When you malloc a memory or mmap a MAP_ANON memory, it is virtually allocated. When you read or write to it, the process takes a page fault. The page fault handler zeroes those memory and hands it to the process. So I think there is no leak. -Fredrick On 01/11/2012 04:53 AM, 夏业添 wrote: > Hi, > My tutor asked me to test whether one process leaves information in > memory after it is dead. I tried to search some article about such thing > on the Internet but there seems to be no one discuss about it. And after > that, I tried to write some program in the User Mode to test it, using > fork() to create lots of processes and filling char 'a' into a 102400 > bytes char array in each process. Then I used malloc() to get some > memory to seek char 'a' in a new one process or many new processes, but > failed. All memory I malloced was full of zero. > As the man page of malloc said:"The memory is not initialized", I > believe that the memory which was got by malloc() could be used by other > process, and therefor information leakage exists. But how can I test it? > Or where can I get related information? > Thanks! > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
