1 files changed, 69 insertions, 19 deletions

diff --git a/posix/tst-mmap-offset.c b/posix/tst-mmap-offset.c
index d139c301d7..385df289e6 100644
--- a/posix/tst-mmap-offset.c
+++ b/posix/tst-mmap-offset.c
@@ -1,4 +1,4 @@
-/* BZ #18877 mmap offset test.
+/* BZ #18877 and #21270 mmap offset test.
 
    Copyright (C) 2015-2017 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
@@ -21,18 +21,37 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <errno.h>
 #include <sys/mman.h>
 
-static int
-printmsg (int rc, const char *msg)
+#include <support/check.h>
+
+static int fd;
+static long int page_shift;
+static char fname[] = "tst-mmap-offset-XXXXXX";
+
+static void
+do_prepare (int argc, char **argv)
 {
-  printf ("%s failed: %m\n", msg);
-  return rc;
+  fd = mkstemp64 (fname);
+  if (fd < 0)
+    FAIL_EXIT1 ("mkstemp failed");
+
+  if (unlink (fname))
+    FAIL_EXIT1 ("unlink failed");
+
+  long sz = sysconf(_SC_PAGESIZE);
+  if (sz == -1)
+    sz = 4096L;
+  page_shift = ffs (sz) - 1;
 }
 
+#define PREPARE do_prepare
+
+
 /* Check if negative offsets are handled correctly by mmap.  */
 static int
-do_test (void)
+do_test_bz18877 (void)
 {
   const int prot = PROT_READ | PROT_WRITE;
   const int flags = MAP_SHARED;
@@ -40,22 +59,13 @@ do_test (void)
   const unsigned long offset = 0xace00000;
   const unsigned long size = offset + length;
   void *addr;
-  int fd;
-  char fname[] = "tst-mmap-offset-XXXXXX";
-
-  fd = mkstemp64 (fname);
-  if (fd < 0)
-    return printmsg (1, "mkstemp");
-
-  if (unlink (fname))
-    return printmsg (1, "unlink");
 
   if (ftruncate64 (fd, size))
-    return printmsg (0, "ftruncate64");
+    FAIL_RET ("ftruncate64 failed");
 
   addr = mmap (NULL, length, prot, flags, fd, offset);
   if (MAP_FAILED == addr)
-    return printmsg (1, "mmap");
+    FAIL_RET ("mmap failed");
 
   /* This memcpy is likely to SIGBUS if mmap has messed up with offset.  */
   memcpy (addr, fname, sizeof (fname));
@@ -63,5 +73,45 @@ do_test (void)
   return 0;
 }
 
-#define TEST_FUNCTION do_test ()
-#include "../test-skeleton.c"
+/* Check if invalid offset are handled correctly by mmap.  */
+static int
+do_test_bz21270 (void)
+{
+  /* For architectures with sizeof (off_t) < sizeof (off64_t) mmap is
+     implemented with __SYS_mmap2 syscall and the offset is represented in
+     multiples of page size.  For offset larger than
+     '1 << (page_shift + 8 * sizeof (off_t))' (that is, 1<<44 on system with
+     page size of 4096 bytes) the system call silently truncates the offset.
+     For this case glibc mmap implementation returns EINVAL.  */
+  const int prot = PROT_READ | PROT_WRITE;
+  const int flags = MAP_SHARED;
+  const int64_t offset = 1ULL << (page_shift + 8 * sizeof (uint32_t));
+  const size_t length = 4096;
+
+  void *addr = mmap64 (NULL, length, prot, flags, fd, offset);
+  if (sizeof (off_t) < sizeof (off64_t))
+    {
+      if ((addr != MAP_FAILED) && (errno != EINVAL))
+	FAIL_RET ("mmap succeed");
+    }
+  else
+    {
+      if (addr == MAP_FAILED)
+	FAIL_RET ("mmap failed");
+    }
+
+  return 0;
+}
+
+int
+do_test (void)
+{
+  int ret = 0;
+
+  ret += do_test_bz18877 ();
+  ret += do_test_bz21270 ();
+
+  return ret;
+}
+
+#include <support/test-driver.c>