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Subject: Re: [GIT PULL] Please pull proc and exec work for 5.7-rc1
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     "Eric W. Biederman" <ebiederm@xmission.com>,
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        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
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        Oleg Nesterov <oleg@redhat.com>
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From:   Bernd Edlinger <bernd.edlinger@hotmail.de>
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On 4/9/20 7:37 PM, Linus Torvalds wrote:
> On Thu, Apr 9, 2020 at 10:17 AM Bernd Edlinger
> <bernd.edlinger@hotmail.de> wrote:
>>
>> Just for reference, I used Oleg's test case,
>> and improved it a bit.
> 
> I'm sure the test-case got posted somewhere, but mind sending it to me
> (or just pointing me at it?)
> 


No problem looks like you already swallowed the hook :-)
look at the following commit in your tree:

commit 2de4e82318c7f9d34f4b08599a612cd4cd10bf0b
Author: Bernd Edlinger <bernd.edlinger@hotmail.de>
Date:   Fri Mar 20 21:26:19 2020 +0100

    selftests/ptrace: add test cases for dead-locks
    
    This adds test cases for ptrace deadlocks.
    
    Additionally fixes a compile problem in get_syscall_info.c,
    observed with gcc-4.8.4:
    
    get_syscall_info.c: In function 'get_syscall_info':
    get_syscall_info.c:93:3: error: 'for' loop initial declarations are only
                                     allowed in C99 mode
       for (unsigned int i = 0; i < ARRAY_SIZE(args); ++i) {
       ^
    get_syscall_info.c:93:3: note: use option -std=c99 or -std=gnu99 to compile
                                   your code
    
    Signed-off-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
    Reviewed-by: Kees Cook <keescook@chromium.org>
    Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>


Test case 1/2 is working 2/2 is failing, deadlocking,
I think even the time-out handler does not kill the dead-lock
if I remember correctly.

And sorry, I anticipated part 15/16 and 16/16 would be pulled at the
same time, so the glitch would not be visible by now.


Bernd.

>              Linus
>