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Re: [Chicken-hackers] [PATCH] Another argvector memcpy misuse causing se
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From: |
felix . winkelmann |
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Subject: |
Re: [Chicken-hackers] [PATCH] Another argvector memcpy misuse causing segfaults |
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Date: |
Sun, 06 Sep 2015 00:14:50 +0200 |
> Alexander Shendi reported that syntax-tests.scm triggered a segfault
> on OpenBSD 5.7, but only when compiling with clang. I was able to
> reproduce it in a VM, and the stack trace pointed to C_apply at
> runtime.c:5975.
>
> The stack trace contained a call to C_apply which was called from
> C_apply! That means that in some cases C_apply may call itself,
> and it will do so with C_temporary_stack_limit as the argvector.
> Then, when the second C_apply copies its argvector onto the
> temporary stack, that will trigger an overlapping copy onto the
> same memory region.
>
Signed off and pushed.
felix