Hi,
I am curious to know what the stance is from people with deep expertise
with KProbe regarding its stability for use on production systems
(meaning, what are the chances of crashing a system by inserting kernel
probes).
The main use I am looking at is intercepting a few (~8-10) system
calls, and retrieving some specific data from the task_struct mainly.
Notably :
- Is KProbe today (in the latest distribs : Ubuntu 14.04 , RHEL 7,
etc...) stable to the point it is perfectly ok to use KProbe to say
redirect system calls and perform measurements on them on a system
that's high value ? This obviously assumes that whatever code I am
inserting in the probe is safe and sound.
- Did stability evolve over recent times or has it been deemed stable
for years ? I'm trying to figure out if there's some kind of cutoff
date, where kernels released before that cutoff date should not be used
with KProbe and those after are okay. Even a very blurry timeline is
fine btw, I don't need a specific day of the year :)
I'm interested in both the insertion and removal of the probes. Are
they both safe ?
Thanks,
Hassan
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