"Exec Shield" for Linux [LWN.net]

"Exec Shield" for Linux

Posted May 3, 2003 22:29 UTC (Sat) by dvdeug (subscriber, #10998)
In reply to: "Exec Shield" for Linux by JoeBuck
Parent article: "Exec Shield" for Linux

For nested functions, a GCC extension, a "trampoline" function is built that lives on the stack, so a non-executable stack patch will break this. But standard C and C++ codes should not be affected

Standard C and C++ codes shouldn't be affected, but other languages like Ada make heavy use of nested functions.

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"Exec Shield" for Linux

Posted May 5, 2003 2:29 UTC (Mon) by jamesh (subscriber, #1159) [Link]

Are you sure that Ada would be affected? The "trampoline" function that is produced by the C and C++ compilers sounds like something necessary to implement nested functions while maintaining the same ABI and calling conventions. The fact that the implementation of this C extension breaks doesn't imply that Ada will break.

Of course, the best way to be sure is to download and apply the kernel patch and see what happens. I am sure that Ingo would be interested in the results.