[noPoll] Buffer overflow

[Francis Brosnan Blázquez]

Hello Miha,

Try to check if latest version from github.com fixes your issue:
https://github.com/ASPLes/nopoll/archive/master.zip  

If bug persists, build your solution with debug enabled (without
stripping symbols as it seems to happen given the backtrace) to get a
stack trace with line indications...otherwise, it will say you it is
breaking/jumping at nopoll_io_wait_select_add_to but not where...

At the same time, reading the function where segfault is happening:


                
                

..and the stack trace your are providing, it very likely the failure is
happening at:

	/* set the value */
	FD_SET (fds, &(select->set));

...and the only way for that to happen is that you are passing a
"select->" reference that was deallocated or a reference pointing to
nowhere. Obviously, this is a speculation without having the right
trace (though I'll bet the error is likely to be there).

Best Regards,





El vie, 04-08-2017 a las 15:01 +0200, Miha Nedok escribió:
> With the version 0.4.4.b349
> 
> I am getting:
> 
> 
> Aug  4 07:24:23 [73177]: *** buffer overflow detected
> ***: /usr/app/App terminated
> Aug  4 07:24:23 [73177]: ======= Backtrace: =========
> Aug  4 07:24:23
> [73177]: /lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7f1e282f57e5]
> Aug  4 07:24:23
> [73177]: /lib/x86_64-linux-gnu/libc.so.6(__fortify_fail
> +0x5c)[0x7f1e2839711c]
> Aug  4 07:24:23
> [73177]: /lib/x86_64-linux-gnu/libc.so.6(+0x117120)[0x7f1e28395120]
> Aug  4 07:24:23
> [73177]: /lib/x86_64-linux-gnu/libc.so.6(+0x119067)[0x7f1e28397067]
> Aug  4 07:24:23 [73177]: /usr/app/App(nopoll_io_wait_select_add_to
> +0x27)[0x4612f7]
> Aug  4 07:24:23 [73177]: /usr/app/App(nopoll_loop_register
> +0x3b)[0x460c2b]
> Aug  4 07:24:23 [73177]: /usr/app/App(nopoll_ctx_foreach_conn
> +0x7d)[0x457f5d]
> Aug  4 07:24:23 [73177]: /usr/app/App(nopoll_loop_wait+0x74)[0x460f84]
> 
> 
> And i cannot reproduce this on test server even if i put it on a lot
> of pressure
> with multiple clients.
> 
> 
> How can I help to debug this?
> 
> 
> 
> 
> 
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-- 
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