On Sun, Feb 24, 2013 at 11:23 PM, <Valdis.Kletnieks@vt.edu> wrote:
On Sun, 24 Feb 2013 21:37:48 -0800, Abu Rasheda said:
tmp_long_ptr = ((long_ptr & 0x800000000000) ? (long_ptr | 0xffff800000000000) : (long_ptr & 0xFFFFFFFFFFFF));
This will not do what you think it does when compiled for a 32-bit system.
This code will never run on 32 bit system, but on 64 bit Intel. So does this cover all possible valid addresses where kernel data structure can reside ? here is the expression again: 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"); }