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Message-ID: <505766fa0908111853y7030399ewb07d4cec6829fd16@mail.gmail.com> Date: Wed, 12 Aug 2009 09:53:01 +0800 From: hyl <heyongli@...il.com> To: linux-kernel@...r.kernel.org Subject: Sparc miss chance to fix recoverable fault in copy_from_user if kernel code access the invalid address, ie, copy_from_user then tlb miss handler finally report error in sunv4_dtlb_errorthen halt. instead of halt, should call do_sparc64_fault to fix such fault by search extable. a dirty fix like this can work( little testing,just boot and test the copy_from_user). --- a/arch/sparc/kernel/sun4v_tlb_miss.S +++ b/arch/sparc/kernel/sun4v_tlb_miss.S @@ -124,7 +124,7 @@ sun4v_dtlb_load: mov %g3, %o2 ! PTE mov HV_MMU_DMMU, %o3 ! flags ta HV_MMU_MAP_ADDR_TRAP - brnz,pn %o0, sun4v_dtlb_error + brnz,pn %o0, sun4v_dtlb_prot mov %g2, %o1 ! restore %o1 mov %g1, %o0 ! restore %o0 mov %g5, %o2 ! restore %o2 am i miss understanding the merged sparc/spar64? this problem found on sparc64, via a simple module just access address 0 via copy_from_user. another simple test is kgdb, issue a cmd: x 0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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