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Shutemov" , Wei Liu , Sasha Levin Subject: [PATCH 6.1 0615/1887] hv_netvsc: Dont free decrypted memory Date: Wed, 28 Oct 2026 17:45:11 +0100 Message-ID: <20261028170513.406281565@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261028170459.200466217@linuxfoundation.org> References: <20261028170459.200466217@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Rick Edgecombe [ Upstream commit bbf9ac34677b57506a13682b31a2a718934c0e31 ] In CoCo VMs it is possible for the untrusted host to cause set_memory_encrypted() or set_memory_decrypted() to fail such that an error is returned and the resulting memory is shared. Callers need to take care to handle these errors to avoid returning decrypted (shared) memory to the page allocator, which could lead to functional or security issues. The netvsc driver could free decrypted/shared pages if set_memory_decrypted() fails. Check the decrypted field in the gpadl to decide whether to free the memory. Signed-off-by: Rick Edgecombe Signed-off-by: Michael Kelley Reviewed-by: Kuppuswamy Sathyanarayanan Acked-by: Kirill A. Shutemov Link: https://lore.kernel.org/r/20240311161558.1310-4-mhklinux@outlook.com Signed-off-by: Wei Liu Message-ID: <20240311161558.1310-4-mhklinux@outlook.com> Signed-off-by: Sasha Levin --- drivers/net/hyperv/netvsc.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index 077595b42d4a7..e17c6dadfef86 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -156,15 +156,19 @@ static void free_netvsc_device(struct rcu_head *head) kfree(nvdev->extension); - if (nvdev->recv_original_buf) - vfree(nvdev->recv_original_buf); - else - vfree(nvdev->recv_buf); + if (!nvdev->recv_buf_gpadl_handle.decrypted) { + if (nvdev->recv_original_buf) + vfree(nvdev->recv_original_buf); + else + vfree(nvdev->recv_buf); + } - if (nvdev->send_original_buf) - vfree(nvdev->send_original_buf); - else - vfree(nvdev->send_buf); + if (!nvdev->send_buf_gpadl_handle.decrypted) { + if (nvdev->send_original_buf) + vfree(nvdev->send_original_buf); + else + vfree(nvdev->send_buf); + } bitmap_free(nvdev->send_section_map); -- 2.53.0