3fbdb3c215
changes in MD code are trivial, before this change, trapsignal and sendsig use discrete parameters, now they uses member fields of ksiginfo_t structure. For sendsig, this change allows us to pass POSIX realtime signal value to user code. 2. Remove cpu_thread_siginfo, it is no longer needed because we now always generate ksiginfo_t data and feed it to libpthread. 3. Add p_sigqueue to proc structure to hold shared signals which were blocked by all threads in the proc. 4. Add td_sigqueue to thread structure to hold all signals delivered to thread. 5. i386 and amd64 now return POSIX standard si_code, other arches will be fixed. 6. In this sigqueue implementation, pending signal set is kept as before, an extra siginfo list holds additional siginfo_t data for signals. kernel code uses psignal() still behavior as before, it won't be failed even under memory pressure, only exception is when deleting a signal, we should call sigqueue_delete to remove signal from sigqueue but not SIGDELSET. Current there is no kernel code will deliver a signal with additional data, so kernel should be as stable as before, a ksiginfo can carry more information, for example, allow signal to be delivered but throw away siginfo data if memory is not enough. SIGKILL and SIGSTOP have fast path in sigqueue_add, because they can not be caught or masked. The sigqueue() syscall allows user code to queue a signal to target process, if resource is unavailable, EAGAIN will be returned as specification said. Just before thread exits, signal queue memory will be freed by sigqueue_flush. Current, all signals are allowed to be queued, not only realtime signals. Earlier patch reviewed by: jhb, deischen Tested on: i386, amd64
759 lines
22 KiB
C
759 lines
22 KiB
C
/*-
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* Copyright (c) 2003 Peter Wemm
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* Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/exec.h>
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#include <sys/fcntl.h>
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#include <sys/imgact.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mutex.h>
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#include <sys/mman.h>
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#include <sys/namei.h>
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#include <sys/pioctl.h>
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#include <sys/proc.h>
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#include <sys/procfs.h>
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#include <sys/resourcevar.h>
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#include <sys/systm.h>
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#include <sys/signalvar.h>
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#include <sys/stat.h>
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#include <sys/sx.h>
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#include <sys/syscall.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/vnode.h>
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#include <vm/vm.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_object.h>
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#include <vm/vm_extern.h>
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#include <compat/freebsd32/freebsd32_util.h>
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#include <compat/freebsd32/freebsd32_proto.h>
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#include <compat/ia32/ia32_signal.h>
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#include <machine/psl.h>
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#include <machine/segments.h>
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#include <machine/specialreg.h>
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#include <machine/frame.h>
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#include <machine/md_var.h>
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#include <machine/pcb.h>
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#include <machine/cpufunc.h>
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#ifdef COMPAT_FREEBSD4
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static void freebsd4_ia32_sendsig(sig_t, ksiginfo_t *, sigset_t *);
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#endif
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static void ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp);
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static int ia32_set_fpcontext(struct thread *td, const struct ia32_mcontext *mcp);
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extern int _ucode32sel, _udatasel;
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#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
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#define EFL_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
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static void
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ia32_get_fpcontext(struct thread *td, struct ia32_mcontext *mcp)
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{
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mcp->mc_ownedfp = fpugetregs(td, (struct savefpu *)&mcp->mc_fpstate);
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mcp->mc_fpformat = fpuformat();
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}
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static int
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ia32_set_fpcontext(struct thread *td, const struct ia32_mcontext *mcp)
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{
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if (mcp->mc_fpformat == _MC_FPFMT_NODEV)
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return (0);
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else if (mcp->mc_fpformat != _MC_FPFMT_XMM)
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return (EINVAL);
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else if (mcp->mc_ownedfp == _MC_FPOWNED_NONE)
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/* We don't care what state is left in the FPU or PCB. */
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fpstate_drop(td);
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else if (mcp->mc_ownedfp == _MC_FPOWNED_FPU ||
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mcp->mc_ownedfp == _MC_FPOWNED_PCB) {
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/*
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* XXX we violate the dubious requirement that fpusetregs()
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* be called with interrupts disabled.
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*/
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fpusetregs(td, (struct savefpu *)&mcp->mc_fpstate);
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} else
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return (EINVAL);
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return (0);
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}
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/*
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* Get machine context.
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*/
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static int
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ia32_get_mcontext(struct thread *td, struct ia32_mcontext *mcp, int flags)
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{
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struct trapframe *tp;
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tp = td->td_frame;
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PROC_LOCK(curthread->td_proc);
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mcp->mc_onstack = sigonstack(tp->tf_rsp);
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PROC_UNLOCK(curthread->td_proc);
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mcp->mc_gs = td->td_pcb->pcb_gs;
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mcp->mc_fs = td->td_pcb->pcb_fs;
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mcp->mc_es = td->td_pcb->pcb_es;
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mcp->mc_ds = td->td_pcb->pcb_ds;
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mcp->mc_edi = tp->tf_rdi;
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mcp->mc_esi = tp->tf_rsi;
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mcp->mc_ebp = tp->tf_rbp;
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mcp->mc_isp = tp->tf_rsp;
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if (flags & GET_MC_CLEAR_RET) {
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mcp->mc_eax = 0;
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mcp->mc_edx = 0;
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} else {
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mcp->mc_eax = tp->tf_rax;
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mcp->mc_edx = tp->tf_rdx;
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}
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mcp->mc_ebx = tp->tf_rbx;
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mcp->mc_ecx = tp->tf_rcx;
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mcp->mc_eip = tp->tf_rip;
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mcp->mc_cs = tp->tf_cs;
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mcp->mc_eflags = tp->tf_rflags;
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mcp->mc_esp = tp->tf_rsp;
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mcp->mc_ss = tp->tf_ss;
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mcp->mc_len = sizeof(*mcp);
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ia32_get_fpcontext(td, mcp);
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return (0);
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}
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/*
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* Set machine context.
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*
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* However, we don't set any but the user modifiable flags, and we won't
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* touch the cs selector.
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*/
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static int
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ia32_set_mcontext(struct thread *td, const struct ia32_mcontext *mcp)
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{
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struct trapframe *tp;
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long rflags;
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int ret;
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tp = td->td_frame;
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if (mcp->mc_len != sizeof(*mcp))
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return (EINVAL);
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rflags = (mcp->mc_eflags & PSL_USERCHANGE) |
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(tp->tf_rflags & ~PSL_USERCHANGE);
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ret = ia32_set_fpcontext(td, mcp);
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if (ret != 0)
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return (ret);
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#if 0 /* XXX deal with load_fs() and friends */
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tp->tf_fs = mcp->mc_fs;
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tp->tf_es = mcp->mc_es;
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tp->tf_ds = mcp->mc_ds;
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#endif
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tp->tf_rdi = mcp->mc_edi;
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tp->tf_rsi = mcp->mc_esi;
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tp->tf_rbp = mcp->mc_ebp;
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tp->tf_rbx = mcp->mc_ebx;
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tp->tf_rdx = mcp->mc_edx;
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tp->tf_rcx = mcp->mc_ecx;
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tp->tf_rax = mcp->mc_eax;
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/* trapno, err */
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tp->tf_rip = mcp->mc_eip;
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tp->tf_rflags = rflags;
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tp->tf_rsp = mcp->mc_esp;
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tp->tf_ss = mcp->mc_ss;
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#if 0 /* XXX deal with load_gs() and friends */
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td->td_pcb->pcb_gs = mcp->mc_gs;
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#endif
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td->td_pcb->pcb_flags |= PCB_FULLCTX;
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return (0);
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}
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/*
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* The first two fields of a ucontext_t are the signal mask and
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* the machine context. The next field is uc_link; we want to
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* avoid destroying the link when copying out contexts.
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*/
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#define UC_COPY_SIZE offsetof(struct ia32_ucontext, uc_link)
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int
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freebsd32_getcontext(struct thread *td, struct freebsd32_getcontext_args *uap)
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{
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struct ia32_ucontext uc;
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int ret;
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if (uap->ucp == NULL)
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ret = EINVAL;
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else {
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ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
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PROC_LOCK(td->td_proc);
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uc.uc_sigmask = td->td_sigmask;
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PROC_UNLOCK(td->td_proc);
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ret = copyout(&uc, uap->ucp, UC_COPY_SIZE);
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}
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return (ret);
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}
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int
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freebsd32_setcontext(struct thread *td, struct freebsd32_setcontext_args *uap)
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{
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struct ia32_ucontext uc;
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int ret;
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if (uap->ucp == NULL)
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ret = EINVAL;
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else {
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ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
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if (ret == 0) {
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ret = ia32_set_mcontext(td, &uc.uc_mcontext);
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if (ret == 0) {
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SIG_CANTMASK(uc.uc_sigmask);
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PROC_LOCK(td->td_proc);
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td->td_sigmask = uc.uc_sigmask;
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PROC_UNLOCK(td->td_proc);
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}
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}
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}
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return (ret == 0 ? EJUSTRETURN : ret);
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}
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int
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freebsd32_swapcontext(struct thread *td, struct freebsd32_swapcontext_args *uap)
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{
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struct ia32_ucontext uc;
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int ret;
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if (uap->oucp == NULL || uap->ucp == NULL)
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ret = EINVAL;
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else {
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ia32_get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
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PROC_LOCK(td->td_proc);
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uc.uc_sigmask = td->td_sigmask;
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PROC_UNLOCK(td->td_proc);
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ret = copyout(&uc, uap->oucp, UC_COPY_SIZE);
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if (ret == 0) {
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ret = copyin(uap->ucp, &uc, UC_COPY_SIZE);
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if (ret == 0) {
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ret = ia32_set_mcontext(td, &uc.uc_mcontext);
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if (ret == 0) {
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SIG_CANTMASK(uc.uc_sigmask);
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PROC_LOCK(td->td_proc);
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td->td_sigmask = uc.uc_sigmask;
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PROC_UNLOCK(td->td_proc);
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}
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}
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}
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}
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return (ret == 0 ? EJUSTRETURN : ret);
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}
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/*
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* Send an interrupt to process.
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*
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* Stack is set up to allow sigcode stored
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* at top to call routine, followed by kcall
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* to sigreturn routine below. After sigreturn
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* resets the signal mask, the stack, and the
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* frame pointer, it returns to the user
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* specified pc, psl.
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*/
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#ifdef COMPAT_FREEBSD4
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static void
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freebsd4_ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
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{
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struct ia32_sigframe4 sf, *sfp;
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struct ia32_siginfo siginfo;
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struct proc *p;
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struct thread *td;
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struct sigacts *psp;
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struct trapframe *regs;
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int oonstack;
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int sig;
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td = curthread;
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p = td->td_proc;
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siginfo_to_ia32siginfo(&ksi->ksi_info, &siginfo);
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PROC_LOCK_ASSERT(p, MA_OWNED);
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sig = siginfo.si_signo;
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psp = p->p_sigacts;
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mtx_assert(&psp->ps_mtx, MA_OWNED);
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regs = td->td_frame;
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oonstack = sigonstack(regs->tf_rsp);
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/* Save user context. */
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bzero(&sf, sizeof(sf));
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sf.sf_uc.uc_sigmask = *mask;
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sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
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sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
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sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
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? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
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sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
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sf.sf_uc.uc_mcontext.mc_gs = rgs();
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sf.sf_uc.uc_mcontext.mc_fs = rfs();
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__asm __volatile("movl %%es,%0" : "=rm" (sf.sf_uc.uc_mcontext.mc_es));
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__asm __volatile("movl %%ds,%0" : "=rm" (sf.sf_uc.uc_mcontext.mc_ds));
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sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
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sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
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sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
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sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
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sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
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sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
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sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
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sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
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sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
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sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
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sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
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sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
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sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
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sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
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sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
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/* Allocate space for the signal handler context. */
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if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
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SIGISMEMBER(psp->ps_sigonstack, sig)) {
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sfp = (struct ia32_sigframe4 *)(td->td_sigstk.ss_sp +
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td->td_sigstk.ss_size - sizeof(sf));
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} else
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sfp = (struct ia32_sigframe4 *)regs->tf_rsp - 1;
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PROC_UNLOCK(p);
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/* Translate the signal if appropriate. */
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if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
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sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
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/* Build the argument list for the signal handler. */
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sf.sf_signum = sig;
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sf.sf_ucontext = (register_t)&sfp->sf_uc;
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if (SIGISMEMBER(psp->ps_siginfo, sig)) {
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/* Signal handler installed with SA_SIGINFO. */
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sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
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sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
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/* Fill in POSIX parts */
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sf.sf_si = siginfo;
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sf.sf_si.si_signo = sig;
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} else {
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/* Old FreeBSD-style arguments. */
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sf.sf_siginfo = siginfo.si_code;
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sf.sf_addr = (u_int32_t)siginfo.si_addr;
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sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
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}
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mtx_unlock(&psp->ps_mtx);
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/*
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* Copy the sigframe out to the user's stack.
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*/
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if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
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#ifdef DEBUG
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printf("process %ld has trashed its stack\n", (long)p->p_pid);
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#endif
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PROC_LOCK(p);
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sigexit(td, SIGILL);
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}
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regs->tf_rsp = (uintptr_t)sfp;
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regs->tf_rip = FREEBSD32_PS_STRINGS - sz_freebsd4_ia32_sigcode;
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regs->tf_rflags &= ~PSL_T;
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regs->tf_cs = _ucode32sel;
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regs->tf_ss = _udatasel;
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load_ds(_udatasel);
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td->td_pcb->pcb_ds = _udatasel;
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load_es(_udatasel);
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td->td_pcb->pcb_es = _udatasel;
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/* leave user %fs and %gs untouched */
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PROC_LOCK(p);
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mtx_lock(&psp->ps_mtx);
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}
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#endif /* COMPAT_FREEBSD4 */
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void
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ia32_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
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{
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struct ia32_sigframe sf, *sfp;
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struct ia32_siginfo siginfo;
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struct proc *p;
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struct thread *td;
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struct sigacts *psp;
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char *sp;
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struct trapframe *regs;
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int oonstack;
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int sig;
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siginfo_to_ia32siginfo(&ksi->ksi_info, &siginfo);
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td = curthread;
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p = td->td_proc;
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PROC_LOCK_ASSERT(p, MA_OWNED);
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sig = siginfo.si_signo;
|
|
psp = p->p_sigacts;
|
|
#ifdef COMPAT_FREEBSD4
|
|
if (SIGISMEMBER(psp->ps_freebsd4, sig)) {
|
|
freebsd4_ia32_sendsig(catcher, ksi, mask);
|
|
return;
|
|
}
|
|
#endif
|
|
mtx_assert(&psp->ps_mtx, MA_OWNED);
|
|
regs = td->td_frame;
|
|
oonstack = sigonstack(regs->tf_rsp);
|
|
|
|
/* Save user context. */
|
|
bzero(&sf, sizeof(sf));
|
|
sf.sf_uc.uc_sigmask = *mask;
|
|
sf.sf_uc.uc_stack.ss_sp = (uintptr_t)td->td_sigstk.ss_sp;
|
|
sf.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
|
|
sf.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
|
|
? ((oonstack) ? SS_ONSTACK : 0) : SS_DISABLE;
|
|
sf.sf_uc.uc_mcontext.mc_onstack = (oonstack) ? 1 : 0;
|
|
sf.sf_uc.uc_mcontext.mc_gs = rgs();
|
|
sf.sf_uc.uc_mcontext.mc_fs = rfs();
|
|
__asm __volatile("movl %%es,%0" : "=rm" (sf.sf_uc.uc_mcontext.mc_es));
|
|
__asm __volatile("movl %%ds,%0" : "=rm" (sf.sf_uc.uc_mcontext.mc_ds));
|
|
sf.sf_uc.uc_mcontext.mc_edi = regs->tf_rdi;
|
|
sf.sf_uc.uc_mcontext.mc_esi = regs->tf_rsi;
|
|
sf.sf_uc.uc_mcontext.mc_ebp = regs->tf_rbp;
|
|
sf.sf_uc.uc_mcontext.mc_isp = regs->tf_rsp; /* XXX */
|
|
sf.sf_uc.uc_mcontext.mc_ebx = regs->tf_rbx;
|
|
sf.sf_uc.uc_mcontext.mc_edx = regs->tf_rdx;
|
|
sf.sf_uc.uc_mcontext.mc_ecx = regs->tf_rcx;
|
|
sf.sf_uc.uc_mcontext.mc_eax = regs->tf_rax;
|
|
sf.sf_uc.uc_mcontext.mc_trapno = regs->tf_trapno;
|
|
sf.sf_uc.uc_mcontext.mc_err = regs->tf_err;
|
|
sf.sf_uc.uc_mcontext.mc_eip = regs->tf_rip;
|
|
sf.sf_uc.uc_mcontext.mc_cs = regs->tf_cs;
|
|
sf.sf_uc.uc_mcontext.mc_eflags = regs->tf_rflags;
|
|
sf.sf_uc.uc_mcontext.mc_esp = regs->tf_rsp;
|
|
sf.sf_uc.uc_mcontext.mc_ss = regs->tf_ss;
|
|
sf.sf_uc.uc_mcontext.mc_len = sizeof(sf.sf_uc.uc_mcontext); /* magic */
|
|
ia32_get_fpcontext(td, &sf.sf_uc.uc_mcontext);
|
|
fpstate_drop(td);
|
|
|
|
/* Allocate space for the signal handler context. */
|
|
if ((td->td_pflags & TDP_ALTSTACK) != 0 && !oonstack &&
|
|
SIGISMEMBER(psp->ps_sigonstack, sig)) {
|
|
sp = td->td_sigstk.ss_sp +
|
|
td->td_sigstk.ss_size - sizeof(sf);
|
|
} else
|
|
sp = (char *)regs->tf_rsp - sizeof(sf);
|
|
/* Align to 16 bytes. */
|
|
sfp = (struct ia32_sigframe *)((uintptr_t)sp & ~0xF);
|
|
PROC_UNLOCK(p);
|
|
|
|
/* Translate the signal if appropriate. */
|
|
if (p->p_sysent->sv_sigtbl && sig <= p->p_sysent->sv_sigsize)
|
|
sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
|
|
|
|
/* Build the argument list for the signal handler. */
|
|
sf.sf_signum = sig;
|
|
sf.sf_ucontext = (register_t)&sfp->sf_uc;
|
|
if (SIGISMEMBER(psp->ps_siginfo, sig)) {
|
|
/* Signal handler installed with SA_SIGINFO. */
|
|
sf.sf_siginfo = (u_int32_t)(uintptr_t)&sfp->sf_si;
|
|
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
|
|
|
|
/* Fill in POSIX parts */
|
|
sf.sf_si = siginfo;
|
|
sf.sf_si.si_signo = sig;
|
|
} else {
|
|
/* Old FreeBSD-style arguments. */
|
|
sf.sf_siginfo = siginfo.si_code;
|
|
sf.sf_addr = (u_int32_t)siginfo.si_addr;
|
|
sf.sf_ah = (u_int32_t)(uintptr_t)catcher;
|
|
}
|
|
mtx_unlock(&psp->ps_mtx);
|
|
|
|
/*
|
|
* Copy the sigframe out to the user's stack.
|
|
*/
|
|
if (copyout(&sf, sfp, sizeof(*sfp)) != 0) {
|
|
#ifdef DEBUG
|
|
printf("process %ld has trashed its stack\n", (long)p->p_pid);
|
|
#endif
|
|
PROC_LOCK(p);
|
|
sigexit(td, SIGILL);
|
|
}
|
|
|
|
regs->tf_rsp = (uintptr_t)sfp;
|
|
regs->tf_rip = FREEBSD32_PS_STRINGS - *(p->p_sysent->sv_szsigcode);
|
|
regs->tf_rflags &= ~PSL_T;
|
|
regs->tf_cs = _ucode32sel;
|
|
regs->tf_ss = _udatasel;
|
|
load_ds(_udatasel);
|
|
td->td_pcb->pcb_ds = _udatasel;
|
|
load_es(_udatasel);
|
|
td->td_pcb->pcb_es = _udatasel;
|
|
/* leave user %fs and %gs untouched */
|
|
PROC_LOCK(p);
|
|
mtx_lock(&psp->ps_mtx);
|
|
}
|
|
|
|
/*
|
|
* System call to cleanup state after a signal
|
|
* has been taken. Reset signal mask and
|
|
* stack state from context left by sendsig (above).
|
|
* Return to previous pc and psl as specified by
|
|
* context left by sendsig. Check carefully to
|
|
* make sure that the user has not modified the
|
|
* state to gain improper privileges.
|
|
*/
|
|
#ifdef COMPAT_FREEBSD4
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
freebsd4_freebsd32_sigreturn(td, uap)
|
|
struct thread *td;
|
|
struct freebsd4_freebsd32_sigreturn_args /* {
|
|
const struct freebsd4_freebsd32_ucontext *sigcntxp;
|
|
} */ *uap;
|
|
{
|
|
struct ia32_ucontext4 uc;
|
|
struct proc *p = td->td_proc;
|
|
struct trapframe *regs;
|
|
const struct ia32_ucontext4 *ucp;
|
|
int cs, eflags, error;
|
|
ksiginfo_t ksi;
|
|
|
|
error = copyin(uap->sigcntxp, &uc, sizeof(uc));
|
|
if (error != 0)
|
|
return (error);
|
|
ucp = &uc;
|
|
regs = td->td_frame;
|
|
eflags = ucp->uc_mcontext.mc_eflags;
|
|
/*
|
|
* Don't allow users to change privileged or reserved flags.
|
|
*/
|
|
/*
|
|
* XXX do allow users to change the privileged flag PSL_RF.
|
|
* The cpu sets PSL_RF in tf_eflags for faults. Debuggers
|
|
* should sometimes set it there too. tf_eflags is kept in
|
|
* the signal context during signal handling and there is no
|
|
* other place to remember it, so the PSL_RF bit may be
|
|
* corrupted by the signal handler without us knowing.
|
|
* Corruption of the PSL_RF bit at worst causes one more or
|
|
* one less debugger trap, so allowing it is fairly harmless.
|
|
*/
|
|
if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
|
|
printf("freebsd4_freebsd32_sigreturn: eflags = 0x%x\n", eflags);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Don't allow users to load a valid privileged %cs. Let the
|
|
* hardware check for invalid selectors, excess privilege in
|
|
* other selectors, invalid %eip's and invalid %esp's.
|
|
*/
|
|
cs = ucp->uc_mcontext.mc_cs;
|
|
if (!CS_SECURE(cs)) {
|
|
printf("freebsd4_sigreturn: cs = 0x%x\n", cs);
|
|
ksiginfo_init_trap(&ksi);
|
|
ksi.ksi_signo = SIGBUS;
|
|
ksi.ksi_code = BUS_OBJERR;
|
|
ksi.ksi_trapno = T_PROTFLT;
|
|
ksi.ksi_addr = (void *)regs->tf_rip;
|
|
trapsignal(td, &ksi);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* Segment selectors restored by sigtramp.S */
|
|
regs->tf_rdi = ucp->uc_mcontext.mc_edi;
|
|
regs->tf_rsi = ucp->uc_mcontext.mc_esi;
|
|
regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
|
|
regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
|
|
regs->tf_rdx = ucp->uc_mcontext.mc_edx;
|
|
regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
|
|
regs->tf_rax = ucp->uc_mcontext.mc_eax;
|
|
regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
|
|
regs->tf_err = ucp->uc_mcontext.mc_err;
|
|
regs->tf_rip = ucp->uc_mcontext.mc_eip;
|
|
regs->tf_cs = cs;
|
|
regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
|
|
regs->tf_rsp = ucp->uc_mcontext.mc_esp;
|
|
regs->tf_ss = ucp->uc_mcontext.mc_ss;
|
|
|
|
PROC_LOCK(p);
|
|
td->td_sigmask = ucp->uc_sigmask;
|
|
SIG_CANTMASK(td->td_sigmask);
|
|
signotify(td);
|
|
PROC_UNLOCK(p);
|
|
return (EJUSTRETURN);
|
|
}
|
|
#endif /* COMPAT_FREEBSD4 */
|
|
|
|
/*
|
|
* MPSAFE
|
|
*/
|
|
int
|
|
freebsd32_sigreturn(td, uap)
|
|
struct thread *td;
|
|
struct freebsd32_sigreturn_args /* {
|
|
const struct freebsd32_ucontext *sigcntxp;
|
|
} */ *uap;
|
|
{
|
|
struct ia32_ucontext uc;
|
|
struct proc *p = td->td_proc;
|
|
struct trapframe *regs;
|
|
const struct ia32_ucontext *ucp;
|
|
int cs, eflags, error, ret;
|
|
ksiginfo_t ksi;
|
|
|
|
error = copyin(uap->sigcntxp, &uc, sizeof(uc));
|
|
if (error != 0)
|
|
return (error);
|
|
ucp = &uc;
|
|
regs = td->td_frame;
|
|
eflags = ucp->uc_mcontext.mc_eflags;
|
|
/*
|
|
* Don't allow users to change privileged or reserved flags.
|
|
*/
|
|
/*
|
|
* XXX do allow users to change the privileged flag PSL_RF.
|
|
* The cpu sets PSL_RF in tf_eflags for faults. Debuggers
|
|
* should sometimes set it there too. tf_eflags is kept in
|
|
* the signal context during signal handling and there is no
|
|
* other place to remember it, so the PSL_RF bit may be
|
|
* corrupted by the signal handler without us knowing.
|
|
* Corruption of the PSL_RF bit at worst causes one more or
|
|
* one less debugger trap, so allowing it is fairly harmless.
|
|
*/
|
|
if (!EFL_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF)) {
|
|
printf("freebsd32_sigreturn: eflags = 0x%x\n", eflags);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Don't allow users to load a valid privileged %cs. Let the
|
|
* hardware check for invalid selectors, excess privilege in
|
|
* other selectors, invalid %eip's and invalid %esp's.
|
|
*/
|
|
cs = ucp->uc_mcontext.mc_cs;
|
|
if (!CS_SECURE(cs)) {
|
|
printf("sigreturn: cs = 0x%x\n", cs);
|
|
ksiginfo_init_trap(&ksi);
|
|
ksi.ksi_signo = SIGBUS;
|
|
ksi.ksi_code = BUS_OBJERR;
|
|
ksi.ksi_trapno = T_PROTFLT;
|
|
ksi.ksi_addr = (void *)regs->tf_rip;
|
|
trapsignal(td, &ksi);
|
|
return (EINVAL);
|
|
}
|
|
|
|
ret = ia32_set_fpcontext(td, &ucp->uc_mcontext);
|
|
if (ret != 0)
|
|
return (ret);
|
|
|
|
/* Segment selectors restored by sigtramp.S */
|
|
regs->tf_rdi = ucp->uc_mcontext.mc_edi;
|
|
regs->tf_rsi = ucp->uc_mcontext.mc_esi;
|
|
regs->tf_rbp = ucp->uc_mcontext.mc_ebp;
|
|
regs->tf_rbx = ucp->uc_mcontext.mc_ebx;
|
|
regs->tf_rdx = ucp->uc_mcontext.mc_edx;
|
|
regs->tf_rcx = ucp->uc_mcontext.mc_ecx;
|
|
regs->tf_rax = ucp->uc_mcontext.mc_eax;
|
|
regs->tf_trapno = ucp->uc_mcontext.mc_trapno;
|
|
regs->tf_err = ucp->uc_mcontext.mc_err;
|
|
regs->tf_rip = ucp->uc_mcontext.mc_eip;
|
|
regs->tf_cs = cs;
|
|
regs->tf_rflags = ucp->uc_mcontext.mc_eflags;
|
|
regs->tf_rsp = ucp->uc_mcontext.mc_esp;
|
|
regs->tf_ss = ucp->uc_mcontext.mc_ss;
|
|
|
|
PROC_LOCK(p);
|
|
td->td_sigmask = ucp->uc_sigmask;
|
|
SIG_CANTMASK(td->td_sigmask);
|
|
signotify(td);
|
|
PROC_UNLOCK(p);
|
|
return (EJUSTRETURN);
|
|
}
|
|
|
|
/*
|
|
* Clear registers on exec
|
|
*/
|
|
void
|
|
ia32_setregs(td, entry, stack, ps_strings)
|
|
struct thread *td;
|
|
u_long entry;
|
|
u_long stack;
|
|
u_long ps_strings;
|
|
{
|
|
struct trapframe *regs = td->td_frame;
|
|
struct pcb *pcb = td->td_pcb;
|
|
|
|
wrmsr(MSR_FSBASE, 0);
|
|
wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */
|
|
pcb->pcb_fsbase = 0;
|
|
pcb->pcb_gsbase = 0;
|
|
load_ds(_udatasel);
|
|
load_es(_udatasel);
|
|
load_fs(_udatasel);
|
|
load_gs(_udatasel);
|
|
pcb->pcb_ds = _udatasel;
|
|
pcb->pcb_es = _udatasel;
|
|
pcb->pcb_fs = _udatasel;
|
|
pcb->pcb_gs = _udatasel;
|
|
|
|
bzero((char *)regs, sizeof(struct trapframe));
|
|
regs->tf_rip = entry;
|
|
regs->tf_rsp = stack;
|
|
regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
|
|
regs->tf_ss = _udatasel;
|
|
regs->tf_cs = _ucode32sel;
|
|
regs->tf_rbx = ps_strings;
|
|
load_cr0(rcr0() | CR0_MP | CR0_TS);
|
|
fpstate_drop(td);
|
|
|
|
/* Return via doreti so that we can change to a different %cs */
|
|
pcb->pcb_flags |= PCB_FULLCTX;
|
|
td->td_retval[1] = 0;
|
|
}
|
|
|
|
void
|
|
siginfo_to_ia32siginfo(siginfo_t *src, struct ia32_siginfo *dst)
|
|
{
|
|
dst->si_signo = src->si_signo;
|
|
dst->si_errno = src->si_errno;
|
|
dst->si_code = src->si_code;
|
|
dst->si_pid = src->si_pid;
|
|
dst->si_uid = src->si_uid;
|
|
dst->si_status = src->si_status;
|
|
dst->si_addr = dst->si_addr;
|
|
dst->si_value.sigval_int = src->si_value.sigval_int;
|
|
dst->si_band = src->si_band;
|
|
dst->__spare__[0] = src->si_trapno;
|
|
}
|