Re: [PATCH] Improve corefile generation by using /proc/PID/coredump_filter (PR corefile/16902)

Pedro Alves
2015-03-12T16:19:04Z

On 03/12/2015 03:57 PM, Jan Kratochvil wrote:
> On Thu, 12 Mar 2015 16:45:15 +0100, Pedro Alves wrote:
>> On 03/12/2015 03:00 PM, Oleg Nesterov wrote:
>>
>>> However. If (for any reason) you decide to dump this region, gdb can
>>> look into /proc/self/maps, find its own "vvar" mapping, and simply read
>>> this memory. Unlike "vdso", "vvar" has the same content for every process.
>>
>> Actually it can't: GDB may well be dumping the memory of
>> a process running on another machine (through gdbserver).
>
> So it can - from gdbserver's [vvar].

Sure, but GDB is just remotely reading the /proc files.
We'd need a new RSP packet to get at that object. All
for working around something that sounds like the kernel
should be supporting without hacks.

Thanks,
Pedro Alves