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From: Andrew Morton <akpm@linux-foundation.org>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] elf: fix "start_code" evaluation
Date: Thu, 23 May 2019 11:44:17 -0700	[thread overview]
Message-ID: <20190523114417.f99d781754ed22950115c64a@linux-foundation.org> (raw)
In-Reply-To: <20190523175736.GA6222@avx2>

On Thu, 23 May 2019 20:57:36 +0300 Alexey Dobriyan <adobriyan@gmail.com> wrote:

> Only executable ELF program headers should change ->start_code.
> 
> ...
>
> --- a/fs/binfmt_elf.c
> +++ b/fs/binfmt_elf.c
> @@ -1026,7 +1026,7 @@ static int load_elf_binary(struct linux_binprm *bprm)
>  			}
>  		}
>  		k = elf_ppnt->p_vaddr;
> -		if (k < start_code)
> +		if ((elf_ppnt->p_flags & PF_X) && k < start_code)
>  			start_code = k;
>  		if (start_data < k)
>  			start_data = k;

What problem does this solve?  How does it alter runtime behaviour? 
How do we know it won't break anything?


  reply	other threads:[~2019-05-23 18:44 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-23 17:57 Alexey Dobriyan
2019-05-23 18:44 ` Andrew Morton [this message]
2019-05-23 19:35   ` Alexey Dobriyan

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