[PATCH] powerpc/vdso: Mark the vDSO code read-only after init

From: Christophe Leroy
Date: Sat Dec 14 2024 - 06:10:28 EST


VDSO text is fixed-up during init so it can't be const,
but it can be read-only after init.

Do the same as x86 in commit 018ef8dcf3de ("x86/vdso: Mark the vDSO
code read-only after init") and arm in commit 11bf9b865898 ("ARM/vdso:
Mark the vDSO code read-only after init"), move it into
ro_after_init section.

Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
---
arch/powerpc/kernel/vdso32_wrapper.S | 2 +-
arch/powerpc/kernel/vdso64_wrapper.S | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/vdso32_wrapper.S b/arch/powerpc/kernel/vdso32_wrapper.S
index 10f92f265d51..20bca3548b44 100644
--- a/arch/powerpc/kernel/vdso32_wrapper.S
+++ b/arch/powerpc/kernel/vdso32_wrapper.S
@@ -2,7 +2,7 @@
#include <linux/linkage.h>
#include <asm/page.h>

- __PAGE_ALIGNED_DATA
+ .section ".data..ro_after_init", "aw"

.globl vdso32_start, vdso32_end
.balign PAGE_SIZE
diff --git a/arch/powerpc/kernel/vdso64_wrapper.S b/arch/powerpc/kernel/vdso64_wrapper.S
index 839d1a61411d..1912936fa227 100644
--- a/arch/powerpc/kernel/vdso64_wrapper.S
+++ b/arch/powerpc/kernel/vdso64_wrapper.S
@@ -2,7 +2,7 @@
#include <linux/linkage.h>
#include <asm/page.h>

- __PAGE_ALIGNED_DATA
+ .section ".data..ro_after_init", "aw"

.globl vdso64_start, vdso64_end
.balign PAGE_SIZE
--
2.47.0