Messages in this thread | | | Date | Tue, 9 Mar 2021 10:14:52 +0800 | From | Aili Yao <> | Subject | Re: [PATCH v3] x86/fault: Send a SIGBUS to user process always for hwpoison page access. |
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On Mon, 8 Mar 2021 18:31:07 +0000 "Luck, Tony" <tony.luck@intel.com> wrote:
> > Can you point me at that SIGBUS code in a current kernel? > > It is in kill_me_maybe(). mce_vaddr is setup when we disassemble whatever get_user() > or copy from user variant was in use in the kernel when the poison memory was consumed. > > if (p->mce_vaddr != (void __user *)-1l) { > force_sig_mceerr(BUS_MCEERR_AR, p->mce_vaddr, PAGE_SHIFT); > > Would it be any better if we used the BUS_MCEERR_AO code that goes into siginfo? > > That would make it match up better with what happens when poison is found > asynchronously by the patrol scrubber. I.e. the semantics are: > > AR: You just touched poison at this address and need to do something about that. > AO: Just letting you know that you have some poison at the address in siginfo. > > -Tony
Is the kill action for this scenario in memory_failure()?
-- Thanks! Aili Yao
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