Konstantin Belousov wrote:
> 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);
>
>
>
This hack needs a comment.
Sam
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