linux - symbols in kernel module -

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i built linux kernel module ssp support mips architecture. added -fstack-protector-all compilation flags. after loading module i've got undefined references __stack_chk_guard , __stack_chk_fail. added libssp.so linker. looks should export symbols in kernel this:

export_symbol(__stack_chk_guard);

because kernel old , didn't contain them yet. unfortunately should use version.

my question is: why user space can use symbols toolchain library, kernel space don't ?

i think, missed linux kernel essentials.

you can't link kernel shared libraries. if have static library of libssp, may work - require library isn't calling else cause problems in kernel.

in general, stack-checking isn't should doing on kernel - i'm pretty sure serves no particularly purpose [i'm pretty sure kernel uses "guard page" each kernel stack].


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