This is a note to let you know that I've just added the patch titled
infiniband/uverbs: Fix integer overflows
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
infiniband-uverbs-fix-integer-overflows.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Mar 22 14:57:32 CET 2018
From: Vlad Tsyrklevich <vlad@xxxxxxxxxxxxxxx>
Date: Fri, 24 Mar 2017 15:55:17 -0400
Subject: infiniband/uverbs: Fix integer overflows
From: Vlad Tsyrklevich <vlad@xxxxxxxxxxxxxxx>
[ Upstream commit 4f7f4dcfff2c19debbcdbcc861c325610a15e0c5 ]
The 'num_sge' variable is verfied to be smaller than the 'sge_count'
variable; however, since both are user-controlled it's possible to cause
an integer overflow for the kmalloc multiply on 32-bit platforms
(num_sge and sge_count are both defined u32). By crafting an input that
causes a smaller-than-expected allocation it's possible to write
controlled data out-of-bounds.
Signed-off-by: Vlad Tsyrklevich <vlad@xxxxxxxxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/core/uverbs_cmd.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -2436,9 +2436,13 @@ ssize_t ib_uverbs_destroy_qp(struct ib_u
static void *alloc_wr(size_t wr_size, __u32 num_sge)
{
+ if (num_sge >= (U32_MAX - ALIGN(wr_size, sizeof (struct ib_sge))) /
+ sizeof (struct ib_sge))
+ return NULL;
+
return kmalloc(ALIGN(wr_size, sizeof (struct ib_sge)) +
num_sge * sizeof (struct ib_sge), GFP_KERNEL);
-};
+}
ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
struct ib_device *ib_dev,
@@ -2664,6 +2668,13 @@ static struct ib_recv_wr *ib_uverbs_unma
ret = -EINVAL;
goto err;
}
+
+ if (user_wr->num_sge >=
+ (U32_MAX - ALIGN(sizeof *next, sizeof (struct ib_sge))) /
+ sizeof (struct ib_sge)) {
+ ret = -EINVAL;
+ goto err;
+ }
next = kmalloc(ALIGN(sizeof *next, sizeof (struct ib_sge)) +
user_wr->num_sge * sizeof (struct ib_sge),
Patches currently in stable-queue which might be from vlad@xxxxxxxxxxxxxxx are
queue-4.4/infiniband-uverbs-fix-integer-overflows.patch