Author: kib
Date: Sun Sep 20 12:40:56 2009
New Revision: 197348
URL: http://svn.freebsd.org/changeset/base/197348
Log:
Old (a.out) rtld attempts to mmap zero-length region, e.g. when bss
of the linked object is zero-length. More old code assumes that mmap
of zero length returns success.
For a.out and pre-8 ELF binaries, allow the mmap of zero length.
Reported by: tegge
Reviewed by: tegge, alc, jhb
MFC after: 3 days
Modified:
head/sys/vm/vm_mmap.c
Modified: head/sys/vm/vm_mmap.c
==============================================================================
--- head/sys/vm/vm_mmap.c Sun Sep 20 12:24:55 2009 (r197347)
+++ head/sys/vm/vm_mmap.c Sun Sep 20 12:40:56 2009 (r197348)
@@ -64,6 +64,7 @@ __FBSDID("$FreeBSD$");
#include <sys/mount.h>
#include <sys/conf.h>
#include <sys/stat.h>
+#include <sys/sysent.h>
#include <sys/vmmeter.h>
#include <sys/sysctl.h>
@@ -229,7 +230,8 @@ mmap(td, uap)
fp = NULL;
/* make sure mapping fits into numeric range etc */
- if (uap->len == 0 ||
+ if ((uap->len == 0 && !SV_CURPROC_FLAG(SV_AOUT) &&
+ curproc->p_osrel >= 800104) ||
((flags & MAP_ANON) && uap->fd != -1))
return (EINVAL);
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