Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: [x86/uaccess] 9c5743dff4: WARNING:at_arch/x86/mm/extable.c:#ex_handler_fprestore | Date | Sun, 15 May 2022 16:54:47 +0200 |
| |
On Sun, May 15 2022 at 10:25, Thomas Gleixner wrote: > On Fri, May 13 2022 at 09:52, Linus Torvalds wrote: > The code which copies the ptrace supplied state has a pile of sanity > checks to catch invalid state, but I wouldn't bet my hat on it that it's > 100% complete. We can be more defensive here, but I would be surprised. > > Something like the untested below. I'll expose it to some testing to see > what explodes.
I was not able to get something broken past the existing sanity checks which was caught by the trial restore. I seems the FPU units are pretty resilent against random nonsense except for the XSTATE header and the MXCRS content. Though I ponder to just add that trial restore due to paranoia.
Thanks,
tglx
| |