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Cache results from meltdown checker

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This commit is contained in:
Alexandre Aubin 2019-02-19 17:57:38 +01:00
parent 10f3301061
commit ddf2b49d54
1 changed files with 20 additions and 0 deletions
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20
src/yunohost/tools.py
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@ -713,6 +713,23 @@ def tools_diagnosis(auth, private=False):
def _check_if_vulnerable_to_meltdown():
# meltdown CVE: https://security-tracker.debian.org/tracker/CVE-2017-5754
# We use a cache file to avoid re-running the script so many times,
# which can be expensive (up to around 5 seconds on ARM)
# and make the admin appear to be slow (c.f. the calls to diagnosis
# from the webadmin)
#
# The cache is in /tmp and shall disappear upon reboot
# *or* we compare it to dpkg.log modification time
# such that it's re-ran if there was package upgrades
# (e.g. from yunohost)
cache_file = "/tmp/yunohost-meltdown-diagnosis"
dpkg_log = "/var/log/dpkg.log"
print(os.path.exists(cache_file))
if os.path.exists(cache_file):
if not os.path.exists(dpkg_log) or os.path.getmtime(cache_file) > os.path.getmtime(dpkg_log):
logger.debug("Using cached results for meltdown checker, from %s" % cache_file)
return read_json(cache_file)[0]["VULNERABLE"]
# script taken from https://github.com/speed47/spectre-meltdown-checker
# script commit id is store directly in the script
file_dir = os.path.split(__file__)[0]
@ -722,6 +739,7 @@ def _check_if_vulnerable_to_meltdown():
# example output from the script:
# [{"NAME":"MELTDOWN","CVE":"CVE-2017-5754","VULNERABLE":false,"INFOS":"PTI mitigates the vulnerability"}]
try:
logger.debug("Running meltdown vulnerability checker")
call = subprocess.Popen("bash %s --batch json --variant 3" %
SCRIPT_PATH, shell=True,
stdout=subprocess.PIPE,
@ -752,6 +770,8 @@ def _check_if_vulnerable_to_meltdown():
logger.warning("Something wrong happened when trying to diagnose Meltdown vunerability, exception: %s" % e)
raise Exception("Command output for failed meltdown check: '%s'" % output)
logger.debug("Writing results from meltdown checker to cache file, %s" % cache_file)
write_to_json(cache_file, CVEs)
return CVEs[0]["VULNERABLE"]