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Re: [PATCH] linux-user: mremap fails with EFAULT if address range overla
From: |
Laurent Vivier |
Subject: |
Re: [PATCH] linux-user: mremap fails with EFAULT if address range overlaps with stack guard |
Date: |
Thu, 7 May 2020 16:35:49 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 |
Le 05/03/2020 à 22:05, Tobias Koch a écrit :
> If the address range starting at old_address overlaps with the stack guard it
> is invalid and mremap must fail with EFAULT. The musl c library relies on this
> behavior to detect the stack size, which it does by doing consecutive mremaps
> until it hits the stack guard. Without this patch, software (such as the Ruby
> interpreter) that calls pthread_getattr_np under musl will crash on 32 bit
> targets emulated on a 64 bit host.
Could you share some pointers to the code that is doing this?
We have already this kind of code in linux-user/elfload.c,
setup_arg_pages(): could you check why it doesn't work?
Thanks,
Laurent
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