Some precisions to make myself more clear... -fstack-protector
Emit extra code to check for buffer overflows, such as stack smashing attacks. This is done by adding a guard variable to functions with vulnerable objects. This includes functions that call alloca, and functions with buffers larger than 8 bytes. The guards are initialized when a function is entered and then checked when the function exits. If a guard check fails, an error message is printed and the program exits. On Ubuntu the default is -fstack-protector, to turn it off use -fno-stack-protector. The last sentence might be replaced by: On Debian the default is -fnostack-protector, to turn it on use -fstack-protector which is the default on Ubuntu. Cheers, -- .''`. Aurélien GÉRÔME : :' : `. `'` Free Software Developer `- Unix Sys & Net Admin
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