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[POWERPC] powerpc: Clear HID0 attention enable on PPC970 at boot time
authorOlof Johansson <olof@lixom.net>
Mon, 7 Aug 2006 01:51:25 +0000 (20:51 -0500)
committerPaul Mackerras <paulus@samba.org>
Thu, 17 Aug 2006 21:23:29 +0000 (07:23 +1000)
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>
arch/powerpc/kernel/cpu_setup_power4.S patch | blob | blame | history

diff --git a/arch/powerpc/kernel/cpu_setup_power4.S b/arch/powerpc/kernel/cpu_setup_power4.S
index f69af2c5d7b30faaead1c3f9473e6c8b91182674..76e97aa71c45b307347e58f031cf97ecd20dd348 100644 (file)
--- a/arch/powerpc/kernel/cpu_setup_power4.S
+++ b/arch/powerpc/kernel/cpu_setup_power4.S
@@ -76,6 +76,8 @@ _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