stack smashing detected with v1.0.5

[Evangelos Foutras]

I received a bug report [1] on Arch Linux's tracker.

The issue is that php-memcached (version 2.0.1) built against libmemcached 1.0.4 – but running against libmemcached 1.0.5 – produces a "stack smashing detected" error when it calls Memcached::getMulti().

This fault occurs only on x86_64 and not on i686 architectures.

There is no soname bump between libmemcached 1.0.4 and 1.0.5, so this shouldn't be happening. Rebuilding php-memcached against libmemcached 1.0.5 makes the issue go away.

Is there a change in libmemcached 1.0.5 that would cause this? The full error is included in the downstream report [1], but it may not provide many clues. I can provide additional information if that's requested.

[1] https://bugs.archlinux.org/task/29024

[Brian Aker (brianaker)]

My guess?

Somehow there is an ABI issue that wasn't detected during the last build cycle. We can bump it in 1.0.6 to force the fix.

[Brian Aker (brianaker)]

There was a shift in the usage of stddef header. That could have caused the issue (I am surprised, but it is the only difference detected).

[Evangelos Foutras (foutrelis)]

I'm attaching an automated report generated by ABI Compliance Checker [1].

I hope that it helps you better understand which change broke ABI compatibility in v1.0.5.

[1] http://ispras.linuxbase.org/index.php/ABI_compliance_checker

[Brian Aker (brianaker)]

What tool did you use to generate the the report?

I'm bumping the version for 1.0.6.

[Evangelos Foutras (foutrelis)]

I have included information about the tool used in my previous comment.

Thanks for fixing this.