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From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: "Eric W. Biederman" <ebiederm@xmission.com>,
	Al Viro <viro@zeniv.linux.org.uk>
Cc: Casey Schaufler <casey@schaufler-ca.com>,
	Alexei Starovoitov <alexei.starovoitov@gmail.com>,
	linux-kernel@vger.kernel.org, David Miller <davem@davemloft.net>,
	Greg Kroah-Hartman <greg@kroah.com>,
	Kees Cook <keescook@chromium.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Alexei Starovoitov <ast@kernel.org>, bpf <bpf@vger.kernel.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Gary Lin <GLin@suse.com>, Bruno Meneguele <bmeneg@redhat.com>,
	LSM List <linux-security-module@vger.kernel.org>,
	Luis Chamberlain <mcgrof@kernel.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH v2 00/15] Make the user mode driver code a better citizen
Date: Sat, 4 Jul 2020 15:57:38 +0900
Message-ID: <ec6a6e18-d7aa-3072-c8dc-b925398b8409@i-love.sakura.ne.jp> (raw)
In-Reply-To: <87lfk0nslu.fsf@x220.int.ebiederm.org>

On 2020/07/04 7:25, Eric W. Biederman wrote:
> Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> writes:
> 
>> On 2020/07/02 22:08, Eric W. Biederman wrote:
>>>> By the way, commit 4a9d4b024a3102fc ("switch fput to task_work_add") says
>>>> that use of flush_delayed_fput() has to be careful. Al, is it safe to call
>>>> flush_delayed_fput() from blob_to_mnt() from umd_load_blob() (which might be
>>>> called from both kernel thread and from process context (e.g. init_module()
>>>> syscall by /sbin/insmod )) ?
>>>
>>> And __fput_sync needs to be even more careful.
>>> umd_load_blob is called in these changes without any locks held.
>>
>> But where is the guarantee that a thread which called flush_delayed_fput() waits for
>> the completion of processing _all_ "struct file" linked into delayed_fput_list ?
>> If some other thread or delayed_fput_work (scheduled by fput_many()) called
>> flush_delayed_fput() between blob_to_mnt()'s fput(file) and flush_delayed_fput()
>> sequence? blob_to_mnt()'s flush_delayed_fput() can miss the "struct file" which
>> needs to be processed before execve(), can't it?
> 
> As a module the guarantee is we call task_work_run.

No. It is possible that blob_to_mnt() is called by a kernel thread which was
started by init_module() syscall by /sbin/insmod .

> Built into the kernel the guarantee as best I can trace it is that
> kthreadd hasn't started, and as such nothing that is scheduled has run
> yet.

Have you ever checked how early the kthreadd (PID=2) gets started?

----------
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2306,6 +2306,7 @@ static __latent_entropy struct task_struct *copy_process(
        trace_task_newtask(p, clone_flags);
        uprobe_copy_process(p, clone_flags);

+       printk(KERN_INFO "Created PID: %u Comm: %s\n", p->pid, p->comm);
        return p;

 bad_fork_cancel_cgroup:
----------

----------
[    0.090757][    T0] pid_max: default: 65536 minimum: 512
[    0.090890][    T0] LSM: Security Framework initializing
[    0.090890][    T0] Mount-cache hash table entries: 8192 (order: 4, 65536 bytes, linear)
[    0.090890][    T0] Mountpoint-cache hash table entries: 8192 (order: 4, 65536 bytes, linear)
[    0.090890][    T0] Disabled fast string operations
[    0.090890][    T0] Last level iTLB entries: 4KB 1024, 2MB 1024, 4MB 1024
[    0.090890][    T0] Last level dTLB entries: 4KB 1024, 2MB 1024, 4MB 1024, 1GB 4
[    0.090890][    T0] Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization
[    0.090890][    T0] Spectre V2 : Spectre mitigation: kernel not compiled with retpoline; no mitigation available!
[    0.090890][    T0] Speculative Store Bypass: Mitigation: Speculative Store Bypass disabled via prctl and seccomp
[    0.090890][    T0] SRBDS: Unknown: Dependent on hypervisor status
[    0.090890][    T0] MDS: Mitigation: Clear CPU buffers
[    0.090890][    T0] Freeing SMP alternatives memory: 24K
[    0.090890][    T0] Created PID: 1 Comm: swapper/0
[    0.090890][    T0] Created PID: 2 Comm: swapper/0
[    0.090890][    T1] smpboot: CPU0: Intel(R) Core(TM) i5-4440S CPU @ 2.80GHz (family: 0x6, model: 0x3c, stepping: 0x3)
[    0.091000][    T2] Created PID: 3 Comm: kthreadd
[    0.091995][    T2] Created PID: 4 Comm: kthreadd
[    0.093028][    T2] Created PID: 5 Comm: kthreadd
[    0.093997][    T2] Created PID: 6 Comm: kthreadd
[    0.094995][    T2] Created PID: 7 Comm: kthreadd
[    0.096037][    T2] Created PID: 8 Comm: kthreadd
(...snipped...)
[    0.135716][    T2] Created PID: 13 Comm: kthreadd
[    0.135716][    T1] smp: Bringing up secondary CPUs ...
[    0.135716][    T2] Created PID: 14 Comm: kthreadd
[    0.135716][    T2] Created PID: 15 Comm: kthreadd
[    0.135716][    T2] Created PID: 16 Comm: kthreadd
[    0.135716][    T2] Created PID: 17 Comm: kthreadd
[    0.135716][    T2] Created PID: 18 Comm: kthreadd
[    0.135716][    T1] x86: Booting SMP configuration:
(...snipped...)
[    0.901990][    T1] pci 0000:00:00.0: Limiting direct PCI/PCI transfers
[    0.902145][    T1] pci 0000:00:0f.0: Video device with shadowed ROM at [mem 0x000c0000-0x000dffff]
[    0.902213][    T1] pci 0000:02:00.0: CLS mismatch (32 != 64), using 64 bytes
[    0.902224][    T1] Trying to unpack rootfs image as initramfs...
[    1.107993][    T1] Freeing initrd memory: 18876K
[    1.109049][    T1] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
[    1.111003][    T1] software IO TLB: mapped [mem 0xab000000-0xaf000000] (64MB)
[    1.112136][    T1] check: Scanning for low memory corruption every 60 seconds
[    1.115040][    T2] Created PID: 52 Comm: kthreadd
[    1.116110][    T1] workingset: timestamp_bits=46 max_order=20 bucket_order=0
[    1.120936][    T1] SGI XFS with ACLs, security attributes, verbose warnings, quota, no debug enabled
[    1.129626][    T2] Created PID: 53 Comm: kthreadd
[    1.131403][    T2] Created PID: 54 Comm: kthreadd
----------

kthreadd (PID=2) is created by swapper/0 (PID=0) immediately after init (PID=1) was created by
swapper/0 (PID=0). It is even before secondary CPUs are brought up, and far earlier than unpacking
initramfs.

And how can we prove that blob_to_mnt() is only called by a kernel thread before some kernel
thread that interferes fput() starts running? blob_to_mnt() needs to be prepared for being
called after many processes already started running.

> 
>> Also, I don't know how convoluted the dependency of all "struct file" linked into
>> delayed_fput_list might be, for there can be "struct file" which will not be a
>> simple close of tmpfs file created by blob_to_mnt()'s file_open_root() request.
>>
>> On the other hand, although __fput_sync() cannot be called from !PF_KTHREAD threads,
>> there is a guarantee that __fput_sync() waits for the completion of "struct file"
>> which needs to be flushed before execve(), isn't there?
> 
> There is really not a good helper or helpers, and this code suggests we
> have something better.  Right now I have used the existing helpers to
> the best of my ability.  If you or someone else wants to write a better
> version of flushing so that exec can happen be my guest.
> 
> As far as I can tell what I have is good enough.

Just saying what you think is not a "review". I'm waiting for answer from Al Viro
because I consider that Al will be the most familiar with fput()'s behavior.
At least I consider that

	if (current->flags & PF_KTHREAD) {
		__fput_sync(file);
	} else {
		fput(file);
		task_work_run();
	}

is a candidate for closing the race window. And depending on Al's answer,
removing

	BUG_ON(!(task->flags & PF_KTHREAD));

 from __fput_sync() and unconditionally using

	__fput_sync(file);

 from blob_to_mnt() might be the better choice. Anyway, I consider that
Al's response is important for this "review".

> 
>>> We fundamentally AKA in any correct version of this code need to flush
>>> the file descriptor before we call exec or exec can not open it a
>>> read-only denying all writes from any other opens.
>>>
>>> The use case of flush_delayed_fput is exactly the same as that used
>>> when loading the initramfs.
>>
>> When loading the initramfs, the number of threads is quite few (which
>> means that the possibility of hitting the race window and convoluted
>> dependency is small).
> 
> But the reality is the code run very early, before the initramfs is
> initialized in practice.

Such expectation is not a reality.

> 
>> But like EXPORT_SYMBOL_GPL(umd_load_blob) indicates, blob_to_mnt()'s
>> flush_delayed_fput() might be called after many number of threads already
>> started running.
> 
> At which point the code probably won't be runnig from a kernel thread
> but instead will be running in a thread where task_work_run is relevant.

No. It is possible that blob_to_mnt() is called by a kernel thread which was
started by init_module() syscall by /sbin/insmod .

> 
> At worst it is a very small race, where someone else in another thread
> starts flushing the file.  Which means the file could still be
> completely close before exec.   Even that is not necessarily fatal,
> as the usermode driver code has a respawn capability.
> 
> Code that is used enough that it hits that race sounds like a very
> good problem to have from the perspective of the usermode driver code.

In general, unconditionally retrying call_usermodehelper() when it returned
a negative value (e.g. -ENOENT, -ENOMEM, -EBUSY) is bad. I don't know which
code is an implementation of "a respawn capability"; I'd like to check where
that code is and whether that code is checking -ETXTBSY.


  reply index

Thread overview: 194+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20200329005528.xeKtdz2A0%akpm@linux-foundation.org>
     [not found] ` <13fb3ab7-9ab1-b25f-52f2-40a6ca5655e1@i-love.sakura.ne.jp>
     [not found]   ` <202006051903.C44988B@keescook>
2020-06-06 19:20     ` [RFC][PATCH] net/bpfilter: Remove this broken and apparently unmantained Eric W. Biederman
2020-06-06 20:19       ` Alexei Starovoitov
2020-06-06 22:33         ` Linus Torvalds
2020-06-07  1:49           ` Alexei Starovoitov
2020-06-07  2:19             ` Linus Torvalds
2020-06-07 16:09               ` Eric W. Biederman
2020-06-08 16:20               ` Alexei Starovoitov
2020-06-08 16:40                 ` Greg KH
2020-06-08 18:35                 ` Kees Cook
2020-06-09  1:26                   ` Alexei Starovoitov
2020-06-09 15:37                     ` Kees Cook
2020-06-09 19:51                 ` Eric W. Biederman
2020-06-07  2:31             ` Tetsuo Handa
2020-06-08 16:23               ` Alexei Starovoitov
2020-06-08 23:22                 ` Tetsuo Handa
2020-06-09  1:28                   ` Alexei Starovoitov
2020-06-09  5:29                     ` Tetsuo Handa
2020-06-09 22:32                       ` Alexei Starovoitov
2020-06-09 23:30                         ` Tetsuo Handa
2020-06-10  0:05                           ` Alexei Starovoitov
2020-06-10  3:08                             ` Tetsuo Handa
2020-06-10  3:32                               ` Alexei Starovoitov
2020-06-10  7:30                                 ` Tetsuo Handa
2020-06-10 16:24                                   ` Casey Schaufler
2020-06-09 20:02                 ` Eric W. Biederman
2020-06-09 23:56                   ` Alexei Starovoitov
2020-06-10 21:12                     ` Eric W. Biederman
2020-06-11 23:31                       ` Alexei Starovoitov
2020-06-12  0:57                         ` Tetsuo Handa
2020-06-13  3:38                           ` Alexei Starovoitov
2020-06-13  4:22                             ` Tetsuo Handa
2020-06-13 14:08                         ` Eric W. Biederman
2020-06-13 15:33                           ` Alexei Starovoitov
2020-06-13 16:14                             ` Alexei Starovoitov
2020-06-14 14:51                               ` Eric W. Biederman
2020-06-16  1:55                                 ` Alexei Starovoitov
2020-06-16 16:21                                   ` Alexei Starovoitov
2020-06-23 18:04                                   ` Eric W. Biederman
2020-06-23 18:35                                     ` Alexei Starovoitov
2020-06-23 18:53                                       ` Eric W. Biederman
2020-06-23 19:40                                         ` Alexei Starovoitov
2020-06-24  1:51                                           ` Tetsuo Handa
2020-06-24  4:00                                             ` Alexei Starovoitov
2020-06-24  4:58                                               ` Tetsuo Handa
2020-06-24  6:39                                                 ` Alexei Starovoitov
2020-06-24  7:05                                                   ` Tetsuo Handa
2020-06-24 15:41                                                     ` Casey Schaufler
2020-06-24 17:54                                                       ` Alexei Starovoitov
2020-06-24 19:48                                                         ` Casey Schaufler
2020-06-24  6:05                                               ` Alexei Starovoitov
2020-06-24 14:18                                                 ` Alexei Starovoitov
2020-06-24 12:13                                           ` Eric W. Biederman
2020-06-24 14:26                                             ` Alexei Starovoitov
2020-06-24 23:14                                               ` Tetsuo Handa
2020-06-25  1:35                                                 ` Alexei Starovoitov
2020-06-25  6:38                                                   ` Tetsuo Handa
2020-06-25  9:57                                                     ` Greg KH
2020-06-25 11:03                                                       ` Tetsuo Handa
2020-06-25 12:07                                                         ` Greg KH
2020-06-25 14:21                                                           ` Tetsuo Handa
2020-06-25 19:34                                                           ` David Miller
2020-06-26  1:36                                                             ` Linus Torvalds
2020-06-26  1:51                                                               ` Alexei Starovoitov
2020-06-26  4:58                                                                 ` Tetsuo Handa
2020-06-26  5:41                                                                   ` Alexei Starovoitov
2020-06-26  6:20                                                                     ` Tetsuo Handa
2020-06-26  6:39                                                                       ` Alexei Starovoitov
2020-06-26 12:51                                                               ` [PATCH 00/14] Make the user mode driver code a better citizen Eric W. Biederman
2020-06-26 12:53                                                                 ` [PATCH 01/14] umh: Capture the pid in umh_pipe_setup Eric W. Biederman
2020-06-26 12:53                                                                 ` [PATCH 02/14] umh: Move setting PF_UMH into umh_pipe_setup Eric W. Biederman
2020-06-26 12:54                                                                 ` [PATCH 03/14] umh: Rename the user mode driver helpers for clarity Eric W. Biederman
2020-06-26 12:54                                                                 ` [PATCH 04/14] umh: Remove call_usermodehelper_setup_file Eric W. Biederman
2020-06-26 12:55                                                                 ` [PATCH 05/14] umh: Separate the user mode driver and the user mode helper support Eric W. Biederman
2020-06-26 14:17                                                                   ` kernel test robot
2020-06-26 16:22                                                                   ` Tetsuo Handa
2020-06-26 16:45                                                                     ` Eric W. Biederman
2020-06-27  1:26                                                                       ` Tetsuo Handa
2020-06-27  4:21                                                                         ` Eric W. Biederman
2020-06-27  4:36                                                                           ` Tetsuo Handa
2020-06-26 12:55                                                                 ` [PATCH 06/14] umd: For clarity rename umh_info umd_info Eric W. Biederman
2020-06-26 15:37                                                                   ` Kees Cook
2020-06-26 16:31                                                                     ` Eric W. Biederman
2020-06-26 12:56                                                                 ` [PATCH 07/14] umd: Rename umd_info.cmdline umd_info.driver_name Eric W. Biederman
2020-06-26 12:56                                                                 ` [PATCH 08/14] umd: Transform fork_usermode_blob into fork_usermode_driver Eric W. Biederman
2020-06-26 12:57                                                                 ` [PATCH 09/14] umh: Stop calling do_execve_file Eric W. Biederman
2020-06-26 12:57                                                                 ` [PATCH 10/14] exec: Remove do_execve_file Eric W. Biederman
2020-06-26 12:58                                                                 ` [PATCH 11/14] bpfilter: Move bpfilter_umh back into init data Eric W. Biederman
2020-06-26 12:58                                                                 ` [PATCH 12/14] umd: Track user space drivers with struct pid Eric W. Biederman
2020-06-26 12:59                                                                 ` [PATCH 13/14] bpfilter: Take advantage of the facilities of " Eric W. Biederman
2020-06-26 12:59                                                                 ` [PATCH 14/14] umd: Remove exit_umh Eric W. Biederman
2020-06-26 13:48                                                                 ` [PATCH 00/14] Make the user mode driver code a better citizen Eric W. Biederman
2020-06-29 19:55                                                                   ` [PATCH v2 00/15] " Eric W. Biederman
2020-06-29 19:56                                                                     ` [PATCH v2 01/15] umh: Capture the pid in umh_pipe_setup Eric W. Biederman
2020-06-29 19:57                                                                     ` [PATCH v2 02/15] umh: Move setting PF_UMH into umh_pipe_setup Eric W. Biederman
2020-06-29 19:57                                                                     ` [PATCH v2 03/15] umh: Rename the user mode driver helpers for clarity Eric W. Biederman
2020-06-29 19:59                                                                     ` [PATCH v2 04/15] umh: Remove call_usermodehelper_setup_file Eric W. Biederman
2020-06-29 20:00                                                                     ` [PATCH v2 05/15] umh: Separate the user mode driver and the user mode helper support Eric W. Biederman
2020-06-30 16:58                                                                       ` Linus Torvalds
2020-07-01 17:18                                                                         ` Eric W. Biederman
2020-07-01 17:42                                                                           ` Alexei Starovoitov
2020-06-29 20:01                                                                     ` [PATCH v2 06/15] umd: For clarity rename umh_info umd_info Eric W. Biederman
2020-06-29 20:02                                                                     ` [PATCH v2 07/15] umd: Rename umd_info.cmdline umd_info.driver_name Eric W. Biederman
2020-06-29 20:03                                                                     ` [PATCH v2 08/15] umd: Transform fork_usermode_blob into fork_usermode_driver Eric W. Biederman
2020-06-29 20:03                                                                     ` [PATCH v2 09/15] umh: Stop calling do_execve_file Eric W. Biederman
2020-06-29 20:04                                                                     ` [PATCH v2 10/15] exec: Remove do_execve_file Eric W. Biederman
2020-06-30  5:43                                                                       ` Christoph Hellwig
2020-06-30 12:14                                                                         ` Eric W. Biederman
2020-06-30 13:38                                                                           ` Christoph Hellwig
2020-06-30 14:28                                                                             ` Eric W. Biederman
2020-06-30 16:55                                                                               ` Alexei Starovoitov
2020-06-29 20:05                                                                     ` [PATCH v2 11/15] bpfilter: Move bpfilter_umh back into init data Eric W. Biederman
2020-06-29 20:06                                                                     ` [PATCH v2 12/15] umd: Track user space drivers with struct pid Eric W. Biederman
2020-06-29 20:06                                                                     ` [PATCH v2 13/15] bpfilter: Take advantage of the facilities of " Eric W. Biederman
2020-06-29 20:07                                                                     ` [PATCH v2 14/15] umd: Remove exit_umh Eric W. Biederman
2020-06-29 20:08                                                                     ` [PATCH v2 15/15] umd: Stop using split_argv Eric W. Biederman
2020-06-29 22:12                                                                     ` [PATCH v2 00/15] Make the user mode driver code a better citizen Alexei Starovoitov
2020-06-30  1:13                                                                       ` Eric W. Biederman
2020-06-30  6:16                                                                         ` Tetsuo Handa
2020-06-30 12:29                                                                       ` Eric W. Biederman
2020-06-30 13:21                                                                         ` Tetsuo Handa
2020-07-02 13:08                                                                           ` Eric W. Biederman
2020-07-02 13:40                                                                             ` Tetsuo Handa
2020-07-02 16:02                                                                               ` Eric W. Biederman
2020-07-03 13:19                                                                                 ` Tetsuo Handa
2020-07-03 22:25                                                                                   ` Eric W. Biederman
2020-07-04  6:57                                                                                     ` Tetsuo Handa [this message]
2020-07-08  4:46                                                                                       ` Eric W. Biederman
2020-06-30 16:52                                                                         ` Alexei Starovoitov
2020-07-01 17:12                                                                           ` Eric W. Biederman
2020-07-02 16:40                                                                     ` [PATCH v3 00/16] " Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 01/16] umh: Capture the pid in umh_pipe_setup Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 02/16] umh: Move setting PF_UMH into umh_pipe_setup Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 03/16] umh: Rename the user mode driver helpers for clarity Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 04/16] umh: Remove call_usermodehelper_setup_file Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 05/16] umh: Separate the user mode driver and the user mode helper support Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 06/16] umd: For clarity rename umh_info umd_info Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 07/16] umd: Rename umd_info.cmdline umd_info.driver_name Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 08/16] umd: Transform fork_usermode_blob into fork_usermode_driver Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 09/16] umh: Stop calling do_execve_file Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 10/16] exec: Remove do_execve_file Eric W. Biederman
2020-07-08  6:35                                                                         ` Luis Chamberlain
2020-07-08 12:41                                                                           ` Luis Chamberlain
2020-07-08 13:08                                                                             ` Eric W. Biederman
2020-07-08 13:32                                                                               ` Luis Chamberlain
2020-07-12 21:02                                                                         ` Pavel Machek
2020-07-02 16:41                                                                       ` [PATCH v3 11/16] bpfilter: Move bpfilter_umh back into init data Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 12/16] umd: Track user space drivers with struct pid Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 13/16] exit: Factor thread_group_exited out of pidfd_poll Eric W. Biederman
2020-07-03 20:30                                                                         ` Alexei Starovoitov
2020-07-03 21:37                                                                           ` Eric W. Biederman
2020-07-04  0:03                                                                             ` Alexei Starovoitov
2020-07-04 15:50                                                                             ` Christian Brauner
2020-07-07 17:09                                                                               ` Eric W. Biederman
2020-07-08  0:05                                                                                 ` Daniel Borkmann
2020-07-08  3:50                                                                                   ` Eric W. Biederman
2020-07-04 16:00                                                                         ` Christian Brauner
2020-07-02 16:41                                                                       ` [PATCH v3 14/16] bpfilter: Take advantage of the facilities of struct pid Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 15/16] umd: Remove exit_umh Eric W. Biederman
2020-07-02 16:41                                                                       ` [PATCH v3 16/16] umd: Stop using split_argv Eric W. Biederman
2020-07-02 23:51                                                                       ` [PATCH v3 00/16] Make the user mode driver code a better citizen Tetsuo Handa
2020-07-09 22:05                                                                       ` [merged][PATCH " Eric W. Biederman
2020-07-14 19:42                                                                         ` Alexei Starovoitov
2020-07-08  5:20                                                                     ` [PATCH v2 00/15] " Luis Chamberlain
2020-06-26 14:10                                                                 ` [PATCH 00/14] " Greg Kroah-Hartman
2020-06-26 16:40                                                                 ` Alexei Starovoitov
2020-06-26 17:17                                                                   ` Eric W. Biederman
2020-06-26 18:22                                                                     ` Alexei Starovoitov
2020-06-27 11:38                                                                 ` Tetsuo Handa
2020-06-27 12:59                                                                   ` Eric W. Biederman
2020-06-27 13:57                                                                     ` Tetsuo Handa
2020-06-28 19:44                                                                       ` Alexei Starovoitov
2020-06-29  2:20                                                                         ` Tetsuo Handa
2020-06-29 20:19                                                                           ` Eric W. Biederman
2020-06-30  6:28                                                                             ` Tetsuo Handa
2020-06-30 12:32                                                                               ` Eric W. Biederman
2020-06-30 16:48                                                                               ` Alexei Starovoitov
2020-06-30 21:54                                                                                 ` Tetsuo Handa
2020-06-30 21:57                                                                                   ` Alexei Starovoitov
2020-06-30 22:58                                                                                     ` Tetsuo Handa
2020-06-25 12:56                                                 ` [RFC][PATCH] net/bpfilter: Remove this broken and apparently unmantained Stephen Smalley
2020-06-25 13:25                                                   ` Greg Kroah-Hartman
2020-06-25 14:26                                                     ` Stephen Smalley
2020-06-25 14:36                                                       ` Stephen Smalley
2020-06-25 15:21                                                       ` Tetsuo Handa
2020-06-25 16:03                                                         ` Stephen Smalley
2020-06-25 16:06                                                         ` Casey Schaufler
2020-06-26 11:30                                               ` Eric W. Biederman
2020-06-07  5:58             ` Eric W. Biederman
2020-06-07 11:56               ` Eric W. Biederman
2020-06-08 16:35                 ` Alexei Starovoitov
2020-06-08 16:33               ` Alexei Starovoitov
2020-06-06 20:43       ` Matthew Wilcox
2020-06-07 15:51         ` Eric W. Biederman
2020-06-07  1:13       ` Tetsuo Handa

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