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ARM: 8796/1: spectre-v1,v1.1: provide helpers for address sanitization

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Introduce C and asm helpers to sanitize user address, taking the
address range they target into account.

Use asm helper for existing sanitization in __copy_from_user().

Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
This commit is contained in:
Julien Thierry
2018-09-11 10:14:50 +01:00
committed by Russell King
parent e3aa624343
commit afaf6838f4
3 changed files with 38 additions and 5 deletions
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11
arch/arm/include/asm/assembler.h
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@@ -467,6 +467,17 @@ THUMB( orr \reg , \reg , #PSR_T_BIT )
#endif
.endm
.macro uaccess_mask_range_ptr, addr:req, size:req, limit:req, tmp:req
#ifdef CONFIG_CPU_SPECTRE
sub \tmp, \limit, #1
subs \tmp, \tmp, \addr @ tmp = limit - 1 - addr
addhs \tmp, \tmp, #1 @ if (tmp >= 0) {
subhss \tmp, \tmp, \size @ tmp = limit - (addr + size) }
movlo \addr, #0 @ if (tmp < 0) addr = NULL
csdb
#endif
.endm
.macro uaccess_disable, tmp, isb=1
#ifdef CONFIG_CPU_SW_DOMAIN_PAN
/*