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Message-Id: <20221214202046.719598-1-pgonda@google.com>
Date: Wed, 14 Dec 2022 12:20:46 -0800
From: Peter Gonda <pgonda@...gle.com>
To: herbert@...dor.apana.org.au
Cc: Peter Gonda <pgonda@...gle.com>, Andy Nguyen <theflow@...gle.com>,
David Rientjes <rientjes@...gle.com>, stable@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
John Allen <john.allen@....com>,
"Thomas . Lendacky" <thomas.lendacky@....com>
Subject: [PATCH] crypto: ccp - Limit memory allocation in SEV_GET_ID2 ioctl
Currently userspace can ask for any uint32 size allocation for the
SEV_GET_ID2. Limit this allocation size to the max physically
contiguously allocation: MAX_ORDER.
Reported-by: Andy Nguyen <theflow@...gle.com>
Suggested-by: David Rientjes <rientjes@...gle.com>
Signed-off-by: Peter Gonda <pgonda@...gle.com>
Cc: stable@...r.kernel.org
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: linux-kernel@...r.kernel.org
Cc: linux-crypto@...r.kernel.org
Cc: John Allen <john.allen@....com>
Cc: Thomas.Lendacky <thomas.lendacky@....com>
---
drivers/crypto/ccp/sev-dev.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 06fc7156c04f..5c16c4406764 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -878,6 +878,10 @@ static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
return -EFAULT;
+ /* Max length that can be allocated physically contiguously */
+ if (get_order(input.length) >= MAX_ORDER)
+ return -ENOMEM;
+
input_address = (void __user *)input.address;
if (input.address && input.length) {
--
2.39.0.rc1.256.g54fd8350bd-goog
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