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Date: Thu, 19 Apr 2018 20:27:44 +0200
From: Szabolcs Nagy <>
Subject: Re: tcmalloc compatibility

* Rich Felker <> [2018-04-18 16:35:56 -0400]:
> Today I pushed changes which should make malloc
> replacement/interposition work reliably as long as you only use
> AS-safe functions. If you try this, please let us know how it turns
> out and if you run into any unexpected problems.

there was a report on irc that this change in memalign has falsepositives:

-       if (len > SIZE_MAX - align) {
+       if (len > SIZE_MAX - align || free != __internal_free) {

in particular &free can point to a plt entry in the main executable
while &__internal_free is in so they compare unequal.

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