a161fba992
Move futex_mtx to linux_common.ko for amd64 and aarch64 along with respective list/mutex init/destroy. PR: 240989 Reported by: Alex S <iwtcex@gmail.com>
535 lines
15 KiB
C
535 lines
15 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1994-1996 Søren Schmidt
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* Copyright (c) 2018 Turing Robotic Industries Inc.
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/cdefs.h>
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#include <sys/elf.h>
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#include <sys/exec.h>
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#include <sys/imgact.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/module.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/signalvar.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <vm/vm_param.h>
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#include <arm64/linux/linux.h>
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#include <arm64/linux/linux_proto.h>
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#include <compat/linux/linux_dtrace.h>
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#include <compat/linux/linux_emul.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_vdso.h>
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MODULE_VERSION(linux64elf, 1);
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const char *linux_kplatform;
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static int linux_szsigcode;
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static vm_object_t linux_shared_page_obj;
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static char *linux_shared_page_mapping;
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extern char _binary_linux_locore_o_start;
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extern char _binary_linux_locore_o_end;
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extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
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SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
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static register_t *linux_copyout_strings(struct image_params *imgp);
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static int linux_elf_fixup(register_t **stack_base,
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struct image_params *iparams);
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static bool linux_trans_osrel(const Elf_Note *note, int32_t *osrel);
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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_set_syscall_retval(struct thread *td, int error);
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static int linux_fetch_syscall_args(struct thread *td);
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static void linux_exec_setregs(struct thread *td, struct image_params *imgp,
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u_long stack);
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static int linux_vsyscall(struct thread *td);
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/* DTrace init */
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LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
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/* DTrace probes */
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LIN_SDT_PROBE_DEFINE2(sysvec, linux_translate_traps, todo, "int", "int");
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LIN_SDT_PROBE_DEFINE0(sysvec, linux_exec_setregs, todo);
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LIN_SDT_PROBE_DEFINE0(sysvec, linux_elf_fixup, todo);
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LIN_SDT_PROBE_DEFINE0(sysvec, linux_rt_sigreturn, todo);
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LIN_SDT_PROBE_DEFINE0(sysvec, linux_rt_sendsig, todo);
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LIN_SDT_PROBE_DEFINE0(sysvec, linux_vsyscall, todo);
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LIN_SDT_PROBE_DEFINE0(sysvec, linux_vdso_install, todo);
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LIN_SDT_PROBE_DEFINE0(sysvec, linux_vdso_deinstall, todo);
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/* LINUXTODO: do we have traps to translate? */
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static int
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linux_translate_traps(int signal, int trap_code)
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{
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LIN_SDT_PROBE2(sysvec, linux_translate_traps, todo, signal, trap_code);
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return (signal);
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}
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LINUX_VDSO_SYM_CHAR(linux_platform);
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static int
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linux_fetch_syscall_args(struct thread *td)
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{
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struct proc *p;
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struct syscall_args *sa;
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register_t *ap;
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p = td->td_proc;
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ap = td->td_frame->tf_x;
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sa = &td->td_sa;
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sa->code = td->td_frame->tf_x[8];
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/* LINUXTODO: generic syscall? */
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if (sa->code >= p->p_sysent->sv_size)
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sa->callp = &p->p_sysent->sv_table[0];
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else
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sa->callp = &p->p_sysent->sv_table[sa->code];
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sa->narg = sa->callp->sy_narg;
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if (sa->narg > 8)
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panic("ARM64TODO: Could we have more than 8 args?");
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memcpy(sa->args, ap, 8 * sizeof(register_t));
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td->td_retval[0] = 0;
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return (0);
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}
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static void
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linux_set_syscall_retval(struct thread *td, int error)
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{
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td->td_retval[1] = td->td_frame->tf_x[1];
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cpu_set_syscall_retval(td, error);
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}
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static int
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linux_elf_fixup(register_t **stack_base, struct image_params *imgp)
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{
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Elf_Auxargs *args;
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Elf_Auxinfo *argarray, *pos;
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Elf_Addr *auxbase, *base;
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struct ps_strings *arginfo;
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struct proc *p;
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int error, issetugid;
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LIN_SDT_PROBE0(sysvec, linux_elf_fixup, todo);
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p = imgp->proc;
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arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
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KASSERT(curthread->td_proc == imgp->proc,
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("unsafe linux_elf_fixup(), should be curproc"));
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base = (Elf64_Addr *)*stack_base;
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args = (Elf64_Auxargs *)imgp->auxargs;
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/* Auxargs after argc, and NULL-terminated argv and envv lists. */
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auxbase = base + 1 + imgp->args->argc + 1 + imgp->args->envc + 1;
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argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
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M_WAITOK | M_ZERO);
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issetugid = p->p_flag & P_SUGID ? 1 : 0;
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AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR,
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imgp->proc->p_sysent->sv_shared_page_base);
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#if 0 /* LINUXTODO: implement arm64 LINUX_AT_HWCAP */
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AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
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#endif
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AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
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AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
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AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
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AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
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AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
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AUXARGS_ENTRY(pos, AT_BASE, args->base);
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AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
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AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
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AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
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AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
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AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
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AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
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AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
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#if 0 /* LINUXTODO: implement arm64 LINUX_AT_PLATFORM */
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AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
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#endif
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AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, imgp->canary);
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if (imgp->execpathp != 0)
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AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, imgp->execpathp);
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if (args->execfd != -1)
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AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
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AUXARGS_ENTRY(pos, AT_NULL, 0);
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free(imgp->auxargs, M_TEMP);
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imgp->auxargs = NULL;
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KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
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error = copyout(argarray, auxbase, sizeof(*argarray) * LINUX_AT_COUNT);
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free(argarray, M_TEMP);
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if (error != 0)
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return (error);
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return (0);
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}
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/*
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* Copy strings out to the new process address space, constructing new arg
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* and env vector tables. Return a pointer to the base so that it can be used
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* as the initial stack pointer.
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* LINUXTODO: deduplicate against other linuxulator archs
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*/
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static register_t *
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linux_copyout_strings(struct image_params *imgp)
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{
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char **vectp;
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char *stringp, *destp;
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register_t *stack_base;
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struct ps_strings *arginfo;
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char canary[LINUX_AT_RANDOM_LEN];
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size_t execpath_len;
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struct proc *p;
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int argc, envc;
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/* Calculate string base and vector table pointers. */
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if (imgp->execpath != NULL && imgp->auxargs != NULL)
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execpath_len = strlen(imgp->execpath) + 1;
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else
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execpath_len = 0;
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p = imgp->proc;
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arginfo = (struct ps_strings *)p->p_sysent->sv_psstrings;
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destp = (caddr_t)arginfo - SPARE_USRSPACE -
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roundup(sizeof(canary), sizeof(char *)) -
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roundup(execpath_len, sizeof(char *)) -
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roundup(ARG_MAX - imgp->args->stringspace, sizeof(char *));
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if (execpath_len != 0) {
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imgp->execpathp = (uintptr_t)arginfo - execpath_len;
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copyout(imgp->execpath, (void *)imgp->execpathp, execpath_len);
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}
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/* Prepare the canary for SSP. */
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arc4rand(canary, sizeof(canary), 0);
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imgp->canary = (uintptr_t)arginfo -
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roundup(execpath_len, sizeof(char *)) -
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roundup(sizeof(canary), sizeof(char *));
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copyout(canary, (void *)imgp->canary, sizeof(canary));
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vectp = (char **)destp;
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if (imgp->auxargs) {
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/*
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* Allocate room on the stack for the ELF auxargs
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* array. It has up to LINUX_AT_COUNT entries.
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*/
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vectp -= howmany(LINUX_AT_COUNT * sizeof(Elf64_Auxinfo),
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sizeof(*vectp));
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}
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/*
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* Allocate room for argc and the argv[] and env vectors including the
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* terminating NULL pointers.
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*/
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vectp -= 1 + imgp->args->argc + 1 + imgp->args->envc + 1;
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vectp = (char **)STACKALIGN(vectp);
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/* vectp also becomes our initial stack base. */
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stack_base = (register_t *)vectp;
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stringp = imgp->args->begin_argv;
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argc = imgp->args->argc;
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envc = imgp->args->envc;
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/* Copy out strings - arguments and environment. */
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copyout(stringp, destp, ARG_MAX - imgp->args->stringspace);
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/* Fill in "ps_strings" struct for ps, w, etc. */
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suword(&arginfo->ps_argvstr, (long)(intptr_t)vectp);
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suword(&arginfo->ps_nargvstr, argc);
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suword(vectp++, argc);
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/* Fill in argument portion of vector table. */
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for (; argc > 0; --argc) {
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suword(vectp++, (long)(intptr_t)destp);
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while (*stringp++ != 0)
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destp++;
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destp++;
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}
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/* A null vector table pointer separates the argp's from the envp's. */
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suword(vectp++, 0);
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suword(&arginfo->ps_envstr, (long)(intptr_t)vectp);
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suword(&arginfo->ps_nenvstr, envc);
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/* Fill in environment portion of vector table. */
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for (; envc > 0; --envc) {
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suword(vectp++, (long)(intptr_t)destp);
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while (*stringp++ != 0)
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destp++;
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destp++;
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}
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/* The end of the vector table is a null pointer. */
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suword(vectp, 0);
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return (stack_base);
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}
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/*
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* Reset registers to default values on exec.
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*/
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static void
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linux_exec_setregs(struct thread *td, struct image_params *imgp, u_long stack)
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{
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struct trapframe *regs = td->td_frame;
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/* LINUXTODO: validate */
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LIN_SDT_PROBE0(sysvec, linux_exec_setregs, todo);
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memset(regs, 0, sizeof(*regs));
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/* glibc start.S registers function pointer in x0 with atexit. */
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regs->tf_sp = stack;
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#if 0 /* LINUXTODO: See if this is used. */
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regs->tf_lr = imgp->entry_addr;
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#else
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regs->tf_lr = 0xffffffffffffffff;
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#endif
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regs->tf_elr = imgp->entry_addr;
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}
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int
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linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
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{
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/* LINUXTODO: implement */
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LIN_SDT_PROBE0(sysvec, linux_rt_sigreturn, todo);
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return (EDOOFUS);
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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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/* LINUXTODO: implement */
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LIN_SDT_PROBE0(sysvec, linux_rt_sendsig, todo);
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}
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static int
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linux_vsyscall(struct thread *td)
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{
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/* LINUXTODO: implement */
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LIN_SDT_PROBE0(sysvec, linux_vsyscall, todo);
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return (EDOOFUS);
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}
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struct sysentvec elf_linux_sysvec = {
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.sv_size = LINUX_SYS_MAXSYSCALL,
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.sv_table = linux_sysent,
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.sv_errsize = ELAST + 1,
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.sv_errtbl = linux_errtbl,
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.sv_transtrap = linux_translate_traps,
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.sv_fixup = linux_elf_fixup,
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.sv_sendsig = linux_rt_sendsig,
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.sv_sigcode = &_binary_linux_locore_o_start,
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.sv_szsigcode = &linux_szsigcode,
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.sv_name = "Linux ELF64",
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.sv_coredump = elf64_coredump,
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.sv_imgact_try = linux_exec_imgact_try,
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.sv_minsigstksz = LINUX_MINSIGSTKSZ,
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.sv_minuser = VM_MIN_ADDRESS,
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.sv_maxuser = VM_MAXUSER_ADDRESS,
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.sv_usrstack = USRSTACK,
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.sv_psstrings = PS_STRINGS, /* XXX */
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.sv_stackprot = VM_PROT_ALL, /* XXX */
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.sv_copyout_strings = linux_copyout_strings,
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.sv_setregs = linux_exec_setregs,
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.sv_fixlimit = NULL,
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.sv_maxssiz = NULL,
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.sv_flags = SV_ABI_LINUX | SV_LP64 | SV_SHP,
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.sv_set_syscall_retval = linux_set_syscall_retval,
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.sv_fetch_syscall_args = linux_fetch_syscall_args,
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.sv_syscallnames = NULL,
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.sv_shared_page_base = SHAREDPAGE,
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.sv_shared_page_len = PAGE_SIZE,
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.sv_schedtail = linux_schedtail,
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.sv_thread_detach = linux_thread_detach,
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.sv_trap = linux_vsyscall,
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};
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static void
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linux_vdso_install(const void *param)
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{
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linux_szsigcode = (&_binary_linux_locore_o_end -
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&_binary_linux_locore_o_start);
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if (linux_szsigcode > elf_linux_sysvec.sv_shared_page_len)
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panic("invalid Linux VDSO size\n");
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__elfN(linux_vdso_fixup)(&elf_linux_sysvec);
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linux_shared_page_obj = __elfN(linux_shared_page_init)
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(&linux_shared_page_mapping);
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__elfN(linux_vdso_reloc)(&elf_linux_sysvec);
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memcpy(linux_shared_page_mapping, elf_linux_sysvec.sv_sigcode,
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linux_szsigcode);
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elf_linux_sysvec.sv_shared_page_obj = linux_shared_page_obj;
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printf("LINUXTODO: %s: fix linux_kplatform\n", __func__);
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#if 0
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linux_kplatform = linux_shared_page_mapping +
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(linux_platform - (caddr_t)elf_linux_sysvec.sv_shared_page_base);
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#else
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linux_kplatform = "arm64";
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#endif
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}
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SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC, SI_ORDER_ANY,
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linux_vdso_install, NULL);
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static void
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linux_vdso_deinstall(const void *param)
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{
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LIN_SDT_PROBE0(sysvec, linux_vdso_deinstall, todo);
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__elfN(linux_shared_page_fini)(linux_shared_page_obj);
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}
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SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
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linux_vdso_deinstall, NULL);
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static char GNU_ABI_VENDOR[] = "GNU";
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static int GNU_ABI_LINUX = 0;
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/* LINUXTODO: deduplicate */
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static bool
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linux_trans_osrel(const Elf_Note *note, int32_t *osrel)
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{
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const Elf32_Word *desc;
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uintptr_t p;
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p = (uintptr_t)(note + 1);
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p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
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desc = (const Elf32_Word *)p;
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if (desc[0] != GNU_ABI_LINUX)
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return (false);
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*osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]);
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return (true);
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}
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static Elf_Brandnote linux64_brandnote = {
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|
.hdr.n_namesz = sizeof(GNU_ABI_VENDOR),
|
|
.hdr.n_descsz = 16,
|
|
.hdr.n_type = 1,
|
|
.vendor = GNU_ABI_VENDOR,
|
|
.flags = BN_TRANSLATE_OSREL,
|
|
.trans_osrel = linux_trans_osrel
|
|
};
|
|
|
|
static Elf64_Brandinfo linux_glibc2brand = {
|
|
.brand = ELFOSABI_LINUX,
|
|
.machine = EM_AARCH64,
|
|
.compat_3_brand = "Linux",
|
|
.emul_path = "/compat/linux",
|
|
.interp_path = "/lib64/ld-linux-x86-64.so.2",
|
|
.sysvec = &elf_linux_sysvec,
|
|
.interp_newpath = NULL,
|
|
.brand_note = &linux64_brandnote,
|
|
.flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE
|
|
};
|
|
|
|
Elf64_Brandinfo *linux_brandlist[] = {
|
|
&linux_glibc2brand,
|
|
NULL
|
|
};
|
|
|
|
static int
|
|
linux64_elf_modevent(module_t mod, int type, void *data)
|
|
{
|
|
Elf64_Brandinfo **brandinfo;
|
|
struct linux_ioctl_handler**lihp;
|
|
int error;
|
|
|
|
error = 0;
|
|
switch(type) {
|
|
case MOD_LOAD:
|
|
for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
|
|
++brandinfo)
|
|
if (elf64_insert_brand_entry(*brandinfo) < 0)
|
|
error = EINVAL;
|
|
if (error == 0) {
|
|
SET_FOREACH(lihp, linux_ioctl_handler_set)
|
|
linux_ioctl_register_handler(*lihp);
|
|
stclohz = (stathz ? stathz : hz);
|
|
if (bootverbose)
|
|
printf("Linux arm64 ELF exec handler installed\n");
|
|
}
|
|
break;
|
|
case MOD_UNLOAD:
|
|
for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
|
|
++brandinfo)
|
|
if (elf64_brand_inuse(*brandinfo))
|
|
error = EBUSY;
|
|
if (error == 0) {
|
|
for (brandinfo = &linux_brandlist[0];
|
|
*brandinfo != NULL; ++brandinfo)
|
|
if (elf64_remove_brand_entry(*brandinfo) < 0)
|
|
error = EINVAL;
|
|
}
|
|
if (error == 0) {
|
|
SET_FOREACH(lihp, linux_ioctl_handler_set)
|
|
linux_ioctl_unregister_handler(*lihp);
|
|
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 linux64_elf_mod = {
|
|
"linux64elf",
|
|
linux64_elf_modevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE_TIED(linux64elf, linux64_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
|
|
MODULE_DEPEND(linux64elf, linux_common, 1, 1, 1);
|
|
FEATURE(linux64, "AArch64 Linux 64bit support");
|