35 lines
1.1 KiB
Diff
35 lines
1.1 KiB
Diff
From: Mohamed Ghannam <simo.ghannam@gmail.com>
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Date: Tue, 2 Jan 2018 19:44:34 +0000
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Subject: RDS: Heap OOB write in rds_message_alloc_sgs()
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Origin: https://git.kernel.org/linus/c095508770aebf1b9218e77026e48345d719b17c
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Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2018-5332
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When args->nr_local is 0, nr_pages gets also 0 due some size
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calculation via rds_rm_size(), which is later used to allocate
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pages for DMA, this bug produces a heap Out-Of-Bound write access
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to a specific memory region.
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Signed-off-by: Mohamed Ghannam <simo.ghannam@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/rds/rdma.c | 3 +++
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1 file changed, 3 insertions(+)
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diff --git a/net/rds/rdma.c b/net/rds/rdma.c
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index bc2f1e0977d6..94729d9da437 100644
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--- a/net/rds/rdma.c
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+++ b/net/rds/rdma.c
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@@ -525,6 +525,9 @@ int rds_rdma_extra_size(struct rds_rdma_args *args)
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local_vec = (struct rds_iovec __user *)(unsigned long) args->local_vec_addr;
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+ if (args->nr_local == 0)
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+ return -EINVAL;
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+
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/* figure out the number of pages in the vector */
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for (i = 0; i < args->nr_local; i++) {
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if (copy_from_user(&vec, &local_vec[i],
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--
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2.15.1
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