The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

Possible dependencies:

f0861f49bd94 ("x86/sgx: Add overflow check in sgx_validate_offset_length()") dda03e2c331b ("x86/sgx: Create utility to validate user provided offset and length")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f0861f49bd946ff94fce4f82509c45e167f63690 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Borys=20Pop=C5=82awski?= borysp@invisiblethingslab.com Date: Wed, 5 Oct 2022 00:59:03 +0200 Subject: [PATCH] x86/sgx: Add overflow check in sgx_validate_offset_length() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

sgx_validate_offset_length() function verifies "offset" and "length" arguments provided by userspace, but was missing an overflow check on their addition. Add it.

Fixes: c6d26d370767 ("x86/sgx: Add SGX_IOC_ENCLAVE_ADD_PAGES") Signed-off-by: Borys Popławski borysp@invisiblethingslab.com Signed-off-by: Borislav Petkov bp@suse.de Reviewed-by: Jarkko Sakkinen jarkko@kernel.org Cc: stable@vger.kernel.org # v5.11+ Link: https://lore.kernel.org/r/0d91ac79-6d84-abed-5821-4dbe59fa1a38@invisiblethin...

diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c b/arch/x86/kernel/cpu/sgx/ioctl.c index ebe79d60619f..da8b8ea6b063 100644 --- a/arch/x86/kernel/cpu/sgx/ioctl.c +++ b/arch/x86/kernel/cpu/sgx/ioctl.c @@ -356,6 +356,9 @@ static int sgx_validate_offset_length(struct sgx_encl *encl, if (!length || !IS_ALIGNED(length, PAGE_SIZE)) return -EINVAL;

+ if (offset + length < offset) + return -EINVAL; + if (offset + length - PAGE_SIZE >= encl->size) return -EINVAL;