cf98bc28d3
The syscall number is stored in the same register as the syscall return on amd64 (and possibly other architectures) and so it is impossible to recover in the signal handler after the call has returned. This small tweak delivers it in the `si_value` field of the signal, which is sufficient to catch capability violations and emulate them with a call to a more-privileged process in the signal handler. This reapplies 3a522ba1bc852c3d4660a4fa32e4a94999d09a47 with a fix for the static assertion failure on i386. Approved by: markj (mentor) Reviewed by: kib, bcr (manpages) Differential Revision: https://reviews.freebsd.org/D29185
85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $NetBSD: proc.h,v 1.2 1997/04/16 22:57:48 thorpej Exp $
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PROC_H_
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#define _MACHINE_PROC_H_
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/*
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* Machine-dependent part of the proc structure
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*/
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struct mdthread {
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int md_spinlock_count; /* (k) */
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register_t md_saved_msr; /* (k) */
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};
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struct mdproc {
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/*
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* Avoid empty structs because they are undefined behavior.
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*/
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long md_spare;
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};
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#ifdef __powerpc64__
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#define KINFO_PROC_SIZE 1088
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#define KINFO_PROC32_SIZE 816
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#else
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#define KINFO_PROC_SIZE 816
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#endif
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#define MAXARGS 8
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struct syscall_args {
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u_int code;
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u_int original_code;
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struct sysent *callp;
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register_t args[MAXARGS];
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};
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#ifdef _KERNEL
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#include <machine/pcb.h>
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/* Get the current kernel thread stack usage. */
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#define GET_STACK_USAGE(total, used) do { \
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struct thread *td = curthread; \
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(total) = td->td_kstack_pages * PAGE_SIZE - sizeof(struct pcb); \
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(used) = (char *)td->td_kstack + \
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td->td_kstack_pages * PAGE_SIZE - \
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(char *)&td; \
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} while (0)
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#endif
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#endif /* !_MACHINE_PROC_H_ */
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