Use the kernel's virtual address to reference the source page when EADDing a page to the enclave. gup() "does not guarantee that the page exists in the user mappings", i.e. EADD can still fault and deadlock due to mmap_sem contention if it consumes the userspace address. Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx> --- arch/x86/kernel/cpu/sgx/ioctl.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c b/arch/x86/kernel/cpu/sgx/ioctl.c index bb8fcc4f91e3..2dd0eceee111 100644 --- a/arch/x86/kernel/cpu/sgx/ioctl.c +++ b/arch/x86/kernel/cpu/sgx/ioctl.c @@ -328,16 +328,14 @@ static int __sgx_encl_add_page(struct sgx_encl *encl, if (ret < 1) return ret; - __uaccess_begin(); - pginfo.secs = (unsigned long)sgx_epc_addr(encl->secs.epc_page); pginfo.addr = SGX_ENCL_PAGE_ADDR(encl_page); pginfo.metadata = (unsigned long)secinfo; - pginfo.contents = (unsigned long)src; + pginfo.contents = (unsigned long)kmap_atomic(src_page); ret = __eadd(&pginfo, sgx_epc_addr(epc_page)); - __uaccess_end(); + kunmap_atomic((void *)pginfo.contents); put_page(src_page); return ret ? -EFAULT : 0; -- 2.22.0
