/* $NetBSD: linux32_exec_elf32.c,v 1.19.20.1 2022/08/03 11:11:33 martin 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. * * 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 1.19.20.1 2022/08/03 11:11:33 martin Exp $"); #define ELFSIZE 32 #include #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)(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 | EXEC_FORCEAUX; epp->ep_vm_minaddr = exec_vm_minaddr(VM_MIN_ADDRESS); epp->ep_vm_maxaddr = USRSTACK32; return 0; } /* * 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) { Aux32Info ai[LINUX32_ELF_AUX_ENTRIES], *a; uint32_t randbytes[4]; struct elf_args *ap; struct vattr *vap; size_t len; int error; if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) return error; a = ai; memset(ai, 0, sizeof(ai)); /* * Push extra arguments on the stack needed by dynamically * linked binaries and static binaries as well. */ a->a_type = AT_PAGESZ; a->a_v = PAGE_SIZE; a++; if ((ap = (struct elf_args *)pack->ep_emul_arg)) { a->a_type = AT_PHDR; a->a_v = ap->arg_phaddr; a++; a->a_type = AT_PHENT; a->a_v = ap->arg_phentsize; a++; a->a_type = AT_PHNUM; a->a_v = ap->arg_phnum; a++; a->a_type = AT_BASE; a->a_v = ap->arg_interp; a++; a->a_type = AT_FLAGS; a->a_v = 0; a++; a->a_type = AT_ENTRY; a->a_v = ap->arg_entry; a++; exec_free_emul_arg(pack); } /* Linux-specific items */ a->a_type = LINUX_AT_CLKTCK; a->a_v = hz; a++; vap = pack->ep_vap; a->a_type = LINUX_AT_UID; a->a_v = kauth_cred_getuid(l->l_cred); a++; a->a_type = LINUX_AT_EUID; a->a_v = ((vap->va_mode & S_ISUID) ? vap->va_uid : kauth_cred_geteuid(l->l_cred)); a++; a->a_type = LINUX_AT_GID; a->a_v = kauth_cred_getgid(l->l_cred); a++; a->a_type = LINUX_AT_EGID; a->a_v = ((vap->va_mode & S_ISGID) ? vap->va_gid : kauth_cred_getegid(l->l_cred)); a++; a->a_type = LINUX_AT_SECURE; a->a_v = 0; a++; a->a_type = LINUX_AT_RANDOM; a->a_v = NETBSD32PTR32I(*stackp); a++; #if 0 /* XXX: increase LINUX32_ELF_AUX_ENTRIES if we enable those things */ a->a_type = LINUX_AT_SYSINFO; a->a_v = NETBSD32PTR32I(&esdp->kernel_vsyscall[0]); a++; a->a_type = LINUX_AT_SYSINFO_EHDR; a->a_v = NETBSD32PTR32I(&esdp->elfhdr); a++; a->a_type = LINUX_AT_HWCAP; a->a_v = LINUX32_CPUCAP; a++; a->a_type = LINUX_AT_PLATFORM; a->a_v = NETBSD32PTR32I(&esdp->hw_platform[0]); a++; #endif a->a_type = AT_NULL; a->a_v = 0; a++; randbytes[0] = cprng_strong32(); randbytes[1] = cprng_strong32(); randbytes[2] = cprng_strong32(); randbytes[3] = cprng_strong32(); len = sizeof(randbytes); if ((error = copyout(randbytes, *stackp, len)) != 0) return error; *stackp += len; #if 0 memset(&esd, 0, sizeof(esd)); memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall, sizeof(linux32_kernel_vsyscall)); memcpy(&esd.elfhdr, eh, sizeof(*eh)); strcpy(esd.hw_platform, LINUX32_PLATFORM); /* * Copy out the ELF auxiliary table and hw platform name */ if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) return error; *stackp += sizeof(esd); #endif len = (a - ai) * sizeof(Aux32Info); KASSERT(len <= LINUX32_ELF_AUX_ENTRIES * sizeof(Aux32Info)); if ((error = copyout(ai, *stackp, len)) != 0) return error; *stackp += len; return 0; }