Linux binfmt_script Disclosure

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Linux kernel binfmt_script handling in combination with CONFIG_MODULES can lead to disclosure of kernel stack data during execve via copy of data from dangling pointer to stack to growing argv list. Apart from that, the BINPRM_MAX_RECURSION can be exceeded: the maximum of 4 recursions is ignored, instead a maximum of roughly 2^6 recursions is in place. Proof of concept included.

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