14 May
2017
14 May
'17
11:52 a.m.
On Sat, May 13, 2017, at 19:34, Dave Horsfall wrote:
OK, I'll kick it off.
A beauty in V6 (and possibly V7) was discovered by the kiddies in Elec
Eng; by sending a signal with an appropriately-crafted negative value (as
determined from inspecting <user.h>) you could overwrite u.u_uid with
zero... Needless to say I scrambled to fix that one on my 11/40 network!
V7 fixes it by changing the if(sig >= NSIG) in psignal to cast it to
unsigned. Kill still doesn't validate its parameter until SysIII and
4BSD. PWB1 does not have the fix.