Aslr #48
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Aslr #48
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35 tasks
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@jamill I bet the CI failure will be resolved by rebasing onto upstream's |
jamill
commented
Nov 6, 2018
jamill
commented
Nov 6, 2018
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/cc @jeffhostetler @dscho - I left some file level comments / questions. |
This is the first step for enabling ASLR (Address Space Layout Randomization) support. We want to enable ASLR for better protection against exploiting security holes in Git. The problem fixed by this commit is that `ld.exe` seems to be stripping relocations which in turn will break ASLR support. We just make sure it's not stripping the main executable entry. Signed-off-by: İsmail Dönmez <ismail@i10z.com> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Enable DEP (Data Execution Prevention) and ASLR (Address Space Layout Randomization) support. This applies to both 32bit and 64bit builds and makes it substantially harder to exploit security holes in Git by offering a much more unpredictable attack surface. ASLR interferes with GDB's ability to set breakpoints. A similar issue holds true when compiling with -O2 (in which case single-stepping is messed up because GDB cannot map the code back to the original source code properly). Therefore we simply enable ASLR only when an optimization flag is present in the CFLAGS, using it as an indicator that the developer does not want to debug in GDB anyway. Signed-off-by: İsmail Dönmez <ismail@i10z.com> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
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Port ASLR compile flags upstream