[Python-Dev] segfaults due to hash randomization in C OrderedDict
python at mrabarnett.plus.com
Fri May 22 00:41:47 CEST 2015
On 2015-05-21 23:17, Eric Snow wrote:
> On Thu, May 21, 2015 at 4:06 PM, MRAB <python at mrabarnett.plus.com> wrote:
> > On 2015-05-21 22:52, Eric Snow wrote:
> >> Good catch. Unfortunately, sticking "keys = ((PyDictObject
> >> *)od)->ma_keys;" right after "hash = ..." did not make a difference.
> >> I still get the same segfault.
> > So, does it change sometimes?
> The segfault is consistent if I use the same seed (e.g. 7):
> PYTHONHASHSEED=7 ./python -m test.regrtest -m test_basic
> Some seeds always segfault and some seeds never segfault.
OK, another thought.
In "_odict_get_index" again, you say that if the hash has changed, the
been resized, but could the dict be resized _without_ the hash changing?
Could the value of "keys" still become invalid even if the hash is the same?
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