On Tue Mar 29 12:48:21 EDT 2011, fors...@terzarima.net wrote: > in fact, even 64k might be too big a value for the given buf if it's near the > top of memory (eg, a local variable on a stack that's in high memory); > the PowerPC reference in the original comment is misleading because that > was just a particular system where the general problem appeared.
if that's the case, isn't this already a bug. the stack doesn't go past the end of memory, so how could sprint(buf, "x") not overwrite junk past the end of the stack anyway? also, since this is the kernel, you either get a 4k or a 4k - sizeof(Mach) structure (depending on if up is set or not), so the maximum sprint to something on the stack is always going to be < 4k. - erik
