January 2010
69 posts
High-speed rail gets green light |... →
bclikesyou:
Interested in this.
wired magazine had a really awesome article about this in the most recent issue:
http://www.wired.com/magazine/2010/01/ff_fasttrack/
The Downfall of the PS3
geohot: well actually it's pretty simple
geohot: i allocate a piece of memory
geohot: using map_htab and write_htab, you can figure out the real address of the memory
geohot: which is a big win, and something the hv shouldn't allow
geohot: i fill the htab with tons of entries pointing to that piece of memory
geohot: and since i allocated it, i can map it read/write
geohot: then, i deallocate the memory
geohot: all those entries are set to invalid
geohot: well while it's setting entries invalid, i glitch the memory control bus
geohot: the cache writeback misses the memory :)
geohot: and i have entries allowing r/w to a piece of memory the hypervisor thinks is deallocated
geohot: then i create a virtual segment with the htab overlapping that piece of memory i have
geohot: write an entry into the virtual segment htab allowing r/w to the main segment htab
geohot: switch to virtual segment
geohot: write to main segment htab a r/w mapping of itself
geohot: switch back
geohot: PWNED
geohot: and would work if memory were encrypted or had ECC
geohot: the way i actually glitch the memory bus is really funny
geohot: i have a button on my FPGA board
geohot: that pulses low for 40ns
geohot: i set up the htab with the tons of entries
geohot: and spam press the button
geohot: right after i send the deallocate call
a little blast from the past... →
John Travolta to Airlift Desperately Needed... →
trudymade:
WASTE!!! WHY SO MUCH WASTE!! IAM SO PISSED OFF RIGHT NOW. CAN’T HE PERSONALLY FLY HIMSELF UP HIS OWN ASS INSTEAD?
you are aware that now that we have reblogged this they will be monitoring us. and everyone thought the catholic church was bad. my father purchased a L. Ron Hubbard novel in college and still gets letters and phone calls to this day from scientologists wanting him to...
Why? →
forevertime:
totalposer:
fourstrings:
(via taylorcantspeak)
WHY Hasn’t this been reblogged 60 trillion times?… Watch.
word
