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Add some tests that verify that BTI functions correctly for static binaries built with and without BTI support, verifying that SIGILL is generated when expected and is not generated in other situations. Since BTI support is still being rolled out in distributions these tests are built entirely free standing, no libc support is used at all so none of the standard helper functions for kselftest can be used and we open code everything. This also means we aren't testing the kernel support for the dynamic linker, though the test program can be readily adapted for that once it becomes something that we can reliably build and run. These tests were originally written by Dave Martin, I've adapted them for kselftest, mainly around the build system and the output format. Signed-off-by: Mark Brown <broonie@kernel.org> Cc: Dave Martin <Dave.Martin@arm.com> Link: https://lore.kernel.org/r/20210309193731.57247-1-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
81 lines
1.2 KiB
C
81 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2019 Arm Limited
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* Original author: Dave Martin <Dave.Martin@arm.com>
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*/
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#ifndef ASSEMBLER_H
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#define ASSEMBLER_H
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#define NT_GNU_PROPERTY_TYPE_0 5
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#define GNU_PROPERTY_AARCH64_FEATURE_1_AND 0xc0000000
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/* Bits for GNU_PROPERTY_AARCH64_FEATURE_1_BTI */
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#define GNU_PROPERTY_AARCH64_FEATURE_1_BTI (1U << 0)
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#define GNU_PROPERTY_AARCH64_FEATURE_1_PAC (1U << 1)
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.macro startfn name:req
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.globl \name
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\name:
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.macro endfn
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.size \name, . - \name
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.type \name, @function
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.purgem endfn
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.endm
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.endm
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.macro emit_aarch64_feature_1_and
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.pushsection .note.gnu.property, "a"
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.align 3
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.long 2f - 1f
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.long 6f - 3f
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.long NT_GNU_PROPERTY_TYPE_0
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1: .string "GNU"
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2:
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.align 3
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3: .long GNU_PROPERTY_AARCH64_FEATURE_1_AND
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.long 5f - 4f
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4:
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#if BTI
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.long GNU_PROPERTY_AARCH64_FEATURE_1_PAC | \
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GNU_PROPERTY_AARCH64_FEATURE_1_BTI
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#else
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.long 0
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#endif
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5:
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.align 3
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6:
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.popsection
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.endm
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.macro paciasp
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hint 0x19
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.endm
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.macro autiasp
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hint 0x1d
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.endm
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.macro __bti_
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hint 0x20
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.endm
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.macro __bti_c
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hint 0x22
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.endm
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.macro __bti_j
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hint 0x24
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.endm
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.macro __bti_jc
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hint 0x26
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.endm
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.macro bti what=
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__bti_\what
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.endm
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#endif /* ! ASSEMBLER_H */
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