From: Nam Cao Date: Thu, 19 Jun 2025 15:58:58 +0000 (+0200) Subject: Revert "riscv: Define TASK_SIZE_MAX for __access_ok()" X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=890ba5be6335dbbbc99af14ea007befb5f83f174;p=linux-block.git Revert "riscv: Define TASK_SIZE_MAX for __access_ok()" This reverts commit ad5643cf2f69 ("riscv: Define TASK_SIZE_MAX for __access_ok()"). This commit changes TASK_SIZE_MAX to be LONG_MAX to optimize access_ok(), because the previous TASK_SIZE_MAX (default to TASK_SIZE) requires some computation. The reasoning was that all user addresses are less than LONG_MAX, and all kernel addresses are greater than LONG_MAX. Therefore access_ok() can filter kernel addresses. Addresses between TASK_SIZE and LONG_MAX are not valid user addresses, but access_ok() let them pass. That was thought to be okay, because they are not valid addresses at hardware level. Unfortunately, one case is missed: get_user_pages_fast() happily accepts addresses between TASK_SIZE and LONG_MAX. futex(), for instance, uses get_user_pages_fast(). This causes the problem reported by Robert [1]. Therefore, revert this commit. TASK_SIZE_MAX is changed to the default: TASK_SIZE. This unfortunately reduces performance, because TASK_SIZE is more expensive to compute compared to LONG_MAX. But correctness first, we can think about optimization later, if required. Reported-by: Closes: https://lore.kernel.org/linux-riscv/77605.1750245028@localhost/ Signed-off-by: Nam Cao Cc: stable@vger.kernel.org Reviewed-by: Alexandre Ghiti Fixes: ad5643cf2f69 ("riscv: Define TASK_SIZE_MAX for __access_ok()") Link: https://lore.kernel.org/r/20250619155858.1249789-1-namcao@linutronix.de Signed-off-by: Palmer Dabbelt --- diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index a11816bbf9e7..521a995741cd 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -1075,7 +1075,6 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) */ #ifdef CONFIG_64BIT #define TASK_SIZE_64 (PGDIR_SIZE * PTRS_PER_PGD / 2) -#define TASK_SIZE_MAX LONG_MAX #ifdef CONFIG_COMPAT #define TASK_SIZE_32 (_AC(0x80000000, UL) - PAGE_SIZE)