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https://github.com/clearml/dropbear
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c7b7c9a99d
This allows ASLR to re-randomize the address space for every connection, preventing some vulnerabilities from being exploitable by repeated probing. Overhead (memory and time) is yet to be confirmed. At present this is only enabled on Linux. Other BSD platforms with fexecve() would probably also work though have not been tested.
35 lines
944 B
Python
35 lines
944 B
Python
from pathlib import Path
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import sys
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from test_dropbear import *
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def test_reexec(request, dropbear):
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"""
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Tests that two consecutive connections have different address layouts.
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This indicates that re-exec makes ASLR work
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"""
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cmd = (Path(request.node.fspath).parent / "parent_dropbear_map.py").resolve()
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r = dbclient(request, cmd, capture_output=True, text=True)
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map1 = r.stdout.rstrip()
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print(r.stderr, file=sys.stderr)
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r.check_returncode()
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r = dbclient(request, cmd, capture_output=True, text=True)
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map2 = r.stdout.rstrip()
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print(r.stderr, file=sys.stderr)
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r.check_returncode()
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print(map1)
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print(map2)
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# expect something like
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# "563174d59000-563174d5d000 r--p 00000000 00:29 4242372 /home/matt/src/dropbear/build/dropbear"
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assert map1.endswith('/dropbear')
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assert ' r--p ' in map1
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a1 = map1.split()[0]
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a2 = map2.split()[0]
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print(a1)
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print(a2)
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# relocation addresses should differ
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assert a1 != a2
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