Cron: pam_unix (cron:session): session opened/closed for user root by (uid=0)

There are ongoing log entries from cron about the root account that look like:
Cron: pam_unix (cron:session): session opened/closed for user root by (uid=0)

To remove those entries from the log I found the following solution on the web:

session [success=1 default=ignore] pam_succeed_if.so service in cron quiet use_uid
session required pam_unix.so

Right before the line session required pam_unix.so you need to add the line:
session [success=1 default=ignore] pam_succeed_if.so service in cron quiet use_uid

Bootlog sheevaplug

[  296.577844] Restarting system.
þ
         __  __                      _ _
        |  /  | __ _ _ ____   _____| | |
        | |/| |/ _` | '__  / / _  | |
        | |  | | (_| | |    V /  __/ | |
        |_|  |_|__,_|_|    _/ ___|_|_|
 _   _     ____              _
| | | |   | __ )  ___   ___ | |_
| | | |___|  _  / _  / _ | __|
| |_| |___| |_) | (_) | (_) | |_
 ___/    |____/ ___/ ___/ __|
 ** MARVELL BOARD: SHEEVA PLUG LE

U-Boot 1.1.4 (Jul 19 2009 - 16:03:28) Marvell version: 3.4.19

U-Boot code: 00600000 -> 0067FFF0  BSS: -> 006CFB00

Soc: 88F6281 A0 (DDR2)
CPU running @ 1200Mhz L2 running @ 400Mhz
SysClock = 400Mhz , TClock = 200Mhz

DRAM CAS Latency = 5 tRP = 5 tRAS = 18 tRCD=6
DRAM CS[0] base 0x00000000   size 256MB
DRAM CS[1] base 0x10000000   size 256MB
DRAM Total size 512MB  16bit width
Addresses 8M - 0M are saved for the U-Boot usage.
Mem malloc Initialization (8M - 7M): Done
NAND:512 MB
Flash:  0 kB

CPU : Marvell Feroceon (Rev 1)

Streaming disabled
Write allocate disabled

USB 0: host mode
PEX 0: interface detected no Link.
Net:   egiga0 [PRIME], egiga1
Hit any key to stop autoboot:  3  2  1  0
SDHC found. Card desciption is:
Manufacturer:       0x1b, OEM "SM"
Product name:       "00000", revision 1.0
Serial number:      2982416674
Manufacturing date: 12/2008
CRC:                0x00, b0 = 0

5095986 bytes read

1426888 bytes read
## Booting image at 00400000 ...
   Image Name:   Debian kernel 2.6.32-trunk-kirkw
   Created:      2010-03-20  23:12:28 UTC
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1426824 Bytes =  1.4 MB
   Load Address: 00008000
   Entry Point:  00008000
   Verifying Checksum ... OK
OK
## Loading Ramdisk Image at 00800000 ...
   Image Name:   Debian ramdisk 2.6.32-trunk-kirk
   Created:      2010-03-20  23:12:29 UTC
   Image Type:   ARM Linux RAMDisk Image (gzip compressed)
   Data Size:    5095922 Bytes =  4.9 MB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Linux version 2.6.32-trunk-kirkwood (Debian 2.6.32-5) (ben@decadent.org.uk) (gcc version 4.3.4 (Debian 4.3.4-6) ) #1 Mon Jan 11 10:57:12 UTC 2010
[    0.000000] CPU: Feroceon 88FR131 [56251311] revision 1 (ARMv5TE), cr=00053977
[    0.000000] CPU: VIVT data cache, VIVT instruction cache
[    0.000000] Machine: Marvell SheevaPlug Reference Board
[    0.000000] Memory policy: ECC disabled, Data cache writeback
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 130048
[    0.000000] Kernel command line: console=ttyS0,115200
[    0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
[    0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
[    0.000000] Memory: 256MB 256MB = 512MB total
[    0.000000] Memory: 510208KB available (3504K code, 578K data, 120K init, 0K highmem)
[    0.000000] SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] Hierarchical RCU implementation.
[    0.000000] NR_IRQS:114
[    0.000000] Console: colour dummy device 80x30
[   21.474960] Calibrating delay loop... 1192.75 BogoMIPS (lpj=5963776)
[   21.714922] Security Framework initialized
[   21.714942] SELinux:  Disabled at boot.
[   21.714967] Mount-cache hash table entries: 512
[   21.715262] Initializing cgroup subsys ns
[   21.715277] Initializing cgroup subsys cpuacct
[   21.715287] Initializing cgroup subsys devices
[   21.715296] Initializing cgroup subsys freezer
[   21.715303] Initializing cgroup subsys net_cls
[   21.715346] CPU: Testing write buffer coherency: ok
[   21.716036] devtmpfs: initialized
[   21.717676] regulator: core version 0.5
[   21.717882] NET: Registered protocol family 16
[   21.718376] Kirkwood: MV88F6281-A0, TCLK=200000000.
[   21.718388] Feroceon L2: Enabling L2
[   21.718421] Feroceon L2: Cache support initialised.
[   21.720432] bio: create slab <bio-0> at 0
[   21.720694] vgaarb: loaded
[   21.721141] Switching to clocksource orion_clocksource
[   21.724778] NET: Registered protocol family 2
[   21.725070] IP route cache hash table entries: 4096 (order: 2, 16384 bytes)
[   21.725817] TCP established hash table entries: 16384 (order: 5, 131072 bytes)
[   21.726169] TCP bind hash table entries: 16384 (order: 4, 65536 bytes)
[   21.726348] TCP: Hash tables configured (established 16384 bind 16384)
[   21.726358] TCP reno registered
[   21.726507] NET: Registered protocol family 1
[   21.726675] Unpacking initramfs...
[   22.052100] Freeing initrd memory: 4976K
[   22.052191] NetWinder Floating Point Emulator V0.97 (double precision)
[   22.052434] audit: initializing netlink socket (disabled)
[   22.052484] type=2000 audit(0.570:1): initialized
[   22.058909] VFS: Disk quotas dquot_6.5.2
[   22.059172] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[   22.059264] JFFS2 version 2.2. (NAND) (SUMMARY)  © 2001-2006 Red Hat, Inc.
[   22.059894] msgmni has been set to 1006
[   22.061527] alg: No test for stdrng (krng)
[   22.061645] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253)
[   22.061658] io scheduler noop registered
[   22.061665] io scheduler anticipatory registered
[   22.061672] io scheduler deadline registered
[   22.061858] io scheduler cfq registered (default)
[   22.067756] Serial: 8250/16550 driver, 2 ports, IRQ sharing disabled
[   22.068200] serial8250.0: ttyS0 at MMIO 0xf1012000 (irq = 33) is a 16550A
[   22.387771] console [ttyS0] enabled
[   22.391832] NAND device: Manufacturer ID: 0xad, Chip ID: 0xdc (Hynix NAND 512MiB 3,3V 8-bit)
[   22.400316] Scanning device for bad blocks
[   22.435580] Bad eraseblock 1064 at 0x000008500000
[   22.487249] Bad eraseblock 2671 at 0x000014de0000
[   22.492016] Bad eraseblock 2672 at 0x000014e00000
[   22.534774] Bad eraseblock 3974 at 0x00001f0c0000
[   22.543046] Creating 3 MTD partitions on "orion_nand":
[   22.548217] 0x000000000000-0x000000100000 : "u-boot"
[   22.553765] 0x000000100000-0x000000500000 : "uImage"
[   22.559209] 0x000000500000-0x000020000000 : "root"
[   22.565447] mice: PS/2 mouse device common for all mice
[   22.571039] rtc-mv rtc-mv: rtc core: registered rtc-mv as rtc0
[   22.576999] i2c /dev entries driver
[   22.580667] cpuidle: using governor ladder
[   22.584915] cpuidle: using governor menu
[   22.588946] Registered led device: plug:green:health
[   22.593995] mv_xor_shared mv_xor_shared.0: Marvell shared XOR driver
[   22.600390] mv_xor_shared mv_xor_shared.1: Marvell shared XOR driver
[   22.641203] mv_xor mv_xor.0: Marvell XOR: ( xor cpy )
[   22.681201] mv_xor mv_xor.1: Marvell XOR: ( xor fill cpy )
[   22.721201] mv_xor mv_xor.2: Marvell XOR: ( xor cpy )
[   22.761200] mv_xor mv_xor.3: Marvell XOR: ( xor fill cpy )
[   22.767859] TCP cubic registered
[   22.771105] NET: Registered protocol family 17
[   22.775918] registered taskstats version 1
[   22.780651] rtc-mv rtc-mv: setting system clock to 2010-03-27 20:04:14 UTC (1269720254)
[   22.788751] Freeing init memory: 120K
Loading, please wait...
Begin: Loading essential drivers ... done.
Begin: Running /scripts/init-premount ... [   23.322055] MV-643xx 10/100/1000 ethernet driver version 1.4
[   23.328000] mv643xx_eth smi: probed
[   23.372254] net eth0: port 0 with MAC address 00:50:43:01:68:8a
[   23.388502] usbcore: registered new interface driver usbfs
[   23.395214] mmc0: mvsdio driver initialized, lacking card detect (fall back to polling)
[   23.403411] usbcore: registered new interface driver hub
[   23.410349] usbcore: registered new device driver usb
[   23.429105] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[   23.435740] orion-ehci orion-ehci.0: Marvell Orion EHCI
[   23.441057] orion-ehci orion-ehci.0: new USB bus registered, assigned bus number 1
[   23.471187] orion-ehci orion-ehci.0: irq 19, io mem 0xf1050000
[   23.483781] mmc0: host does not support reading read-only switch. assuming write-enable.
[   23.491949] orion-ehci orion-ehci.0: USB 2.0 started, EHCI 1.00
[   23.497949] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[   23.504791] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[   23.512054] usb usb1: Product: Marvell Orion EHCI
[   23.516779] usb usb1: Manufacturer: Linux 2.6.32-trunk-kirkwood ehci_hcd
[   23.523519] usb usb1: SerialNumber: orion-ehci.0
[   23.528165] mmc0: new high speed SDHC card at address 0002
[   23.547108] mmcblk0: mmc0:0002 00000 3.81 GiB
[   23.551772]  mmcblk0: p1 p2 p3
[   23.555638] usb usb1: configuration #1 chosen from 1 choice
[   23.564011] hub 1-0:1.0: USB hub found
[   23.567813] hub 1-0:1.0: 1 port detected
done.
Begin: Mounting root file system ... Begin: Running /scripts/local-top ... done.
Begin: Running /scripts/local-premount ... done.
[   23.785569] kjournald starting.  Commit interval 5 seconds
[   23.791103] EXT3-fs: mounted filesystem with ordered data mode.
Begin: Running /scripts/local-bottom ... done.
done.
Begin: Running /scripts/init-bottom ... done.
[   23.891501] usb 1-1: new high speed USB device using orion-ehci and address 2

INIT: [   24.042701] usb 1-1: New USB device found, idVendor=0471, idProduct=085b
[   24.049434] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   24.056621] usb 1-1: Product: USB Memory Key
[   24.060907] usb 1-1: SerialNumber: dad30b02ebf5ce
version 2.86 boo[   24.066049] usb 1-1: configuration #1 chosen from 1 choice
ting

Starting the hotplug events dispatcher: udevd[   24.403178] udev: starting version 151
.
Synthesizing the initial hotplug events...done.
Waiting for /dev to be fully populated...[   24.884159] SCSI subsystem initialized
[   24.949031] Initializing USB Mass Storage driver...
[   24.954223] scsi0 : SCSI emulation for USB Mass Storage devices
[   24.960858] usbcore: registered new interface driver usb-storage
[   24.967405] USB Mass Storage support registered.
done.
Activating swap...[   25.152562] Adding 487864k swap on /dev/mmcblk0p2.  Priority:-1 extents:1 across:487864k SS
done.
Checking root file system...fsck from util-linux-ng 2.16.2
e2fsck 1.41.10 (10-Feb-2009)
root: clean, 21609/204000 files, 187422/815472 blocks
done.
[   26.110461] EXT3 FS on mmcblk0p3, internal journal
Cleaning up ifupdown....
Checking file systems...fsck from util-linux-ng 2.16.2
e2fsck 1.41.10 (10-Feb-2009)
/dev/mmcblk0p1: clean, 28/122880 files, 48189/245761 blocks
done.
Setting up networking....
Mounting local filesystems...