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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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36b0cb84ee
An additional 'ip' will be pushed to the stack, for restoring the
DACR later, if CONFIG_CPU_SW_DOMAIN_PAN defined.
However, the fixup still get the err_ptr by add #8*4 to sp, which
results in the fact that the code area pointed by the LR will be
overwritten, or the kernel will crash if CONFIG_DEBUG_RODATA is enabled.
This patch fixes the stack mismatch.
Fixes: a5e090acbf ("ARM: software-based priviledged-no-access support")
Signed-off-by: Lvqiang Huang <Lvqiang.Huang@spreadtrum.com>
Signed-off-by: Chunyan Zhang <zhang.lyra@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
102 lines
2.2 KiB
ArmAsm
102 lines
2.2 KiB
ArmAsm
/*
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* linux/arch/arm/lib/csumpartialcopyuser.S
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*
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* Copyright (C) 1995-1998 Russell King
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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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* 27/03/03 Ian Molton Clean up CONFIG_CPU
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*
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/errno.h>
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#include <asm/asm-offsets.h>
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.text
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#ifdef CONFIG_CPU_SW_DOMAIN_PAN
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.macro save_regs
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mrc p15, 0, ip, c3, c0, 0
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stmfd sp!, {r1, r2, r4 - r8, ip, lr}
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uaccess_enable ip
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.endm
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.macro load_regs
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ldmfd sp!, {r1, r2, r4 - r8, ip, lr}
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mcr p15, 0, ip, c3, c0, 0
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ret lr
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.endm
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#else
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.macro save_regs
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stmfd sp!, {r1, r2, r4 - r8, lr}
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.endm
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.macro load_regs
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ldmfd sp!, {r1, r2, r4 - r8, pc}
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.endm
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#endif
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.macro load1b, reg1
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ldrusr \reg1, r0, 1
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.endm
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.macro load2b, reg1, reg2
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ldrusr \reg1, r0, 1
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ldrusr \reg2, r0, 1
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.endm
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.macro load1l, reg1
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ldrusr \reg1, r0, 4
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.endm
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.macro load2l, reg1, reg2
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ldrusr \reg1, r0, 4
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ldrusr \reg2, r0, 4
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.endm
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.macro load4l, reg1, reg2, reg3, reg4
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ldrusr \reg1, r0, 4
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ldrusr \reg2, r0, 4
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ldrusr \reg3, r0, 4
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ldrusr \reg4, r0, 4
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.endm
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/*
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* unsigned int
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* csum_partial_copy_from_user(const char *src, char *dst, int len, int sum, int *err_ptr)
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* r0 = src, r1 = dst, r2 = len, r3 = sum, [sp] = *err_ptr
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* Returns : r0 = checksum, [[sp, #0], #0] = 0 or -EFAULT
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*/
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#define FN_ENTRY ENTRY(csum_partial_copy_from_user)
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#define FN_EXIT ENDPROC(csum_partial_copy_from_user)
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#include "csumpartialcopygeneric.S"
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/*
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* FIXME: minor buglet here
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* We don't return the checksum for the data present in the buffer. To do
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* so properly, we would have to add in whatever registers were loaded before
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* the fault, which, with the current asm above is not predictable.
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*/
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.pushsection .text.fixup,"ax"
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.align 4
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9001: mov r4, #-EFAULT
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#ifdef CONFIG_CPU_SW_DOMAIN_PAN
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ldr r5, [sp, #9*4] @ *err_ptr
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#else
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ldr r5, [sp, #8*4] @ *err_ptr
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#endif
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str r4, [r5]
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ldmia sp, {r1, r2} @ retrieve dst, len
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add r2, r2, r1
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mov r0, #0 @ zero the buffer
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9002: teq r2, r1
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strneb r0, [r1], #1
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bne 9002b
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load_regs
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.popsection
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