diff --git a/pkgs/misc/uml/builder.sh b/pkgs/misc/uml/builder.sh
index 74187ed383a5..3790f479b16f 100644
--- a/pkgs/misc/uml/builder.sh
+++ b/pkgs/misc/uml/builder.sh
@@ -10,7 +10,7 @@ postUnpack() {
     }
     unpackCmd=unp
     unpackFile $umlPatch
-    patches=`pwd`/patch
+    patches="`pwd`/patch $noAioPatch"
 }
 postUnpack=postUnpack
 
diff --git a/pkgs/misc/uml/config b/pkgs/misc/uml/config
index 078b5477c107..8005c416b6e6 100644
--- a/pkgs/misc/uml/config
+++ b/pkgs/misc/uml/config
@@ -16,8 +16,7 @@ CONFIG_EXPERIMENTAL=y
 #
 # General Setup
 #
-# CONFIG_MODE_SKAS is not set
-CONFIG_MODE_TT=y
+CONFIG_MODE_SKAS=y
 CONFIG_MODE_TT=y
 CONFIG_NET=y
 CONFIG_SYSVIPC=y
@@ -27,6 +26,8 @@ CONFIG_BINFMT_AOUT=y
 CONFIG_BINFMT_ELF=y
 CONFIG_BINFMT_MISC=y
 CONFIG_HOSTFS=y
+CONFIG_HUMFS=y
+CONFIG_EXTERNFS=y
 # CONFIG_HPPFS is not set
 CONFIG_MCONSOLE=y
 CONFIG_MAGIC_SYSRQ=y
@@ -38,6 +39,7 @@ CONFIG_KERNEL_HALF_GIGS=1
 # CONFIG_HIGHMEM is not set
 # CONFIG_PROC_MM is not set
 CONFIG_KERNEL_STACK_ORDER=2
+# CONFIG_UML_REAL_TIME_CLOCK is not set
 
 #
 # Loadable module support
@@ -97,7 +99,7 @@ CONFIG_UML_NET_DAEMON=y
 CONFIG_UML_NET_MCAST=y
 # CONFIG_UML_NET_PCAP is not set
 CONFIG_DUMMY=y
-CONFIG_BONDING=m
+CONFIG_BONDING=n
 CONFIG_EQUALIZER=m
 CONFIG_TUN=y
 CONFIG_PPP=m
@@ -108,6 +110,7 @@ CONFIG_PPP_SYNC_TTY=m
 CONFIG_PPP_DEFLATE=m
 CONFIG_PPP_BSDCOMP=m
 CONFIG_PPPOE=m
+# CONFIG_PPP_MPPE is not set
 CONFIG_SLIP=m
 # CONFIG_SLIP_COMPRESSED is not set
 # CONFIG_SLIP_SMART is not set
@@ -133,6 +136,12 @@ CONFIG_INET=y
 # CONFIG_SYN_COOKIES is not set
 # CONFIG_IPV6 is not set
 # CONFIG_KHTTPD is not set
+
+#
+#    SCTP Configuration (EXPERIMENTAL)
+#
+CONFIG_IPV6_SCTP__=y
+# CONFIG_IP_SCTP is not set
 # CONFIG_ATM is not set
 # CONFIG_VLAN_8021Q is not set
 
@@ -180,7 +189,7 @@ CONFIG_REISERFS_FS=m
 CONFIG_ADFS_FS=m
 # CONFIG_ADFS_FS_RW is not set
 CONFIG_AFFS_FS=m
-CONFIG_HFS_FS=m
+CONFIG_HFS_FS=n
 # CONFIG_HFSPLUS_FS is not set
 # CONFIG_BEFS_FS is not set
 # CONFIG_BEFS_DEBUG is not set
@@ -223,6 +232,11 @@ CONFIG_UDF_FS=m
 # CONFIG_UDF_RW is not set
 CONFIG_UFS_FS=m
 # CONFIG_UFS_FS_WRITE is not set
+# CONFIG_XFS_FS is not set
+# CONFIG_XFS_QUOTA is not set
+# CONFIG_XFS_RT is not set
+# CONFIG_XFS_TRACE is not set
+# CONFIG_XFS_DEBUG is not set
 
 #
 # Network File Systems
@@ -353,5 +367,4 @@ CONFIG_ZLIB_DEFLATE=m
 # CONFIG_DEBUG_SLAB is not set
 # CONFIG_DEBUGSYM is not set
 # CONFIG_PT_PROXY is not set
-# CONFIG_GPROF is not set
 # CONFIG_GCOV is not set
diff --git a/pkgs/misc/uml/default.nix b/pkgs/misc/uml/default.nix
index 8a1aadc7213d..c4b1a4c86ac3 100644
--- a/pkgs/misc/uml/default.nix
+++ b/pkgs/misc/uml/default.nix
@@ -3,16 +3,17 @@
 assert patch != null && perl != null && m4 != null;
 
 stdenv.mkDerivation {
-  name = "uml-2.4.22-3";
+  name = "uml-2.4.25-1";
   builder = ./builder.sh;
   src = fetchurl {
-    url = ftp://ftp.nl.kernel.org/pub/linux/kernel/v2.4/linux-2.4.22.tar.bz2;
-    md5 = "75dc85149b06ac9432106b8941eb9f7b";
+    url = ftp://ftp.nl.kernel.org/pub/linux/kernel/v2.4/linux-2.4.25.tar.bz2;
+    md5 = "5fc8e9f43fa44ac29ddf9a9980af57d8";
   };
   umlPatch = fetchurl {
-    url = http://uml-pub.ists.dartmouth.edu/uml/uml-patch-2.4.22-3.bz2;
-    md5 = "1ffa698fed37d14c6750ec841b7d9858";
+    url = http://heanet.dl.sourceforge.net/sourceforge/user-mode-linux/uml-patch-2.4.25-1.bz2;
+    md5 = "aacbb7b19ec7599119313a31328e1912";
   };
+  noAioPatch = ./no-aio.patch;
   config = ./config;
   buildInputs = [patch perl m4];
 }
diff --git a/pkgs/misc/uml/no-aio.patch b/pkgs/misc/uml/no-aio.patch
new file mode 100644
index 000000000000..294e61b6affb
--- /dev/null
+++ b/pkgs/misc/uml/no-aio.patch
@@ -0,0 +1,25 @@
+diff -rc linux-orig/arch/um/os-Linux/Makefile linux-2.4.25/arch/um/os-Linux/Makefile
+*** linux-orig/arch/um/os-Linux/Makefile	2004-07-29 21:39:41.000000000 +0200
+--- linux-2.4.25/arch/um/os-Linux/Makefile	2004-07-29 21:56:51.000000000 +0200
+***************
+*** 7,16 ****
+  
+  obj-y = aio.o file.o process.o time.o tty.o
+  
+! HAVE_AIO_ABI = $(shell [ -e /usr/include/linux/aio_abi.h ] && \
+! 	echo -DHAVE_AIO_ABI)
+! HAVE_AIO_LIBC = $(shell objdump -T /lib/libc-*.so | grep io_submit && \
+! 	echo -DHAVE_AIO_LIBC)
+  CFLAGS_aio.o = $(HAVE_AIO_ABI) $(HAVE_AIO_LIBC)
+  
+  include $(TOPDIR)/Rules.make
+--- 7,15 ----
+  
+  obj-y = aio.o file.o process.o time.o tty.o
+  
+! # Removed impure check for AIO feature in glibc.
+! HAVE_AIO_ABI = 
+! HAVE_AIO_LIBC = 
+  CFLAGS_aio.o = $(HAVE_AIO_ABI) $(HAVE_AIO_LIBC)
+  
+  include $(TOPDIR)/Rules.make