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powerpc/32s: Initialise KUAP and KUEP in C

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In order to selectively activate KUAP and KUEP in a following patch,
perform KUAP and KUEP initialisation in C.

Unlike PPC64, PPC32 doesn't have an early_setup_secondary(),
so do it in start_secondary().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/87be72023448dd4e476744ed279b8c04b8d08a1c.1622708530.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-06-03 08:41:41 +00:00 committed by Michael Ellerman
parent 882136fb2f
commit 86f46f3432
4 changed files with 16 additions and 6 deletions
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6
arch/powerpc/kernel/head_book3s_32.S
View file

@ -934,12 +934,6 @@ _GLOBAL(load_segment_registers)
li r0, NUM_USER_SEGMENTS /* load up user segment register values */
mtctr r0 /* for context 0 */
li r3, 0 /* Kp = 0, Ks = 0, VSID = 0 */
#ifdef CONFIG_PPC_KUEP
oris r3, r3, SR_NX@h /* Set Nx */
#endif
#ifdef CONFIG_PPC_KUAP
oris r3, r3, SR_KS@h /* Set Ks */
#endif
li r4, 0
3: mtsrin r3, r4
addi r3, r3, 0x111 /* increment VSID */

4
arch/powerpc/kernel/smp.c
View file

@ -1541,6 +1541,10 @@ void start_secondary(void *unused)
{
unsigned int cpu = raw_smp_processor_id();
/* PPC64 calls setup_kup() in early_setup_secondary() */
if (IS_ENABLED(CONFIG_PPC32))
setup_kup();
mmgrab(&init_mm);
current->active_mm = &init_mm;

6
arch/powerpc/mm/book3s32/kuap.c
View file

@ -1,9 +1,15 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <asm/kup.h>
#include <asm/smp.h>
void __init setup_kuap(bool disabled)
{
kuap_update_sr(mfsr(0) | SR_KS, 0, TASK_SIZE);
if (smp_processor_id() != boot_cpuid)
return;
pr_info("Activating Kernel Userspace Access Protection\n");
if (disabled)

6
arch/powerpc/mm/book3s32/kuep.c
View file

@ -1,9 +1,15 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <asm/kup.h>
#include <asm/smp.h>
void __init setup_kuep(bool disabled)
{
kuep_lock();
if (smp_processor_id() != boot_cpuid)
return;
pr_info("Activating Kernel Userspace Execution Prevention\n");
if (disabled)