Messages in this thread | | | Date | Mon, 26 Sep 2022 15:15:09 +0100 | From | "Russell King (Oracle)" <> | Subject | Re: [PATCH v2] ARM: mm: Provide better fault message for permission fault |
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On Mon, Sep 26, 2022 at 09:26:50PM +0800, Kefeng Wang wrote: > > On 2022/9/26 18:13, Russell King (Oracle) wrote: > > On Mon, Sep 19, 2022 at 06:38:45PM +0800, Kefeng Wang wrote: > > > If there is a permission fault in __do_kernel_fault(), we only > > > print the generic "paging request" message which don't show > > > read, write or excute information, let's provide better fault > > > message for them. > > I don't like this change. With CPUs that do not have the ability to > > relocate the vectors to 0xffff0000, the vectors live at address 0, > > so NULL pointer dereferences can produce permission faults. > The __do_user_fault(), do_DataAbort() and do_PrefetchAbort() shows > the FSR when printing, we could do it in die_kernel_fault(), and > which will be easy for us to check whether the page fault is permision > fault,
We print the hex value already in the oops:
Internal error: Oops: (fsr hex value) [#num] ...
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