linux-kernel - Re: Kernel 3.18.55 compilation fails (missing function declaration)

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Date:   Thu, 8 Jun 2017 15:10:45 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Emmanuel Florac <eflorac@...ellique.com>,
        linux-kernel@...r.kernel.org
Subject: Re: Kernel 3.18.55 compilation fails (missing function declaration)

On 06/02/17 06:30, Emmanuel Florac wrote:
> Hi, kernel 3.18.55 compilation fails with this error:
> 
> kernel/fork.c: In function ‘dup_task_struct’:
> kernel/fork.c:341:2: error: implicit declaration of function
> ‘get_random_long’ [-Werror=implicit-function-declaration]
> tsk->stack_canary = get_random_long();
> 
> Corrected by adding the declaration to include/linux/random.h line 26 :
> 
>  unsigned long get_random_long(void);
> 
> Sorry, I really can't understand how to generate a patch from a tagged
> release, my git-fu is far too low...
> 

Should be fixed in 3.18.56 by this commit:


commit 2bc281ebacf969770597fad415547016f0457b53
Author: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Date:   Sat May 27 12:09:37 2017 +0200

    Revert "stackprotector: Increase the per-task stack canary's random range from 32 bits to 64 bits on 64-bit platforms"
    
    This reverts commit 609a3e81550b0b4ea87197b0f59455a7bcff975a which is
    commit 5ea30e4e58040cfd6434c2f33dc3ea76e2c15b05 upstream.
    
    It shouldn't have been backported to 3.18, as we do not have
    get_random_long() in that kernel tree.


-- 
~Randy