Matthew Dillon said:
:Matt,
:
:Does datasize limit the number of backed pages, or the amount of address
:space used by a process? I.e., can I grow myself a large chunk of address
:space using mmap to the same region of a file, and then read into that
:large chunk (presumably larger than the
On Mon, 1 Feb 1999, Matthew Dillon wrote:
:So, never do stupid things as root; that's always my moto. Well, so I did
:something stupid as root, but it wasn't inherrently *that* stupid, at
:least not stupid enough to require a hard boot :). Below is the source
:...
:Except I decided to test
On Mon, 1 Feb 1999, Matthew Dillon wrote:
:So this probably works for non-root users on files like /dev/zero that can
:produce as much data as you might be interested in, suggesting a fun
:denial of service attack for the bored and/or insane.
Presumably the datasize limit can be used
:Matt,
:
:Does datasize limit the number of backed pages, or the amount of address
:space used by a process? I.e., can I grow myself a large chunk of address
:space using mmap to the same region of a file, and then read into that
:large chunk (presumably larger than the cache size if I want to be
So, never do stupid things as root; that's always my moto. Well, so I did
something stupid as root, but it wasn't inherrently *that* stupid, at
least not stupid enough to require a hard boot :). Below is the source
code for the beginnings of an audit daemon--all it does is disable
auditing on
:So, never do stupid things as root; that's always my moto. Well, so I did
:something stupid as root, but it wasn't inherrently *that* stupid, at
:least not stupid enough to require a hard boot :). Below is the source
:...
:Except I decided to test that feature that overrides the device filename
On Mon, 1 Feb 1999, Matthew Dillon wrote:
Uh. Mm.. Hmm :-)
i = read(fd, size, sizeof(size));
... malloc(bufsize * sizeof(char))
i = read(fd, buf, bufsize);
When you are reading /dev/mem, 'size' can turn out to be anything.
You are then
:
:So this probably works for non-root users on files like /dev/zero that can
:produce as much data as you might be interested in, suggesting a fun
:denial of service attack for the bored and/or insane.
:
: Robert N Watson
:
:Carnegie Mellon Universityhttp://www.cmu.edu/
:TIS Labs at
On Mon, 1 Feb 1999, Robert Watson wrote:
On Mon, 1 Feb 1999, Matthew Dillon wrote:
Uh. Mm.. Hmm :-)
i = read(fd, size, sizeof(size));
... malloc(bufsize * sizeof(char))
i = read(fd, buf, bufsize);
When you are reading /dev/mem, 'size' can
