* [PATCH 4.14-stable 1/2] IB/qib: Use struct_size() helper
2021-11-04 13:55 [PATCH 4.14-stable 0/2] Port upstream patch mike.marciniszyn
@ 2021-11-04 13:55 ` mike.marciniszyn
2021-11-04 13:55 ` [PATCH 4.14-stable 2/2] IB/qib: Protect from buffer overflow in struct qib_user_sdma_pkt fields mike.marciniszyn
2021-11-04 14:11 ` [PATCH 4.14-stable 0/2] Port upstream patch Greg KH
2 siblings, 0 replies; 4+ messages in thread
From: mike.marciniszyn @ 2021-11-04 13:55 UTC (permalink / raw)
To: stable; +Cc: linux-rdma, Gustavo A. R. Silva, Mike Marciniszyn,
Jason Gunthorpe
From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
upstream commit 829ca44ecf60e9b6f83d0161a6ef10c1304c5060.
[Apply to 4.14.x]
Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes, in particular in the
context in which this code is being used.
So, replace the following form:
sizeof(*pkt) + sizeof(pkt->addr[0])*n
with:
struct_size(pkt, addr, n)
Also, notice that variable size is unnecessary, hence it is removed.
This code was detected with the help of Coccinelle.
Backport notes:
- Needed to include linux/overflow.h
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
---
drivers/infiniband/hw/qib/qib_user_sdma.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/hw/qib/qib_user_sdma.c b/drivers/infiniband/hw/qib/qib_user_sdma.c
index 926f3c8..ffb4257 100644
--- a/drivers/infiniband/hw/qib/qib_user_sdma.c
+++ b/drivers/infiniband/hw/qib/qib_user_sdma.c
@@ -41,6 +41,7 @@
#include <linux/rbtree.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
+#include <linux/overflow.h>
#include "qib.h"
#include "qib_user_sdma.h"
@@ -908,10 +909,11 @@ static int qib_user_sdma_queue_pkts(const struct qib_devdata *dd,
}
if (frag_size) {
- int pktsize, tidsmsize, n;
+ int tidsmsize, n;
+ size_t pktsize;
n = npages*((2*PAGE_SIZE/frag_size)+1);
- pktsize = sizeof(*pkt) + sizeof(pkt->addr[0])*n;
+ pktsize = struct_size(pkt, addr, n);
/*
* Determine if this is tid-sdma or just sdma.
--
1.8.3.1
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH 4.14-stable 2/2] IB/qib: Protect from buffer overflow in struct qib_user_sdma_pkt fields
2021-11-04 13:55 [PATCH 4.14-stable 0/2] Port upstream patch mike.marciniszyn
2021-11-04 13:55 ` [PATCH 4.14-stable 1/2] IB/qib: Use struct_size() helper mike.marciniszyn
@ 2021-11-04 13:55 ` mike.marciniszyn
2021-11-04 14:11 ` [PATCH 4.14-stable 0/2] Port upstream patch Greg KH
2 siblings, 0 replies; 4+ messages in thread
From: mike.marciniszyn @ 2021-11-04 13:55 UTC (permalink / raw)
To: stable; +Cc: linux-rdma, Mike Marciniszyn, Dennis Dalessandro, Jason Gunthorpe
From: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
upstream commit d39bf40e55e666b5905fdbd46a0dced030ce87be.
[Apply to 4.14.x]
Overflowing either addrlimit or bytes_togo can allow userspace to trigger
a buffer overflow of kernel memory. Check for overflows in all the places
doing math on user controlled buffers.
Fixes: f931551bafe1 ("IB/qib: Add new qib driver for QLogic PCIe InfiniBand adapters")
Link: https://lore.kernel.org/r/20211012175519.7298.77738.stgit@awfm-01.cornelisnetworks.com
Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
drivers/infiniband/hw/qib/qib_user_sdma.c | 33 +++++++++++++++++++++----------
1 file changed, 23 insertions(+), 10 deletions(-)
diff --git a/drivers/infiniband/hw/qib/qib_user_sdma.c b/drivers/infiniband/hw/qib/qib_user_sdma.c
index ffb4257..42329bb 100644
--- a/drivers/infiniband/hw/qib/qib_user_sdma.c
+++ b/drivers/infiniband/hw/qib/qib_user_sdma.c
@@ -607,7 +607,7 @@ static int qib_user_sdma_coalesce(const struct qib_devdata *dd,
/*
* How many pages in this iovec element?
*/
-static int qib_user_sdma_num_pages(const struct iovec *iov)
+static size_t qib_user_sdma_num_pages(const struct iovec *iov)
{
const unsigned long addr = (unsigned long) iov->iov_base;
const unsigned long len = iov->iov_len;
@@ -663,7 +663,7 @@ static void qib_user_sdma_free_pkt_frag(struct device *dev,
static int qib_user_sdma_pin_pages(const struct qib_devdata *dd,
struct qib_user_sdma_queue *pq,
struct qib_user_sdma_pkt *pkt,
- unsigned long addr, int tlen, int npages)
+ unsigned long addr, int tlen, size_t npages)
{
struct page *pages[8];
int i, j;
@@ -727,7 +727,7 @@ static int qib_user_sdma_pin_pkt(const struct qib_devdata *dd,
unsigned long idx;
for (idx = 0; idx < niov; idx++) {
- const int npages = qib_user_sdma_num_pages(iov + idx);
+ const size_t npages = qib_user_sdma_num_pages(iov + idx);
const unsigned long addr = (unsigned long) iov[idx].iov_base;
ret = qib_user_sdma_pin_pages(dd, pq, pkt, addr,
@@ -829,8 +829,8 @@ static int qib_user_sdma_queue_pkts(const struct qib_devdata *dd,
unsigned pktnw;
unsigned pktnwc;
int nfrags = 0;
- int npages = 0;
- int bytes_togo = 0;
+ size_t npages = 0;
+ size_t bytes_togo = 0;
int tiddma = 0;
int cfur;
@@ -890,7 +890,11 @@ static int qib_user_sdma_queue_pkts(const struct qib_devdata *dd,
npages += qib_user_sdma_num_pages(&iov[idx]);
- bytes_togo += slen;
+ if (check_add_overflow(bytes_togo, slen, &bytes_togo) ||
+ bytes_togo > type_max(typeof(pkt->bytes_togo))) {
+ ret = -EINVAL;
+ goto free_pbc;
+ }
pktnwc += slen >> 2;
idx++;
nfrags++;
@@ -909,8 +913,7 @@ static int qib_user_sdma_queue_pkts(const struct qib_devdata *dd,
}
if (frag_size) {
- int tidsmsize, n;
- size_t pktsize;
+ size_t tidsmsize, n, pktsize, sz, addrlimit;
n = npages*((2*PAGE_SIZE/frag_size)+1);
pktsize = struct_size(pkt, addr, n);
@@ -928,14 +931,24 @@ static int qib_user_sdma_queue_pkts(const struct qib_devdata *dd,
else
tidsmsize = 0;
- pkt = kmalloc(pktsize+tidsmsize, GFP_KERNEL);
+ if (check_add_overflow(pktsize, tidsmsize, &sz)) {
+ ret = -EINVAL;
+ goto free_pbc;
+ }
+ pkt = kmalloc(sz, GFP_KERNEL);
if (!pkt) {
ret = -ENOMEM;
goto free_pbc;
}
pkt->largepkt = 1;
pkt->frag_size = frag_size;
- pkt->addrlimit = n + ARRAY_SIZE(pkt->addr);
+ if (check_add_overflow(n, ARRAY_SIZE(pkt->addr),
+ &addrlimit) ||
+ addrlimit > type_max(typeof(pkt->addrlimit))) {
+ ret = -EINVAL;
+ goto free_pbc;
+ }
+ pkt->addrlimit = addrlimit;
if (tiddma) {
char *tidsm = (char *)pkt + pktsize;
--
1.8.3.1
^ permalink raw reply related [flat|nested] 4+ messages in thread