x86/setup: Fix low identity map for >= 2GB kernel range
authorKrzysztof Mazur <krzysiek@podlesie.net>
Fri, 6 Nov 2015 13:18:36 +0000 (14:18 +0100)
committerThomas Gleixner <tglx@linutronix.de>
Sat, 7 Nov 2015 09:39:40 +0000 (10:39 +0100)
The commit f5f3497cad8c extended the low identity mapping. However, if
the kernel uses more than 2 GB (VMSPLIT_2G_OPT or VMSPLIT_1G memory
split), the normal memory mapping is overwritten by the low identity
mapping causing a crash. To avoid overwritting, limit the low identity
map to cover only memory before kernel range (PAGE_OFFSET).

Fixes: f5f3497cad8c "x86/setup: Extend low identity map to cover whole kernel range
Signed-off-by: Krzysztof Mazur <krzysiek@podlesie.net>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Matt Fleming <matt.fleming@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1446815916-22105-1-git-send-email-krzysiek@podlesie.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
arch/x86/kernel/setup.c

index a1e4da98c8f0db8c838766e9466c2608c124fe98..29db25f9a745ee11d23867cc974438817a6e5b15 100644 (file)
@@ -1188,7 +1188,7 @@ void __init setup_arch(char **cmdline_p)
         */
        clone_pgd_range(initial_page_table,
                        swapper_pg_dir     + KERNEL_PGD_BOUNDARY,
-                       KERNEL_PGD_PTRS);
+                       min(KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
 #endif
 
        tboot_probe();