diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86_64/makecontext.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/makecontext.c | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/makecontext.c b/sysdeps/unix/sysv/linux/x86_64/makecontext.c index de9e03eb81..e4f025bd50 100644 --- a/sysdeps/unix/sysv/linux/x86_64/makecontext.c +++ b/sysdeps/unix/sysv/linux/x86_64/makecontext.c @@ -24,6 +24,7 @@ # include <pthread.h> # include <libc-pointer-arith.h> # include <sys/prctl.h> +# include <allocate-shadow-stack.h> #endif #include "ucontext_i.h" @@ -88,23 +89,24 @@ __makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...) if ((feature_1 & X86_FEATURE_1_SHSTK) != 0) { /* Shadow stack is enabled. We need to allocate a new shadow - stack. */ - unsigned long ssp_size = (((uintptr_t) sp - - (uintptr_t) ucp->uc_stack.ss_sp) - >> STACK_SIZE_TO_SHADOW_STACK_SIZE_SHIFT); - /* Align shadow stack to 8 bytes. */ - ssp_size = ALIGN_UP (ssp_size, 8); - - ucp->__ssp[1] = ssp_size; - ucp->__ssp[2] = ssp_size; - - /* Call __push___start_context to allocate a new shadow stack, - push __start_context onto the new stack as well as the new - shadow stack. NB: After __push___start_context returns, + stack. NB: ucp->__ssp[0]: The new shadow stack pointer. ucp->__ssp[1]: The base address of the new shadow stack. ucp->__ssp[2]: The size of the new shadow stack. */ + long int ret + = __allocate_shadow_stack (((uintptr_t) sp + - (uintptr_t) ucp->uc_stack.ss_sp), + &ucp->__ssp[1]); + if (ret != 0) + { + /* FIXME: What should we do? */ + abort (); + } + + ucp->__ssp[0] = ucp->__ssp[1] + ucp->__ssp[2] - 8; + /* Call __push___start_context to push __start_context onto the new + stack as well as the new shadow stack. */ __push___start_context (ucp); } else |