Author: Matti Picus <[email protected]>
Branch: win32-cleanup2
Changeset: r54252:be83d722b0fb
Date: 2012-04-08 15:04 +0300
http://bitbucket.org/pypy/pypy/changeset/be83d722b0fb/
Log: add check for offset validiy
diff --git a/pypy/rlib/rmmap.py b/pypy/rlib/rmmap.py
--- a/pypy/rlib/rmmap.py
+++ b/pypy/rlib/rmmap.py
@@ -747,6 +747,25 @@
# SEEK_SET = 0
# libc._lseek(fileno, 0, SEEK_SET)
+ # check file size
+ try:
+ st = os.fstat(fileno)
+ except OSError:
+ pass # ignore errors and trust map_size
+ else:
+ mode = st[stat.ST_MODE]
+ size = st[stat.ST_SIZE]
+ if stat.S_ISREG(mode):
+ if map_size == 0:
+ if offset > size:
+ raise RValueError(
+ "mmap offset is greater than file size")
+ map_size = int(size - offset)
+ if map_size != size - offset:
+ raise RValueError("mmap length is too large")
+ elif offset + map_size > size:
+ raise RValueError("mmap length is greater than file size")
+
m = MMap(access, offset)
m.file_handle = INVALID_HANDLE
m.map_handle = INVALID_HANDLE
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