Merge pull request #586 from cjdelisle/hardening-bug-workaround
Added a workaround for an Ubuntu bug which causes -fstack-protector-all t
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d760b5c979
1 changed files with 6 additions and 1 deletions
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@ -51,12 +51,17 @@ LIBS+= \
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# Hardening
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# Make some classes of vulnerabilities unexploitable in case one is discovered.
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#
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# This is a workaround for Ubuntu bug #691722, the default -fstack-protector causes
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# -fstack-protector-all to be ignored unless -fno-stack-protector is used first.
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# see: https://bugs.launchpad.net/ubuntu/+source/gcc-4.5/+bug/691722
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HARDENING=-fno-stack-protector
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# Stack Canaries
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# Put numbers at the beginning of each stack frame and check that they are the same.
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# If a stack buffer if overflowed, it writes over the canary number and then on return
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# when that number is checked, it won't be the same and the program will exit with
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# a "Stack smashing detected" error instead of being exploited.
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HARDENING=-fstack-protector-all -Wstack-protector
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HARDENING+=-fstack-protector-all -Wstack-protector
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# Make some important things such as the global offset table read only as soon as
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# the dynamic linker is finished building it. This will prevent overwriting of addresses
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