Wrong size calculation in posix_execve

[Rhamphoryncus]

BPO	3070
Nosy	@loewis, @vstinner

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

Show more details

GitHub fields:

assignee = None
closed_at = <Date 2010-07-10.17:43:55.509>
created_at = <Date 2008-06-09.23:28:50.480>
labels = ['extension-modules', 'type-bug']
title = 'Wrong size calculation in posix_execve'
updated_at = <Date 2010-07-10.17:43:55.507>
user = 'https://bugs.python.org/Rhamphoryncus'

bugs.python.org fields:

activity = <Date 2010-07-10.17:43:55.507>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2010-07-10.17:43:55.509>
closer = 'vstinner'
components = ['Extension Modules']
creation = <Date 2008-06-09.23:28:50.480>
creator = 'Rhamphoryncus'
dependencies = []
files = []
hgrepos = []
issue_num = 3070
keywords = []
message_count = 3.0
messages = ['67880', '109895', '109902']
nosy_count = 4.0
nosy_names = ['loewis', 'Rhamphoryncus', 'vstinner', 'BreamoreBoy']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'test needed'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue3070'
versions = ['Python 3.1', 'Python 3.2']

[Rhamphoryncus]

In 2.x, the size of C string needed for an environment variable used by
posix_execve was calculated using PyString_GetSize. In 3.0 this is
translated to PyUnicode_GetSize. However, in 3.0 the C string is the
UTF-8 encoded version of the unicode object, which doesn't necessarily
have the same length as what PyUnicode_GetSize reports.

The simplest solution I see is to use strlen() instead.

[BreamoreBoy]

Any core C developers have any input on this one?

[vstinner]

Yes, I fixed it in 3.1 (r80494) and 3.2 (r80421): see issue bpo-8391.