reserved fields in the
structures, and also resp.qp_state never gets set.
I would suggest adding code to clear the reserved fields of structures
to ib_copy_qp_attr_to_user() and ib_copy_ah_attr_to_user(), since this
will fix what looks to be the same problem in ucma_init_qp_attr() (in
drivers/infiniband/core/ucma.c).
Sean, what is intended for qp_state handling here? It seems
ib_copy_qp_attr_to_user() should either clear it or set it to something
sensible.
- R.
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