diff options
| -rw-r--r-- | sys/vm/vm_mmap.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/sys/vm/vm_mmap.c b/sys/vm/vm_mmap.c index 7baf8f335b38..ada1df653e79 100644 --- a/sys/vm/vm_mmap.c +++ b/sys/vm/vm_mmap.c @@ -38,7 +38,7 @@ * from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$ * * @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94 - * $Id: vm_mmap.c,v 1.74 1998/03/07 21:37:01 dyson Exp $ + * $Id: vm_mmap.c,v 1.75 1998/03/12 19:36:18 guido Exp $ */ /* @@ -295,12 +295,24 @@ mmap(p, uap) * we're at securelevel < 1, to allow the XIG X server * to continue to work. */ - if (((flags & MAP_SHARED) != 0 || - (vp->v_type == VCHR && disablexworkaround)) && - (fp->f_flag & FWRITE) == 0 && (prot & PROT_WRITE) != 0) - return (EACCES); - else + + if ((flags & MAP_SHARED) != 0 || + (vp->v_type == VCHR && disablexworkaround)) { + if ((fp->f_flag & FWRITE) != 0) { + if ((error = + VOP_GETATTR(vp, &va, + p->p_ucred, p))) + return (error); + if ((va.va_flags & + (IMMUTABLE|APPEND)) == 0) + maxprot |= VM_PROT_WRITE; + else if (prot & PROT_WRITE) + return (EPERM); + } else if ((prot & PROT_WRITE) != 0) + return (EACCES); + } else maxprot |= VM_PROT_WRITE; + handle = (void *)vp; } } |