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[POWERPC] powerpc: Clear HID0 attention enable on PPC970 at boot time

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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>
This commit is contained in:
Olof Johansson 2006-08-06 20:51:25 -05:00 committed by Paul Mackerras
parent e5c14ce118
commit 9a936a2e05
1 changed files with 2 additions and 0 deletions
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2
arch/powerpc/kernel/cpu_setup_power4.S
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@ -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