7 May
2019
7 May
'19
3:28 a.m.
On Mon, May 6, 2019 at 8:22 PM Steven Rostedt rostedt@goodmis.org wrote:
But still, we need to emulate the call, which requires pushing the return code back onto the stack. I believe that part is the part we are struggling with.
Yes. But I was looking at the ftrace parts because I didn't see the bug in the low-level x86 side, so...
The x86 int3 faulting code itself looks so *trivially* simple, and it does work for the trivial test-case too. Which was what made me go "Hmm, maybe there's timing or something".
But it could obviously also be that the trivial test-case is just too trivial, and doesn't involve nmi etc etc.
Linus