KnVmProtect()

This function is declared in the coresrv/vmm/vmm_api.h file.

Retcode KnVmProtect(void *addr, rtl_size_t size, int newFlags);

Modifies the protection attributes of reserved or committed memory pages.

Parameters:

• addr is the page-aligned base virtual address of the memory area.
• size is the size of the memory area in bytes (must be a multiple of the page size).
• newFlags refers to new protection attributes.

If the protection attributes are successfully changed, the function returns rcOk.

Permissible combinations of memory protection attributes:

• VMM_FLAG_READ allows reading page contents.
• VMM_FLAG_READ | VMM_FLAG_WRITE allows reading and modifying page contents.
• VMM_FLAG_READ | VMM_FLAG_EXECUTE allows reading and executing page contents.
• VMM_FLAG_RWX_MASK or VMM_FLAG_READ | VMM_FLAG_WRITE | VMM_FLAG_EXECUTE refers to full access to page contents (these entries are equivalent).