diff options
Diffstat (limited to 'gcc-4.9/gcc/testsuite/c-c++-common/asan/swapcontext-test-1.c')
-rw-r--r-- | gcc-4.9/gcc/testsuite/c-c++-common/asan/swapcontext-test-1.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/c-c++-common/asan/swapcontext-test-1.c b/gcc-4.9/gcc/testsuite/c-c++-common/asan/swapcontext-test-1.c new file mode 100644 index 000000000..23d3db065 --- /dev/null +++ b/gcc-4.9/gcc/testsuite/c-c++-common/asan/swapcontext-test-1.c @@ -0,0 +1,63 @@ +/* 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); + printf("Test1 passed\n"); + ret += Run(zero, 1); + printf("Test2 passed\n"); + return ret; +} + +/* { dg-output "WARNING: ASan doesn't fully support makecontext/swapcontext.*" } */ +/* { dg-output "Test1 passed.*" } */ +/* { dg-output "Test2 passed.*" } */ |