This is a note to let you know that I've just added the patch titled
powerpc/64s: Fix __pte_needs_flush() false positive warning
to the 6.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-64s-fix-__pte_needs_flush-false-positive-warning.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1abce0580b89464546ae06abd5891ebec43c9470 Mon Sep 17 00:00:00 2001
From: Benjamin Gray <bgray@xxxxxxxxxxxxx>
Date: Fri, 3 Mar 2023 09:59:47 +1100
Subject: powerpc/64s: Fix __pte_needs_flush() false positive warning
From: Benjamin Gray <bgray@xxxxxxxxxxxxx>
commit 1abce0580b89464546ae06abd5891ebec43c9470 upstream.
Userspace PROT_NONE ptes set _PAGE_PRIVILEGED, triggering a false
positive debug assertion that __pte_flags_need_flush() is not called
on a kernel mapping.
Detect when it is a userspace PROT_NONE page by checking the required
bits of PAGE_NONE are set, and none of the RWX bits are set.
pte_protnone() is insufficient here because it always returns 0 when
CONFIG_NUMA_BALANCING=n.
Fixes: b11931e9adc1 ("powerpc/64s: add pte_needs_flush and huge_pmd_needs_flush")
Cc: stable@xxxxxxxxxxxxxxx # v6.1+
Reported-by: Russell Currey <ruscur@xxxxxxxxxx>
Signed-off-by: Benjamin Gray <bgray@xxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://msgid.link/20230302225947.81083-1-bgray@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/include/asm/book3s/64/tlbflush.h | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/arch/powerpc/include/asm/book3s/64/tlbflush.h
+++ b/arch/powerpc/include/asm/book3s/64/tlbflush.h
@@ -148,6 +148,11 @@ static inline void flush_tlb_fix_spuriou
*/
}
+static inline bool __pte_protnone(unsigned long pte)
+{
+ return (pte & (pgprot_val(PAGE_NONE) | _PAGE_RWX)) == pgprot_val(PAGE_NONE);
+}
+
static inline bool __pte_flags_need_flush(unsigned long oldval,
unsigned long newval)
{
@@ -164,8 +169,8 @@ static inline bool __pte_flags_need_flus
/*
* We do not expect kernel mappings or non-PTEs or not-present PTEs.
*/
- VM_WARN_ON_ONCE(oldval & _PAGE_PRIVILEGED);
- VM_WARN_ON_ONCE(newval & _PAGE_PRIVILEGED);
+ VM_WARN_ON_ONCE(!__pte_protnone(oldval) && oldval & _PAGE_PRIVILEGED);
+ VM_WARN_ON_ONCE(!__pte_protnone(newval) && newval & _PAGE_PRIVILEGED);
VM_WARN_ON_ONCE(!(oldval & _PAGE_PTE));
VM_WARN_ON_ONCE(!(newval & _PAGE_PTE));
VM_WARN_ON_ONCE(!(oldval & _PAGE_PRESENT));
Patches currently in stable-queue which might be from bgray@xxxxxxxxxxxxx are
queue-6.2/powerpc-64s-fix-__pte_needs_flush-false-positive-warning.patch
