/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2000 Marcel Moolenaar * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* needed for pcb definition in linux_set_thread_area */ #include "opt_posix.h" extern struct sysentvec elf32_freebsd_sysvec; /* defined in i386/i386/elf_machdep.c */ struct l_descriptor { l_uint entry_number; l_ulong base_addr; l_uint limit; l_uint seg_32bit:1; l_uint contents:2; l_uint read_exec_only:1; l_uint limit_in_pages:1; l_uint seg_not_present:1; l_uint useable:1; }; struct l_old_select_argv { l_int nfds; l_fd_set *readfds; l_fd_set *writefds; l_fd_set *exceptfds; struct l_timeval *timeout; }; int linux_execve(struct thread *td, struct linux_execve_args *args) { struct image_args eargs; char *newpath; int error; if (!LUSECONVPATH(td)) { error = exec_copyin_args(&eargs, args->path, UIO_USERSPACE, args->argp, args->envp); } else { LCONVPATHEXIST(td, args->path, &newpath); error = exec_copyin_args(&eargs, newpath, UIO_SYSSPACE, args->argp, args->envp); LFREEPATH(newpath); } if (error == 0) error = linux_common_execve(td, &eargs); return (error); } struct l_ipc_kludge { struct l_msgbuf *msgp; l_long msgtyp; }; int linux_ipc(struct thread *td, struct linux_ipc_args *args) { switch (args->what & 0xFFFF) { case LINUX_SEMOP: { struct linux_semop_args a; a.semid = args->arg1; a.tsops = PTRIN(args->ptr); a.nsops = args->arg2; return (linux_semop(td, &a)); } case LINUX_SEMGET: { struct linux_semget_args a; a.key = args->arg1; a.nsems = args->arg2; a.semflg = args->arg3; return (linux_semget(td, &a)); } case LINUX_SEMCTL: { struct linux_semctl_args a; int error; a.semid = args->arg1; a.semnum = args->arg2; a.cmd = args->arg3; error = copyin(PTRIN(args->ptr), &a.arg, sizeof(a.arg)); if (error) return (error); return (linux_semctl(td, &a)); } case LINUX_MSGSND: { struct linux_msgsnd_args a; a.msqid = args->arg1; a.msgp = PTRIN(args->ptr); a.msgsz = args->arg2; a.msgflg = args->arg3; return (linux_msgsnd(td, &a)); } case LINUX_MSGRCV: { struct linux_msgrcv_args a; a.msqid = args->arg1; a.msgsz = args->arg2; a.msgflg = args->arg3; if ((args->what >> 16) == 0) { struct l_ipc_kludge tmp; int error; if (args->ptr == 0) return (EINVAL); error = copyin(PTRIN(args->ptr), &tmp, sizeof(tmp)); if (error) return (error); a.msgp = PTRIN(tmp.msgp); a.msgtyp = tmp.msgtyp; } else { a.msgp = PTRIN(args->ptr); a.msgtyp = args->arg5; } return (linux_msgrcv(td, &a)); } case LINUX_MSGGET: { struct linux_msgget_args a; a.key = args->arg1; a.msgflg = args->arg2; return (linux_msgget(td, &a)); } case LINUX_MSGCTL: { struct linux_msgctl_args a; a.msqid = args->arg1; a.cmd = args->arg2; a.buf = PTRIN(args->ptr); return (linux_msgctl(td, &a)); } case LINUX_SHMAT: { struct linux_shmat_args a; l_uintptr_t addr; int error; a.shmid = args->arg1; a.shmaddr = PTRIN(args->ptr); a.shmflg = args->arg2; error = linux_shmat(td, &a); if (error != 0) return (error); addr = td->td_retval[0]; error = copyout(&addr, PTRIN(args->arg3), sizeof(addr)); td->td_retval[0] = 0; return (error); } case LINUX_SHMDT: { struct linux_shmdt_args a; a.shmaddr = PTRIN(args->ptr); return (linux_shmdt(td, &a)); } case LINUX_SHMGET: { struct linux_shmget_args a; a.key = args->arg1; a.size = args->arg2; a.shmflg = args->arg3; return (linux_shmget(td, &a)); } case LINUX_SHMCTL: { struct linux_shmctl_args a; a.shmid = args->arg1; a.cmd = args->arg2; a.buf = PTRIN(args->ptr); return (linux_shmctl(td, &a)); } default: break; } return (EINVAL); } int linux_old_select(struct thread *td, struct linux_old_select_args *args) { struct l_old_select_argv linux_args; struct linux_select_args newsel; int error; error = copyin(args->ptr, &linux_args, sizeof(linux_args)); if (error) return (error); newsel.nfds = linux_args.nfds; newsel.readfds = linux_args.readfds; newsel.writefds = linux_args.writefds; newsel.exceptfds = linux_args.exceptfds; newsel.timeout = linux_args.timeout; return (linux_select(td, &newsel)); } int linux_set_cloned_tls(struct thread *td, void *desc) { struct segment_descriptor sd; struct l_user_desc info; int idx, error; int a[2]; error = copyin(desc, &info, sizeof(struct l_user_desc)); if (error) { linux_msg(td, "set_cloned_tls copyin failed!"); } else { idx = info.entry_number; /* * looks like we're getting the idx we returned * in the set_thread_area() syscall */ if (idx != 6 && idx != 3) { linux_msg(td, "set_cloned_tls resetting idx!"); idx = 3; } /* this doesnt happen in practice */ if (idx == 6) { /* we might copy out the entry_number as 3 */ info.entry_number = 3; error = copyout(&info, desc, sizeof(struct l_user_desc)); if (error) linux_msg(td, "set_cloned_tls copyout failed!"); } a[0] = LINUX_LDT_entry_a(&info); a[1] = LINUX_LDT_entry_b(&info); memcpy(&sd, &a, sizeof(a)); /* set %gs */ td->td_pcb->pcb_gsd = sd; td->td_pcb->pcb_gs = GSEL(GUGS_SEL, SEL_UPL); } return (error); } int linux_set_upcall_kse(struct thread *td, register_t stack) { if (stack) td->td_frame->tf_esp = stack; /* * The newly created Linux thread returns * to the user space by the same path that a parent do. */ td->td_frame->tf_eax = 0; return (0); } int linux_mmap2(struct thread *td, struct linux_mmap2_args *args) { return (linux_mmap_common(td, args->addr, args->len, args->prot, args->flags, args->fd, (uint64_t)(uint32_t)args->pgoff * PAGE_SIZE)); } int linux_mmap(struct thread *td, struct linux_mmap_args *args) { int error; struct l_mmap_argv linux_args; error = copyin(args->ptr, &linux_args, sizeof(linux_args)); if (error) return (error); return (linux_mmap_common(td, linux_args.addr, linux_args.len, linux_args.prot, linux_args.flags, linux_args.fd, (uint32_t)linux_args.pgoff)); } int linux_mprotect(struct thread *td, struct linux_mprotect_args *uap) { return (linux_mprotect_common(td, PTROUT(uap->addr), uap->len, uap->prot)); } int linux_madvise(struct thread *td, struct linux_madvise_args *uap) { return (linux_madvise_common(td, PTROUT(uap->addr), uap->len, uap->behav)); } int linux_ioperm(struct thread *td, struct linux_ioperm_args *args) { int error; struct i386_ioperm_args iia; iia.start = args->start; iia.length = args->length; iia.enable = args->enable; error = i386_set_ioperm(td, &iia); return (error); } int linux_iopl(struct thread *td, struct linux_iopl_args *args) { int error; if (args->level < 0 || args->level > 3) return (EINVAL); if ((error = priv_check(td, PRIV_IO)) != 0) return (error); if ((error = securelevel_gt(td->td_ucred, 0)) != 0) return (error); td->td_frame->tf_eflags = (td->td_frame->tf_eflags & ~PSL_IOPL) | (args->level * (PSL_IOPL / 3)); return (0); } int linux_modify_ldt(struct thread *td, struct linux_modify_ldt_args *uap) { int error; struct i386_ldt_args ldt; struct l_descriptor ld; union descriptor desc; int size, written; switch (uap->func) { case 0x00: /* read_ldt */ ldt.start = 0; ldt.descs = uap->ptr; ldt.num = uap->bytecount / sizeof(union descriptor); error = i386_get_ldt(td, &ldt); td->td_retval[0] *= sizeof(union descriptor); break; case 0x02: /* read_default_ldt = 0 */ size = 5*sizeof(struct l_desc_struct); if (size > uap->bytecount) size = uap->bytecount; for (written = error = 0; written < size && error == 0; written++) error = subyte((char *)uap->ptr + written, 0); td->td_retval[0] = written; break; case 0x01: /* write_ldt */ case 0x11: /* write_ldt */ if (uap->bytecount != sizeof(ld)) return (EINVAL); error = copyin(uap->ptr, &ld, sizeof(ld)); if (error) return (error); ldt.start = ld.entry_number; ldt.descs = &desc; ldt.num = 1; desc.sd.sd_lolimit = (ld.limit & 0x0000ffff); desc.sd.sd_hilimit = (ld.limit & 0x000f0000) >> 16; desc.sd.sd_lobase = (ld.base_addr & 0x00ffffff); desc.sd.sd_hibase = (ld.base_addr & 0xff000000) >> 24; desc.sd.sd_type = SDT_MEMRO | ((ld.read_exec_only ^ 1) << 1) | (ld.contents << 2); desc.sd.sd_dpl = 3; desc.sd.sd_p = (ld.seg_not_present ^ 1); desc.sd.sd_xx = 0; desc.sd.sd_def32 = ld.seg_32bit; desc.sd.sd_gran = ld.limit_in_pages; error = i386_set_ldt(td, &ldt, &desc); break; default: error = ENOSYS; break; } if (error == EOPNOTSUPP) { linux_msg(td, "modify_ldt needs kernel option USER_LDT"); error = ENOSYS; } return (error); } int linux_sigaction(struct thread *td, struct linux_sigaction_args *args) { l_osigaction_t osa; l_sigaction_t act, oact; int error; if (args->nsa != NULL) { error = copyin(args->nsa, &osa, sizeof(l_osigaction_t)); if (error) return (error); act.lsa_handler = osa.lsa_handler; act.lsa_flags = osa.lsa_flags; act.lsa_restorer = osa.lsa_restorer; LINUX_SIGEMPTYSET(act.lsa_mask); act.lsa_mask.__mask = osa.lsa_mask; } error = linux_do_sigaction(td, args->sig, args->nsa ? &act : NULL, args->osa ? &oact : NULL); if (args->osa != NULL && !error) { osa.lsa_handler = oact.lsa_handler; osa.lsa_flags = oact.lsa_flags; osa.lsa_restorer = oact.lsa_restorer; osa.lsa_mask = oact.lsa_mask.__mask; error = copyout(&osa, args->osa, sizeof(l_osigaction_t)); } return (error); } /* * Linux has two extra args, restart and oldmask. We dont use these, * but it seems that "restart" is actually a context pointer that * enables the signal to happen with a different register set. */ int linux_sigsuspend(struct thread *td, struct linux_sigsuspend_args *args) { sigset_t sigmask; l_sigset_t mask; LINUX_SIGEMPTYSET(mask); mask.__mask = args->mask; linux_to_bsd_sigset(&mask, &sigmask); return (kern_sigsuspend(td, sigmask)); } int linux_rt_sigsuspend(struct thread *td, struct linux_rt_sigsuspend_args *uap) { l_sigset_t lmask; sigset_t sigmask; int error; if (uap->sigsetsize != sizeof(l_sigset_t)) return (EINVAL); error = copyin(uap->newset, &lmask, sizeof(l_sigset_t)); if (error) return (error); linux_to_bsd_sigset(&lmask, &sigmask); return (kern_sigsuspend(td, sigmask)); } int linux_pause(struct thread *td, struct linux_pause_args *args) { struct proc *p = td->td_proc; sigset_t sigmask; PROC_LOCK(p); sigmask = td->td_sigmask; PROC_UNLOCK(p); return (kern_sigsuspend(td, sigmask)); } int linux_sigaltstack(struct thread *td, struct linux_sigaltstack_args *uap) { stack_t ss, oss; l_stack_t lss; int error; if (uap->uss != NULL) { error = copyin(uap->uss, &lss, sizeof(l_stack_t)); if (error) return (error); ss.ss_sp = lss.ss_sp; ss.ss_size = lss.ss_size; ss.ss_flags = linux_to_bsd_sigaltstack(lss.ss_flags); } error = kern_sigaltstack(td, (uap->uss != NULL) ? &ss : NULL, (uap->uoss != NULL) ? &oss : NULL); if (!error && uap->uoss != NULL) { lss.ss_sp = oss.ss_sp; lss.ss_size = oss.ss_size; lss.ss_flags = bsd_to_linux_sigaltstack(oss.ss_flags); error = copyout(&lss, uap->uoss, sizeof(l_stack_t)); } return (error); } int linux_set_thread_area(struct thread *td, struct linux_set_thread_area_args *args) { struct l_user_desc info; int error; int idx; int a[2]; struct segment_descriptor sd; error = copyin(args->desc, &info, sizeof(struct l_user_desc)); if (error) return (error); idx = info.entry_number; /* * Semantics of Linux version: every thread in the system has array of * 3 tls descriptors. 1st is GLIBC TLS, 2nd is WINE, 3rd unknown. This * syscall loads one of the selected tls decriptors with a value and * also loads GDT descriptors 6, 7 and 8 with the content of the * per-thread descriptors. * * Semantics of FreeBSD version: I think we can ignore that Linux has 3 * per-thread descriptors and use just the 1st one. The tls_array[] * is used only in set/get-thread_area() syscalls and for loading the * GDT descriptors. In FreeBSD we use just one GDT descriptor for TLS * so we will load just one. * * XXX: this doesn't work when a user space process tries to use more * than 1 TLS segment. Comment in the Linux sources says wine might do * this. */ /* * we support just GLIBC TLS now * we should let 3 proceed as well because we use this segment so * if code does two subsequent calls it should succeed */ if (idx != 6 && idx != -1 && idx != 3) return (EINVAL); /* * we have to copy out the GDT entry we use * FreeBSD uses GDT entry #3 for storing %gs so load that * * XXX: what if a user space program doesn't check this value and tries * to use 6, 7 or 8? */ idx = info.entry_number = 3; error = copyout(&info, args->desc, sizeof(struct l_user_desc)); if (error) return (error); if (LINUX_LDT_empty(&info)) { a[0] = 0; a[1] = 0; } else { a[0] = LINUX_LDT_entry_a(&info); a[1] = LINUX_LDT_entry_b(&info); } memcpy(&sd, &a, sizeof(a)); /* this is taken from i386 version of cpu_set_user_tls() */ critical_enter(); /* set %gs */ td->td_pcb->pcb_gsd = sd; PCPU_GET(fsgs_gdt)[1] = sd; load_gs(GSEL(GUGS_SEL, SEL_UPL)); critical_exit(); return (0); } int linux_get_thread_area(struct thread *td, struct linux_get_thread_area_args *args) { struct l_user_desc info; int error; int idx; struct l_desc_struct desc; struct segment_descriptor sd; error = copyin(args->desc, &info, sizeof(struct l_user_desc)); if (error) return (error); idx = info.entry_number; /* XXX: I am not sure if we want 3 to be allowed too. */ if (idx != 6 && idx != 3) return (EINVAL); idx = 3; memset(&info, 0, sizeof(info)); sd = PCPU_GET(fsgs_gdt)[1]; memcpy(&desc, &sd, sizeof(desc)); info.entry_number = idx; info.base_addr = LINUX_GET_BASE(&desc); info.limit = LINUX_GET_LIMIT(&desc); info.seg_32bit = LINUX_GET_32BIT(&desc); info.contents = LINUX_GET_CONTENTS(&desc); info.read_exec_only = !LINUX_GET_WRITABLE(&desc); info.limit_in_pages = LINUX_GET_LIMIT_PAGES(&desc); info.seg_not_present = !LINUX_GET_PRESENT(&desc); info.useable = LINUX_GET_USEABLE(&desc); error = copyout(&info, args->desc, sizeof(struct l_user_desc)); if (error) return (EFAULT); return (0); } /* XXX: this wont work with module - convert it */ int linux_mq_open(struct thread *td, struct linux_mq_open_args *args) { #ifdef P1003_1B_MQUEUE return (sys_kmq_open(td, (struct kmq_open_args *)args)); #else return (ENOSYS); #endif } int linux_mq_unlink(struct thread *td, struct linux_mq_unlink_args *args) { #ifdef P1003_1B_MQUEUE return (sys_kmq_unlink(td, (struct kmq_unlink_args *)args)); #else return (ENOSYS); #endif } int linux_mq_timedsend(struct thread *td, struct linux_mq_timedsend_args *args) { #ifdef P1003_1B_MQUEUE return (sys_kmq_timedsend(td, (struct kmq_timedsend_args *)args)); #else return (ENOSYS); #endif } int linux_mq_timedreceive(struct thread *td, struct linux_mq_timedreceive_args *args) { #ifdef P1003_1B_MQUEUE return (sys_kmq_timedreceive(td, (struct kmq_timedreceive_args *)args)); #else return (ENOSYS); #endif } int linux_mq_notify(struct thread *td, struct linux_mq_notify_args *args) { #ifdef P1003_1B_MQUEUE return (sys_kmq_notify(td, (struct kmq_notify_args *)args)); #else return (ENOSYS); #endif } int linux_mq_getsetattr(struct thread *td, struct linux_mq_getsetattr_args *args) { #ifdef P1003_1B_MQUEUE return (sys_kmq_setattr(td, (struct kmq_setattr_args *)args)); #else return (ENOSYS); #endif }