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authorChristophe Leroy <christophe.leroy@c-s.fr>2020-04-20 05:37:42 +0000
committerMichael Ellerman <mpe@ellerman.id.au>2020-04-22 20:23:41 +1000
commitb61c38baa98056d4802ff5be5cfb979efc2d0f7a (patch)
tree65d945fe4357e8c7b2cbe23c207fc48cb66f32c3 /arch
parent94c0b013c98583614e1ad911e8795ca36da34a85 (diff)
downloadlinux-b61c38baa98056d4802ff5be5cfb979efc2d0f7a.tar.bz2
powerpc/8xx: Fix STRICT_KERNEL_RWX startup test failure
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 # v5.1+ Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/485caac75f195f18c11eb077b0031fdd2bb7fb9e.1587361039.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/mm/nohash/8xx.c3
1 files changed, 3 insertions, 0 deletions
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);