Re: Hopefully a simple question on /proc/pid/mem

["Stephen C. Tweedie" <sct@redhat.com>]

Hi,

On Mon, Apr 30, 2001 at 03:02:40PM -0400, Benjamin C.R. LaHaise wrote:
> On Mon, 30 Apr 2001, Alexander Viro wrote:
> 
> > I wonder what's wrong with reading from /proc/<pid>/mem, though - it's
> > using the same code as ptrace.
> 
> We can actually do this cleanly now that we have proper page_dirty
> semantics for raw io.  The original reason for disabling /proc/*/mem was
> that it left big gaping holes in the mm code in 2.0, and it hasn't been
> repaired since.

It was mmap of /proc/*/mem which was busted.  read/write should be OK.

Hint: think about what happens if you make a shared mapping of a
private proc/*/mem region... 

--Stephen
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