This is a note to let you know that I've just added the patch titled
arm64: mte: Ensure the cleared tags are visible before setting the PTE
to the 5.17-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:
arm64-mte-ensure-the-cleared-tags-are-visible-before-setting-the-pte.patch
and it can be found in the queue-5.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1d0cb4c8864addc362bae98e8ffa5500c87e1227 Mon Sep 17 00:00:00 2001
From: Catalin Marinas <catalin.marinas@xxxxxxx>
Date: Tue, 17 May 2022 10:35:32 +0100
Subject: arm64: mte: Ensure the cleared tags are visible before setting the PTE
From: Catalin Marinas <catalin.marinas@xxxxxxx>
commit 1d0cb4c8864addc362bae98e8ffa5500c87e1227 upstream.
As an optimisation, only pages mapped with PROT_MTE in user space have
the MTE tags zeroed. This is done lazily at the set_pte_at() time via
mte_sync_tags(). However, this function is missing a barrier and another
CPU may see the PTE updated before the zeroed tags are visible. Add an
smp_wmb() barrier if the mapping is Normal Tagged.
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Fixes: 34bfeea4a9e9 ("arm64: mte: Clear the tags when a page is mapped in user-space with PROT_MTE")
Cc: <stable@xxxxxxxxxxxxxxx> # 5.10.x
Reported-by: Vladimir Murzin <vladimir.murzin@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Reviewed-by: Steven Price <steven.price@xxxxxxx>
Tested-by: Vladimir Murzin <vladimir.murzin@xxxxxxx>
Link: https://lore.kernel.org/r/20220517093532.127095-1-catalin.marinas@xxxxxxx
Signed-off-by: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/mte.c | 3 +++
1 file changed, 3 insertions(+)
--- a/arch/arm64/kernel/mte.c
+++ b/arch/arm64/kernel/mte.c
@@ -76,6 +76,9 @@ void mte_sync_tags(pte_t old_pte, pte_t
mte_sync_page_tags(page, old_pte, check_swap,
pte_is_tagged);
}
+
+ /* ensure the tags are visible before the PTE is set */
+ smp_wmb();
}
int memcmp_pages(struct page *page1, struct page *page2)
Patches currently in stable-queue which might be from catalin.marinas@xxxxxxx are
queue-5.17/arm64-mte-ensure-the-cleared-tags-are-visible-before-setting-the-pte.patch
