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!
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