Call fixup_sgx_enclu_exception() in the SIGSEGV and SIGBUS paths of the page fault handler immediately prior to signaling. If the fault is fixed, return cleanly and do not generate a signal.
In the SIGSEGV flow, make sure the error code passed to userspace has been sanitized. Cc: Andy Lutomirski <[email protected]> Cc: Jarkko Sakkinen <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Josh Triplett <[email protected]> Signed-off-by: Sean Christopherson <[email protected]> --- arch/x86/mm/fault.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 7e8a7558ca07..d3903965334c 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -28,6 +28,7 @@ #include <asm/mmu_context.h> /* vma_pkey() */ #include <asm/efi.h> /* efi_recover_from_page_fault()*/ #include <asm/desc.h> /* store_idt(), ... */ +#include <asm/sgx.h> /* fixup_sgx_enclu_exception() */ #define CREATE_TRACE_POINTS #include <asm/trace/exceptions.h> @@ -928,6 +929,9 @@ __bad_area_nosemaphore(struct pt_regs *regs, unsigned long error_code, if (address >= TASK_SIZE_MAX) error_code |= X86_PF_PROT; + if (fixup_sgx_enclu_exception(regs, X86_TRAP_PF, error_code, address)) + return; + if (likely(show_unhandled_signals)) show_signal_msg(regs, error_code, address, tsk); @@ -1045,6 +1049,9 @@ do_sigbus(struct pt_regs *regs, unsigned long error_code, unsigned long address, if (is_prefetch(regs, error_code, address)) return; + if (fixup_sgx_enclu_exception(regs, X86_TRAP_PF, error_code, address)) + return; + set_signal_archinfo(address, error_code); #ifdef CONFIG_MEMORY_FAILURE -- 2.19.2
