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fix(offline): report unknown when too few info

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In offline mode, in the worst case where an invalid
config file is given, and we have no vmlinux image
nor System.map, the script was reporting Variant 2
and Variant 3 as vulnerable in the global status.
Replace this by a proper pair of UNKNOWNs
This commit is contained in:
Stéphane Lesimple 2018-01-23 22:20:34 +01:00
parent c8a25c5d97
commit 3e454f1817
1 changed files with 15 additions and 3 deletions
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16
spectre-meltdown-checker.sh
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@ -928,7 +928,9 @@ check_variant2()
fi fi
_info_nol "* Kernel support for IBRS: " _info_nol "* Kernel support for IBRS: "
ibrs_can_tell=0
if [ "$opt_live" = 1 ]; then if [ "$opt_live" = 1 ]; then
ibrs_can_tell=1
mount_debugfs mount_debugfs
for ibrs_file in \ for ibrs_file in \
/sys/kernel/debug/ibrs_enabled \ /sys/kernel/debug/ibrs_enabled \
@ -962,6 +964,7 @@ check_variant2()
fi fi
fi fi
if [ "$ibrs_supported" != 1 -a -n "$opt_map" ]; then if [ "$ibrs_supported" != 1 -a -n "$opt_map" ]; then
ibrs_can_tell=1
if grep -q spec_ctrl "$opt_map"; then if grep -q spec_ctrl "$opt_map"; then
pstatus green YES pstatus green YES
ibrs_supported=1 ibrs_supported=1
@ -969,7 +972,12 @@ check_variant2()
fi fi
fi fi
if [ "$ibrs_supported" != 1 ]; then if [ "$ibrs_supported" != 1 ]; then
if [ "$ibrs_can_tell" = 1 ]; then
pstatus red NO pstatus red NO
else
# if we're in offline mode without System.map, we can't really know
pstatus yellow UNKNOWN "in offline mode, we need System.map to be able to tell"
fi
fi fi
_info_nol "* IBRS enabled for Kernel space: " _info_nol "* IBRS enabled for Kernel space: "
@ -1068,8 +1076,10 @@ check_variant2()
else else
if [ "$ibrs_supported" = 1 ]; then if [ "$ibrs_supported" = 1 ]; then
pvulnstatus CVE-2017-5715 OK "offline mode: IBRS will mitigate the vulnerability if enabled at runtime" pvulnstatus CVE-2017-5715 OK "offline mode: IBRS will mitigate the vulnerability if enabled at runtime"
else elif [ "$ibrs_can_tell" = 1 ]; then
pvulnstatus CVE-2017-5715 VULN "IBRS hardware + kernel support OR kernel with retpoline are needed to mitigate the vulnerability" pvulnstatus CVE-2017-5715 VULN "IBRS hardware + kernel support OR kernel with retpoline are needed to mitigate the vulnerability"
else
pvulnstatus CVE-2017-5715 UNK "offline mode: not enough information"
fi fi
fi fi
else else
@ -1235,8 +1245,10 @@ check_variant3()
else else
if [ "$kpti_support" = 1 ]; then if [ "$kpti_support" = 1 ]; then
pvulnstatus $cve OK "offline mode: PTI will mitigate the vulnerability if enabled at runtime" pvulnstatus $cve OK "offline mode: PTI will mitigate the vulnerability if enabled at runtime"
else elif [ "$kpti_can_tell" = 1 ]; then
pvulnstatus $cve VULN "PTI is needed to mitigate the vulnerability" pvulnstatus $cve VULN "PTI is needed to mitigate the vulnerability"
else
pvulnstatus $cve UNK "offline mode: not enough information"
fi fi
fi fi
else else