mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-09-21 15:52:39 +02:00
3fde275167
This is in preparation for annotating copyin() and related functions with __result_use_check. Reviewed by: olce, dchagin MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D43104
909 lines
26 KiB
C
909 lines
26 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 1994-1996 Søren Schmidt
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#define __ELF_WORD_SIZE 32
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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/imgact_aout.h>
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#include <sys/imgact_elf.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/module.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/stddef.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/sysproto.h>
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#include <vm/pmap.h>
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#include <vm/vm.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <machine/cpu.h>
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#include <machine/cputypes.h>
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#include <machine/md_var.h>
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#include <machine/pcb.h>
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#include <machine/trap.h>
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#include <x86/linux/linux_x86.h>
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#include <i386/linux/linux.h>
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#include <i386/linux/linux_proto.h>
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#include <compat/linux/linux_elf.h>
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#include <compat/linux/linux_emul.h>
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#include <compat/linux/linux_fork.h>
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#include <compat/linux/linux_ioctl.h>
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#include <compat/linux/linux_mib.h>
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#include <compat/linux/linux_misc.h>
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#include <compat/linux/linux_signal.h>
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#include <compat/linux/linux_util.h>
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#include <compat/linux/linux_vdso.h>
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#include <x86/linux/linux_x86_sigframe.h>
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MODULE_VERSION(linux, 1);
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#define LINUX_VDSOPAGE_SIZE PAGE_SIZE * 2
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#define LINUX_VDSOPAGE (VM_MAXUSER_ADDRESS - LINUX_VDSOPAGE_SIZE)
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#define LINUX_SHAREDPAGE (LINUX_VDSOPAGE - PAGE_SIZE)
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/*
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* PAGE_SIZE - the size
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* of the native SHAREDPAGE
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*/
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#define LINUX_USRSTACK LINUX_SHAREDPAGE
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#define LINUX_PS_STRINGS (LINUX_USRSTACK - sizeof(struct ps_strings))
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static int linux_szsigcode;
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static vm_object_t linux_vdso_obj;
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static char *linux_vdso_mapping;
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extern char _binary_linux_vdso_so_o_start;
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extern char _binary_linux_vdso_so_o_end;
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static vm_offset_t linux_vdso_base;
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extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
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extern const char *linux_syscallnames[];
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SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
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static int linux_fixup(uintptr_t *stack_base,
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struct image_params *iparams);
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static void linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
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static void linux_exec_setregs(struct thread *td,
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struct image_params *imgp, uintptr_t stack);
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static void linux_exec_sysvec_init(void *param);
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static int linux_on_exec_vmspace(struct proc *p,
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struct image_params *imgp);
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static void linux_set_fork_retval(struct thread *td);
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static void linux_vdso_install(const void *param);
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static void linux_vdso_deinstall(const void *param);
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static void linux_vdso_reloc(char *mapping, Elf_Addr offset);
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LINUX_VDSO_SYM_CHAR(linux_platform);
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LINUX_VDSO_SYM_INTPTR(__kernel_vsyscall);
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LINUX_VDSO_SYM_INTPTR(linux_vdso_sigcode);
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LINUX_VDSO_SYM_INTPTR(linux_vdso_rt_sigcode);
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LINUX_VDSO_SYM_INTPTR(kern_timekeep_base);
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LINUX_VDSO_SYM_INTPTR(kern_tsc_selector);
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LINUX_VDSO_SYM_INTPTR(kern_cpu_selector);
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static int
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linux_fixup(uintptr_t *stack_base, struct image_params *imgp)
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{
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register_t *base, *argv, *envp;
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base = (register_t *)*stack_base;
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argv = base;
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envp = base + (imgp->args->argc + 1);
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base--;
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if (suword(base, (intptr_t)envp) != 0)
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return (EFAULT);
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base--;
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if (suword(base, (intptr_t)argv) != 0)
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return (EFAULT);
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base--;
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if (suword(base, imgp->args->argc) != 0)
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return (EFAULT);
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*stack_base = (uintptr_t)base;
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return (0);
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}
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void
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linux32_arch_copyout_auxargs(struct image_params *imgp, Elf_Auxinfo **pos)
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{
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AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
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AUXARGS_ENTRY((*pos), LINUX_AT_SYSINFO, __kernel_vsyscall);
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AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP, cpu_feature);
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AUXARGS_ENTRY((*pos), LINUX_AT_HWCAP2, linux_x86_elf_hwcap2());
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AUXARGS_ENTRY((*pos), LINUX_AT_PLATFORM, PTROUT(linux_platform));
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}
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static void
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linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
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{
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struct thread *td = curthread;
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struct proc *p = td->td_proc;
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struct sigacts *psp;
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struct trapframe *regs;
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struct l_rt_sigframe *fp, frame;
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int sig, code;
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int oonstack;
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sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno);
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code = ksi->ksi_code;
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PROC_LOCK_ASSERT(p, MA_OWNED);
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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_esp);
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/* Allocate space for the signal handler context. */
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if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
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SIGISMEMBER(psp->ps_sigonstack, sig)) {
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fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
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td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
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} else
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fp = (struct l_rt_sigframe *)regs->tf_esp - 1;
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mtx_unlock(&psp->ps_mtx);
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/* Build the argument list for the signal handler. */
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sig = bsd_to_linux_signal(sig);
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bzero(&frame, sizeof(frame));
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frame.sf_sig = sig;
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frame.sf_siginfo = PTROUT(&fp->sf_si);
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frame.sf_ucontext = PTROUT(&fp->sf_uc);
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/* Fill in POSIX parts. */
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siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig);
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/* Build the signal context to be used by sigreturn. */
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frame.sf_uc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
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frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
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frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
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? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
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PROC_UNLOCK(p);
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bsd_to_linux_sigset(mask, &frame.sf_uc.uc_sigmask);
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frame.sf_uc.uc_mcontext.sc_mask = frame.sf_uc.uc_sigmask.__mask;
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frame.sf_uc.uc_mcontext.sc_gs = rgs();
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frame.sf_uc.uc_mcontext.sc_fs = regs->tf_fs;
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frame.sf_uc.uc_mcontext.sc_es = regs->tf_es;
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frame.sf_uc.uc_mcontext.sc_ds = regs->tf_ds;
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frame.sf_uc.uc_mcontext.sc_edi = regs->tf_edi;
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frame.sf_uc.uc_mcontext.sc_esi = regs->tf_esi;
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frame.sf_uc.uc_mcontext.sc_ebp = regs->tf_ebp;
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frame.sf_uc.uc_mcontext.sc_ebx = regs->tf_ebx;
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frame.sf_uc.uc_mcontext.sc_esp = regs->tf_esp;
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frame.sf_uc.uc_mcontext.sc_edx = regs->tf_edx;
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frame.sf_uc.uc_mcontext.sc_ecx = regs->tf_ecx;
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frame.sf_uc.uc_mcontext.sc_eax = regs->tf_eax;
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frame.sf_uc.uc_mcontext.sc_eip = regs->tf_eip;
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frame.sf_uc.uc_mcontext.sc_cs = regs->tf_cs;
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frame.sf_uc.uc_mcontext.sc_eflags = regs->tf_eflags;
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frame.sf_uc.uc_mcontext.sc_esp_at_signal = regs->tf_esp;
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frame.sf_uc.uc_mcontext.sc_ss = regs->tf_ss;
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frame.sf_uc.uc_mcontext.sc_err = regs->tf_err;
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frame.sf_uc.uc_mcontext.sc_cr2 = (register_t)ksi->ksi_addr;
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frame.sf_uc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
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if (copyout(&frame, fp, sizeof(frame)) != 0) {
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/*
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* Process has trashed its stack; give it an illegal
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* instruction to halt it in its tracks.
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*/
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PROC_LOCK(p);
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sigexit(td, SIGILL);
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}
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/* Build context to run handler in. */
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regs->tf_esp = PTROUT(fp);
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regs->tf_eip = linux_vdso_rt_sigcode;
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regs->tf_edi = PTROUT(catcher);
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regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
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regs->tf_cs = _ucodesel;
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regs->tf_ds = _udatasel;
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regs->tf_es = _udatasel;
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regs->tf_fs = _udatasel;
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regs->tf_ss = _udatasel;
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PROC_LOCK(p);
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mtx_lock(&psp->ps_mtx);
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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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* in u. 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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static void
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linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
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{
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struct thread *td = curthread;
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struct proc *p = td->td_proc;
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struct sigacts *psp;
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struct trapframe *regs;
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struct l_sigframe *fp, frame;
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l_sigset_t lmask;
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int sig;
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int oonstack;
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PROC_LOCK_ASSERT(p, MA_OWNED);
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psp = p->p_sigacts;
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sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno);
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mtx_assert(&psp->ps_mtx, MA_OWNED);
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if (SIGISMEMBER(psp->ps_siginfo, sig)) {
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/* Signal handler installed with SA_SIGINFO. */
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linux_rt_sendsig(catcher, ksi, mask);
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return;
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}
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regs = td->td_frame;
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oonstack = sigonstack(regs->tf_esp);
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/* Allocate space for the signal handler context. */
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if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
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SIGISMEMBER(psp->ps_sigonstack, sig)) {
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fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
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td->td_sigstk.ss_size - sizeof(struct l_sigframe));
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} else
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fp = (struct l_sigframe *)regs->tf_esp - 1;
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mtx_unlock(&psp->ps_mtx);
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PROC_UNLOCK(p);
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/* Build the argument list for the signal handler. */
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sig = bsd_to_linux_signal(sig);
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bzero(&frame, sizeof(frame));
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frame.sf_sig = sig;
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frame.sf_sigmask = *mask;
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bsd_to_linux_sigset(mask, &lmask);
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/* Build the signal context to be used by sigreturn. */
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frame.sf_sc.sc_mask = lmask.__mask;
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frame.sf_sc.sc_gs = rgs();
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frame.sf_sc.sc_fs = regs->tf_fs;
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frame.sf_sc.sc_es = regs->tf_es;
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frame.sf_sc.sc_ds = regs->tf_ds;
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frame.sf_sc.sc_edi = regs->tf_edi;
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frame.sf_sc.sc_esi = regs->tf_esi;
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frame.sf_sc.sc_ebp = regs->tf_ebp;
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frame.sf_sc.sc_ebx = regs->tf_ebx;
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frame.sf_sc.sc_esp = regs->tf_esp;
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frame.sf_sc.sc_edx = regs->tf_edx;
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frame.sf_sc.sc_ecx = regs->tf_ecx;
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frame.sf_sc.sc_eax = regs->tf_eax;
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frame.sf_sc.sc_eip = regs->tf_eip;
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frame.sf_sc.sc_cs = regs->tf_cs;
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frame.sf_sc.sc_eflags = regs->tf_eflags;
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frame.sf_sc.sc_esp_at_signal = regs->tf_esp;
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frame.sf_sc.sc_ss = regs->tf_ss;
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frame.sf_sc.sc_err = regs->tf_err;
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frame.sf_sc.sc_cr2 = (register_t)ksi->ksi_addr;
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frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(ksi->ksi_trapno);
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if (copyout(&frame, fp, sizeof(frame)) != 0) {
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/*
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* Process has trashed its stack; give it an illegal
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* instruction to halt it in its tracks.
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*/
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PROC_LOCK(p);
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sigexit(td, SIGILL);
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}
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/* Build context to run handler in. */
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regs->tf_esp = PTROUT(fp);
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regs->tf_eip = linux_vdso_sigcode;
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regs->tf_edi = PTROUT(catcher);
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regs->tf_eflags &= ~(PSL_T | PSL_VM | PSL_D);
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regs->tf_cs = _ucodesel;
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regs->tf_ds = _udatasel;
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regs->tf_es = _udatasel;
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regs->tf_fs = _udatasel;
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regs->tf_ss = _udatasel;
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PROC_LOCK(p);
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mtx_lock(&psp->ps_mtx);
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}
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/*
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* System call to cleanup state after a signal
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* has been taken. Reset signal mask and
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* stack state from context left by sendsig (above).
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* Return to previous pc and psl as specified by
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* context left by sendsig. Check carefully to
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* make sure that the user has not modified the
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* psl to gain improper privileges or to cause
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* a machine fault.
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*/
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int
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linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
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{
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struct l_sigframe frame;
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struct trapframe *regs;
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int eflags;
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ksiginfo_t ksi;
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regs = td->td_frame;
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/*
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* The trampoline code hands us the sigframe.
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* It is unsafe to keep track of it ourselves, in the event that a
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* program jumps out of a signal handler.
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*/
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if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
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return (EFAULT);
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/* Check for security violations. */
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#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
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eflags = frame.sf_sc.sc_eflags;
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if (!EFLAGS_SECURE(eflags, regs->tf_eflags))
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return (EINVAL);
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/*
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* Don't allow users to load a valid privileged %cs. Let the
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* hardware check for invalid selectors, excess privilege in
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* other selectors, invalid %eip's and invalid %esp's.
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*/
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#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
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if (!CS_SECURE(frame.sf_sc.sc_cs)) {
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ksiginfo_init_trap(&ksi);
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ksi.ksi_signo = SIGBUS;
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ksi.ksi_code = BUS_OBJERR;
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ksi.ksi_trapno = T_PROTFLT;
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ksi.ksi_addr = (void *)regs->tf_eip;
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trapsignal(td, &ksi);
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return (EINVAL);
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}
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kern_sigprocmask(td, SIG_SETMASK, &frame.sf_sigmask, NULL, 0);
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/* Restore signal context. */
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/* %gs was restored by the trampoline. */
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regs->tf_fs = frame.sf_sc.sc_fs;
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regs->tf_es = frame.sf_sc.sc_es;
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regs->tf_ds = frame.sf_sc.sc_ds;
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regs->tf_edi = frame.sf_sc.sc_edi;
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regs->tf_esi = frame.sf_sc.sc_esi;
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regs->tf_ebp = frame.sf_sc.sc_ebp;
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regs->tf_ebx = frame.sf_sc.sc_ebx;
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regs->tf_edx = frame.sf_sc.sc_edx;
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regs->tf_ecx = frame.sf_sc.sc_ecx;
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regs->tf_eax = frame.sf_sc.sc_eax;
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regs->tf_eip = frame.sf_sc.sc_eip;
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regs->tf_cs = frame.sf_sc.sc_cs;
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regs->tf_eflags = eflags;
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regs->tf_esp = frame.sf_sc.sc_esp_at_signal;
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regs->tf_ss = frame.sf_sc.sc_ss;
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return (EJUSTRETURN);
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}
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/*
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* System call to cleanup state after a signal
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* has been taken. Reset signal mask and
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|
* stack state from context left by rt_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
|
|
* psl to gain improper privileges or to cause
|
|
* a machine fault.
|
|
*/
|
|
int
|
|
linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
|
|
{
|
|
struct l_ucontext uc;
|
|
struct l_sigcontext *context;
|
|
sigset_t bmask;
|
|
l_stack_t *lss;
|
|
stack_t ss;
|
|
struct trapframe *regs;
|
|
int eflags;
|
|
ksiginfo_t ksi;
|
|
|
|
regs = td->td_frame;
|
|
|
|
/*
|
|
* The trampoline code hands us the ucontext.
|
|
* It is unsafe to keep track of it ourselves, in the event that a
|
|
* program jumps out of a signal handler.
|
|
*/
|
|
if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
|
|
return (EFAULT);
|
|
|
|
context = &uc.uc_mcontext;
|
|
|
|
/* Check for security violations. */
|
|
#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
|
|
eflags = context->sc_eflags;
|
|
if (!EFLAGS_SECURE(eflags, regs->tf_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.
|
|
*/
|
|
#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
|
|
if (!CS_SECURE(context->sc_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_eip;
|
|
trapsignal(td, &ksi);
|
|
return (EINVAL);
|
|
}
|
|
|
|
linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
|
|
kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
|
|
|
|
/* Restore signal context. */
|
|
/* %gs was restored by the trampoline. */
|
|
regs->tf_fs = context->sc_fs;
|
|
regs->tf_es = context->sc_es;
|
|
regs->tf_ds = context->sc_ds;
|
|
regs->tf_edi = context->sc_edi;
|
|
regs->tf_esi = context->sc_esi;
|
|
regs->tf_ebp = context->sc_ebp;
|
|
regs->tf_ebx = context->sc_ebx;
|
|
regs->tf_edx = context->sc_edx;
|
|
regs->tf_ecx = context->sc_ecx;
|
|
regs->tf_eax = context->sc_eax;
|
|
regs->tf_eip = context->sc_eip;
|
|
regs->tf_cs = context->sc_cs;
|
|
regs->tf_eflags = eflags;
|
|
regs->tf_esp = context->sc_esp_at_signal;
|
|
regs->tf_ss = context->sc_ss;
|
|
|
|
/* Call sigaltstack & ignore results. */
|
|
lss = &uc.uc_stack;
|
|
ss.ss_sp = PTRIN(lss->ss_sp);
|
|
ss.ss_size = lss->ss_size;
|
|
ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
|
|
|
|
(void)kern_sigaltstack(td, &ss, NULL);
|
|
|
|
return (EJUSTRETURN);
|
|
}
|
|
|
|
static int
|
|
linux_fetch_syscall_args(struct thread *td)
|
|
{
|
|
struct proc *p;
|
|
struct trapframe *frame;
|
|
struct syscall_args *sa;
|
|
|
|
p = td->td_proc;
|
|
frame = td->td_frame;
|
|
sa = &td->td_sa;
|
|
|
|
sa->code = frame->tf_eax;
|
|
sa->original_code = sa->code;
|
|
sa->args[0] = frame->tf_ebx;
|
|
sa->args[1] = frame->tf_ecx;
|
|
sa->args[2] = frame->tf_edx;
|
|
sa->args[3] = frame->tf_esi;
|
|
sa->args[4] = frame->tf_edi;
|
|
sa->args[5] = frame->tf_ebp;
|
|
|
|
if (sa->code >= p->p_sysent->sv_size)
|
|
/* nosys */
|
|
sa->callp = &nosys_sysent;
|
|
else
|
|
sa->callp = &p->p_sysent->sv_table[sa->code];
|
|
|
|
td->td_retval[0] = 0;
|
|
td->td_retval[1] = frame->tf_edx;
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
linux_set_syscall_retval(struct thread *td, int error)
|
|
{
|
|
struct trapframe *frame = td->td_frame;
|
|
|
|
cpu_set_syscall_retval(td, error);
|
|
|
|
if (__predict_false(error != 0)) {
|
|
if (error != ERESTART && error != EJUSTRETURN)
|
|
frame->tf_eax = bsd_to_linux_errno(error);
|
|
}
|
|
}
|
|
|
|
static void
|
|
linux_set_fork_retval(struct thread *td)
|
|
{
|
|
struct trapframe *frame = td->td_frame;
|
|
|
|
frame->tf_eax = 0;
|
|
}
|
|
|
|
/*
|
|
* exec_setregs may initialize some registers differently than Linux
|
|
* does, thus potentially confusing Linux binaries. If necessary, we
|
|
* override the exec_setregs default(s) here.
|
|
*/
|
|
static void
|
|
linux_exec_setregs(struct thread *td, struct image_params *imgp,
|
|
uintptr_t stack)
|
|
{
|
|
struct pcb *pcb = td->td_pcb;
|
|
|
|
exec_setregs(td, imgp, stack);
|
|
|
|
/* Linux sets %gs to 0, we default to _udatasel. */
|
|
pcb->pcb_gs = 0;
|
|
load_gs(0);
|
|
|
|
pcb->pcb_initial_npxcw = __LINUX_NPXCW__;
|
|
}
|
|
|
|
struct sysentvec linux_sysvec = {
|
|
.sv_size = LINUX_SYS_MAXSYSCALL,
|
|
.sv_table = linux_sysent,
|
|
.sv_fixup = linux_fixup,
|
|
.sv_sendsig = linux_sendsig,
|
|
.sv_sigcode = &_binary_linux_vdso_so_o_start,
|
|
.sv_szsigcode = &linux_szsigcode,
|
|
.sv_name = "Linux a.out",
|
|
.sv_coredump = NULL,
|
|
.sv_minsigstksz = LINUX_MINSIGSTKSZ,
|
|
.sv_minuser = VM_MIN_ADDRESS,
|
|
.sv_maxuser = VM_MAXUSER_ADDRESS,
|
|
.sv_usrstack = LINUX_USRSTACK,
|
|
.sv_psstrings = PS_STRINGS,
|
|
.sv_psstringssz = sizeof(struct ps_strings),
|
|
.sv_stackprot = VM_PROT_ALL,
|
|
.sv_copyout_strings = exec_copyout_strings,
|
|
.sv_setregs = linux_exec_setregs,
|
|
.sv_fixlimit = NULL,
|
|
.sv_maxssiz = NULL,
|
|
.sv_flags = SV_ABI_LINUX | SV_AOUT | SV_IA32 | SV_ILP32 |
|
|
SV_SIG_DISCIGN | SV_SIG_WAITNDQ,
|
|
.sv_set_syscall_retval = linux_set_syscall_retval,
|
|
.sv_fetch_syscall_args = linux_fetch_syscall_args,
|
|
.sv_syscallnames = linux_syscallnames,
|
|
.sv_schedtail = linux_schedtail,
|
|
.sv_thread_detach = linux_thread_detach,
|
|
.sv_trap = NULL,
|
|
.sv_hwcap = NULL,
|
|
.sv_hwcap2 = NULL,
|
|
.sv_onexec = linux_on_exec_vmspace,
|
|
.sv_onexit = linux_on_exit,
|
|
.sv_ontdexit = linux_thread_dtor,
|
|
.sv_setid_allowed = &linux_setid_allowed_query,
|
|
.sv_set_fork_retval = linux_set_fork_retval,
|
|
};
|
|
INIT_SYSENTVEC(aout_sysvec, &linux_sysvec);
|
|
|
|
struct sysentvec elf_linux_sysvec = {
|
|
.sv_size = LINUX_SYS_MAXSYSCALL,
|
|
.sv_table = linux_sysent,
|
|
.sv_fixup = __elfN(freebsd_fixup),
|
|
.sv_sendsig = linux_sendsig,
|
|
.sv_sigcode = &_binary_linux_vdso_so_o_start,
|
|
.sv_szsigcode = &linux_szsigcode,
|
|
.sv_name = "Linux ELF32",
|
|
.sv_coredump = elf32_coredump,
|
|
.sv_elf_core_osabi = ELFOSABI_NONE,
|
|
.sv_elf_core_abi_vendor = LINUX_ABI_VENDOR,
|
|
.sv_elf_core_prepare_notes = __linuxN(prepare_notes),
|
|
.sv_minsigstksz = LINUX_MINSIGSTKSZ,
|
|
.sv_minuser = VM_MIN_ADDRESS,
|
|
.sv_maxuser = VM_MAXUSER_ADDRESS,
|
|
.sv_usrstack = LINUX_USRSTACK,
|
|
.sv_psstrings = LINUX_PS_STRINGS,
|
|
.sv_psstringssz = sizeof(struct ps_strings),
|
|
.sv_stackprot = VM_PROT_ALL,
|
|
.sv_copyout_auxargs = __linuxN(copyout_auxargs),
|
|
.sv_copyout_strings = __linuxN(copyout_strings),
|
|
.sv_setregs = linux_exec_setregs,
|
|
.sv_fixlimit = NULL,
|
|
.sv_maxssiz = NULL,
|
|
.sv_flags = SV_ABI_LINUX | SV_IA32 | SV_ILP32 | SV_SHP |
|
|
SV_SIG_DISCIGN | SV_SIG_WAITNDQ | SV_TIMEKEEP,
|
|
.sv_set_syscall_retval = linux_set_syscall_retval,
|
|
.sv_fetch_syscall_args = linux_fetch_syscall_args,
|
|
.sv_syscallnames = NULL,
|
|
.sv_shared_page_base = LINUX_SHAREDPAGE,
|
|
.sv_shared_page_len = PAGE_SIZE,
|
|
.sv_schedtail = linux_schedtail,
|
|
.sv_thread_detach = linux_thread_detach,
|
|
.sv_trap = NULL,
|
|
.sv_hwcap = NULL,
|
|
.sv_hwcap2 = NULL,
|
|
.sv_onexec = linux_on_exec_vmspace,
|
|
.sv_onexit = linux_on_exit,
|
|
.sv_ontdexit = linux_thread_dtor,
|
|
.sv_setid_allowed = &linux_setid_allowed_query,
|
|
.sv_set_fork_retval = linux_set_fork_retval,
|
|
};
|
|
|
|
static int
|
|
linux_on_exec_vmspace(struct proc *p, struct image_params *imgp)
|
|
{
|
|
int error = 0;
|
|
|
|
if (SV_PROC_FLAG(p, SV_SHP) != 0)
|
|
error = linux_map_vdso(p, linux_vdso_obj,
|
|
linux_vdso_base, LINUX_VDSOPAGE_SIZE, imgp);
|
|
if (error == 0)
|
|
error = linux_on_exec(p, imgp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* linux_vdso_install() and linux_exec_sysvec_init() must be called
|
|
* after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY).
|
|
*/
|
|
static void
|
|
linux_exec_sysvec_init(void *param)
|
|
{
|
|
l_uintptr_t *ktimekeep_base, *ktsc_selector;
|
|
struct sysentvec *sv;
|
|
ptrdiff_t tkoff;
|
|
|
|
sv = param;
|
|
/* Fill timekeep_base */
|
|
exec_sysvec_init(sv);
|
|
|
|
tkoff = kern_timekeep_base - linux_vdso_base;
|
|
ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff);
|
|
*ktimekeep_base = sv->sv_shared_page_base + sv->sv_timekeep_offset;
|
|
|
|
tkoff = kern_tsc_selector - linux_vdso_base;
|
|
ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff);
|
|
*ktsc_selector = linux_vdso_tsc_selector_idx();
|
|
if (bootverbose)
|
|
printf("Linux i386 vDSO tsc_selector: %u\n", *ktsc_selector);
|
|
|
|
tkoff = kern_cpu_selector - linux_vdso_base;
|
|
ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff);
|
|
*ktsc_selector = linux_vdso_cpu_selector_idx();
|
|
if (bootverbose)
|
|
printf("Linux i386 vDSO cpu_selector: %u\n", *ktsc_selector);
|
|
}
|
|
SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY,
|
|
linux_exec_sysvec_init, &elf_linux_sysvec);
|
|
|
|
static void
|
|
linux_vdso_install(const void *param)
|
|
{
|
|
char *vdso_start = &_binary_linux_vdso_so_o_start;
|
|
char *vdso_end = &_binary_linux_vdso_so_o_end;
|
|
|
|
linux_szsigcode = vdso_end - vdso_start;
|
|
MPASS(linux_szsigcode <= LINUX_VDSOPAGE_SIZE);
|
|
|
|
linux_vdso_base = LINUX_VDSOPAGE;
|
|
|
|
__elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base);
|
|
|
|
linux_vdso_obj = __elfN(linux_shared_page_init)
|
|
(&linux_vdso_mapping, LINUX_VDSOPAGE_SIZE);
|
|
bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode);
|
|
|
|
linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base);
|
|
}
|
|
SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST,
|
|
linux_vdso_install, NULL);
|
|
|
|
static void
|
|
linux_vdso_deinstall(const void *param)
|
|
{
|
|
|
|
__elfN(linux_shared_page_fini)(linux_vdso_obj,
|
|
linux_vdso_mapping, LINUX_VDSOPAGE_SIZE);
|
|
}
|
|
SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
|
|
linux_vdso_deinstall, NULL);
|
|
|
|
static void
|
|
linux_vdso_reloc(char *mapping, Elf_Addr offset)
|
|
{
|
|
const Elf_Shdr *shdr;
|
|
const Elf_Rel *rel;
|
|
const Elf_Ehdr *ehdr;
|
|
Elf_Addr *where;
|
|
Elf_Size rtype, symidx;
|
|
Elf_Addr addr, addend;
|
|
int i, relcnt;
|
|
|
|
MPASS(offset != 0);
|
|
|
|
relcnt = 0;
|
|
ehdr = (const Elf_Ehdr *)mapping;
|
|
shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff);
|
|
for (i = 0; i < ehdr->e_shnum; i++)
|
|
{
|
|
switch (shdr[i].sh_type) {
|
|
case SHT_REL:
|
|
rel = (const Elf_Rel *)(mapping + shdr[i].sh_offset);
|
|
relcnt = shdr[i].sh_size / sizeof(*rel);
|
|
break;
|
|
case SHT_RELA:
|
|
printf("Linux i386 vDSO: unexpected Rela section\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < relcnt; i++, rel++) {
|
|
where = (Elf_Addr *)(mapping + rel->r_offset);
|
|
addend = *where;
|
|
rtype = ELF_R_TYPE(rel->r_info);
|
|
symidx = ELF_R_SYM(rel->r_info);
|
|
|
|
switch (rtype) {
|
|
case R_386_NONE: /* none */
|
|
break;
|
|
|
|
case R_386_RELATIVE: /* B + A */
|
|
addr = (Elf_Addr)PTROUT(offset + addend);
|
|
if (*where != addr)
|
|
*where = addr;
|
|
break;
|
|
|
|
case R_386_IRELATIVE:
|
|
printf("Linux i386 vDSO: unexpected ifunc relocation, "
|
|
"symbol index %d\n", symidx);
|
|
break;
|
|
default:
|
|
printf("Linux i386 vDSO: unexpected relocation type %d, "
|
|
"symbol index %d\n", rtype, symidx);
|
|
}
|
|
}
|
|
}
|
|
|
|
static Elf_Brandnote linux_brandnote = {
|
|
.hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
|
|
.hdr.n_descsz = 16, /* XXX at least 16 */
|
|
.hdr.n_type = 1,
|
|
.vendor = GNU_ABI_VENDOR,
|
|
.flags = BN_TRANSLATE_OSREL,
|
|
.trans_osrel = linux_trans_osrel
|
|
};
|
|
|
|
static Elf32_Brandinfo linux_brand = {
|
|
.brand = ELFOSABI_LINUX,
|
|
.machine = EM_386,
|
|
.compat_3_brand = "Linux",
|
|
.interp_path = "/lib/ld-linux.so.1",
|
|
.sysvec = &elf_linux_sysvec,
|
|
.interp_newpath = NULL,
|
|
.brand_note = &linux_brandnote,
|
|
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
|
|
};
|
|
|
|
static Elf32_Brandinfo linux_glibc2brand = {
|
|
.brand = ELFOSABI_LINUX,
|
|
.machine = EM_386,
|
|
.compat_3_brand = "Linux",
|
|
.interp_path = "/lib/ld-linux.so.2",
|
|
.sysvec = &elf_linux_sysvec,
|
|
.interp_newpath = NULL,
|
|
.brand_note = &linux_brandnote,
|
|
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
|
|
};
|
|
|
|
static Elf32_Brandinfo linux_muslbrand = {
|
|
.brand = ELFOSABI_LINUX,
|
|
.machine = EM_386,
|
|
.compat_3_brand = "Linux",
|
|
.interp_path = "/lib/ld-musl-i386.so.1",
|
|
.sysvec = &elf_linux_sysvec,
|
|
.interp_newpath = NULL,
|
|
.brand_note = &linux_brandnote,
|
|
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE |
|
|
LINUX_BI_FUTEX_REQUEUE
|
|
};
|
|
|
|
Elf32_Brandinfo *linux_brandlist[] = {
|
|
&linux_brand,
|
|
&linux_glibc2brand,
|
|
&linux_muslbrand,
|
|
NULL
|
|
};
|
|
|
|
static int
|
|
linux_elf_modevent(module_t mod, int type, void *data)
|
|
{
|
|
Elf32_Brandinfo **brandinfo;
|
|
int error;
|
|
struct linux_ioctl_handler **lihp;
|
|
|
|
error = 0;
|
|
|
|
switch(type) {
|
|
case MOD_LOAD:
|
|
for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
|
|
++brandinfo)
|
|
if (elf32_insert_brand_entry(*brandinfo) < 0)
|
|
error = EINVAL;
|
|
if (error == 0) {
|
|
SET_FOREACH(lihp, linux_ioctl_handler_set)
|
|
linux_ioctl_register_handler(*lihp);
|
|
linux_dev_shm_create();
|
|
linux_osd_jail_register();
|
|
linux_netlink_register();
|
|
stclohz = (stathz ? stathz : hz);
|
|
if (bootverbose)
|
|
printf("Linux ELF exec handler installed\n");
|
|
} else
|
|
printf("cannot insert Linux ELF brand handler\n");
|
|
break;
|
|
case MOD_UNLOAD:
|
|
for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
|
|
++brandinfo)
|
|
if (elf32_brand_inuse(*brandinfo))
|
|
error = EBUSY;
|
|
if (error == 0) {
|
|
for (brandinfo = &linux_brandlist[0];
|
|
*brandinfo != NULL; ++brandinfo)
|
|
if (elf32_remove_brand_entry(*brandinfo) < 0)
|
|
error = EINVAL;
|
|
}
|
|
if (error == 0) {
|
|
SET_FOREACH(lihp, linux_ioctl_handler_set)
|
|
linux_ioctl_unregister_handler(*lihp);
|
|
linux_netlink_deregister();
|
|
linux_dev_shm_destroy();
|
|
linux_osd_jail_deregister();
|
|
if (bootverbose)
|
|
printf("Linux ELF exec handler removed\n");
|
|
} else
|
|
printf("Could not deinstall ELF interpreter entry\n");
|
|
break;
|
|
default:
|
|
return (EOPNOTSUPP);
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static moduledata_t linux_elf_mod = {
|
|
"linuxelf",
|
|
linux_elf_modevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
|
|
MODULE_DEPEND(linuxelf, netlink, 1, 1, 1);
|
|
FEATURE(linux, "Linux 32bit support");
|