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RDMA/siw: Fix immediate work request flush to completion queue

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[ Upstream commit bdf1da5df9da680589a7f74448dd0a94dd3e1446 ]

Correctly set send queue element opcode during immediate work request
flushing in post sendqueue operation, if the QP is in ERROR state.
An undefined ocode value results in out-of-bounds access to an array
for mapping the opcode between siw internal and RDMA core representation
in work completion generation. It resulted in a KASAN BUG report
of type 'global-out-of-bounds' during NFSoRDMA testing.

This patch further fixes a potential case of a malicious user which may
write undefined values for completion queue elements status or opcode,
if the CQ is memory mapped to user land. It avoids the same out-of-bounds
access to arrays for status and opcode mapping as described above.

Fixes: 303ae1cdfd ("rdma/siw: application interface")
Fixes: b0fff7317b ("rdma/siw: completion queue methods")
Reported-by: Olga Kornievskaia <kolga@netapp.com>
Reviewed-by: Tom Talpey <tom@talpey.com>
Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
Link: https://lore.kernel.org/r/20221107145057.895747-1-bmt@zurich.ibm.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bernard Metzler 2022-11-07 15:50:57 +01:00 committed by Greg Kroah-Hartman
parent ef6079d98f
commit 6af043089d
2 changed files with 58 additions and 6 deletions
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24
drivers/infiniband/sw/siw/siw_cq.c
View File

@ -56,8 +56,6 @@ int siw_reap_cqe(struct siw_cq *cq, struct ib_wc *wc)
if (READ_ONCE(cqe->flags) & SIW_WQE_VALID) {
memset(wc, 0, sizeof(*wc));
wc->wr_id = cqe->id;
wc->status = map_cqe_status[cqe->status].ib;
wc->opcode = map_wc_opcode[cqe->opcode];
wc->byte_len = cqe->bytes;
/*
@ -71,10 +69,32 @@ int siw_reap_cqe(struct siw_cq *cq, struct ib_wc *wc)
wc->wc_flags = IB_WC_WITH_INVALIDATE;
}
wc->qp = cqe->base_qp;
wc->opcode = map_wc_opcode[cqe->opcode];
wc->status = map_cqe_status[cqe->status].ib;
siw_dbg_cq(cq,
"idx %u, type %d, flags %2x, id 0x%pK\n",
cq->cq_get % cq->num_cqe, cqe->opcode,
cqe->flags, (void *)(uintptr_t)cqe->id);
} else {
/*
* A malicious user may set invalid opcode or
* status in the user mmapped CQE array.
* Sanity check and correct values in that case
* to avoid out-of-bounds access to global arrays
* for opcode and status mapping.
*/
u8 opcode = cqe->opcode;
u16 status = cqe->status;
if (opcode >= SIW_NUM_OPCODES) {
opcode = 0;
status = IB_WC_GENERAL_ERR;
} else if (status >= SIW_NUM_WC_STATUS) {
status = IB_WC_GENERAL_ERR;
}
wc->opcode = map_wc_opcode[opcode];
wc->status = map_cqe_status[status].ib;
}
WRITE_ONCE(cqe->flags, 0);
cq->cq_get++;

38
drivers/infiniband/sw/siw/siw_verbs.c
View File

@ -694,13 +694,45 @@ static int siw_copy_inline_sgl(const struct ib_send_wr *core_wr,
static int siw_sq_flush_wr(struct siw_qp *qp, const struct ib_send_wr *wr,
const struct ib_send_wr **bad_wr)
{
struct siw_sqe sqe = {};
int rv = 0;
while (wr) {
struct siw_sqe sqe = {};
switch (wr->opcode) {
case IB_WR_RDMA_WRITE:
sqe.opcode = SIW_OP_WRITE;
break;
case IB_WR_RDMA_READ:
sqe.opcode = SIW_OP_READ;
break;
case IB_WR_RDMA_READ_WITH_INV:
sqe.opcode = SIW_OP_READ_LOCAL_INV;
break;
case IB_WR_SEND:
sqe.opcode = SIW_OP_SEND;
break;
case IB_WR_SEND_WITH_IMM:
sqe.opcode = SIW_OP_SEND_WITH_IMM;
break;
case IB_WR_SEND_WITH_INV:
sqe.opcode = SIW_OP_SEND_REMOTE_INV;
break;
case IB_WR_LOCAL_INV:
sqe.opcode = SIW_OP_INVAL_STAG;
break;
case IB_WR_REG_MR:
sqe.opcode = SIW_OP_REG_MR;
break;
default:
rv = -EINVAL;
break;
}
if (!rv) {
sqe.id = wr->wr_id;
sqe.opcode = wr->opcode;
rv = siw_sqe_complete(qp, &sqe, 0, SIW_WC_WR_FLUSH_ERR);
rv = siw_sqe_complete(qp, &sqe, 0,
SIW_WC_WR_FLUSH_ERR);
}
if (rv) {
if (bad_wr)
*bad_wr = wr;