Re: [PATCH] proc: prevent accessing /proc/<PID>/environ until it's ready

[Mathias Krause]

On 28 April 2016 at 21:20, Mateusz Guzik <mguzik@xxxxxxxxxx> wrote:
> In this case get_cmdline in mm/util.c should also be patched for
> completness. It tests for arg_end, but later accesses env_end.

But it'll do this only when argv[] was modified from what the kernel
initially wrote, which, in turn, either requires the process to have
started executing and messing with it's own argv[] or another process
poking at it via ptrace(). In the former case env_end will be non-zero
already and I don't know if the latter case is actually possible, i.e.
if one can already attach to a process this early. If one can, then
yes, that place needs to be modified, too.

Thanks,
Mathias