On 25.05.2015 11:12, Andrey Ryabinin wrote: > On 05/22/2015 07:03 PM, Alexander Popov wrote: >> Physical addresses in KASan shadow region page tables need fixup: >> kernel halts without it if phys_base is not zero. >> > > Indeed. > Since we have to patch page tables anyway, compile-time created kasan > page tables become pointless. > So, I'd suggest to create them in runtime. This could be done in plain C > in kasan_map_early_shadow(). >
Thanks for your reply, Andrey. Creating kasan_zero_pud, kasan_zero_pmd and kasan_zero_pte in kasan_map_early_shadow() doesn't look handy for me because this function is called twice in x86_64_start_kernel(). What do you think about leaving the initialization of KASan shadow region page tables in arch/x86/kernel/head_64.S and calling something like kasan_fixup_early_shadow() before calling kasan_map_early_shadow() for the first time? Best regards, Alexander -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
