[src/nathanw_sa]: src/lib/libpthread Use munmap() to redzone-protect the end ...

[nathanw <nathanw%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a2eff8b60966
branches:  nathanw_sa
changeset: 504845:a2eff8b60966
user:      nathanw <nathanw%NetBSD.org@localhost>
date:      Fri Jul 13 02:20:27 2001 +0000

description:
Use munmap() to redzone-protect the end of the stack allocations.

diffstat:

 lib/libpthread/pthread_stack.c |  16 ++++++----------
 1 files changed, 6 insertions(+), 10 deletions(-)

diffs (35 lines):

diff -r 2e30ead5b535 -r a2eff8b60966 lib/libpthread/pthread_stack.c
--- a/lib/libpthread/pthread_stack.c    Fri Jul 13 02:15:59 2001 +0000
+++ b/lib/libpthread/pthread_stack.c    Fri Jul 13 02:20:27 2001 +0000
@@ -1,4 +1,4 @@
-/* $Id: pthread_stack.c,v 1.1.2.1 2001/03/05 23:52:00 nathanw Exp $ */
+/* $Id: pthread_stack.c,v 1.1.2.2 2001/07/13 02:20:27 nathanw Exp $ */
 
 /* Copyright */
 
@@ -83,20 +83,16 @@
 pthread__stackid_setup(void *base, int size)
 {
        pthread_t t;
-       int pagesize;
-#if 0
+       int pagesize, ret;
        void *addr;
-#endif
+
        /* Deallocate the bottom page but one as a red zone. */
        /* XXX assumes that the stack grows down. */
        pagesize = sysconf(_SC_PAGESIZE);
-#if 0 
-       addr = mmap( ((char *)base + pagesize), pagesize, PROT_NONE, 
-           MAP_FIXED|MAP_ANON|MAP_PRIVATE, -1, 0);
-       if (addr == MAP_FAILED)
-               err(2, "Couldn't mmap()-protect stack redzone at %p\n",
+       ret = munmap( ((char *)base + pagesize), pagesize);
+       if (ret == -1)
+               err(2, "Couldn't munmap()-protect stack redzone at %p\n",
                    (char *)base + pagesize);
-#endif
        /* Put a pointer to the pthread in the bottom (but
          *  redzone-protected section) of the stack. 
         */