/* $NetBSD: linux_exec_aout.c,v 1.68 2015/10/18 16:59:19 maxv Exp $ */ /*- * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Christos Zoulas, Frank van der Linden and Eric Haszlakiewicz. * * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * based on exec_aout.c, sunos_exec.c and svr4_exec.c */ #include __KERNEL_RCSID(0, "$NetBSD: linux_exec_aout.c,v 1.68 2015/10/18 16:59:19 maxv Exp $"); #ifdef _KERNEL_OPT #include "opt_execfmt.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include int linux_aout_copyargs(struct lwp *, struct exec_package *, struct ps_strings *, char **, void *); static int exec_linux_aout_prep_zmagic(struct lwp *, struct exec_package *); static int exec_linux_aout_prep_nmagic(struct lwp *, struct exec_package *); static int exec_linux_aout_prep_omagic(struct lwp *, struct exec_package *); static int exec_linux_aout_prep_qmagic(struct lwp *, struct exec_package *); int linux_aout_copyargs(struct lwp *l, struct exec_package *pack, struct ps_strings *arginfo, char **stackp, void *argp) { char **cpp = (char **)*stackp; char **stk = (char **)*stackp; char *dp, *sp; size_t len; void *nullp = NULL; int argc = arginfo->ps_nargvstr; int envc = arginfo->ps_nenvstr; int error; if ((error = copyout(&argc, cpp++, sizeof(argc))) != 0) return error; /* leave room for envp and argv */ cpp += 2; if ((error = copyout(&cpp, &stk[1], sizeof (cpp))) != 0) return error; dp = (char *) (cpp + argc + envc + 2); sp = argp; /* XXX don't copy them out, remap them! */ arginfo->ps_argvstr = cpp; /* remember location of argv for later */ for (; --argc >= 0; sp += len, dp += len) if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) return error; if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) return error; if ((error = copyout(&cpp, &stk[2], sizeof (cpp))) != 0) return error; arginfo->ps_envstr = cpp; /* remember location of envp for later */ for (; --envc >= 0; sp += len, dp += len) if ((error = copyout(&dp, cpp++, sizeof(dp))) != 0 || (error = copyoutstr(sp, dp, ARG_MAX, &len)) != 0) return error; if ((error = copyout(&nullp, cpp++, sizeof(nullp))) != 0) return error; *stackp = (char *)cpp; return 0; } int exec_linux_aout_makecmds(struct lwp *l, struct exec_package *epp) { struct exec *linux_ep = epp->ep_hdr; int machtype, magic; int error = ENOEXEC; if (epp->ep_hdrvalid < sizeof(struct exec)) return ENOEXEC; magic = LINUX_N_MAGIC(linux_ep); machtype = LINUX_N_MACHTYPE(linux_ep); if (machtype != LINUX_MID_MACHINE) return (ENOEXEC); switch (magic) { case QMAGIC: error = exec_linux_aout_prep_qmagic(l, epp); break; case ZMAGIC: error = exec_linux_aout_prep_zmagic(l, epp); break; case NMAGIC: error = exec_linux_aout_prep_nmagic(l, epp); break; case OMAGIC: error = exec_linux_aout_prep_omagic(l, epp); break; } return error; } /* * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400 * is very likely not page aligned on most architectures, it is treated * as an NMAGIC here. XXX */ static int exec_linux_aout_prep_zmagic(struct lwp *l, struct exec_package *epp) { struct exec *execp = epp->ep_hdr; epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC); epp->ep_tsize = execp->a_text; epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC); epp->ep_dsize = execp->a_data + execp->a_bss; epp->ep_entry = execp->a_entry; /* set up command for text segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC), VM_PROT_READ|VM_PROT_EXECUTE); /* set up command for data segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); /* set up command for bss segment */ if (execp->a_bss) NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, epp->ep_daddr + execp->a_data, NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); return (*epp->ep_esch->es_setup_stack)(l, epp); } /* * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package. * Not different from the normal stuff. */ static int exec_linux_aout_prep_nmagic(struct lwp *l, struct exec_package *epp) { struct exec *execp = epp->ep_hdr; long bsize, baddr; epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC); epp->ep_tsize = execp->a_text; epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC); epp->ep_dsize = execp->a_data + execp->a_bss; epp->ep_entry = execp->a_entry; /* set up command for text segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text, epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC), VM_PROT_READ|VM_PROT_EXECUTE); /* set up command for data segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data, epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); /* set up command for bss segment */ baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); bsize = epp->ep_daddr + epp->ep_dsize - baddr; if (bsize > 0) NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); return (*epp->ep_esch->es_setup_stack)(l, epp); } /* * exec_aout_prep_omagic(): Prepare Linux OMAGIC package. * Business as usual. */ static int exec_linux_aout_prep_omagic(struct lwp *l, struct exec_package *epp) { struct exec *execp = epp->ep_hdr; long dsize, bsize, baddr; epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC); epp->ep_tsize = execp->a_text; epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC); epp->ep_dsize = execp->a_data + execp->a_bss; epp->ep_entry = execp->a_entry; /* set up command for text and data segments */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); /* set up command for bss segment */ baddr = roundup(epp->ep_daddr + execp->a_data, PAGE_SIZE); bsize = epp->ep_daddr + epp->ep_dsize - baddr; if (bsize > 0) NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr, NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); /* * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize); * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize' * respectively to page boundaries. * Compensate `ep_dsize' for the amount of data covered by the last * text page. */ dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, PAGE_SIZE); epp->ep_dsize = (dsize > 0) ? dsize : 0; return (*epp->ep_esch->es_setup_stack)(l, epp); } static int exec_linux_aout_prep_qmagic(struct lwp *l, struct exec_package *epp) { struct exec *execp = epp->ep_hdr; int error; epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC); epp->ep_tsize = execp->a_text; epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC); epp->ep_dsize = execp->a_data + execp->a_bss; epp->ep_entry = execp->a_entry; error = vn_marktext(epp->ep_vp); if (error) return (error); /* set up command for text segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text, epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC), VM_PROT_READ|VM_PROT_EXECUTE); /* set up command for data segment */ NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data, epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); /* set up command for bss segment */ if (execp->a_bss) NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss, epp->ep_daddr + execp->a_data, NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE); return (*epp->ep_esch->es_setup_stack)(l, epp); }