Commit f0861f49 authored by Borys Popławski's avatar Borys Popławski Committed by Borislav Petkov
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x86/sgx: Add overflow check in sgx_validate_offset_length() 



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: c6d26d37 ("x86/sgx: Add SGX_IOC_ENCLAVE_ADD_PAGES")
Signed-off-by: default avatarBorys Popławski <borysp@invisiblethingslab.com>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Reviewed-by: default avatarJarkko Sakkinen <jarkko@kernel.org>
Cc: stable@vger.kernel.org # v5.11+
Link: https://lore.kernel.org/r/0d91ac79-6d84-abed-5821-4dbe59fa1a38@invisiblethingslab.com
parent f0c4d9fc

arch/x86/kernel/cpu/sgx/ioctl.c

+3 −0
Original line number Diff line number Diff line
@@ -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;