peter/spectre-meltdown-checker
peter/spectre-meltdown-checker
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enh: arm: add experimental support for binary arm images

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This commit is contained in:
Stéphane Lesimple 2019-11-24 22:45:38 +01:00
parent 4a3006e196
commit 33cf1cde79
1 changed files with 10 additions and 3 deletions
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13
spectre-meltdown-checker.sh
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@ -1208,6 +1208,12 @@ check_kernel()
if [ "$_mode" = desperate ]; then
if "${opt_arch_prefix}strings" "$_file" | grep -Eq '^Linux version '; then
_debug "check_kernel (desperate): ... matched!"
if [ "$_readelf_sections" = 0 ] && grep -qF -e armv6 -e armv7 "$_file"; then
_debug "check_kernel (desperate): raw arm binary found, adjusting objdump options"
objdump_options="-D -b binary -marm"
else
objdump_options="-d"
fi
return 0
else
_debug "check_kernel (desperate): ... invalid"
@ -1216,6 +1222,7 @@ check_kernel()
if [ $ret -eq 0 ] && [ -z "$_readelf_warnings" ] && [ "$_readelf_sections" -gt 0 ]; then
if [ "$_kernel_size" -ge 100000 ]; then
_debug "check_kernel: ... file is valid"
objdump_options="-d"
return 0
else
_debug "check_kernel: ... file seems valid but is too small, ignoring"
@ -3176,7 +3183,7 @@ check_CVE_2017_5753_linux()
pstatus green YES "$ret occurrence(s) found of x86 32 bits array_index_mask_nospec()"
v1_mask_nospec="x86 32 bits array_index_mask_nospec"
else
ret=$("${opt_arch_prefix}objdump" -d "$kernel" | grep -w -e f3af8014 -e e320f014 -B2 | grep -B1 -w sbc | grep -w -c cmp)
ret=$("${opt_arch_prefix}objdump" $objdump_options "$kernel" | grep -w -e f3af8014 -e e320f014 -B2 | grep -B1 -w sbc | grep -w -c cmp)
if [ "$ret" -gt 0 ]; then
pstatus green YES "$ret occurrence(s) found of arm 32 bits array_index_mask_nospec()"
v1_mask_nospec="arm 32 bits array_index_mask_nospec"
@ -3225,7 +3232,7 @@ check_CVE_2017_5753_linux()
elif ! command -v "${opt_arch_prefix}objdump" >/dev/null 2>&1; then
pstatus yellow UNKNOWN "missing '${opt_arch_prefix}objdump' tool, please install it, usually it's in the binutils package"
else
"${opt_arch_prefix}objdump" -d "$kernel" | perl -ne 'push @r, $_; /\s(hint|csdb)\s/ && $r[0]=~/\ssub\s+(x\d+)/ && $r[1]=~/\sbic\s+$1,\s+$1,/ && $r[2]=~/\sand\s/ && exit(9); shift @r if @r>3'; ret=$?
"${opt_arch_prefix}objdump" $objdump_options "$kernel" | perl -ne 'push @r, $_; /\s(hint|csdb)\s/ && $r[0]=~/\ssub\s+(x\d+)/ && $r[1]=~/\sbic\s+$1,\s+$1,/ && $r[2]=~/\sand\s/ && exit(9); shift @r if @r>3'; ret=$?
if [ "$ret" -eq 9 ]; then
pstatus green YES "mask_nospec64 macro is present and used"
v1_mask_nospec="arm64 mask_nospec64"
@ -3278,7 +3285,7 @@ check_CVE_2017_5753_linux()
# so let's push the threshold to 70.
# v0.33+: now only count lfence opcodes after a jump, way less error-prone
# non patched kernel have between 0 and 20 matches, patched ones have at least 40-45
nb_lfence=$("${opt_arch_prefix}objdump" -d "$kernel" 2>/dev/null | grep -w -B1 lfence | grep -Ewc 'jmp|jne|je')
nb_lfence=$("${opt_arch_prefix}objdump" $objdump_options "$kernel" 2>/dev/null | grep -w -B1 lfence | grep -Ewc 'jmp|jne|je')
if [ "$nb_lfence" -lt 30 ]; then
pstatus yellow NO "only $nb_lfence jump-then-lfence instructions found, should be >= 30 (heuristic)"
else