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authorFaisal Latif <faisal.latif@intel.com>2009-03-12 14:34:59 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-03-12 16:21:41 -0700
commitc12e56ef6951f4fce1afe9ef6aab9243ea9a9b04 (patch)
tree677319ae34074efbf98a87d9496a7d5cb47c0524 /drivers/infiniband/hw/nes/nes_verbs.h
parent7ef0d7377cb287e08f3ae94cebc919448e1f5dff (diff)
RDMA/nes: Don't allow userspace QPs to use STag zero
STag zero is a special STag that allows consumers to access any bus address without registering memory. The nes driver unfortunately allows STag zero to be used even with QPs created by unprivileged userspace consumers, which means that any process with direct verbs access to the nes device can read and write any memory accessible to the underlying PCI device (usually any memory in the system). Such access is usually given for cluster software such as MPI to use, so this is a local privilege escalation bug on most systems running this driver. The driver was using STag zero to receive the last streaming mode data; to allow STag zero to be disabled for unprivileged QPs, the driver now registers a special MR for this data. Cc: <stable@kernel.org> Signed-off-by: Faisal Latif <faisal.latif@intel.com> Signed-off-by: Roland Dreier <rolandd@cisco.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/infiniband/hw/nes/nes_verbs.h')
-rw-r--r--drivers/infiniband/hw/nes/nes_verbs.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/nes/nes_verbs.h b/drivers/infiniband/hw/nes/nes_verbs.h
index 6c6b4da5184f..ae0ca9bc83bd 100644
--- a/drivers/infiniband/hw/nes/nes_verbs.h
+++ b/drivers/infiniband/hw/nes/nes_verbs.h
@@ -134,6 +134,7 @@ struct nes_qp {
struct ietf_mpa_frame *ietf_frame;
dma_addr_t ietf_frame_pbase;
wait_queue_head_t state_waitq;
+ struct ib_mr *lsmm_mr;
unsigned long socket;
struct nes_hw_qp hwqp;
struct work_struct work;