The following commit has been merged into the x86/urgent branch of tip:

Commit-ID: f0861f49bd946ff94fce4f82509c45e167f63690 Gitweb: https://git.kernel.org/tip/f0861f49bd946ff94fce4f82509c45e167f63690 Author: Borys Popławski borysp@invisiblethingslab.com AuthorDate: Wed, 05 Oct 2022 00:59:03 +02:00 Committer: Borislav Petkov bp@suse.de CommitterDate: Tue, 08 Nov 2022 20:34:05 +01:00

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: 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... --- arch/x86/kernel/cpu/sgx/ioctl.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c b/arch/x86/kernel/cpu/sgx/ioctl.c index ebe79d6..da8b8ea 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;