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 <zhengqi.arch@xxxxxxxxxxxxx> Suggested-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Reviewed-by: Kevin Brodsky <kevin.brodsky@xxxxxxx> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx --- arch/arm64/include/asm/tlb.h | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-)
Acked-by: Will Deacon <will@xxxxxxxxxx> Will
