powerpc: Clear HID0 attention enable on PPC970 at boot time (CVE-2006-4093)

Clear HID0[en_attn] at CPU init time on PPC970.  Closes CVE-2006-4093.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

diff --git a/arch/powerpc/kernel/cpu_setup_power4.S b/arch/powerpc/kernel/cpu_setup_power4.S
index b61d86e7ceb6059c7e838927dc66c25244441f1e..55f367eddb69e3e72e390ef03aebee5c65bfcfe9 100644 (file)
--- a/arch/powerpc/kernel/cpu_setup_power4.S
+++ b/arch/powerpc/kernel/cpu_setup_power4.S
@@ -94,6 +94,8 @@ _GLOBAL(__setup_cpu_ppc970)
        mfspr   r0,SPRN_HID0
        li      r11,5                   /* clear DOZE and SLEEP */
        rldimi  r0,r11,52,8             /* set NAP and DPM */
+       li      r11,0
+       rldimi  r0,r11,32,31            /* clear EN_ATTN */
        mtspr   SPRN_HID0,r0
        mfspr   r0,SPRN_HID0
        mfspr   r0,SPRN_HID0