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Re: [Gnu-arch-users] Re: give us a hand with arch
From: |
Momchil Velikov |
Subject: |
Re: [Gnu-arch-users] Re: give us a hand with arch |
Date: |
03 Oct 2003 11:58:33 +0300 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.3.50 |
>>>>> "Ollivier" == Ollivier Robert <address@hidden> writes:
Ollivier> According to Florian Weimer:
>> present in the page cache. You won't see it normally, because you
>> cannot read() beyond the end of the file, but mmap() can only map
>> complete pages, so you suddenly see the data (and it was random data
>> from kernel or user space, typically not something which ever was on
>> disk).
Ollivier> Am I the only one that sees that as a potential security problem?
Nope, you aren't. POSIX requires the system to fill with zeroes the
partial page at the end of the mapping.
~velco