reopen 655164 thanks Dear Maintainer,
The LDFLAGS hardening flags are still missing for libbz2.so
because $(LDFLAGS) is not used in Makefile. For more hardening
information please have a look at [1], [2] and [3].
The attached patch is an updated version of bzip2-harden.patch
which fixes the issue.
To check if all flags were correctly enabled you can use
`hardening-check` from the hardening-includes package and check
the build log with `blhc` (hardening-check doesn't catch
everything):
$ hardening-check /lib/x86_64-linux-gnu/libbz2.so.1.0.4
/usr/lib32/libbz2.so.1.0.4 /bin/bzip2 ...
/lib/x86_64-linux-gnu/libbz2.so.1.0.4:
Position Independent Executable: no, regular shared library (ignored)
Stack protected: yes
Fortify Source functions: yes (some protected functions found)
Read-only relocations: yes
Immediate binding: no not found!
/usr/lib32/libbz2.so.1.0.4:
Position Independent Executable: no, regular shared library (ignored)
Stack protected: yes
Fortify Source functions: yes (some protected functions found)
Read-only relocations: yes
Immediate binding: no not found!
/bin/bzip2:
Position Independent Executable: no, normal executable!
Stack protected: yes
Fortify Source functions: yes (some protected functions found)
Read-only relocations: yes
Immediate binding: no not found!
...
(Position Independent Executable and Immediate binding is not
enabled by default.)
Use find -type f \( -executable -o -name \*.so\* \) -exec
hardening-check {} + on the build result to check all files.
Regards,
Simon
[1]: https://wiki.debian.org/ReleaseGoals/SecurityHardeningBuildFlags
[2]: https://wiki.debian.org/HardeningWalkthrough
[3]: https://wiki.debian.org/Hardening
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Index: bzip2-1.0.6/Makefile =================================================================== --- bzip2-1.0.6.orig/Makefile 2012-07-01 15:05:07.000000000 +0200 +++ bzip2-1.0.6/Makefile 2012-07-01 15:08:45.586377822 +0200 @@ -20,10 +20,10 @@ CC=gcc AR=ar RANLIB=ranlib -LDFLAGS= +LDFLAGS= `dpkg-buildflags --get LDFLAGS` BIGFILES=-D_FILE_OFFSET_BITS=64 -CFLAGS=-Wall -Winline -O2 -g $(BIGFILES) $(DEBCFLAGS) +CFLAGS=-Wall -Winline $(BIGFILES) $(DEBCFLAGS) # Where you want it installed when you do 'make install' PREFIX=/usr/local @@ -61,7 +61,7 @@ ln -sf $^ $@ libbz2.so.$(sominor): $(OBJS:%.o=%.sho) - $(CC) -o libbz2.so.$(sominor) -shared \ + $(CC) $(LDFLAGS) -o libbz2.so.$(sominor) -shared \ -Wl,-soname,libbz2.so.$(somajor) $^ -lc %.sho: %.c
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