Hi Ard, On Wed, 29 Apr 2026, at 15:57, Kevin Brodsky wrote: > On 27/04/2026 17:34, Ard Biesheuvel wrote: >> [...] >> >> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c >> index 84d81bae07a7..e76fe5b0c5fe 100644 >> --- a/arch/arm64/mm/mmu.c >> +++ b/arch/arm64/mm/mmu.c >> @@ -1076,6 +1076,11 @@ void __init mark_linear_text_alias_ro(void) >> (unsigned long)__init_begin - (unsigned long)_text, >> pgprot_tagged(PAGE_KERNEL_RO)); >> >> + /* Map the fixmap PTE table at __fixmap_pgdir_start R/O in linear map >> too */ >> + update_mapping_prot(__pa_symbol(__fixmap_pgdir_start), >> + (unsigned long)lm_alias(__fixmap_pgdir_start), >> + PAGE_SIZE, pgprot_tagged(PAGE_KERNEL_RO)); > > Is that definitely just one page? >
No it most definitely is not - thanks for spotting that :-)
