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In mmap(), bail out with EOVERFLOW when mapping a regular file and the file 

offset plus mapping length cannot be represented in an off_t.
This commit is contained in:
kleink 2000-03-28 18:45:19 +00:00
parent 2e68f6172e
commit 7e35a43e67
2 changed files with 12 additions and 2 deletions
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9
lib/libc/sys/mmap.2
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@ -1,4 +1,4 @@
.\" $NetBSD: mmap.2,v 1.20 1999/12/02 21:42:38 kleink Exp $
.\" $NetBSD: mmap.2,v 1.21 2000/03/28 18:45:19 kleink Exp $
.\"
.\" Copyright (c) 1991, 1993
.\" The Regents of the University of California. All rights reserved.
@ -232,6 +232,13 @@ was specified and the
parameter wasn't available.
.Dv MAP_ANON
was specified and insufficient memory was available.
.It Bq Er EOVERFLOW
.Fa fd
references a regular file and the value of
.Fa offset
plus
.Fa len
would exceed the offset maximum established in its open file description.
.El
.Sh SEE ALSO
.Xr madvise 2 ,

5
sys/uvm/uvm_mmap.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: uvm_mmap.c,v 1.38 2000/03/26 20:54:47 kleink Exp $ */
/* $NetBSD: uvm_mmap.c,v 1.39 2000/03/28 18:45:20 kleink Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@ -404,6 +404,9 @@ sys_mmap(p, v, retval)
vp->v_type != VBLK)
return (ENODEV); /* only REG/CHR/BLK support mmap */
if (vp->v_type == VREG && (pos + size) < pos)
return (EOVERFLOW); /* no offset wrapping */
/* special case: catch SunOS style /dev/zero */
if (vp->v_type == VCHR && iszerodev(vp->v_rdev)) {
flags |= MAP_ANON;