fd8f4f3beb
While not strictly true this stops them from trying to use the KCSAN atomic hooks and allows these to be compiled into the same kernel. Sponsored by: Innovate UK
240 lines
6.2 KiB
C
240 lines
6.2 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (C) 2018 The FreeBSD Foundation. All rights reserved.
|
|
* Copyright (C) 2018, 2019 Andrew Turner
|
|
*
|
|
* This software was developed by Mitchell Horne under sponsorship of
|
|
* the FreeBSD Foundation.
|
|
*
|
|
* This software was developed by SRI International and the University of
|
|
* Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
|
|
* ("CTSRD"), as part of the DARPA CRASH research programme.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#define KCSAN_RUNTIME
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/coverage.h>
|
|
|
|
#include <machine/atomic.h>
|
|
|
|
void __sanitizer_cov_trace_pc(void);
|
|
void __sanitizer_cov_trace_cmp1(uint8_t, uint8_t);
|
|
void __sanitizer_cov_trace_cmp2(uint16_t, uint16_t);
|
|
void __sanitizer_cov_trace_cmp4(uint32_t, uint32_t);
|
|
void __sanitizer_cov_trace_cmp8(uint64_t, uint64_t);
|
|
void __sanitizer_cov_trace_const_cmp1(uint8_t, uint8_t);
|
|
void __sanitizer_cov_trace_const_cmp2(uint16_t, uint16_t);
|
|
void __sanitizer_cov_trace_const_cmp4(uint32_t, uint32_t);
|
|
void __sanitizer_cov_trace_const_cmp8(uint64_t, uint64_t);
|
|
void __sanitizer_cov_trace_switch(uint64_t, uint64_t *);
|
|
|
|
static cov_trace_pc_t cov_trace_pc;
|
|
static cov_trace_cmp_t cov_trace_cmp;
|
|
|
|
void
|
|
cov_register_pc(cov_trace_pc_t trace_pc)
|
|
{
|
|
|
|
atomic_store_ptr(&cov_trace_pc, trace_pc);
|
|
}
|
|
|
|
void
|
|
cov_unregister_pc(void)
|
|
{
|
|
|
|
atomic_store_ptr(&cov_trace_pc, NULL);
|
|
}
|
|
|
|
void
|
|
cov_register_cmp(cov_trace_cmp_t trace_cmp)
|
|
{
|
|
|
|
atomic_store_ptr(&cov_trace_cmp, trace_cmp);
|
|
}
|
|
|
|
void
|
|
cov_unregister_cmp(void)
|
|
{
|
|
|
|
atomic_store_ptr(&cov_trace_cmp, NULL);
|
|
}
|
|
|
|
/*
|
|
* Main entry point. A call to this function will be inserted
|
|
* at every edge, and if coverage is enabled for the thread
|
|
* this function will add the PC to the buffer.
|
|
*/
|
|
void
|
|
__sanitizer_cov_trace_pc(void)
|
|
{
|
|
cov_trace_pc_t trace_pc;
|
|
|
|
trace_pc = atomic_load_ptr(&cov_trace_pc);
|
|
if (trace_pc != NULL)
|
|
trace_pc((uint64_t)__builtin_return_address(0));
|
|
}
|
|
|
|
/*
|
|
* Comparison entry points. When the kernel performs a comparison
|
|
* operation the compiler inserts a call to one of the following
|
|
* functions to record the operation.
|
|
*/
|
|
void
|
|
__sanitizer_cov_trace_cmp1(uint8_t arg1, uint8_t arg2)
|
|
{
|
|
cov_trace_cmp_t trace_cmp;
|
|
|
|
trace_cmp = atomic_load_ptr(&cov_trace_cmp);
|
|
if (trace_cmp != NULL)
|
|
trace_cmp(COV_CMP_SIZE(0), arg1, arg2,
|
|
(uint64_t)__builtin_return_address(0));
|
|
}
|
|
|
|
void
|
|
__sanitizer_cov_trace_cmp2(uint16_t arg1, uint16_t arg2)
|
|
{
|
|
cov_trace_cmp_t trace_cmp;
|
|
|
|
trace_cmp = atomic_load_ptr(&cov_trace_cmp);
|
|
if (trace_cmp != NULL)
|
|
trace_cmp(COV_CMP_SIZE(1), arg1, arg2,
|
|
(uint64_t)__builtin_return_address(0));
|
|
}
|
|
|
|
void
|
|
__sanitizer_cov_trace_cmp4(uint32_t arg1, uint32_t arg2)
|
|
{
|
|
cov_trace_cmp_t trace_cmp;
|
|
|
|
trace_cmp = atomic_load_ptr(&cov_trace_cmp);
|
|
if (trace_cmp != NULL)
|
|
trace_cmp(COV_CMP_SIZE(2), arg1, arg2,
|
|
(uint64_t)__builtin_return_address(0));
|
|
}
|
|
|
|
void
|
|
__sanitizer_cov_trace_cmp8(uint64_t arg1, uint64_t arg2)
|
|
{
|
|
cov_trace_cmp_t trace_cmp;
|
|
|
|
trace_cmp = atomic_load_ptr(&cov_trace_cmp);
|
|
if (trace_cmp != NULL)
|
|
trace_cmp(COV_CMP_SIZE(3), arg1, arg2,
|
|
(uint64_t)__builtin_return_address(0));
|
|
}
|
|
|
|
void
|
|
__sanitizer_cov_trace_const_cmp1(uint8_t arg1, uint8_t arg2)
|
|
{
|
|
cov_trace_cmp_t trace_cmp;
|
|
|
|
trace_cmp = atomic_load_ptr(&cov_trace_cmp);
|
|
if (trace_cmp != NULL)
|
|
trace_cmp(COV_CMP_SIZE(0) | COV_CMP_CONST, arg1, arg2,
|
|
(uint64_t)__builtin_return_address(0));
|
|
}
|
|
|
|
void
|
|
__sanitizer_cov_trace_const_cmp2(uint16_t arg1, uint16_t arg2)
|
|
{
|
|
cov_trace_cmp_t trace_cmp;
|
|
|
|
trace_cmp = atomic_load_ptr(&cov_trace_cmp);
|
|
if (trace_cmp != NULL)
|
|
trace_cmp(COV_CMP_SIZE(1) | COV_CMP_CONST, arg1, arg2,
|
|
(uint64_t)__builtin_return_address(0));
|
|
}
|
|
|
|
void
|
|
__sanitizer_cov_trace_const_cmp4(uint32_t arg1, uint32_t arg2)
|
|
{
|
|
cov_trace_cmp_t trace_cmp;
|
|
|
|
trace_cmp = atomic_load_ptr(&cov_trace_cmp);
|
|
if (trace_cmp != NULL)
|
|
trace_cmp(COV_CMP_SIZE(2) | COV_CMP_CONST, arg1, arg2,
|
|
(uint64_t)__builtin_return_address(0));
|
|
}
|
|
|
|
void
|
|
__sanitizer_cov_trace_const_cmp8(uint64_t arg1, uint64_t arg2)
|
|
{
|
|
cov_trace_cmp_t trace_cmp;
|
|
|
|
trace_cmp = atomic_load_ptr(&cov_trace_cmp);
|
|
if (trace_cmp != NULL)
|
|
trace_cmp(COV_CMP_SIZE(3) | COV_CMP_CONST, arg1, arg2,
|
|
(uint64_t)__builtin_return_address(0));
|
|
}
|
|
|
|
/*
|
|
* val is the switch operand
|
|
* cases[0] is the number of case constants
|
|
* cases[1] is the size of val in bits
|
|
* cases[2..n] are the case constants
|
|
*/
|
|
void
|
|
__sanitizer_cov_trace_switch(uint64_t val, uint64_t *cases)
|
|
{
|
|
uint64_t i, count, ret, type;
|
|
cov_trace_cmp_t trace_cmp;
|
|
|
|
trace_cmp = atomic_load_ptr(&cov_trace_cmp);
|
|
if (trace_cmp == NULL)
|
|
return;
|
|
|
|
count = cases[0];
|
|
ret = (uint64_t)__builtin_return_address(0);
|
|
|
|
switch (cases[1]) {
|
|
case 8:
|
|
type = COV_CMP_SIZE(0);
|
|
break;
|
|
case 16:
|
|
type = COV_CMP_SIZE(1);
|
|
break;
|
|
case 32:
|
|
type = COV_CMP_SIZE(2);
|
|
break;
|
|
case 64:
|
|
type = COV_CMP_SIZE(3);
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
val |= COV_CMP_CONST;
|
|
|
|
for (i = 0; i < count; i++)
|
|
if (!trace_cmp(type, val, cases[i + 2], ret))
|
|
return;
|
|
}
|