Messages in this thread Patch in this message | | | From | Christophe Leroy <> | Subject | [PATCH v2] powerpc/8xx: Fix STRICT_KERNEL_RWX startup test failure | Date | Mon, 20 Apr 2020 05:37:42 +0000 (UTC) |
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WRITE_RO lkdtm test works.
But when selecting CONFIG_DEBUG_RODATA_TEST, the kernel reports rodata_test: test data was not read only
This is because when rodata test runs, there are still old entries in TLB.
Flush TLB after setting kernel pages RO or NX.
Fixes: d5f17ee96447 ("powerpc/8xx: don't disable large TLBs with CONFIG_STRICT_KERNEL_RWX") Cc: stable@vger.kernel.org Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> --- arch/powerpc/mm/nohash/8xx.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/mm/nohash/8xx.c b/arch/powerpc/mm/nohash/8xx.c index 3189308dece4..d83a12c5bc7f 100644 --- a/arch/powerpc/mm/nohash/8xx.c +++ b/arch/powerpc/mm/nohash/8xx.c @@ -185,6 +185,7 @@ void mmu_mark_initmem_nx(void) mmu_mapin_ram_chunk(etext8, einittext8, PAGE_KERNEL); } } + _tlbil_all(); } #ifdef CONFIG_STRICT_KERNEL_RWX @@ -199,6 +200,8 @@ void mmu_mark_rodata_ro(void) ~(LARGE_PAGE_SIZE_8M - 1))); mmu_patch_addis(&patch__dtlbmiss_romem_top, -__pa(_sinittext)); + _tlbil_all(); + /* Update page tables for PTDUMP and BDI */ mmu_mapin_ram_chunk(0, sinittext, __pgprot(0)); mmu_mapin_ram_chunk(0, etext, PAGE_KERNEL_ROX); -- 2.25.0
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