From 3d2403fd10a1dbb359b154af41ffed9f2a7520e8 Mon Sep 17 00:00:00 2001 From: Mark Rutland Date: Wed, 2 Dec 2020 13:15:55 +0000 Subject: arm64: uaccess: remove set_fs() Now that the uaccess primitives dont take addr_limit into account, we have no need to manipulate this via set_fs() and get_fs(). Remove support for these, along with some infrastructure this renders redundant. We no longer need to flip UAO to access kernel memory under KERNEL_DS, and head.S unconditionally clears UAO for all kernel configurations via an ERET in init_kernel_el. Thus, we don't need to dynamically flip UAO, nor do we need to context-switch it. However, we still need to adjust PAN during SDEI entry. Masking of __user pointers no longer needs to use the dynamic value of addr_limit, and can use a constant derived from the maximum possible userspace task size. A new TASK_SIZE_MAX constant is introduced for this, which is also used by core code. In configurations supporting 52-bit VAs, this may include a region of unusable VA space above a 48-bit TTBR0 limit, but never includes any portion of TTBR1. Note that TASK_SIZE_MAX is an exclusive limit, while USER_DS and KERNEL_DS were inclusive limits, and is converted to a mask by subtracting one. As the SDEI entry code repurposes the otherwise unnecessary pt_regs::orig_addr_limit field to store the TTBR1 of the interrupted context, for now we rename that to pt_regs::sdei_ttbr1. In future we can consider factoring that out. Signed-off-by: Mark Rutland Acked-by: James Morse Cc: Christoph Hellwig Cc: Will Deacon Link: https://lore.kernel.org/r/20201202131558.39270-10-mark.rutland@arm.com Signed-off-by: Catalin Marinas --- arch/arm64/include/asm/exec.h | 1 - 1 file changed, 1 deletion(-) (limited to 'arch/arm64/include/asm/exec.h') diff --git a/arch/arm64/include/asm/exec.h b/arch/arm64/include/asm/exec.h index 1aae6f9962fc..9a1c22ce664b 100644 --- a/arch/arm64/include/asm/exec.h +++ b/arch/arm64/include/asm/exec.h @@ -10,6 +10,5 @@ #include extern unsigned long arch_align_stack(unsigned long sp); -void uao_thread_switch(struct task_struct *next); #endif /* __ASM_EXEC_H */ -- cgit v1.2.3