Mercurial > hg > CbC > CbC_gcc
view gcc/testsuite/c-c++-common/asan/swapcontext-test-1.c @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
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/* Check that ASan plays well with easy cases of makecontext/swapcontext. */ /* { dg-do run { target swapcontext } } */ #include <stdio.h> #include <ucontext.h> #include <unistd.h> ucontext_t orig_context; ucontext_t child_context; void Child(int mode) { char x[32] = {0}; /* Stack gets poisoned. */ printf("Child: %p\n", x); /* (a) Do nothing, just return to parent function. (b) Jump into the original function. Stack remains poisoned unless we do something. */ if (mode == 1) { if (swapcontext(&child_context, &orig_context) < 0) { perror("swapcontext"); _exit(0); } } } int Run(int arg, int mode) { int i; const int kStackSize = 1 << 20; char child_stack[kStackSize + 1]; printf("Child stack: %p\n", child_stack); /* Setup child context. */ getcontext(&child_context); child_context.uc_stack.ss_sp = child_stack; child_context.uc_stack.ss_size = kStackSize / 2; if (mode == 0) { child_context.uc_link = &orig_context; } makecontext(&child_context, (void (*)())Child, 1, mode); if (swapcontext(&orig_context, &child_context) < 0) { perror("swapcontext"); return 0; } /* Touch childs's stack to make sure it's unpoisoned. */ for (i = 0; i < kStackSize; i++) { child_stack[i] = i; } return child_stack[arg]; } volatile int zero = 0; int main(int argc, char **argv) { int ret = 0; ret += Run(zero, 0); fprintf(stderr, "Test1 passed\n"); ret += Run(zero, 1); fprintf(stderr, "Test2 passed\n"); return ret; } /* { dg-output "WARNING: ASan doesn't fully support makecontext/swapcontext.*" } */ /* { dg-output "Test1 passed.*" } */ /* { dg-output "Test2 passed.*" } */