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| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2018-07-16 20:59:58 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-07-18 13:31:15 -0700 |
| commit | 676bcfece19f83621e905aa55b5ed2d45cc4f2d3 (patch) | |
| tree | 13f086969b504b5518add7151478e6d415694517 /drivers | |
| parent | 107d01f5ba10f4162c38109496607eb197059064 (diff) | |
| download | linux-stable-676bcfece19f83621e905aa55b5ed2d45cc4f2d3.tar.gz linux-stable-676bcfece19f83621e905aa55b5ed2d45cc4f2d3.tar.bz2 linux-stable-676bcfece19f83621e905aa55b5ed2d45cc4f2d3.zip | |
net: cxgb3_main: fix potential Spectre v1
t.qset_idx 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/net/ethernet/chelsio/cxgb3/cxgb3_main.c:2286 cxgb_extension_ioctl()
warn: potential spectre issue 'adapter->msix_info'
Fix this by sanitizing t.qset_idx before using it to index
adapter->msix_info
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: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c index 7b795edd9d3a..a19172dbe6be 100644 --- a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c +++ b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c @@ -51,6 +51,7 @@ #include <linux/sched.h> #include <linux/slab.h> #include <linux/uaccess.h> +#include <linux/nospec.h> #include "common.h" #include "cxgb3_ioctl.h" @@ -2268,6 +2269,7 @@ static int cxgb_extension_ioctl(struct net_device *dev, void __user *useraddr) if (t.qset_idx >= nqsets) return -EINVAL; + t.qset_idx = array_index_nospec(t.qset_idx, nqsets); q = &adapter->params.sge.qset[q1 + t.qset_idx]; t.rspq_size = q->rspq_size; |