xnu-792.6.76.tar.gz

[apple/xnu.git] / bsd / vfs / vfs_vnops.c

diff --git a/bsd/vfs/vfs_vnops.c b/bsd/vfs/vfs_vnops.c
index 3eb3f1522db6bcf8d986a75200559a24f7e430eb..402d876ea1049428ec45214cea41bd5b61b0adab 100644 (file)
--- a/bsd/vfs/vfs_vnops.c
+++ b/bsd/vfs/vfs_vnops.c
@@ -600,7 +600,19 @@ vn_write(struct fileproc *fp, struct uio *uio, kauth_cred_t cred,
         * Set the credentials on successful writes
         */
        if ((error == 0) && (vp->v_tag == VT_NFS) && (UBCINFOEXISTS(vp))) {
-               ubc_setcred(vp, p);
+               /* 
+                * When called from aio subsystem, we only have the proc from
+                * which to get the credential, at this point, so use that
+                * instead.  This means aio functions are incompatible with
+                * per-thread credentials (aio operations are proxied).  We
+                * can't easily correct the aio vs. settid race in this case
+                * anyway, so we disallow it.
+                */
+               if ((flags & FOF_PCRED) == 0) {
+                       ubc_setthreadcred(vp, p, current_thread());
+               } else {
+                       ubc_setcred(vp, p);
+               }
        }
        (void)vnode_put(vp);
        return (error);