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From: Sebastien Bourdeauducq <sb@m-labs.hk>
To: musl@lists.openwall.com
Subject: Re: [musl] building statically linked DSOs with musl
Date: Sat, 1 Jan 2022 22:31:58 +0800	[thread overview]
Message-ID: <54060b8f-2ff1-fa1c-abc7-ac4996858ffb@m-labs.hk> (raw)
In-Reply-To: <1641045086.i0hohehzro.none@localhost>

On 1/1/22 21:58, Alex Xu (Hello71) wrote:
> First,
> malloc implementations (may) use a process-global resource: (s)brk. It
> will cause havoc if multiple implementations attempt to simultaneously
> manipulate it. Second, even if no more than one implementation uses
> (s)brk, they will still have incompatible metadata.

Can't there be two different heaps in different memory regions?

> Consider the case
> where your plugin allocates some memory with malloc, then passes the
> pointer to Python which then frees it. Since an incompatible
> implementation is processing it, it will most likely destroy the heap or
> crash.

Well yes, that's a fairly obvious issue and we are not doing that; the 
side that allocates the memory is always the one that frees it.

Sébastien

  reply	other threads:[~2022-01-01 14:32 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-01  9:32 Sebastien Bourdeauducq
2022-01-01 12:56 ` Joakim Sindholt
2022-01-01 13:58   ` Alex Xu (Hello71)
2022-01-01 14:31     ` Sebastien Bourdeauducq [this message]
2022-01-02 21:41       ` Markus Wichmann
2022-01-03  1:37   ` Sebastien Bourdeauducq
2022-01-03  7:05     ` Markus Wichmann

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