Hi to all,
there is a way to poison bytes as read-only in the ASAN runtime?
For instance, I have a type field in a dynamic allocated structure that is
assigned only at creation
and I want to mark it as read-only after the first assignment to detect
type-confusions.
I found nothing searching about it in compiler-rt and so this is more a
feature request, but maybe I missed it and already exists.
Something like the following snippet would be useful:
enum {
IS_INT,
IS_FLOAT
};
struct foo {
int type;
union { int i; float f };
};
struct foo* create_int_foo(int i) {
struct foo * f = malloc(sizeof(struct foo));
f->i = i;
f->type = IS_INT;
ASAN_POISON_RDONLY_MEMORY_REGION(&f->type, sizeof(int));
}
Thank you!
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