Messages in this thread | | | Date | Tue, 21 Sep 2021 16:41:45 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH RESEND 2/2] x86/mm: Randomize va with generic arch_pick_mmap_layout() |
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On Tue, Sep 21, 2021 at 10:34:14PM +0800, sxwjean@me.com wrote: > diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h > index 7516e4199b3c..c697e377644d 100644 > --- a/arch/x86/include/asm/compat.h > +++ b/arch/x86/include/asm/compat.h > @@ -151,6 +151,11 @@ struct compat_shmid64_ds { > compat_ulong_t __unused5; > }; > > +static inline int is_compat_task(void) > +{ > + return IS_ENABLED(CONFIG_COMPAT) && test_thread_flag(TIF_32BIT); > +} > +
This is still fundamentally broken for x86. x86 doesn't have compat tasks, the granularity is at syscall at best.
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