> These aren't the only ways.
That's probably true.
> I think it would be good to let a crash dump handler open a device file
> to get control. Before dumping core, the kernel checks for a crash dump
> handler running with the same UID. If one is found, the dying process
> sleeps and the crash dump handler is asked to respond.
That would remove process invocation from the kernel path.
You could do a lot of *this* in user space by having a library function
set the default value for all signals, or just SIGSEGV, to a function
that uses some kind of IPC, such as writing to a fifo whose name includes
the uid. I wonder if it's possible to use preloading to inject that
snippet of code into an existing executable without relinking it and
without touching libc.
Michael Elizabeth Chastain
<mailto:mec@shout.net>
"love without fear"
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