mirror of
https://github.com/torvalds/linux
synced 2024-10-19 09:49:29 +00:00
766d95b1ed
PAuth adds sign/verify controls to enable and disable groups of instructions in hardware for compatibility with libraries that do not implement PAuth. The kernel always enables them if it detects PAuth. Add a test that checks that each group of instructions is enabled, if the kernel reports PAuth as detected. Note: For groups, for the purpose of this patch, we intend instructions that use a certain key. Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com> Reviewed-by: Vincenzo Frascino <Vincenzo.Frascino@arm.com> Reviewed-by: Amit Daniel Kachhap <amit.kachhap@arm.com> Acked-by: Shuah Khan <skhan@linuxfoundation.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20200918104715.182310-3-boian4o1@gmail.com Signed-off-by: Will Deacon <will@kernel.org>
40 lines
660 B
C
40 lines
660 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (C) 2020 ARM Limited
|
|
|
|
#include "helper.h"
|
|
|
|
size_t keyia_sign(size_t ptr)
|
|
{
|
|
asm volatile("paciza %0" : "+r" (ptr));
|
|
return ptr;
|
|
}
|
|
|
|
size_t keyib_sign(size_t ptr)
|
|
{
|
|
asm volatile("pacizb %0" : "+r" (ptr));
|
|
return ptr;
|
|
}
|
|
|
|
size_t keyda_sign(size_t ptr)
|
|
{
|
|
asm volatile("pacdza %0" : "+r" (ptr));
|
|
return ptr;
|
|
}
|
|
|
|
size_t keydb_sign(size_t ptr)
|
|
{
|
|
asm volatile("pacdzb %0" : "+r" (ptr));
|
|
return ptr;
|
|
}
|
|
|
|
size_t keyg_sign(size_t ptr)
|
|
{
|
|
/* output is encoded in the upper 32 bits */
|
|
size_t dest = 0;
|
|
size_t modifier = 0;
|
|
|
|
asm volatile("pacga %0, %1, %2" : "=r" (dest) : "r" (ptr), "r" (modifier));
|
|
|
|
return dest;
|
|
}
|