From 72e615009bfde798692487d04ae548d15eb423ba Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Fri, 18 Jun 2004 02:40:54 +0000
Subject: [PATCH] Update.

2004-06-15  Steven Munroe  <sjmunroe@us.ibm.com>

	* tst-context1.c (GUARD_PATTERN): Defined.
	(tst_context_t): Define struct containing ucontext_t & guard words.
	(ctx): Declare as an array of tst_context_t.
	(fct): Verify uc_link & guard words are still valid.
	(tf): Initialize guard words in ctx.  Adjust ctx refs for new struct.
---
 nptl/ChangeLog      |  8 +++++++
 nptl/tst-context1.c | 56 ++++++++++++++++++++++++++++++++++++++-------
 sunrpc/pmap_prot2.c |  6 ++---
 3 files changed, 59 insertions(+), 11 deletions(-)

diff --git a/nptl/ChangeLog b/nptl/ChangeLog
index 71c89ddd1f..a835cf669a 100644
--- a/nptl/ChangeLog
+++ b/nptl/ChangeLog
@@ -1,3 +1,11 @@
+2004-06-15  Steven Munroe  <sjmunroe@us.ibm.com>
+
+	* tst-context1.c (GUARD_PATTERN): Defined.
+	(tst_context_t): Define struct containing ucontext_t & guard words.
+	(ctx): Declare as an array of tst_context_t.
+	(fct): Verify uc_link & guard words are still valid.
+	(tf): Initialize guard words in ctx.  Adjust ctx refs for new struct.
+
 2004-06-13  Kaz Kojima  <kkojima@rr.iij4u.or.jp>
 
 	* sysdeps/unix/sysv/linux/sh/bits/pthreadtypes.h (pthread_cond_t):
diff --git a/nptl/tst-context1.c b/nptl/tst-context1.c
index 06e432b566..1a019ad000 100644
--- a/nptl/tst-context1.c
+++ b/nptl/tst-context1.c
@@ -25,11 +25,20 @@
 #include <stdlib.h>
 #include <ucontext.h>
 
-
 #define N	4
+#if __WORDSIZE == 64
+#define GUARD_PATTERN 0xdeadbeafdeadbeaf
+#else
+#define GUARD_PATTERN 0xdeadbeaf
+#endif
+
+typedef struct {
+       ucontext_t uctx;
+       unsigned long	guard[3];
+   } tst_context_t;
 
 static char stacks[N][PTHREAD_STACK_MIN];
-static ucontext_t ctx[N][2];
+static tst_context_t ctx[N][2];
 static volatile int failures;
 
 
@@ -42,6 +51,29 @@ fct (long int n)
   printf ("%ld: in %s now, on_stack = %p\n", n, __FUNCTION__, on_stack);
   errno = 0;
 
+  if (ctx[n][1].uctx.uc_link != &ctx[n][0].uctx)
+    {
+      printf ("context[%ld][1] uc_link damaged, = %p\n", n,
+	      ctx[n][1].uctx.uc_link);
+      exit (1);
+    }
+
+  if ((ctx[n][0].guard[0] != GUARD_PATTERN)
+  ||  (ctx[n][0].guard[1] != GUARD_PATTERN)
+  ||  (ctx[n][0].guard[2] != GUARD_PATTERN))
+    {
+      printf ("%ld: %s context[0] overflow detected!\n", n, __FUNCTION__);
+      ++failures;
+    }
+
+  if ((ctx[n][1].guard[0] != GUARD_PATTERN)
+  ||  (ctx[n][1].guard[1] != GUARD_PATTERN)
+  ||  (ctx[n][1].guard[2] != GUARD_PATTERN))
+    {
+      printf ("%ld: %s context[1] overflow detected!\n", n, __FUNCTION__);
+      ++failures;
+    }
+
   if (n < 0 || n >= N)
     {
       printf ("%ld out of range\n", n);
@@ -61,7 +93,15 @@ tf (void *arg)
 {
   int n = (int) (long int) arg;
 
-  if (getcontext (&ctx[n][1]) != 0)
+  ctx[n][0].guard[0] = GUARD_PATTERN;
+  ctx[n][0].guard[1] = GUARD_PATTERN;
+  ctx[n][0].guard[2] = GUARD_PATTERN;
+
+  ctx[n][1].guard[0] = GUARD_PATTERN;
+  ctx[n][1].guard[1] = GUARD_PATTERN;
+  ctx[n][1].guard[2] = GUARD_PATTERN;
+
+  if (getcontext (&ctx[n][1].uctx) != 0)
     {
       printf ("%d: cannot get context: %m\n", n);
       exit (1);
@@ -69,14 +109,14 @@ tf (void *arg)
 
   printf ("%d: %s: before makecontext\n", n, __FUNCTION__);
 
-  ctx[n][1].uc_stack.ss_sp = stacks[n];
-  ctx[n][1].uc_stack.ss_size = PTHREAD_STACK_MIN;
-  ctx[n][1].uc_link = &ctx[n][0];
-  makecontext (&ctx[n][1], (void (*) (void)) fct, 1, (long int) n);
+  ctx[n][1].uctx.uc_stack.ss_sp = stacks[n];
+  ctx[n][1].uctx.uc_stack.ss_size = PTHREAD_STACK_MIN;
+  ctx[n][1].uctx.uc_link = &ctx[n][0].uctx;
+  makecontext (&ctx[n][1].uctx, (void (*) (void)) fct, 1, (long int) n);
 
   printf ("%d: %s: before swapcontext\n", n, __FUNCTION__);
 
-  if (swapcontext (&ctx[n][0], &ctx[n][1]) != 0)
+  if (swapcontext (&ctx[n][0].uctx, &ctx[n][1].uctx) != 0)
     {
       ++failures;
       printf ("%d: %s: swapcontext failed\n", n, __FUNCTION__);
diff --git a/sunrpc/pmap_prot2.c b/sunrpc/pmap_prot2.c
index aa1f8eb8ad..9dd4925a19 100644
--- a/sunrpc/pmap_prot2.c
+++ b/sunrpc/pmap_prot2.c
@@ -93,7 +93,7 @@ xdr_pmaplist (xdrs, rp)
    */
   bool_t more_elements;
   int freeing = (xdrs->x_op == XDR_FREE);
-  struct pmaplist **next = NULL;
+  struct pmaplist *next = NULL;
 
   while (TRUE)
     {
@@ -108,12 +108,12 @@ xdr_pmaplist (xdrs, rp)
        * before we free the current object ...
        */
       if (freeing)
-	next = &((*rp)->pml_next);
+	next = (*rp)->pml_next;
       if (!INTUSE(xdr_reference) (xdrs, (caddr_t *) rp,
 				  (u_int) sizeof (struct pmaplist),
 				  (xdrproc_t) INTUSE(xdr_pmap)))
 	  return FALSE;
-      rp = freeing ? next : &((*rp)->pml_next);
+      rp = freeing ? &next : &((*rp)->pml_next);
     }
 }
 INTDEF(xdr_pmaplist)