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Le 11 févr. 2018 à 01:10, Stephane Sudre <dev.iceberg@gmail.com> a écrit :
Just for info.
There's a bug in the xar_from_base64 function of the b64.c file of the xar project (which is used in pkgutil and probably in PackageKit.framework).
The output of the function can be incorrect because the output array of unsigned chars is is not set to 0.
This is the bug:
output = malloc(3 * (inputLength / 4 + 1));
So in case output is allocated to some location that was previously used, the contents of output will not be a bunch of zeroes (so no terminating NULL char after the last decoded character). And anyway, it should not be assumed to be a bunch of zeroes.
It just happens that having a distribution package (.pkg) containing a Package name with some accented characters (such as é) will trigger the bug every single time when using pkgutil --expand or xar -tc
I’m not sure the accented char has anything to do with that. I would rather guess this is because your package malloc small enough space that the system don’t have to use the big malloc zone (which usually provide fresh pages that are zeroed lazily).
This problem can be reproduced on Mac OS X 10.10.5 and 10.11.6 with the Apple built binaries and it can be reproduced using the latest xar source code available on opensource.apple.com (xar-400). And based on what I see in xar-28, the problem is apparently there since Mac OS X 10.5.0.
Problem# 37427477
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