6.6-stable review patch. If anyone has any objections, please let me know.
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From: Christophe Leroy christophe.leroy@csgroup.eu
[ 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@csgroup.eu Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://msgid.link/dac7a828d8497c4548c91840575a706657baa4f1.1724173828.git.c... Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/mm/nohash/8xx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/mm/nohash/8xx.c b/arch/powerpc/mm/nohash/8xx.c index 3245016302787..a947dff35d651 100644 --- a/arch/powerpc/mm/nohash/8xx.c +++ b/arch/powerpc/mm/nohash/8xx.c @@ -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); }