mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
5d8beee20d
Given the fact that the ACPI "EINJ" (error injection) facility is not universally available, implement software infrastructure to validate the memcpy_mcsafe() exception handling implementation. For each potential read exception point in memcpy_mcsafe(), inject a emulated exception point at the address identified by 'mcsafe_inject' variable. With this infrastructure implement a test to validate that the 'bytes remaining' calculation is correct for a range of various source buffer alignments. This code is compiled out by default. The CONFIG_MCSAFE_DEBUG configuration symbol needs to be manually enabled by editing Kconfig.debug. I.e. this functionality can not be accidentally enabled by a user / distro, it's only for development. Cc: <x86@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Reported-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
76 lines
1.4 KiB
C
76 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _MCSAFE_TEST_H_
|
|
#define _MCSAFE_TEST_H_
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#ifdef CONFIG_MCSAFE_TEST
|
|
extern unsigned long mcsafe_test_src;
|
|
extern unsigned long mcsafe_test_dst;
|
|
|
|
static inline void mcsafe_inject_src(void *addr)
|
|
{
|
|
if (addr)
|
|
mcsafe_test_src = (unsigned long) addr;
|
|
else
|
|
mcsafe_test_src = ~0UL;
|
|
}
|
|
|
|
static inline void mcsafe_inject_dst(void *addr)
|
|
{
|
|
if (addr)
|
|
mcsafe_test_dst = (unsigned long) addr;
|
|
else
|
|
mcsafe_test_dst = ~0UL;
|
|
}
|
|
#else /* CONFIG_MCSAFE_TEST */
|
|
static inline void mcsafe_inject_src(void *addr)
|
|
{
|
|
}
|
|
|
|
static inline void mcsafe_inject_dst(void *addr)
|
|
{
|
|
}
|
|
#endif /* CONFIG_MCSAFE_TEST */
|
|
|
|
#else /* __ASSEMBLY__ */
|
|
#include <asm/export.h>
|
|
|
|
#ifdef CONFIG_MCSAFE_TEST
|
|
.macro MCSAFE_TEST_CTL
|
|
.pushsection .data
|
|
.align 8
|
|
.globl mcsafe_test_src
|
|
mcsafe_test_src:
|
|
.quad 0
|
|
EXPORT_SYMBOL_GPL(mcsafe_test_src)
|
|
.globl mcsafe_test_dst
|
|
mcsafe_test_dst:
|
|
.quad 0
|
|
EXPORT_SYMBOL_GPL(mcsafe_test_dst)
|
|
.popsection
|
|
.endm
|
|
|
|
.macro MCSAFE_TEST_SRC reg count target
|
|
leaq \count(\reg), %r9
|
|
cmp mcsafe_test_src, %r9
|
|
ja \target
|
|
.endm
|
|
|
|
.macro MCSAFE_TEST_DST reg count target
|
|
leaq \count(\reg), %r9
|
|
cmp mcsafe_test_dst, %r9
|
|
ja \target
|
|
.endm
|
|
#else
|
|
.macro MCSAFE_TEST_CTL
|
|
.endm
|
|
|
|
.macro MCSAFE_TEST_SRC reg count target
|
|
.endm
|
|
|
|
.macro MCSAFE_TEST_DST reg count target
|
|
.endm
|
|
#endif /* CONFIG_MCSAFE_TEST */
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* _MCSAFE_TEST_H_ */
|