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https://github.com/speed47/spectre-meltdown-checker
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refactor: no longer display the retoline-aware compiler test when we can't tell for sure
This commit is contained in:
Stéphane Lesimple
parent
6a48251647
commit
8606e60ef7
@ -2207,73 +2207,61 @@ check_variant2_linux()
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pstatus yellow UNKNOWN "couldn't read your kernel configuration"
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fi
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_info_nol " * Kernel compiled with a retpoline-aware compiler: "
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# Now check if the compiler used to compile the kernel knows how to insert retpolines in generated asm
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# For gcc, this is -mindirect-branch=thunk-extern (detected by the kernel makefiles)
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# See gcc commit https://github.com/hjl-tools/gcc/commit/23b517d4a67c02d3ef80b6109218f2aadad7bd79
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# In latest retpoline LKML patches, the noretpoline_setup symbol exists only if CONFIG_RETPOLINE is set
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# *AND* if the compiler is retpoline-compliant, so look for that symbol
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#
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# if there is "retpoline" in the file and NOT "minimal", then it's full retpoline
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# (works for vanilla and Red Hat variants)
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if [ "$opt_live" = 1 ] && [ -e "/sys/devices/system/cpu/vulnerabilities/spectre_v2" ]; then
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if grep -qwi retpoline /sys/devices/system/cpu/vulnerabilities/spectre_v2; then
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if grep -qwi minimal /sys/devices/system/cpu/vulnerabilities/spectre_v2; then
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pstatus yellow NO "kernel reports minimal retpoline compilation"
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else
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retpoline_compiler=1
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pstatus green YES "kernel reports full retpoline compilation"
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fi
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else
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if [ "$retpoline" = 1 ]; then
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pstatus yellow UNKNOWN
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else
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pstatus yellow NO
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fi
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fi
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elif [ -n "$opt_map" ]; then
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# look for the symbol
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if grep -qw noretpoline_setup "$opt_map"; then
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retpoline_compiler=1
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pstatus green YES "noretpoline_setup symbol found in System.map"
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else
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if [ "$retpoline" = 1 ]; then
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pstatus yellow UNKNOWN
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else
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pstatus yellow NO
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fi
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fi
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elif [ -n "$kernel" ]; then
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# look for the symbol
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if which "${opt_arch_prefix}nm" >/dev/null 2>&1; then
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# the proper way: use nm and look for the symbol
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if "${opt_arch_prefix}nm" "$kernel" 2>/dev/null | grep -qw 'noretpoline_setup'; then
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retpoline_compiler=1
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pstatus green YES "noretpoline_setup found in kernel symbols"
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else
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if [ "$retpoline" = 1 ]; then
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pstatus yellow UNKNOWN
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if [ "$retpoline" = 1 ]; then
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# Now check if the compiler used to compile the kernel knows how to insert retpolines in generated asm
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# For gcc, this is -mindirect-branch=thunk-extern (detected by the kernel makefiles)
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# See gcc commit https://github.com/hjl-tools/gcc/commit/23b517d4a67c02d3ef80b6109218f2aadad7bd79
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# In latest retpoline LKML patches, the noretpoline_setup symbol exists only if CONFIG_RETPOLINE is set
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# *AND* if the compiler is retpoline-compliant, so look for that symbol
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#
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# if there is "retpoline" in the file and NOT "minimal", then it's full retpoline
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# (works for vanilla and Red Hat variants)
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if [ "$opt_live" = 1 ] && [ -e "/sys/devices/system/cpu/vulnerabilities/spectre_v2" ]; then
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if grep -qwi retpoline /sys/devices/system/cpu/vulnerabilities/spectre_v2; then
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if grep -qwi minimal /sys/devices/system/cpu/vulnerabilities/spectre_v2; then
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retpoline_compiler=0
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retpoline_compiler_reason="kernel reports minimal retpoline compilation"
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else
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pstatus yellow NO
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retpoline_compiler=1
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retpoline_compiler_reason="kernel reports full retpoline compilation"
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fi
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fi
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elif grep -q noretpoline_setup "$kernel"; then
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# if we don't have nm, nevermind, the symbol name is long enough to not have
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# any false positive using good old grep directly on the binary
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retpoline_compiler=1
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pstatus green YES "noretpoline_setup found in kernel"
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else
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if [ "$retpoline" = 1 ]; then
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pstatus yellow UNKNOWN
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else
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pstatus yellow NO
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elif [ -n "$opt_map" ]; then
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# look for the symbol
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if grep -qw noretpoline_setup "$opt_map"; then
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retpoline_compiler=1
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retpoline_compiler_reason="noretpoline_setup symbol found in System.map"
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fi
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elif [ -n "$kernel" ]; then
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# look for the symbol
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if which "${opt_arch_prefix}nm" >/dev/null 2>&1; then
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# the proper way: use nm and look for the symbol
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if "${opt_arch_prefix}nm" "$kernel" 2>/dev/null | grep -qw 'noretpoline_setup'; then
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retpoline_compiler=1
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retpoline_compiler_reason="noretpoline_setup found in kernel symbols"
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fi
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elif grep -q noretpoline_setup "$kernel"; then
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# if we don't have nm, nevermind, the symbol name is long enough to not have
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# any false positive using good old grep directly on the binary
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retpoline_compiler=1
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retpoline_compiler_reason="noretpoline_setup found in kernel"
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fi
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fi
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else
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if [ "$retpoline" = 1 ]; then
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pstatus yellow UNKNOWN "couldn't find your kernel image or System.map"
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else
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pstatus yellow NO
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if [ -n "$retpoline_compiler" ]; then
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_info_nol " * Kernel compiled with a retpoline-aware compiler: "
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if [ "$retpoline_compiler" = 1 ]; then
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if [ -n "$retpoline_compiler_reason" ]; then
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pstatus green YES "$retpoline_compiler_reason"
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else
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pstatus green YES
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fi
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else
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if [ -n "$retpoline_compiler_reason" ]; then
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pstatus red NO "$retpoline_compiler_reason"
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else
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pstatus red NO
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fi
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fi
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fi
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fi
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@ -2287,7 +2275,6 @@ check_variant2_linux()
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pstatus green YES
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else
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pstatus yellow NO
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_verbose " - To enable, \`echo 1 > $specex_knob_dir/retp_enabled' as root."
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fi
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fi
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fi
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@ -2408,7 +2395,7 @@ check_variant2_linux()
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if is_amd || ( is_intel && ! is_skylake_cpu ); then
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if [ "$retpoline" = 0 ]; then
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explain "Your kernel is not compiled with retpoline support, so you need to either upgrade your kernel (if you're using a distro) or recompile your kernel with the CONFIG_RETPOLINE option enabled. You also need to compile your kernel with a retpoline-aware compiler (re-run this script with -v to know if your version of gcc is retpoline-aware)."
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elif [ "$retpoline" = 1 ] && [ "$retpoline_compiler" != 1 ]; then
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elif [ "$retpoline" = 1 ] && [ "$retpoline_compiler" = 0 ]; then
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explain "Your kernel is compiled with retpoline, but without a retpoline-aware compiler (re-run this script with -v to know if your version of gcc is retpoline-aware)."
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elif [ "$retpoline" = 1 ] && [ "$retpoline_compiler" = 1 ] && [ "$retp_enabled" = 0 ]; then
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explain "Your kernel has retpoline support and has been compiled with a retpoline-aware compiler, but retpoline is disabled. You should enable it with \`echo 1 > $specex_knob_dir/retp_enabled\`."
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