The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x f620d66af3165838bfa845dcf9f5f9b4089bf508 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2025101647-segment-boney-64c3@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f620d66af3165838bfa845dcf9f5f9b4089bf508 Mon Sep 17 00:00:00 2001 From: Catalin Marinas catalin.marinas@arm.com Date: Wed, 24 Sep 2025 13:31:22 +0100 Subject: [PATCH] arm64: mte: Do not flag the zero page as PG_mte_tagged

Commit 68d54ceeec0e ("arm64: mte: Allow PTRACE_PEEKMTETAGS access to the zero page") attempted to fix ptrace() reading of tags from the zero page by marking it as PG_mte_tagged during cpu_enable_mte(). The same commit also changed the ptrace() tag access permission check to the VM_MTE vma flag while turning the page flag test into a WARN_ON_ONCE().

Attempting to set the PG_mte_tagged flag early with CONFIG_DEFERRED_STRUCT_PAGE_INIT enabled may either hang (after commit d77e59a8fccd "arm64: mte: Lock a page for MTE tag initialisation") or have the flags cleared later during page_alloc_init_late(). In addition, pages_identical() -> memcmp_pages() will reject any comparison with the zero page as it is marked as tagged.

Partially revert the above commit to avoid setting PG_mte_tagged on the zero page. Update the __access_remote_tags() warning on untagged pages to ignore the zero page since it is known to have the tags initialised.

Note that all user mapping of the zero page are marked as pte_special(). The arm64 set_pte_at() will not call mte_sync_tags() on such pages, so PG_mte_tagged will remain cleared.

Signed-off-by: Catalin Marinas catalin.marinas@arm.com Fixes: 68d54ceeec0e ("arm64: mte: Allow PTRACE_PEEKMTETAGS access to the zero page") Reported-by: Gergely Kovacs Gergely.Kovacs2@arm.com Cc: stable@vger.kernel.org # 5.10.x Cc: Will Deacon will@kernel.org Cc: David Hildenbrand david@redhat.com Cc: Lance Yang lance.yang@linux.dev Acked-by: Lance Yang lance.yang@linux.dev Reviewed-by: David Hildenbrand david@redhat.com Tested-by: Lance Yang lance.yang@linux.dev Signed-off-by: Will Deacon will@kernel.org

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index ecb83ab0700e..7345987a50a0 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -2303,17 +2303,21 @@ static void bti_enable(const struct arm64_cpu_capabilities *__unused) #ifdef CONFIG_ARM64_MTE static void cpu_enable_mte(struct arm64_cpu_capabilities const *cap) { + static bool cleared_zero_page = false; + sysreg_clear_set(sctlr_el1, 0, SCTLR_ELx_ATA | SCTLR_EL1_ATA0);

mte_cpu_setup();

/* * Clear the tags in the zero page. This needs to be done via the - * linear map which has the Tagged attribute. + * linear map which has the Tagged attribute. Since this page is + * always mapped as pte_special(), set_pte_at() will not attempt to + * clear the tags or set PG_mte_tagged. */ - if (try_page_mte_tagging(ZERO_PAGE(0))) { + if (!cleared_zero_page) { + cleared_zero_page = true; mte_clear_page_tags(lm_alias(empty_zero_page)); - set_page_mte_tagged(ZERO_PAGE(0)); }

kasan_init_hw_tags_cpu(); diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c index e5e773844889..63aed49ac181 100644 --- a/arch/arm64/kernel/mte.c +++ b/arch/arm64/kernel/mte.c @@ -460,7 +460,7 @@ static int __access_remote_tags(struct mm_struct *mm, unsigned long addr, if (folio_test_hugetlb(folio)) WARN_ON_ONCE(!folio_test_hugetlb_mte_tagged(folio)); else - WARN_ON_ONCE(!page_mte_tagged(page)); + WARN_ON_ONCE(!page_mte_tagged(page) && !is_zero_page(page));

/* limit access to the end of the page */ offset = offset_in_page(addr);