/* $NetBSD: linux32_exec_elf32.c,v 1.7 2007/04/22 08:29:57 dsl Exp $ */ /*- * Copyright (c) 1995, 1998, 2000, 2001,2006 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, Eric Haszlakiewicz and * Emmanuel Dreyfus. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * 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. */ #include __KERNEL_RCSID(0, "$NetBSD: linux32_exec_elf32.c,v 1.7 2007/04/22 08:29:57 dsl Exp $"); #define ELFSIZE 32 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef DEBUG_LINUX #define DPRINTF(a) uprintf a #else #define DPRINTF(a) #endif int linux32_copyinargs(struct exec_package *, struct ps_strings *, void *, size_t, const void *, const void *); int ELFNAME2(linux32,probe)(l, epp, eh, itp, pos) struct lwp *l; struct exec_package *epp; void *eh; char *itp; vaddr_t *pos; { int error; if (((error = ELFNAME2(linux,signature)(l, epp, eh, itp)) != 0) && #ifdef LINUX32_GCC_SIGNATURE ((error = ELFNAME2(linux,gcc_signature)(l, epp, eh)) != 0) && #endif #ifdef LINUX32_ATEXIT_SIGNATURE ((error = ELFNAME2(linux,atexit_signature)(l, epp, eh)) != 0) && #endif #ifdef LINUX32_DEBUGLINK_SIGNATURE ((error = ELFNAME2(linux,debuglink_signature)(l, epp, eh)) != 0) && #endif 1) return error; if (itp) { if ((error = emul_find_interp(l, epp, itp))) return (error); } #if 0 DPRINTF(("linux32_probe: returning 0\n")); #endif epp->ep_flags |= EXEC_32; epp->ep_vm_minaddr = VM_MIN_ADDRESS; epp->ep_vm_maxaddr = USRSTACK32; return 0; } /* round up and down to page boundaries. */ #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) /* * Copy arguments onto the stack in the normal way, but add some * extra information in case of dynamic binding. */ int linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack, struct ps_strings *arginfo, char **stackp, void *argp) { struct linux32_extra_stack_data *esdp, esd; struct elf_args *ap; struct vattr *vap; Elf_Ehdr *eh; Elf_Phdr *ph; Elf_Addr phdr = 0; u_long phsize; int error; int i; if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) return error; /* * Push extra arguments on the stack needed by dynamically * linked binaries and static binaries as well. */ memset(&esd, 0, sizeof(esd)); esdp = (struct linux32_extra_stack_data *)(*stackp); ap = (struct elf_args *)pack->ep_emul_arg; vap = pack->ep_vap; eh = (Elf_Ehdr *)pack->ep_hdr; /* * We forgot this, so we ned to reload it now. XXX keep track of it? */ if (ap == NULL) { phsize = eh->e_phnum * sizeof(Elf_Phdr); ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); error = exec_read_from(l, pack->ep_vp, eh->e_phoff, ph, phsize); if (error != 0) { for (i = 0; i < eh->e_phnum; i++) { if (ph[i].p_type == PT_PHDR) { phdr = ph[i].p_vaddr; break; } } } free(ph, M_TEMP); } /* * The exec_package doesn't have a proc pointer and it's not * exactly trivial to add one since the credentials are * changing. XXX Linux uses curlwp's credentials. * Why can't we use them too? XXXad we do now; what's different * about Linux's LWP creds? */ i = 0; esd.ai[i].a_type = LINUX_AT_SYSINFO; esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->kernel_vsyscall[0]); esd.ai[i].a_type = LINUX_AT_SYSINFO_EHDR; esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->elfhdr); esd.ai[i].a_type = LINUX_AT_HWCAP; esd.ai[i++].a_v = LINUX32_CPUCAP; esd.ai[i].a_type = AT_PAGESZ; esd.ai[i++].a_v = PAGE_SIZE; esd.ai[i].a_type = LINUX_AT_CLKTCK; esd.ai[i++].a_v = hz; esd.ai[i].a_type = AT_PHDR; esd.ai[i++].a_v = (ap ? ap->arg_phaddr: phdr); esd.ai[i].a_type = AT_PHENT; esd.ai[i++].a_v = (ap ? ap->arg_phentsize : eh->e_phentsize); esd.ai[i].a_type = AT_PHNUM; esd.ai[i++].a_v = (ap ? ap->arg_phnum : eh->e_phnum); esd.ai[i].a_type = AT_BASE; esd.ai[i++].a_v = (ap ? ap->arg_interp : 0); esd.ai[i].a_type = AT_FLAGS; esd.ai[i++].a_v = 0; esd.ai[i].a_type = AT_ENTRY; esd.ai[i++].a_v = (ap ? ap->arg_entry : eh->e_entry); esd.ai[i].a_type = LINUX_AT_EGID; esd.ai[i++].a_v = ((vap->va_mode & S_ISGID) ? vap->va_gid : kauth_cred_getegid(l->l_cred)); esd.ai[i].a_type = LINUX_AT_GID; esd.ai[i++].a_v = kauth_cred_getgid(l->l_cred); esd.ai[i].a_type = LINUX_AT_EUID; esd.ai[i++].a_v = ((vap->va_mode & S_ISUID) ? vap->va_uid : kauth_cred_geteuid(l->l_cred)); esd.ai[i].a_type = LINUX_AT_UID; esd.ai[i++].a_v = kauth_cred_getuid(l->l_cred); esd.ai[i].a_type = LINUX_AT_SECURE; esd.ai[i++].a_v = 0; esd.ai[i].a_type = LINUX_AT_PLATFORM; esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->hw_platform[0]); esd.ai[i].a_type = AT_NULL; esd.ai[i++].a_v = 0; #ifdef DEBUG_LINUX if (i != LINUX32_ELF_AUX_ENTRIES) { printf("linux32_elf32_copyargs: %d Aux entries\n", i); return EINVAL; } #endif memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall, sizeof(linux32_kernel_vsyscall)); memcpy(&esd.elfhdr, eh, sizeof(*eh)); strcpy(esd.hw_platform, LINUX32_PLATFORM); if (ap) { free((char *)ap, M_TEMP); pack->ep_emul_arg = NULL; } /* * Copy out the ELF auxiliary table and hw platform name */ if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) return error; *stackp += sizeof(esd); return 0; }