Messages in this thread | | | From | "H.J. Lu" <> | Date | Thu, 26 Aug 2021 10:22:29 -0700 | Subject | Re: [PATCH v29 25/32] x86/cet/shstk: Handle thread shadow stack |
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On Thu, Aug 26, 2021 at 9:49 AM Borislav Petkov <bp@alien8.de> wrote: > > On Fri, Aug 20, 2021 at 11:11:54AM -0700, Yu-cheng Yu wrote: > > diff --git a/arch/x86/kernel/shstk.c b/arch/x86/kernel/shstk.c > > index 5993aa8db338..7c1ca2476a5e 100644 > > --- a/arch/x86/kernel/shstk.c > > +++ b/arch/x86/kernel/shstk.c > > @@ -75,6 +75,61 @@ int shstk_setup(void) > > return err; > > } > > > > +int shstk_alloc_thread_stack(struct task_struct *tsk, unsigned long clone_flags, > > + unsigned long stack_size) > > +{ > > + struct thread_shstk *shstk = &tsk->thread.shstk; > > + struct cet_user_state *state; > > + unsigned long addr; > > + > > + if (!shstk->size) > > + return 0; > > + > > + /* > > + * Earlier clone() does not pass stack_size. Use RLIMIT_STACK and > > What is "earlier clone()"?
clone() doesn't have stack size info which was added to clone3().
> > + * cap to 4 GB. > > + */ > > -- > Regards/Gruss, > Boris. > > https://people.kernel.org/tglx/notes-about-netiquette
-- H.J.
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