[llvm-bugs] [Bug 33857] New: [SanitizerCoverage] implement instrumentation for lowest stack pointer value

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Jul 19 18:41:43 PDT 2017


            Bug ID: 33857
           Summary: [SanitizerCoverage] implement instrumentation for
                    lowest stack pointer value
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: mascasa at google.com
          Reporter: kcc at google.com
                CC: llvm-bugs at lists.llvm.org

r308577 adds a libFuzzer logic to use recursion depth as a signal
(inspired by
"Stack-depth-guided fuzzing")

We need to extract the recursion depth with a dedicated inlined compiler

it should be something like -fsanitize-coverage=stack-depth
that would insert this code at the beginning of every function:

uintptr_t current_stack = __builtin_frame_address(0);
if (__sanitizer_cov_lowest_stack > current_stack)
 __sanitizer_cov_lowest_stack = current_stack;

// Users should declare this in their code (e.g. in libFuzzer)
thread_local uintptr __sanitizer_cov_lowest_stack;

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