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Added a workaround for an Ubuntu bug which causes -fstack-protector-all to be disregarded.

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This commit is contained in:
cjdelisle 2011-10-16 20:38:23 -04:00
parent b68a8a6b34
commit 1e5f939381
1 changed files with 6 additions and 1 deletions
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7
src/makefile.unix
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@ -51,12 +51,17 @@ LIBS+= \
# Hardening
# Make some classes of vulnerabilities unexploitable in case one is discovered.
#
# This is a workaround for Ubuntu bug #691722, the default -fstack-protector causes
# -fstack-protector-all to be ignored unless -fno-stack-protector is used first.
# see: https://bugs.launchpad.net/ubuntu/+source/gcc-4.5/+bug/691722
HARDENING=-fno-stack-protector
# Stack Canaries
# Put numbers at the beginning of each stack frame and check that they are the same.
# If a stack buffer if overflowed, it writes over the canary number and then on return
# when that number is checked, it won't be the same and the program will exit with
# a "Stack smashing detected" error instead of being exploited.
HARDENING=-fstack-protector-all -Wstack-protector
HARDENING+=-fstack-protector-all -Wstack-protector
# Make some important things such as the global offset table read only as soon as
# the dynamic linker is finished building it. This will prevent overwriting of addresses