From c6827cd8b558a4fa191ad285bde4a17efdd758db Mon Sep 17 00:00:00 2001
From: Carlos Eduardo Seo <carlos.seo@arm.com>
Date: Thu, 17 Mar 2022 20:51:32 -0300
Subject: [PATCH] cheri: nptl: Check user provided stack for PCS constraints

In pthread_attr_setstack fail with EINVAL if the input stack does not
meet the PCS constraints.
---
 nptl/pthread_attr_setstack.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/nptl/pthread_attr_setstack.c b/nptl/pthread_attr_setstack.c
index e08b167df69..a0338c27528 100644
--- a/nptl/pthread_attr_setstack.c
+++ b/nptl/pthread_attr_setstack.c
@@ -19,7 +19,9 @@
 #include <limits.h>
 #include "pthreadP.h"
 #include <shlib-compat.h>
-
+#ifdef __CHERI_PURE_CAPABILITY__
+# include <cheri_perms.h>
+#endif
 
 #ifndef NEW_VERNUM
 # define NEW_VERNUM GLIBC_2_3_3
@@ -43,6 +45,11 @@ __pthread_attr_setstack (pthread_attr_t *attr, void *stackaddr,
   EXTRA_PARAM_CHECKS;
 #endif
 
+#ifdef __CHERI_PURE_CAPABILITY__
+  if (!STACK_CAP_CHECK (stackaddr, stacksize))
+    return EINVAL;
+#endif
+
   iattr->stacksize = stacksize;
 #if _STACK_GROWS_DOWN
   iattr->stackaddr = (char *) stackaddr + stacksize;
-- 
2.47.2