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  1. 02 8月, 2010 4 次提交
  3. 27 6月, 2010 1 次提交
  5. 28 5月, 2010 2 次提交
  7. 25 5月, 2010 1 次提交
  9. 22 5月, 2010 2 次提交
  11. 18 5月, 2010 1 次提交
  13. 17 5月, 2010 4 次提交
  15. 14 5月, 2010 1 次提交
  17. 10 5月, 2010 1 次提交
  19. 07 5月, 2010 1 次提交
  21. 06 5月, 2010 4 次提交
  23. 05 5月, 2010 9 次提交
    • T
      TOMOYO: Use GFP_NOFS rather than GFP_KERNEL. · 4e5d6f7e
      由 Tetsuo Handa 提交于 
      In Ubuntu, security_path_*() hooks are exported to Unionfs. Thus, prepare for
being called from inside VFS functions because I'm not sure whether it is safe
to use GFP_KERNEL or not.
Signed-off-by: NTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: NJames Morris <jmorris@namei.org>
      4e5d6f7e
    • D
      KEYS: call_sbin_request_key() must write lock keyrings before modifying them · 896903c2
      由 David Howells 提交于 
      call_sbin_request_key() creates a keyring and then attempts to insert a link to
the authorisation key into that keyring, but does so without holding a write
lock on the keyring semaphore.

It will normally get away with this because it hasn't told anyone that the
keyring exists yet.  The new keyring, however, has had its serial number
published, which means it can be accessed directly by that handle.

This was found by a previous patch that adds RCU lockdep checks to the code
that reads the keyring payload pointer, which includes a check that the keyring
semaphore is actually locked.

Without this patch, the following command:

	keyctl request2 user b a @s

will provoke the following lockdep warning is displayed in dmesg:

	===================================================
	[ INFO: suspicious rcu_dereference_check() usage. ]
	---------------------------------------------------
	security/keys/keyring.c:727 invoked rcu_dereference_check() without protection!

	other info that might help us debug this:

	rcu_scheduler_active = 1, debug_locks = 0
	2 locks held by keyctl/2076:
	 #0:  (key_types_sem){.+.+.+}, at: [<ffffffff811a5b29>] key_type_lookup+0x1c/0x71
	 #1:  (keyring_serialise_link_sem){+.+.+.}, at: [<ffffffff811a6d1e>] __key_link+0x4d/0x3c5

	stack backtrace:
	Pid: 2076, comm: keyctl Not tainted 2.6.34-rc6-cachefs #54
	Call Trace:
	 [<ffffffff81051fdc>] lockdep_rcu_dereference+0xaa/0xb2
	 [<ffffffff811a6d1e>] ? __key_link+0x4d/0x3c5
	 [<ffffffff811a6e6f>] __key_link+0x19e/0x3c5
	 [<ffffffff811a5952>] ? __key_instantiate_and_link+0xb1/0xdc
	 [<ffffffff811a59bf>] ? key_instantiate_and_link+0x42/0x5f
	 [<ffffffff811aa0dc>] call_sbin_request_key+0xe7/0x33b
	 [<ffffffff8139376a>] ? mutex_unlock+0x9/0xb
	 [<ffffffff811a5952>] ? __key_instantiate_and_link+0xb1/0xdc
	 [<ffffffff811a59bf>] ? key_instantiate_and_link+0x42/0x5f
	 [<ffffffff811aa6fa>] ? request_key_auth_new+0x1c2/0x23c
	 [<ffffffff810aaf15>] ? cache_alloc_debugcheck_after+0x108/0x173
	 [<ffffffff811a9d00>] ? request_key_and_link+0x146/0x300
	 [<ffffffff810ac568>] ? kmem_cache_alloc+0xe1/0x118
	 [<ffffffff811a9e45>] request_key_and_link+0x28b/0x300
	 [<ffffffff811a89ac>] sys_request_key+0xf7/0x14a
	 [<ffffffff81052c0b>] ? trace_hardirqs_on_caller+0x10c/0x130
	 [<ffffffff81394fb9>] ? trace_hardirqs_on_thunk+0x3a/0x3f
	 [<ffffffff81001eeb>] system_call_fastpath+0x16/0x1b
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NJames Morris <jmorris@namei.org>
      896903c2
    • D
      KEYS: Use RCU dereference wrappers in keyring key type code · f0641cba
      由 David Howells 提交于 
      The keyring key type code should use RCU dereference wrappers, even when it
holds the keyring's key semaphore.
Reported-by: NVegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NSerge Hallyn <serue@us.ibm.com>
Signed-off-by: NJames Morris <jmorris@namei.org>
      f0641cba
    • T
      KEYS: find_keyring_by_name() can gain access to a freed keyring · cea7daa3
      由 Toshiyuki Okajima 提交于 
      find_keyring_by_name() can gain access to a keyring that has had its reference
count reduced to zero, and is thus ready to be freed.  This then allows the
dead keyring to be brought back into use whilst it is being destroyed.

The following timeline illustrates the process:

|(cleaner)                           (user)
|
| free_user(user)                    sys_keyctl()
|  |                                  |
|  key_put(user->session_keyring)     keyctl_get_keyring_ID()
|  ||	//=> keyring->usage = 0        |
|  |schedule_work(&key_cleanup_task)   lookup_user_key()
|  ||                                   |
|  kmem_cache_free(,user)               |
|  .                                    |[KEY_SPEC_USER_KEYRING]
|  .                                    install_user_keyrings()
|  .                                    ||
| key_cleanup() [<= worker_thread()]    ||
|  |                                    ||
|  [spin_lock(&key_serial_lock)]        |[mutex_lock(&key_user_keyr..mutex)]
|  |                                    ||
|  atomic_read() == 0                   ||
|  |{ rb_ease(&key->serial_node,) }     ||
|  |                                    ||
|  [spin_unlock(&key_serial_lock)]      |find_keyring_by_name()
|  |                                    |||
|  keyring_destroy(keyring)             ||[read_lock(&keyring_name_lock)]
|  ||                                   |||
|  |[write_lock(&keyring_name_lock)]    ||atomic_inc(&keyring->usage)
|  |.                                   ||| *** GET freeing keyring ***
|  |.                                   ||[read_unlock(&keyring_name_lock)]
|  ||                                   ||
|  |list_del()                          |[mutex_unlock(&key_user_k..mutex)]
|  ||                                   |
|  |[write_unlock(&keyring_name_lock)]  ** INVALID keyring is returned **
|  |                                    .
|  kmem_cache_free(,keyring)            .
|                                       .
|                                       atomic_dec(&keyring->usage)
v                                         *** DESTROYED ***
TIME

If CONFIG_SLUB_DEBUG=y then we may see the following message generated:

	=============================================================================
	BUG key_jar: Poison overwritten
	-----------------------------------------------------------------------------

	INFO: 0xffff880197a7e200-0xffff880197a7e200. First byte 0x6a instead of 0x6b
	INFO: Allocated in key_alloc+0x10b/0x35f age=25 cpu=1 pid=5086
	INFO: Freed in key_cleanup+0xd0/0xd5 age=12 cpu=1 pid=10
	INFO: Slab 0xffffea000592cb90 objects=16 used=2 fp=0xffff880197a7e200 flags=0x200000000000c3
	INFO: Object 0xffff880197a7e200 @offset=512 fp=0xffff880197a7e300

	Bytes b4 0xffff880197a7e1f0:  5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZZZZZZZZZ
	  Object 0xffff880197a7e200:  6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b jkkkkkkkkkkkkkkk

Alternatively, we may see a system panic happen, such as:

	BUG: unable to handle kernel NULL pointer dereference at 0000000000000001
	IP: [<ffffffff810e61a3>] kmem_cache_alloc+0x5b/0xe9
	PGD 6b2b4067 PUD 6a80d067 PMD 0
	Oops: 0000 [#1] SMP
	last sysfs file: /sys/kernel/kexec_crash_loaded
	CPU 1
	...
	Pid: 31245, comm: su Not tainted 2.6.34-rc5-nofixed-nodebug #2 D2089/PRIMERGY
	RIP: 0010:[<ffffffff810e61a3>]  [<ffffffff810e61a3>] kmem_cache_alloc+0x5b/0xe9
	RSP: 0018:ffff88006af3bd98  EFLAGS: 00010002
	RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88007d19900b
	RDX: 0000000100000000 RSI: 00000000000080d0 RDI: ffffffff81828430
	RBP: ffffffff81828430 R08: ffff88000a293750 R09: 0000000000000000
	R10: 0000000000000001 R11: 0000000000100000 R12: 00000000000080d0
	R13: 00000000000080d0 R14: 0000000000000296 R15: ffffffff810f20ce
	FS:  00007f97116bc700(0000) GS:ffff88000a280000(0000) knlGS:0000000000000000
	CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
	CR2: 0000000000000001 CR3: 000000006a91c000 CR4: 00000000000006e0
	DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
	DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
	Process su (pid: 31245, threadinfo ffff88006af3a000, task ffff8800374414c0)
	Stack:
	 0000000512e0958e 0000000000008000 ffff880037f8d180 0000000000000001
	 0000000000000000 0000000000008001 ffff88007d199000 ffffffff810f20ce
	 0000000000008000 ffff88006af3be48 0000000000000024 ffffffff810face3
	Call Trace:
	 [<ffffffff810f20ce>] ? get_empty_filp+0x70/0x12f
	 [<ffffffff810face3>] ? do_filp_open+0x145/0x590
	 [<ffffffff810ce208>] ? tlb_finish_mmu+0x2a/0x33
	 [<ffffffff810ce43c>] ? unmap_region+0xd3/0xe2
	 [<ffffffff810e4393>] ? virt_to_head_page+0x9/0x2d
	 [<ffffffff81103916>] ? alloc_fd+0x69/0x10e
	 [<ffffffff810ef4ed>] ? do_sys_open+0x56/0xfc
	 [<ffffffff81008a02>] ? system_call_fastpath+0x16/0x1b
	Code: 0f 1f 44 00 00 49 89 c6 fa 66 0f 1f 44 00 00 65 4c 8b 04 25 60 e8 00 00 48 8b 45 00 49 01 c0 49 8b 18 48 85 db 74 0d 48 63 45 18 <48> 8b 04 03 49 89 00 eb 14 4c 89 f9 83 ca ff 44 89 e6 48 89 ef
	RIP  [<ffffffff810e61a3>] kmem_cache_alloc+0x5b/0xe9

This problem is that find_keyring_by_name does not confirm that the keyring is
valid before accepting it.

Skipping keyrings that have been reduced to a zero count seems the way to go.
To this end, use atomic_inc_not_zero() to increment the usage count and skip
the candidate keyring if that returns false.

The following script _may_ cause the bug to happen, but there's no guarantee
as the window of opportunity is small:

	#!/bin/sh
	LOOP=100000
	USER=dummy_user
	/bin/su -c "exit;" $USER || { /usr/sbin/adduser -m $USER; add=1; }
	for ((i=0; i<LOOP; i++))
	do
		/bin/su -c "echo '$i' > /dev/null" $USER
	done
	(( add == 1 )) && /usr/sbin/userdel -r $USER
	exit

Note that the nominated user must not be in use.

An alternative way of testing this may be:

	for ((i=0; i<100000; i++))
	do
		keyctl session foo /bin/true || break
	done >&/dev/null

as that uses a keyring named "foo" rather than relying on the user and
user-session named keyrings.
Reported-by: NToshiyuki Okajima <toshi.okajima@jp.fujitsu.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Tested-by: NToshiyuki Okajima <toshi.okajima@jp.fujitsu.com>
Acked-by: NSerge Hallyn <serue@us.ibm.com>
Signed-off-by: NJames Morris <jmorris@namei.org>
      cea7daa3
    • D
      KEYS: Fix RCU handling in key_gc_keyring() · cf8304e8
      由 David Howells 提交于 
      key_gc_keyring() needs to either hold the RCU read lock or hold the keyring
semaphore if it's going to scan the keyring's list.  Given that it only needs
to read the key list, and it's doing so under a spinlock, the RCU read lock is
the thing to use.

Furthermore, the RCU check added in e7b0a61b is
incorrect as holding the spinlock on key_serial_lock is not grounds for
assuming a keyring's pointer list can be read safely.  Instead, a simple
rcu_dereference() inside of the previously mentioned RCU read lock is what we
want.
Reported-by: NSerge E. Hallyn <serue@us.ibm.com>
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NSerge Hallyn <serue@us.ibm.com>
Acked-by: N"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Signed-off-by: NJames Morris <jmorris@namei.org>
      cf8304e8
    • D
      KEYS: Fix an RCU warning in the reading of user keys · d9a9b4ae
      由 David Howells 提交于 
      Fix an RCU warning in the reading of user keys:

===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
security/keys/user_defined.c:202 invoked rcu_dereference_check() without protection!

other info that might help us debug this:

rcu_scheduler_active = 1, debug_locks = 0
1 lock held by keyctl/3637:
 #0:  (&key->sem){+++++.}, at: [<ffffffff811a80ae>] keyctl_read_key+0x9c/0xcf

stack backtrace:
Pid: 3637, comm: keyctl Not tainted 2.6.34-rc5-cachefs #18
Call Trace:
 [<ffffffff81051f6c>] lockdep_rcu_dereference+0xaa/0xb2
 [<ffffffff811aa55f>] user_read+0x47/0x91
 [<ffffffff811a80be>] keyctl_read_key+0xac/0xcf
 [<ffffffff811a8a06>] sys_keyctl+0x75/0xb7
 [<ffffffff81001eeb>] system_call_fastpath+0x16/0x1b
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NSerge Hallyn <serue@us.ibm.com>
Signed-off-by: NJames Morris <jmorris@namei.org>
      d9a9b4ae
    • M
      ima: remove ACPI dependency · a674fa46
      由 Mimi Zohar 提交于 
      The ACPI dependency moved to the TPM, where it belongs.  Although
IMA per-se does not require access to the bios measurement log,
verifying the IMA boot aggregate does, which requires ACPI.

This patch prereq's 'TPM: ACPI/PNP dependency removal'
http://lkml.org/lkml/2010/5/4/378.
Signed-off-by: NMimi Zohar <zohar@us.ibm.com>
Reported-by: NJean-Christophe Dubois <jcd@tribudubois.net>
Acked-by: NSerge Hallyn <serue@us.ibm.com>
Tested-by: NSerge Hallyn <serue@us.ibm.com>
Signed-off-by: NJames Morris <jmorris@namei.org>
      a674fa46
    • D
      KEYS: Fix an RCU warning in the reading of user keys · e35ec2d2
      由 David Howells 提交于 
      Fix an RCU warning in the reading of user keys:

===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
security/keys/user_defined.c:202 invoked rcu_dereference_check() without protection!

other info that might help us debug this:

rcu_scheduler_active = 1, debug_locks = 0
1 lock held by keyctl/3637:
 #0:  (&key->sem){+++++.}, at: [<ffffffff811a80ae>] keyctl_read_key+0x9c/0xcf

stack backtrace:
Pid: 3637, comm: keyctl Not tainted 2.6.34-rc5-cachefs #18
Call Trace:
 [<ffffffff81051f6c>] lockdep_rcu_dereference+0xaa/0xb2
 [<ffffffff811aa55f>] user_read+0x47/0x91
 [<ffffffff811a80be>] keyctl_read_key+0xac/0xcf
 [<ffffffff811a8a06>] sys_keyctl+0x75/0xb7
 [<ffffffff81001eeb>] system_call_fastpath+0x16/0x1b
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      e35ec2d2
    • D
      KEYS: Fix an RCU warning · bfeb0360
      由 David Howells 提交于 
      Fix the following RCU warning:

===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
security/keys/request_key.c:116 invoked rcu_dereference_check() without protection!

other info that might help us debug this:

rcu_scheduler_active = 1, debug_locks = 0
1 lock held by keyctl/5372:
 #0:  (key_types_sem){.+.+.+}, at: [<ffffffff811a4e3d>] key_type_lookup+0x1c/0x70

stack backtrace:
Pid: 5372, comm: keyctl Not tainted 2.6.34-rc3-cachefs #150
Call Trace:
 [<ffffffff810515f8>] lockdep_rcu_dereference+0xaa/0xb2
 [<ffffffff811a9220>] call_sbin_request_key+0x156/0x2b6
 [<ffffffff811a4c66>] ? __key_instantiate_and_link+0xb1/0xdc
 [<ffffffff811a4cd3>] ? key_instantiate_and_link+0x42/0x5f
 [<ffffffff811a96b8>] ? request_key_auth_new+0x17b/0x1f3
 [<ffffffff811a8e00>] ? request_key_and_link+0x271/0x400
 [<ffffffff810aba6f>] ? kmem_cache_alloc+0xe1/0x118
 [<ffffffff811a8f1a>] request_key_and_link+0x38b/0x400
 [<ffffffff811a7b72>] sys_request_key+0xf7/0x14a
 [<ffffffff81052227>] ? trace_hardirqs_on_caller+0x10c/0x130
 [<ffffffff81393f5c>] ? trace_hardirqs_on_thunk+0x3a/0x3f
 [<ffffffff81001eeb>] system_call_fastpath+0x16/0x1b

This was caused by doing:

	[root@andromeda ~]# keyctl newring fred @s
	539196288
	[root@andromeda ~]# keyctl request2 user a a 539196288
	request_key: Required key not available
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      bfeb0360
  25. 29 4月, 2010 1 次提交
    • S
      selinux: generalize disabling of execmem for plt-in-heap archs · fcaaade1
      由 Stephen Smalley 提交于 
      On Tue, 2010-04-27 at 11:47 -0700, David Miller wrote:
> From: "Tom \"spot\" Callaway" <tcallawa@redhat.com>
> Date: Tue, 27 Apr 2010 14:20:21 -0400
>
> > [root@apollo ~]$ cat /proc/2174/maps
> > 00010000-00014000 r-xp 00000000 fd:00 15466577
> >  /sbin/mingetty
> > 00022000-00024000 rwxp 00002000 fd:00 15466577
> >  /sbin/mingetty
> > 00024000-00046000 rwxp 00000000 00:00 0
> >  [heap]
>
> SELINUX probably barfs on the executable heap, the PLT is in the HEAP
> just like powerpc32 and that's why VM_DATA_DEFAULT_FLAGS has to set
> both executable and writable.
>
> You also can't remove the CONFIG_PPC32 ifdefs in selinux, since
> because of the VM_DATA_DEFAULT_FLAGS setting used still in that arch,
> the heap will always have executable permission, just like sparc does.
> You have to support those binaries forever, whether you like it or not.
>
> Let's just replace the CONFIG_PPC32 ifdef in SELINUX with CONFIG_PPC32
> || CONFIG_SPARC as in Tom's original patch and let's be done with
> this.
>
> In fact I would go through all the arch/ header files and check the
> VM_DATA_DEFAULT_FLAGS settings and add the necessary new ifdefs to the
> SELINUX code so that other platforms don't have the pain of having to
> go through this process too.

To avoid maintaining per-arch ifdefs, it seems that we could just
directly use (VM_DATA_DEFAULT_FLAGS & VM_EXEC) as the basis for deciding
whether to enable or disable these checks.   VM_DATA_DEFAULT_FLAGS isn't
constant on some architectures but instead depends on
current->personality, but we want this applied uniformly.  So we'll just
use the initial task state to determine whether or not to enable these
checks.
Signed-off-by: NStephen Smalley <sds@tycho.nsa.gov>
Acked-by: NDavid S. Miller <davem@davemloft.net>
Signed-off-by: NJames Morris <jmorris@namei.org>
      fcaaade1
  27. 28 4月, 2010 3 次提交
    • D
      keys: the request_key() syscall should link an existing key to the dest keyring · 03449cd9
      由 David Howells 提交于 
      The request_key() system call and request_key_and_link() should make a
link from an existing key to the destination keyring (if supplied), not
just from a new key to the destination keyring.

This can be tested by:

	ring=`keyctl newring fred @s`
	keyctl request2 user debug:a a
	keyctl request user debug:a $ring
	keyctl list $ring

If it says:

	keyring is empty

then it didn't work.  If it shows something like:

	1 key in keyring:
	1070462727: --alswrv     0     0 user: debug:a

then it did.

request_key() system call is meant to recursively search all your keyrings for
the key you desire, and, optionally, if it doesn't exist, call out to userspace
to create one for you.

If request_key() finds or creates a key, it should, optionally, create a link
to that key from the destination keyring specified.

Therefore, if, after a successful call to request_key() with a desination
keyring specified, you see the destination keyring empty, the code didn't work
correctly.

If you see the found key in the keyring, then it did - which is what the patch
is required for.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Cc: James Morris <jmorris@namei.org>
Cc: <stable@kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      03449cd9
    • E
      LSM Audit: rename LSM_AUDIT_NO_AUDIT to LSM_AUDIT_DATA_NONE · cb84aa9b
      由 Eric Paris 提交于 
      Most of the LSM common audit work uses LSM_AUDIT_DATA_* for the naming.
This was not so for LSM_AUDIT_NO_AUDIT which means the generic initializer
cannot be used.  This patch just renames the flag so the generic
initializer can be used.
Signed-off-by: NEric Paris <eparis@redhat.com>
Signed-off-by: NJames Morris <jmorris@namei.org>
      cb84aa9b
    • D
      keys: don't need to use RCU in keyring_read() as semaphore is held · b59ec78c
      由 David Howells 提交于 
      keyring_read() doesn't need to use rcu_dereference() to access the keyring
payload as the caller holds the key semaphore to prevent modifications
from happening whilst the data is read out.

This should solve the following warning:

===================================================
[ INFO: suspicious rcu_dereference_check() usage. ]
---------------------------------------------------
security/keys/keyring.c:204 invoked rcu_dereference_check() without protection!

other info that might help us debug this:

rcu_scheduler_active = 1, debug_locks = 0
1 lock held by keyctl/2144:
 #0:  (&key->sem){+++++.}, at: [<ffffffff81177f7c>] keyctl_read_key+0x9c/0xcf

stack backtrace:
Pid: 2144, comm: keyctl Not tainted 2.6.34-rc2-cachefs #113
Call Trace:
 [<ffffffff8105121f>] lockdep_rcu_dereference+0xaa/0xb2
 [<ffffffff811762d5>] keyring_read+0x4d/0xe7
 [<ffffffff81177f8c>] keyctl_read_key+0xac/0xcf
 [<ffffffff811788d4>] sys_keyctl+0x75/0xb9
 [<ffffffff81001eeb>] system_call_fastpath+0x16/0x1b
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NJames Morris <jmorris@namei.org>
      b59ec78c
  29. 27 4月, 2010 1 次提交
  31. 25 4月, 2010 1 次提交
  33. 23 4月, 2010 3 次提交