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Code Editor : cve-2018-14634.stp
#!/usr/bin/stap -g // CVE-2018-14634 // // Theory of operations: adjust the thread's # rlimit-in-effect around // calls to the vulnerable get_arg_page() function so as to encompass // the newly required _STK_LIM / 4 * 3 maximum. // Complication: the rlimit is stored in a current-> structure that // is shared across the threads of the process. They may concurrently // invoke this operation. // First attempt ... don't overthink it, just permanently reduce the // rlimit. function clamp_stack_rlim_cur:long () %{ struct rlimit *rlim = current->signal->rlim; unsigned long rlim_cur = READ_ONCE(rlim[RLIMIT_STACK].rlim_cur); unsigned long limit = _STK_LIM / 4 * 3; limit *= 4; // multiply it back up, to the scale used by rlim_cur if (rlim_cur > limit) { WRITE_ONCE(rlim[RLIMIT_STACK].rlim_cur, limit); STAP_RETURN(limit); } else STAP_RETURN(0); %} probe kernel.function("copy_strings").call { l = clamp_stack_rlim_cur() if (l) printf("lowered process %s(%d) STACK rlim_cur to %p\n", execname(), pid(), l) } probe begin { printf("CVE-2018-14634 mitigation loaded\n") } probe end { printf("CVE-2018-14634 mitigation unloaded\n") }
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