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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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57f4959bad
'User Access Override' is a new ARMv8.2 feature which allows the
unprivileged load and store instructions to be overridden to behave in
the normal way.
This patch converts {get,put}_user() and friends to use ldtr*/sttr*
instructions - so that they can only access EL0 memory, then enables
UAO when fs==KERNEL_DS so that these functions can access kernel memory.
This allows user space's read/write permissions to be checked against the
page tables, instead of testing addr<USER_DS, then using the kernel's
read/write permissions.
Signed-off-by: James Morse <james.morse@arm.com>
[catalin.marinas@arm.com: move uao_thread_switch() above dsb()]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
/*
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* Based on arch/arm/include/asm/ptrace.h
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*
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* Copyright (C) 1996-2003 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _UAPI__ASM_PTRACE_H
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#define _UAPI__ASM_PTRACE_H
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#include <linux/types.h>
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#include <asm/hwcap.h>
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/*
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* PSR bits
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*/
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#define PSR_MODE_EL0t 0x00000000
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#define PSR_MODE_EL1t 0x00000004
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#define PSR_MODE_EL1h 0x00000005
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#define PSR_MODE_EL2t 0x00000008
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#define PSR_MODE_EL2h 0x00000009
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#define PSR_MODE_EL3t 0x0000000c
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#define PSR_MODE_EL3h 0x0000000d
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#define PSR_MODE_MASK 0x0000000f
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/* AArch32 CPSR bits */
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#define PSR_MODE32_BIT 0x00000010
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/* AArch64 SPSR bits */
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#define PSR_F_BIT 0x00000040
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#define PSR_I_BIT 0x00000080
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#define PSR_A_BIT 0x00000100
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#define PSR_D_BIT 0x00000200
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#define PSR_PAN_BIT 0x00400000
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#define PSR_UAO_BIT 0x00800000
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#define PSR_Q_BIT 0x08000000
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#define PSR_V_BIT 0x10000000
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#define PSR_C_BIT 0x20000000
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#define PSR_Z_BIT 0x40000000
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#define PSR_N_BIT 0x80000000
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/*
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* Groups of PSR bits
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*/
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#define PSR_f 0xff000000 /* Flags */
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#define PSR_s 0x00ff0000 /* Status */
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#define PSR_x 0x0000ff00 /* Extension */
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#define PSR_c 0x000000ff /* Control */
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#ifndef __ASSEMBLY__
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/*
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* User structures for general purpose, floating point and debug registers.
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*/
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struct user_pt_regs {
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__u64 regs[31];
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__u64 sp;
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__u64 pc;
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__u64 pstate;
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};
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struct user_fpsimd_state {
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__uint128_t vregs[32];
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__u32 fpsr;
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__u32 fpcr;
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};
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struct user_hwdebug_state {
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__u32 dbg_info;
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__u32 pad;
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struct {
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__u64 addr;
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__u32 ctrl;
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__u32 pad;
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} dbg_regs[16];
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};
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#endif /* __ASSEMBLY__ */
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#endif /* _UAPI__ASM_PTRACE_H */
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