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Diffstat (limited to 'regress/sys/uvm/mmap_write_self/mmap_write_self.c')
-rw-r--r--regress/sys/uvm/mmap_write_self/mmap_write_self.c58
1 files changed, 58 insertions, 0 deletions
diff --git a/regress/sys/uvm/mmap_write_self/mmap_write_self.c b/regress/sys/uvm/mmap_write_self/mmap_write_self.c
new file mode 100644
index 00000000000..417850d072a
--- /dev/null
+++ b/regress/sys/uvm/mmap_write_self/mmap_write_self.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2011 Artur Grabowski <art@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <err.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+/*
+ * Test a corner case writing to a file from an mmap region from that file
+ * should fail.
+ */
+int
+main(int argc, char **argv)
+{
+ char name[20] = "/tmp/fluff.XXXXXX";
+ char *buf;
+ size_t ps;
+ int fd;
+
+ ps = getpagesize();
+
+ if ((fd = mkstemp(name)) == -1)
+ err(1, "mkstemp");
+
+ if (unlink(name) == -1)
+ err(1, "unlink");
+
+ buf = mmap(NULL, ps, PROT_READ, MAP_FILE|MAP_SHARED, fd, 0);
+ if (buf == MAP_FAILED)
+ err(1, "mmap");
+
+ if (pwrite(fd, buf, ps, 0) == ps)
+ errx(1, "write to self succeeded");
+
+ if (errno != EFAULT)
+ err(1, "unexpected errno");
+
+ return (0);
+}