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| author | Gustavo A. R. Silva | 2018-10-16 16:32:40 +0200 |
|---|---|---|
| committer | Doug Ledford | 2018-10-16 17:32:40 +0200 |
| commit | 0295e39595e1146522f2722715dba7f7fba42217 (patch) | |
| tree | 705287d26046659b333c3d1fb06612f94d319584 /drivers/block/nbd.c | |
| parent | IB/mlx5: Unmap DMA addr from HCA before IOMMU (diff) | |
| download | kernel-qcow2-linux-0295e39595e1146522f2722715dba7f7fba42217.tar.gz kernel-qcow2-linux-0295e39595e1146522f2722715dba7f7fba42217.tar.xz kernel-qcow2-linux-0295e39595e1146522f2722715dba7f7fba42217.zip | |
IB/ucm: Fix Spectre v1 vulnerability
hdr.cmd can be indirectly controlled by user-space, hence leading to
a potential exploitation of the Spectre variant 1 vulnerability.
This issue was detected with the help of Smatch:
drivers/infiniband/core/ucm.c:1127 ib_ucm_write() warn: potential
spectre issue 'ucm_cmd_table' [r] (local cap)
Fix this by sanitizing hdr.cmd before using it to index
ucm_cmd_table.
Notice that given that speculation windows are large, the policy is
to kill the speculation on the first load and not worry if it can be
completed with a dependent load/store [1].
[1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2
Cc: stable@vger.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/block/nbd.c')
0 files changed, 0 insertions, 0 deletions