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powerpc/8xx: Fix initial memory mapping

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[ Upstream commit f9f2bff64c ]

Commit cf209951fa ("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: cf209951fa ("powerpc/8xx: Map linear memory with huge pages")
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/dac7a828d8497c4548c91840575a706657baa4f1.1724173828.git.christophe.leroy@csgroup.eu
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Christophe Leroy 2024-08-20 19:23:45 +02:00 committed by Greg Kroah-Hartman
parent 415a2c2183
commit 6b7a006ab0
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/mm/nohash/8xx.c
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@ -149,11 +149,11 @@ 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);
}