🚀 go-pugleaf

In article <Uf2Hn7G00WB4MtP4gQ@andrew.cmu.edu> Tod McQuillin <tm8t+@andrew.cmu.edu> writes:
>> What I was looking for was something along the lines of how to change the 
>> effective user id of a process who's source I may not be able to modify, by 
>> some other means, e.g. from another process.  Many suggested writing a device
>> driver or system call to do this.  Here is one answer along those lines. 

>Yeah, but you don't need a device driver to do that.  Just use
>/dev/kmem, /vmunix, and nlist(3).

True. But....

There is some risk involved in fiddling with /dev/kmem this way. It
is quite possible for the process in question to disappear between
the time you read /dev/kmem to find the proc table slot and the
time you write the new value back. This could cause massive security
problems if an unrelated process has started and was assigned this
slot.

I'd probably do this using /dev/kmem if I were to do it. But using a
driver is definitely safer.


-- 
Dave Eisen                               Sequoia Peripherals: (415) 967-5644
dkeisen@leland.Stanford.EDU              Home:                (415) 321-5154
       There's something in my library to offend everybody. 
          --- Washington Coalition Against Censorship