This is a note to let you know that I've just added the patch titled
powerpc/8xx: Fix initial memory mapping
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-8xx-fix-initial-memory-mapping.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7c7db984df500187d6f1e0c639826016081841ad
Author: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Date: Tue Aug 20 19:23:45 2024 +0200
powerpc/8xx: Fix initial memory mapping
[ Upstream commit f9f2bff64c2f0dbee57be3d8c2741357ad3d05e6 ]
Commit cf209951fa7f ("powerpc/8xx: Map linear memory with huge pages")
introduced an initial mapping of kernel TEXT using PAGE_KERNEL_TEXT,
but the pages that contain kernel TEXT may also contain kernel RODATA,
and depending on selected debug options PAGE_KERNEL_TEXT may be either
RWX or ROX. RODATA must be writable during init because it also
contains ro_after_init data.
So use PAGE_KERNEL_X instead to be sure it is RWX.
Fixes: cf209951fa7f ("powerpc/8xx: Map linear memory with huge pages")
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://msgid.link/dac7a828d8497c4548c91840575a706657baa4f1.1724173828.git.christophe.leroy@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/powerpc/mm/nohash/8xx.c b/arch/powerpc/mm/nohash/8xx.c
index dbbfe897455dc..52f24fda2d5f6 100644
--- a/arch/powerpc/mm/nohash/8xx.c
+++ b/arch/powerpc/mm/nohash/8xx.c
@@ -147,11 +147,11 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
mmu_mapin_immr();
- mmu_mapin_ram_chunk(0, boundary, PAGE_KERNEL_TEXT, true);
+ mmu_mapin_ram_chunk(0, boundary, PAGE_KERNEL_X, true);
if (debug_pagealloc_enabled_or_kfence()) {
top = boundary;
} else {
- mmu_mapin_ram_chunk(boundary, einittext8, PAGE_KERNEL_TEXT, true);
+ mmu_mapin_ram_chunk(boundary, einittext8, PAGE_KERNEL_X, true);
mmu_mapin_ram_chunk(einittext8, top, PAGE_KERNEL, true);
}
