From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: [PATCH] powerpc/powermac: Fix low_sleep_handler with KUAP and KUEP
Date: Tue, 1 Sep 2020 07:35:44 +0000 (UTC) [thread overview]
Message-ID: <74472ea2a7e8698273643cde7d382bd9f31cd1dd.1598945727.git.christophe.leroy@csgroup.eu> (raw)
low_sleep_handler() has an hardcoded restore of segment registers
that doesn't take KUAP and KUEP into account.
Use head_32's load_segment_registers() routine instead.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Fixes: a68c31fc01ef ("powerpc/32s: Implement Kernel Userspace Access Protection")
Fixes: 31ed2b13c48d ("powerpc/32s: Implement Kernel Userspace Execution Prevention.")
Cc: stable@vger.kernel.org
---
arch/powerpc/platforms/powermac/sleep.S | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
diff --git a/arch/powerpc/platforms/powermac/sleep.S b/arch/powerpc/platforms/powermac/sleep.S
index f9a680fdd9c4..51bfdfe85058 100644
--- a/arch/powerpc/platforms/powermac/sleep.S
+++ b/arch/powerpc/platforms/powermac/sleep.S
@@ -294,14 +294,7 @@ grackle_wake_up:
* we do any r1 memory access as we are not sure they
* are in a sane state above the first 256Mb region
*/
- li r0,16 /* load up segment register values */
- mtctr r0 /* for context 0 */
- lis r3,0x2000 /* Ku = 1, VSID = 0 */
- li r4,0
-3: mtsrin r3,r4
- addi r3,r3,0x111 /* increment VSID */
- addis r4,r4,0x1000 /* address of next segment */
- bdnz 3b
+ bl load_segment_registers
sync
isync
--
2.25.0
next reply other threads:[~2020-09-01 7:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-01 7:35 Christophe Leroy [this message]
2020-09-10 23:56 ` [PATCH] powerpc/powermac: Fix low_sleep_handler with KUAP and KUEP Michael Ellerman
2020-09-11 10:30 ` Christophe Leroy
2020-09-11 13:06 ` Michael Ellerman
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