[src/netbsd-8]: src Pull up following revision(s) (requested by kamil in tick...

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

details:   https://anonhg.NetBSD.org/src/rev/b9d993ab8134
branches:  netbsd-8
changeset: 850852:b9d993ab8134
user:      snj <snj%NetBSD.org@localhost>
date:      Mon Jul 24 06:03:42 2017 +0000

description:
Pull up following revision(s) (requested by kamil in ticket #120):
        sys/uvm/uvm_fault.c: revision 1.200
        tests/lib/libc/sys/t_write.c: revision 1.4-1.6
PR/52384: make uvm_fault_check() return EFAULT not EACCES, like our man
pages
(but not OpenGroup which does not document EFAULT for read/write, and onl=
y
documents EACCES for sockets) say for read/write.
--
check for EFAULT on reads and writes to memory with not permission.
--
add munmap
#define for const.
--
add another missing munmap (Kamil)

diffstat:

 sys/uvm/uvm_fault.c          |   6 ++--
 tests/lib/libc/sys/t_write.c |  62 ++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 63 insertions(+), 5 deletions(-)

diffs (126 lines):

diff -r b28286e6a341 -r b9d993ab8134 sys/uvm/uvm_fault.c
--- a/sys/uvm/uvm_fault.c       Mon Jul 24 05:47:59 2017 +0000
+++ b/sys/uvm/uvm_fault.c       Mon Jul 24 06:03:42 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uvm_fault.c,v 1.199 2017/03/20 15:51:41 skrll Exp $    */
+/*     $NetBSD: uvm_fault.c,v 1.199.6.1 2017/07/24 06:03:42 snj Exp $  */
 
 /*
  * Copyright (c) 1997 Charles D. Cranor and Washington University.
@@ -32,7 +32,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uvm_fault.c,v 1.199 2017/03/20 15:51:41 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uvm_fault.c,v 1.199.6.1 2017/07/24 06:03:42 snj Exp $");
 
 #include "opt_uvmhist.h"
 
@@ -950,7 +950,7 @@
                    "<- protection failure (prot=%#x, access=%#x)",
                    ufi->entry->protection, flt->access_type, 0, 0);
                uvmfault_unlockmaps(ufi, false);
-               return EACCES;
+               return EFAULT;
        }
 
        /*
diff -r b28286e6a341 -r b9d993ab8134 tests/lib/libc/sys/t_write.c
--- a/tests/lib/libc/sys/t_write.c      Mon Jul 24 05:47:59 2017 +0000
+++ b/tests/lib/libc/sys/t_write.c      Mon Jul 24 06:03:42 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: t_write.c,v 1.3 2017/01/13 19:27:23 christos Exp $ */
+/* $NetBSD: t_write.c,v 1.3.6.1 2017/07/24 06:03:42 snj Exp $ */
 
 /*-
  * Copyright (c) 2001, 2008 The NetBSD Foundation, Inc.
@@ -29,9 +29,10 @@
 #include <sys/cdefs.h>
 __COPYRIGHT("@(#) Copyright (c) 2008\
  The NetBSD Foundation, inc. All rights reserved.");
-__RCSID("$NetBSD: t_write.c,v 1.3 2017/01/13 19:27:23 christos Exp $");
+__RCSID("$NetBSD: t_write.c,v 1.3.6.1 2017/07/24 06:03:42 snj Exp $");
 
 #include <sys/uio.h>
+#include <sys/mman.h>
 
 #include <atf-c.h>
 #include <errno.h>
@@ -42,6 +43,7 @@
 #include <stdint.h>
 #include <string.h>
 #include <unistd.h>
+#include <paths.h>
 
 static void             sighandler(int);
 
@@ -213,6 +215,60 @@
        ATF_REQUIRE_EQ_MSG(errno, EINVAL, "got: %s", strerror(errno));
 }
 
+ATF_TC(write_fault);
+
+ATF_TC_HEAD(write_fault, tc)
+{
+       atf_tc_set_md_var(tc, "descr",
+           "Check that writing to non-permitted space returns EFAULT");
+}
+
+#define SIZE 8192
+
+ATF_TC_BODY(write_fault, tc)
+{
+       int fd[2];
+       ATF_REQUIRE(pipe(fd) != -1);
+       // Can't use /dev/null cause it doesn't access the buffer.
+
+       void *map = mmap(NULL, SIZE, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);  
+       ATF_REQUIRE(map != MAP_FAILED);
+
+       ssize_t retval = write(fd[1], map, SIZE); 
+
+       ATF_REQUIRE_EQ_MSG(retval, -1, "got: %zd", retval);
+       ATF_REQUIRE_EQ_MSG(errno, EFAULT, "got: %s", strerror(errno));
+
+       munmap(map, SIZE);
+       close(fd[0]);         
+       close(fd[1]);         
+}
+
+ATF_TC(read_fault);
+
+ATF_TC_HEAD(read_fault, tc)
+{
+       atf_tc_set_md_var(tc, "descr",
+           "Check that reading from non-permitted space returns EFAULT");
+}
+
+ATF_TC_BODY(read_fault, tc)
+{
+       int fd = open(_PATH_DEVZERO, O_RDONLY);
+       ATF_REQUIRE(fd != -1);
+
+       void *map = mmap(NULL, SIZE, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0);  
+       ATF_REQUIRE(map != MAP_FAILED);
+
+       ssize_t retval = read(fd, map, SIZE); 
+
+       ATF_REQUIRE_EQ_MSG(retval, -1, "got: %zd", retval);
+       ATF_REQUIRE_EQ_MSG(errno, EFAULT, "got: %s", strerror(errno));
+
+       munmap(map, SIZE);
+       close(fd);         
+}
+
 ATF_TP_ADD_TCS(tp)
 {
 
@@ -221,6 +277,8 @@
        ATF_TP_ADD_TC(tp, write_pos);
        ATF_TP_ADD_TC(tp, write_ret);
        ATF_TP_ADD_TC(tp, writev_iovmax);
+       ATF_TP_ADD_TC(tp, write_fault);
+       ATF_TP_ADD_TC(tp, read_fault);
 
        return atf_no_error();
 }