Date: Sun, 20 Sep 2009 12:40:56 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r197348 - head/sys/vm Message-ID: <200909201240.n8KCeubH056620@svn.freebsd.org>
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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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