Does Linux process exist information leakage?

[Fredrick]

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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