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mmap crashes just on boundary. #49542

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mmap crashes just on boundary.#49542
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extension-modulesC modules in the Modules dirtype-crashA hard crash of the interpreter, possibly with a core dump

Description

@ocean-city
ocean-city
mannequin
opened on Feb 17, 2009
BPO 5292
Files
  • fix_segfault_on_boundary.patch
    		•

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

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    GitHub fields:

    assignee = None
closed_at = <Date 2009-02-17.10:13:42.160>
created_at = <Date 2009-02-17.09:35:55.773>
labels = ['extension-modules', 'type-crash']
title = 'mmap crashes just on boundary.'
updated_at = <Date 2009-02-17.10:13:42.158>
user = 'https://bugs.python.org/ocean-city'

    bugs.python.org fields:

    activity = <Date 2009-02-17.10:13:42.158>
actor = 'ocean-city'
assignee = 'none'
closed = True
closed_date = <Date 2009-02-17.10:13:42.160>
closer = 'ocean-city'
components = ['Extension Modules']
creation = <Date 2009-02-17.09:35:55.773>
creator = 'ocean-city'
dependencies = []
files = ['13115']
hgrepos = []
issue_num = 5292
keywords = ['patch']
message_count = 3.0
messages = ['82307', '82308', '82314']
nosy_count = 1.0
nosy_names = ['ocean-city']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'crash'
url = 'https://bugs.python.org/issue5292'
versions = ['Python 2.6', 'Python 3.0', 'Python 3.1', 'Python 2.7']

    Activity

    1. ocean-city commented on Feb 17, 2009

      @ocean-city
      ocean-citymannequin
      on Feb 17, 2009
      MannequinAuthor

      I noticed following code crashes. I'll post fix soon.

      import mmap
import os

def main():
	align = mmap.ALLOCATIONGRANULARITY
	path = os.path.splitext(__file__)[0] + ".txt"
	with open(path, "w") as f:
		f.write("0" * align)
		f.write("1" * align)
		f.write("2" * align)
	with open(path, "r+") as f:
		m = mmap.mmap(f.fileno(), align)
	m[align] # crash
        m[align] = '1' # crash too

if __name__ == '__main__':
	main()
    2. ocean-city
      added
      extension-modulesC modules in the Modules dir
      type-crashA hard crash of the interpreter, possibly with a core dump
      on Feb 17, 2009

    3. ocean-city commented on Feb 17, 2009

      @ocean-city
      ocean-citymannequin
      on Feb 17, 2009
      MannequinAuthor

      Here is a patch.

    4. ocean-city commented on Feb 17, 2009

      @ocean-city
      ocean-citymannequin
      on Feb 17, 2009
      MannequinAuthor

      This is obvious bug (and fix is obvious too), so I've commited in r69714.

    5. ocean-city
      closed this as completedon Feb 17, 2009
    6. ezio-melotti
      transferred this issue fromon Apr 10, 2022
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