On Sunday, February 24, 2013, Abu Rasheda wrote:
I am trying to dump some kernel data structure (walk e.g. task or file data structure on x86_64 arch). Sometime accessing through a pointer, pointer may not be NULL, but pointing to invalid address due to garbage value.
What I am looking for is range of address which are valid for kernel data structure. Is it correct to say following address are valid ?
- Bit 0 - 47 are considered - Between FFFF8000'00000000 through FFFFFFFF'FFFFFFFF
Will this cover all situations if (long_ptr > 0x1000) { tmp_long_ptr = ((long_ptr & 0x800000000000) ? (long_ptr | 0xffff800000000000) : (long_ptr & 0xFFFFFFFFFFFF)); printf("tmp_long_ptr :0x%llx\n", (long long int) tmp_long_ptr); if ((long_ptr == tmp_long_ptr) & (long_ptr >= 0x30000000)) printf("valid 64 addr\n"); }