Re: [PATCH v5 09/17] arm64: pgtable: move pagetable_dtor() to __tlb_remove_table()
From: Will Deacon <will@kernel.org>
Date: 2025-01-13 16:29:42
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linux-arch, linux-arm-kernel, linux-m68k, linux-mips, linux-mm, linux-riscv, linux-s390, linux-sh, linux-um, lkml, loongarch, sparclinux
On Wed, Jan 08, 2025 at 02:57:25PM +0800, Qi Zheng wrote:
Move pagetable_dtor() to __tlb_remove_table(), so that ptlock and page table pages can be freed together (regardless of whether RCU is used). This prevents the use-after-free problem where the ptlock is freed immediately but the page table pages is freed later via RCU. Page tables shouldn't have swap cache, so use pagetable_free() instead of free_page_and_swap_cache() to free page table pages. Signed-off-by: Qi Zheng <redacted> Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Kevin Brodsky <redacted> Cc: linux-arm-kernel@lists.infradead.org --- arch/arm64/include/asm/tlb.h | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-)
Acked-by: Will Deacon <will@kernel.org> Will