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IB/ucm: Fix Spectre v1 vulnerability

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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>
This commit is contained in:
Gustavo A. R. Silva 2018-10-16 16:32:40 +02:00 committed by Doug Ledford
parent dd9a403495
commit 0295e39595
1 changed files with 3 additions and 0 deletions
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3
drivers/infiniband/core/ucm.c
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@ -46,6 +46,8 @@
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/nospec.h>
#include <linux/uaccess.h>
#include <rdma/ib.h>
@ -1120,6 +1122,7 @@ static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
if (hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
return -EINVAL;
hdr.cmd = array_index_nospec(hdr.cmd, ARRAY_SIZE(ucm_cmd_table));
if (hdr.in + sizeof(hdr) > len)
return -EINVAL;