Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)

From: Avi Kivity
Date: Sun Jan 17 2010 - 09:59:58 EST

On 01/17/2010 04:52 PM, Peter Zijlstra wrote:
On Sun, 2010-01-17 at 16:39 +0200, Avi Kivity wrote:
On 01/15/2010 11:50 AM, Peter Zijlstra wrote:
As previously stated, I think poking at a process's address space is an
utter no-go.

Why not reserve an address space range for this, somewhere near the top
of memory? It doesn't have to be populated if it isn't used.
Because I think poking at a process's address space like that is gross.
Also, if its fixed size you're imposing artificial limits on the number
of possible probes.

btw, an alternative is to require the caller to provide the address space for this. If the caller is in another process, we need to allow it to play with the target's address space (i.e. mmap_process()). I don't think uprobes justifies this by itself, but mmap_process() can be very useful for sandboxing with seccomp.

error compiling committee.c: too many arguments to function

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