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Pass security flags and check gcc version #525

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Pass security flags and check gcc version #525

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514a929
Pass security flags and check gcc version
SaitTalhaNisanci Oct 20, 2020
1fdf59a
Use -fstack-clash-protection if gcc >= 8
SaitTalhaNisanci Oct 20, 2020
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18 changes: 17 additions & 1 deletion citus.spec
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Expand Up @@ -34,8 +34,24 @@ commands.
%prep
%setup -q -n %{sname}-%{version}

# Flags taken from: https://liquid.microsoft.com/Web/Object/Read/ms.security/Requirements/Microsoft.Security.SystemsADM.10203#guide
SECURITY_CFLAGS="-fstack-protector-strong -D_FORTIFY_SOURCE=2 -O2 -z noexecstack -fpic -Wl,-z,relro -Wl,-z,now -Wformat -Wformat-security -Werror=format-security"

currentgccver="$(gcc -dumpversion)"
requiredgccver="4.8.2"
if [ "$(printf '%s\n' "$requiredgccver" "$currentgccver" | sort -V | tail -n1)" = "$requiredgccver" ]; then
echo WARNING: Using slower security flags because of outdated compiler
SECURITY_CFLAGS="-fstack-protector-all -D_FORTIFY_SOURCE=2 -O2 -z noexecstack -fpic -Wl,-z,relro -Wl,-z,now -Wformat -Wformat-security -Werror=format-security"
fi
fi

gccgte8=$(expr `gcc -dumpversion | cut -f1 -d.` \>= 8)
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I'd prefer if this used the same type of check as the one above for consistency, i.e. using sort -V (version sort).

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Actually thinking about that a bit, we would enter that if it the version is equal to "4.8.2" but we don't want to, isn't that if check wrong in this case?

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I guess you are right, maybe a better way would be to use head -n1 and check against currentgccver

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if currentgccver and requiredgccver are the same, then what is the difference between head -n1 or tail -n1, or checking against currentgccver or requiredgccver. I would say that we can switch to gte structure here

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if ! [ "$(printf '%s\n' "$requiredgccver" "$currentgccver" | sort -V | head -n1)" = "$requiredgccver" ]; then
      echo WARNING: Using slower security flags because of outdated compiler
fi

or something like the above maybe

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@JelteF JelteF Oct 21, 2020 •
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yes that seems good, but maybe use != instead of ! [ ... = ... ]

And then use

if [ "$(printf '%s\n' "8.0.0" "$currentgccver" | sort -V | head -n1)" = "8.0.0" ]; then
      # add extra security flag
fi

ifeq "$(gccgte8)" "1"
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isn't ifeq a Makefile thing? I believe this spec file is (ba)sh.

SECURITY_CFLAGS += -fstack-clash-protection
endif

%build
%configure PG_CONFIG=%{pginstdir}/bin/pg_config --with-extra-version="%{?conf_extra_version}"
%configure PG_CONFIG=%{pginstdir}/bin/pg_config --with-extra-version="%{?conf_extra_version}" CC=$(command -v gcc) CFLAGS="$SECURITY_CFLAGS"
make %{?_smp_mflags}

%install
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9 changes: 9 additions & 0 deletions debian/check-gcc-version.sh
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@@ -0,0 +1,9 @@
#!/bin/bash
set -euxo pipefail

currentgccver="$($(pg_config --cc) -dumpversion)"
requiredgccver="4.8.2"
if [ "$(printf '%s\n' "$requiredgccver" "$currentgccver" | sort -V | tail -n1)" = "$requiredgccver" ]; then
echo ERROR: At least GCC version "$requiredgccver" is needed
exit 1
fi
12 changes: 11 additions & 1 deletion debian/rules
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Expand Up @@ -2,8 +2,17 @@

include /usr/share/postgresql-common/pgxs_debian_control.mk

# Flags taken from: https://liquid.microsoft.com/Web/Object/Read/ms.security/Requirements/Microsoft.Security.SystemsADM.10203#guide
SECURITY_CFLAGS=-fstack-protector-strong -D_FORTIFY_SOURCE=2 -O2 -z noexecstack -fpic -Wl,-z,relro -Wl,-z,now -Wformat -Wformat-security -Werror=format-security

GCCVERSIONGTE8=$(shell expr `gcc -dumpversion | cut -f1 -d.` \>= 8)
ifeq "$(GCCVERSIONGTE8)" "1"
# if gcc version is greater than or equal to 8 we should also use this flag
SECURITY_CFLAGS += -fstack-clash-protection
endif

override_dh_auto_build:
+pg_buildext build build-%v
+pg_buildext build build-%v '$(CFLAGS) $(SECURITY_CFLAGS)'

override_dh_auto_clean:
+pg_buildext clean build-%v
Expand All @@ -12,6 +21,7 @@ override_dh_auto_test:
# nothing to do here, see debian/tests/* instead

override_dh_auto_configure:
debian/check-gcc-version.sh
+pg_buildext configure build-%v --with-extra-version="$${CONF_EXTRA_VERSION:-}"

override_dh_auto_install:
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