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Use after free in Element.extend (2) #68280

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pkt mannequin opened this issue May 1, 2015 · 2 comments
Closed

Use after free in Element.extend (2) #68280

pkt mannequin opened this issue May 1, 2015 · 2 comments
Labels
extension-modules C modules in the Modules dir type-crash A hard crash of the interpreter, possibly with a core dump

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@pkt
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pkt mannequin commented May 1, 2015

BPO 24092
Nosy @scoder, @tiran, @serhiy-storchaka
Superseder
  • bpo-24091: Use after free in Element.extend (1)
    		•
    Files
  • poc_elt_extend2.py
    		•

    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 2015-05-02.20:36:25.002>
created_at = <Date 2015-05-01.13:57:05.361>
labels = ['extension-modules', 'type-crash']
title = 'Use after free in Element.extend (2)'
updated_at = <Date 2015-05-03.06:43:54.841>
user = 'https://bugs.python.org/pkt'

    bugs.python.org fields:

    activity = <Date 2015-05-03.06:43:54.841>
actor = 'Arfrever'
assignee = 'none'
closed = True
closed_date = <Date 2015-05-02.20:36:25.002>
closer = 'serhiy.storchaka'
components = ['Extension Modules']
creation = <Date 2015-05-01.13:57:05.361>
creator = 'pkt'
dependencies = []
files = ['39241']
hgrepos = []
issue_num = 24092
keywords = []
message_count = 2.0
messages = ['242306', '242431']
nosy_count = 6.0
nosy_names = ['scoder', 'christian.heimes', 'Arfrever', 'eli.bendersky', 'serhiy.storchaka', 'pkt']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '24091'
type = 'crash'
url = 'https://bugs.python.org/issue24092'
versions = ['Python 3.4', 'Python 3.5']
    @pkt
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    pkt mannequin commented May 1, 2015

    # Program received signal SIGSEGV, Segmentation fault.
    # 0x4063cf19 in element_extend (self=0x405ddf74, args=([],)) at /home/p/Python-3.4.1/Modules/elementtree.c:1056
    \bpo-1056 PyObject* element = PySequence_Fast_GET_ITEM(seq, i);
    # (gdb) print i
    # $3 = 1337
    # (gdb) print *(PyListObject*)seq
    # $4 = {ob_base = {ob_base = {ob_next = 0x406373ec, _ob_prev = 0x405ddf74, ob_refcnt = 3, ob_type = 0x830e1c0 <PyList_Type>},
    # ob_size = 0}, ob_item = 0x0, allocated = 0}
    #
    # Controlled read (resulting from a use after free). "seq" is cleared in a custom
    # destructor (Y.__del    ()).

    @pkt pkt mannequin added the type-crash A hard crash of the interpreter, possibly with a core dump label May 1, 2015
    @tiran tiran added the extension-modules C modules in the Modules dir label May 1, 2015
    @serhiy-storchaka
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    The patch for bpo-24091 fixes this issue.

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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