2 May
2019
2 May
'19
4:29 p.m.
On Thu, May 02, 2019 at 06:21:33PM +0200, Peter Zijlstra wrote:
Much thanks to Joerg Roedel for talking entry_32.S with me.
TL;DR, on x86_32 kernel->kernel IRET frames are only 3 entries and do not include ESP/SS, so not only wasn't regs->sp setup, if you changed it it wouldn't be effective and corrupt random stack state.
Also, i386 is bloody insane...