imagereclaim() sabotaged itself by breaking the invariant
that cached pages are kept at the end of the page list.
once we made a hole of uncached pages, we would stop
reclaiming cached pages before it as the loop breaks
once it hits a uncached page. (we iterate backwards from
the tail to the head of the pagelist until pages have been
reclaimed or we hit a uncached page).
the solution is to move pages to the head of the pagelist
after removing them from the image cache.
child processes handling the connection should be all
independent of each another and not share rendezvous
group. the rendezvous group sharing caused a bug in
exportfs when we switched from using pid to memory
address as rendezvous tag.
exportfs used pid of slave proc as rendezvous tag. when we
changed it to use Proc* memory address, there where tag
collisions because listen didnt fork the rendezvous group (bug!).
for now, just do rfork(RFREND) in main just in case.
will fix aux/listen in a follow up changeset.
--
cinap
from /n/sources/patch/blowfish/readme:
Blowfish is broken. The order of the bytes in the ciphertext
is wrong. The problem is the conversion from the ciphertext
plaintext block to the array of u32int used by the core funcions
and vice versa.
This code has been tested on big endian and little endian
machines.
A test program is also included, bftets.c. It uses the
test vectors of blowfish available at
https://www.schneier.com/code/vectors.txt
amd64 passes first argument in RARG (BP) register
which has the be preserved duing _profin() and
_profout() calls. to handle this we introduce
_saveret() and _savearg(). _saveret() returns
AX, _savearg() returns RARG (BP). for archs other
and amd64, _saveret() and _savearg() are the
same function, doing nothing.
restoing works with dummy function:
uintptr
_restore(uintptr, uintptr ret)
{
return ret;
}
...
ret = _saveret();
arg = _savearg();
...
return _restore(arg, ret);
as we pass arg as the first argument, RARG (BP) is
restored.
we did the utf-8 to unicode conversion in pl_nextc(),
but the plaintext handler uses pl_readc() which only
translates newlines but otherwise returns bytes.
move unicode conversion in pl_readc() fixes it.
modifying the kernel pdp (CPU0PDP) hangs vmware. so
we initialize the pdp with KZERO and KZERO+1GB map
in l.s and never change it. (except when removing
the zero double map which seems to work).
VMAP has its own pdp now allowing to map 512GB of
physical address space. this simplifies the code
a bit and gives nice virtual addresses.
