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ARM Cortex Whitelist & Cumulative Blacklist
Applies all information about vulnerabilities of ARM Cortex processors (from https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability). Whitelist & blacklist approach, using both vulnerable and non vulnerable status for each identified CPU, with vulnerabilities tracked cumulatively for multi CPU systems.
This commit is contained in:
Rob Gill
GitHub
@@ -341,70 +341,62 @@ is_cpu_vulnerable()
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if [ -n "$cpupart" ] && [ -n "$cpuarch" ]; then
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# Cortex-R7 and Cortex-R8 are real-time and only used in medical devices or such
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# I can't find their CPU part number, but it's probably not that useful anyway
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# model R7 R8 A8 A9 A12 A15 A17 A57 A72 A73 A75
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# part ? ? 0xc08 0xc09 0xc0c 0xc0f 0xc0e 0xd07 0xd08 0xd09 0xd0a
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# arch 7? 7? 7 7 7 7 7 8 8 8 8
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# model R7 R8 A9 A15 A17 A57 A72 A73 A75
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# part ? ? 0xc09 0xc0f 0xc0e 0xd07 0xd08 0xd09 0xd0a
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# arch 7? 7? 7 7 7 8 8 8 8
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#
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# variant 1 & variant 2
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if [ "$cpuarch" = 7 ] && echo "$cpupart" | grep -Eq '^0x(c08|c09|c0c|c0f|c0e)$'; then
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# armv7 vulnerable chips
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_debug "checking cpu$i: this armv7 vulnerable to spectre 1 & 2"
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# Whitelist identified non-vulnerable processors, use vulnerability information from
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# https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability
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#
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# Maintain cumulative check of vulnerabilities -
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# if at least one of the cpu is vulnerable, then the system is vulnerable
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if [ "$cpuarch" = 7 ] && echo "$cpupart" | grep -Eq '^0x(c0[89ce])$'; then
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variant1=vuln
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variant2=vuln
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[ -z "$variant3" ] && variant3=immune
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[ -z "$variant3a" ] && variant3a=immune
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[ -z "$variant4" ] && variant4=immune
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_debug "checking cpu$i: this armv7 non vulnerable to variants 3, 3a & 4"
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elif [ "$cpuarch" = 7 ] && echo "$cpupart" | grep -Eq '^0x(c0f)$'; then
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variant1=vuln
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variant2=vuln
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[ -z "$variant3" ] && variant3=immune
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variant3=vuln
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[ -z "$variant4" ] && variant4=immune
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_debug "checking cpu$i: this armv7 non vulnerable to variants 3 & 4"
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elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -Eq '^0x(d07|d08)$'; then
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variant1=vuln
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variant2=vuln
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variant3=vuln
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[ -z "$variant3a" ] && variant3a=immune
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[ -z "$variant4" ] && variant4=immune
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_debug "checking cpu$i: this armv7 non vulnerable to variants 3a & 4"
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elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -Eq '^0x(d09|d0b)$'; then
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variant1=vuln
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variant2=vuln
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elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -Eq '^0x(d07|d08|d09|d0a)$'; then
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# armv8 vulnerable chips
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_debug "checking cpu$i: this armv8 vulnerable to spectre 1 & 2"
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variant1=vuln
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variant2=vuln
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else
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_debug "checking cpu$i: this arm non vulnerable to 1 & 2"
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# others are not vulnerable
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[ -z "$variant1" ] && variant1=immune
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[ -z "$variant2" ] && variant2=immune
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fi
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# for variant3, only A75 is vulnerable
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if [ "$cpuarch" = 8 ] && [ "$cpupart" = 0xd0a ]; then
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_debug "checking cpu$i: arm A75 vulnerable to meltdown"
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variant3=vuln
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else
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_debug "checking cpu$i: this arm non vulnerable to meltdown"
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[ -z "$variant3" ] && variant3=immune
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fi
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# for variant3a, only A15/A57/A72 are vulnerable
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if [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -Eq '^0x(c0f|d07|d0a)$'; then
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_debug "checking cpu$i: arm A15-A57-A72 vulnerable to variant3a"
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variant3a=vuln
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else
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_debug "checking cpu$i: this arm non vulnerable to variant3a"
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[ -z "$variant3a" ] && variant3a=immune
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fi
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# for variant4, arch 7 immune, arch 8 A57-72-73-75-76 are vulnerable
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if [ "$cpuarch" = 7 ] && echo "$cpupart" | grep -Eq '^0x(c0[89cfe])$'; then
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_debug "checking cpu$i: arm A8-A9-A12-A15-A17 non vulnerable to variant4"
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variant4=immune
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elif [ "$cpuarch" = 8 ]; then
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_debug "checking cpu$i: arm A57-A72-A73-A75-A76 vulnerable to variant4"
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variant4=vuln
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_debug "checking cpu$i: this armv8 non vulnerable to variants 3 & 3a"
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elif [ "$cpuarch" = 8 ] && echo "$cpupart" | grep -Eq '^0x(c0a)$'; then
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variant1=vuln
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variant2=vuln
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variant3=vuln
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[ -z "$variant3a" ] && variant3a=immune
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variant4=vuln
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_debug "checking cpu$i: this armv8 non vulnerable to variant 3a"
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else
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_debug "checking cpu$i: unknown arm processor assumed vulnerable to variant4"
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[ -z "$variant4" ] && variant4=vuln
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variant1=vuln
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variant2=vuln
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variant3=vuln
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variant3a=vuln
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variant4=vuln
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_debug "checking cpu$i: this arm unknown"
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fi
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fi
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_debug "is_cpu_vulnerable: for cpu$i and so far, we have <$variant1> <$variant2> <$variant3> <$variant3a> <$variant4>"
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done
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fi
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# from the information we have for now, it seems that CPUs that are vulnerable to variant1 are also vulnerable to variant4
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[ -z "$variant4" ] && variant4=$variant1
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_debug "is_cpu_vulnerable: temp results are <$variant1> <$variant2> <$variant3> <$variant3a> <$variant4>"
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# if at least one of the cpu is vulnerable, then the system is vulnerable
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[ "$variant1" = "immune" ] && variant1=1 || variant1=0
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[ "$variant2" = "immune" ] && variant2=1 || variant2=0
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[ "$variant3" = "immune" ] && variant3=1 || variant3=0
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[ "$variant3a" = "immune" ] && variant3a=1 || variant3a=0
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[ "$variant4" = "immune" ] && variant4=1 || variant4=0
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_debug "is_cpu_vulnerable: final results are <$variant1> <$variant2> <$variant3> <$variant3a> <$variant4>"
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is_cpu_vulnerable_cached=1
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_is_cpu_vulnerable_cached "$1"
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