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push the lfence opcodes threshold to 70

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Stéphane Lesimple 2018-01-08 12:49:23 +01:00
parent 68adbfdf14
commit edbdf0da1f
1 changed files with 8 additions and 5 deletions
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13
spectre-meltdown-checker.sh
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@ -1,7 +1,7 @@
#! /bin/sh
# Spectre & Meltdown checker
# Stephane Lesimple
VERSION=0.12
VERSION=0.13
# print status function
pstatus()
@ -117,13 +117,16 @@ else
else
# here we disassemble the kernel and count the number of occurences of the LFENCE opcode
# in non-patched kernels, this has been empirically determined as being around 40-50
# in patched kernels, this is more around 70-80
# in patched kernels, this is more around 70-80, sometimes way higher (100+)
# v0.13: 68 found in a 3.10.23-xxxx-std-ipv6-64 (with lots of modules compiled-in directly), which doesn't have the LFENCE patches,
# so let's push the threshold to 70.
# TODO LKML patch is starting to dump LFENCE in favor of the PAUSE opcode, we might need to check that (patch not stabilized yet)
nb_lfence=$(objdump -D "$vmlinux" | grep -wc lfence)
if [ "$nb_lfence" -lt 60 ]; then
pstatus red NO "only $nb_lfence opcodes found, should be >= 60"
if [ "$nb_lfence" -lt 70 ]; then
pstatus red NO "only $nb_lfence opcodes found, should be >= 70"
status=1
else
pstatus green YES "$nb_lfence opcodes found, which is >= 60"
pstatus green YES "$nb_lfence opcodes found, which is >= 70"
status=2
fi
fi