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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-06-03 10:41:41 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-06-16 16:09:08 +0200 |
| commit | 86f46f3432727933be82f64b739712a6edb9d704 (patch) | |
| tree | 4797bb3b570922ef556c49f012a72d1aaff8c033 /arch/powerpc/mm | |
| parent | powerpc/32s: Simplify calculation of segment register content (diff) | |
| download | linux-86f46f3432727933be82f64b739712a6edb9d704.tar.xz linux-86f46f3432727933be82f64b739712a6edb9d704.zip | |
powerpc/32s: Initialise KUAP and KUEP in C
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
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/book3s32/kuap.c | 6 | ||||
| -rw-r--r-- | arch/powerpc/mm/book3s32/kuep.c | 6 |
2 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/mm/book3s32/kuap.c b/arch/powerpc/mm/book3s32/kuap.c index 1df55392878e..5533ed92ab3d 100644 --- a/arch/powerpc/mm/book3s32/kuap.c +++ b/arch/powerpc/mm/book3s32/kuap.c @@ -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) diff --git a/arch/powerpc/mm/book3s32/kuep.c b/arch/powerpc/mm/book3s32/kuep.c index 919595f47e25..3147e2edcf63 100644 --- a/arch/powerpc/mm/book3s32/kuep.c +++ b/arch/powerpc/mm/book3s32/kuep.c @@ -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) |