peter/spectre-meltdown-checker
peter/spectre-meltdown-checker
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Replace head -1 by head -n1

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The info page of GNU head says:

> For compatibility 'head' also supports an obsolete option syntax
> '-[NUM][bkm][cqv]', [...] Scripts intended for standard hosts should use
> '-c NUM' or '-n NUM' instead.

At least busybox's head does not support the `-NUM` syntax.
This commit is contained in:
Jörg Sommer 2025-01-11 07:39:54 +01:00
parent 34c6095912
commit 0f36cb184b
1 changed files with 14 additions and 14 deletions
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28
spectre-meltdown-checker.sh
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@ -1892,7 +1892,7 @@ dmesg_grep()
# dmesg truncated
return 2
fi
dmesg_grepped=$(dmesg | grep -E "$1" | head -1)
dmesg_grepped=$(dmesg | grep -E "$1" | head -n1)
# not found:
[ -z "$dmesg_grepped" ] && return 1
# found, output is in $dmesg_grepped
@ -2186,8 +2186,8 @@ parse_cpu_details()
if [ -e "$procfs/cpuinfo" ]; then
if grep -qw avx2 "$procfs/cpuinfo" 2>/dev/null; then has_avx2=1; fi
if grep -qw avx512 "$procfs/cpuinfo" 2>/dev/null; then has_avx512=1; fi
cpu_vendor=$( grep '^vendor_id' "$procfs/cpuinfo" | awk '{print $3}' | head -1)
cpu_friendly_name=$(grep '^model name' "$procfs/cpuinfo" | cut -d: -f2- | head -1 | sed -e 's/^ *//')
cpu_vendor=$(grep '^vendor_id' "$procfs/cpuinfo" | awk '{print $3}' | head -n1)
cpu_friendly_name=$(grep '^model name' "$procfs/cpuinfo" | cut -d: -f2- | head -n1 | sed -e 's/^ *//')
# special case for ARM follows
if grep -qi 'CPU implementer[[:space:]]*:[[:space:]]*0x41' "$procfs/cpuinfo"; then
cpu_vendor='ARM'
@ -2211,10 +2211,10 @@ parse_cpu_details()
cpu_vendor='PHYTIUM'
fi
cpu_family=$( grep '^cpu family' "$procfs/cpuinfo" | awk '{print $4}' | grep -E '^[0-9]+$' | head -1)
cpu_model=$( grep '^model' "$procfs/cpuinfo" | awk '{print $3}' | grep -E '^[0-9]+$' | head -1)
cpu_stepping=$(grep '^stepping' "$procfs/cpuinfo" | awk '{print $3}' | grep -E '^[0-9]+$' | head -1)
cpu_ucode=$( grep '^microcode' "$procfs/cpuinfo" | awk '{print $3}' | head -1)
cpu_family=$( grep '^cpu family' "$procfs/cpuinfo" | awk '{print $4}' | grep -E '^[0-9]+$' | head -n1)
cpu_model=$( grep '^model' "$procfs/cpuinfo" | awk '{print $3}' | grep -E '^[0-9]+$' | head -n1)
cpu_stepping=$(grep '^stepping' "$procfs/cpuinfo" | awk '{print $3}' | grep -E '^[0-9]+$' | head -n1)
cpu_ucode=$( grep '^microcode' "$procfs/cpuinfo" | awk '{print $3}' | head -n1)
else
cpu_vendor=$( dmesg | grep -i -m1 'Origin=' | cut -f2 -w | cut -f2 -d= | cut -f2 -d\" )
cpu_family=$( dmesg | grep -i -m1 'Family=' | cut -f4 -w | cut -f2 -d= )
@ -2995,7 +2995,7 @@ else
kernel_version=$("${opt_arch_prefix}strings" "$kernel" 2>/dev/null | grep -E \
-e '^Linux version ' \
-e '^[[:alnum:]][^[:space:]]+ \([^[:space:]]+\) #[0-9]+ .+ (19|20)[0-9][0-9]$' \
-e '^FreeBSD [0-9]' | grep -v 'ABI compat' | head -1)
-e '^FreeBSD [0-9]' | grep -v 'ABI compat' | head -n1)
if [ -z "$kernel_version" ]; then
# try even harder with some kernels (such as ARM) that split the release (uname -r) and version (uname -v) in 2 adjacent strings
kernel_version=$("${opt_arch_prefix}strings" "$kernel" 2>/dev/null | grep -E -B1 '^#[0-9]+ .+ (19|20)[0-9][0-9]$' | tr "\n" " ")
@ -4245,7 +4245,7 @@ check_CVE_2017_5715_linux()
:
else
ibrs_can_tell=1
ibrs_supported=$("${opt_arch_prefix}strings" "$kernel" | grep -Fw -e ', IBRS_FW' | head -1)
ibrs_supported=$("${opt_arch_prefix}strings" "$kernel" | grep -Fw -e ', IBRS_FW' | head -n1)
if [ -n "$ibrs_supported" ]; then
_debug "ibrs: found ibrs evidence in kernel image ($ibrs_supported)"
ibrs_supported="found '$ibrs_supported' in kernel image"
@ -4266,7 +4266,7 @@ check_CVE_2017_5715_linux()
:
else
ibpb_can_tell=1
ibpb_supported=$("${opt_arch_prefix}strings" "$kernel" | grep -Fw -e 'ibpb' -e ', IBPB' | head -1)
ibpb_supported=$("${opt_arch_prefix}strings" "$kernel" | grep -Fw -e 'ibpb' -e ', IBPB' | head -n1)
if [ -n "$ibpb_supported" ]; then
_debug "ibpb: found ibpb evidence in kernel image ($ibpb_supported)"
ibpb_supported="found '$ibpb_supported' in kernel image"
@ -4857,7 +4857,7 @@ check_CVE_2017_5754_linux()
kpti_enabled=$(cat /sys/kernel/debug/x86/pti_enabled 2>/dev/null)
_debug "kpti_enabled: file /sys/kernel/debug/x86/pti_enabled exists and says: $kpti_enabled"
elif is_xen_dom0; then
pti_xen_pv_domU=$(xl dmesg | grep 'XPTI' | grep 'DomU enabled' | head -1)
pti_xen_pv_domU=$(xl dmesg | grep 'XPTI' | grep 'DomU enabled' | head -n1)
[ -n "$pti_xen_pv_domU" ] && kpti_enabled=1
fi
@ -5475,9 +5475,9 @@ check_CVE_2018_3646_linux()
pstatus green YES "unconditional flushes"
else
if is_xen_dom0; then
l1d_xen_hardware=$(xl dmesg | grep 'Hardware features:' | grep 'L1D_FLUSH' | head -1)
l1d_xen_hypervisor=$(xl dmesg | grep 'Xen settings:' | grep 'L1D_FLUSH' | head -1)
l1d_xen_pv_domU=$(xl dmesg | grep 'PV L1TF shadowing:' | grep 'DomU enabled' | head -1)
l1d_xen_hardware=$(xl dmesg | grep 'Hardware features:' | grep 'L1D_FLUSH' | head -n1)
l1d_xen_hypervisor=$(xl dmesg | grep 'Xen settings:' | grep 'L1D_FLUSH' | head -n1)
l1d_xen_pv_domU=$(xl dmesg | grep 'PV L1TF shadowing:' | grep 'DomU enabled' | head -n1)
if [ -n "$l1d_xen_hardware" ] && [ -n "$l1d_xen_hypervisor" ] && [ -n "$l1d_xen_pv_domU" ]; then
l1d_mode=5