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%3Ba=su...
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@vger.kernel.org know about it.
From foo@baz Thu Mar 22 14:57:32 CET 2018
From: Vlad Tsyrklevich vlad@tsyrklevich.net Date: Fri, 24 Mar 2017 15:55:17 -0400 Subject: infiniband/uverbs: Fix integer overflows
From: Vlad Tsyrklevich vlad@tsyrklevich.net
[ 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@tsyrklevich.net Signed-off-by: Doug Ledford dledford@redhat.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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@tsyrklevich.net are
queue-4.4/infiniband-uverbs-fix-integer-overflows.patch