FreeBSD/Linux Kernel Cross Reference
sys/compat/freebsd/freebsd_exec_elf32.c

     /*      $NetBSD: freebsd_exec_elf32.c,v 1.17 2007/04/22 08:29:56 dsl Exp $      */
     
     /*
      * Copyright (c) 1993, 1994 Christopher G. Demetriou
      * 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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Christopher G. Demetriou.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: freebsd_exec_elf32.c,v 1.17 2007/04/22 08:29:56 dsl Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/proc.h>
    #include <sys/malloc.h>
    #include <sys/vnode.h>
    #include <sys/exec.h>
    #ifndef ELFSIZE
    #  define ELFSIZE 32
    #endif /* !ELFSIZE */
    #include <sys/exec_elf.h>
    
    #include <compat/sys/signal.h>
    #include <compat/sys/signalvar.h>
    
    #include <compat/freebsd/freebsd_exec.h>
    #include <compat/common/compat_util.h>
    
    #include <machine/freebsd_machdep.h>
    
    
    int
    ELFNAME2(freebsd,probe)(
            struct lwp *l,
            struct exec_package *epp,
            void *veh,
            char *itp,
            vaddr_t *pos)
    {
            int error;
            size_t i;
            size_t phsize;
            Elf_Ehdr *eh = (Elf_Ehdr *) veh;
            Elf_Phdr *ph;
            Elf_Phdr *ephp;
            Elf_Nhdr *np;
    
            static const char wantBrand[] = FREEBSD_ELF_BRAND_STRING;
            static const char wantInterp[] = FREEBSD_ELF_INTERP_PREFIX_STRING;
    
            /*
             * Insist that the executable have a brand, and that it be "FreeBSD".
             * Newer FreeBSD binaries have OSABI set to ELFOSABI_FREEBSD. This
             * is arguably broken, but they seem to think they need it, for
             * whatever reason.
             */
    #ifndef EI_BRAND
    #define EI_BRAND 8
    #endif
            if ((eh->e_ident[EI_BRAND] == '\0'
                    || strcmp(&eh->e_ident[EI_BRAND], wantBrand) != 0)
                && eh->e_ident[EI_OSABI] != ELFOSABI_FREEBSD)
                    return ENOEXEC;
    
            i = eh->e_phnum;
            if (i != 0) {
                    phsize = i * sizeof(Elf_Phdr);
                    ph = (Elf_Phdr *) malloc(phsize, M_TEMP, M_WAITOK);
                    if ((error = exec_read_from(l, epp->ep_vp, eh->e_phoff, ph,
                        phsize)) != 0)
                            goto bad1;
    
                    for (ephp = ph; i--; ephp++) {
                            if (ephp->p_type != PT_INTERP)
                                    continue;
   
                           /* Check for "legal" intepreter name. */
                           if (ephp->p_filesz < sizeof wantInterp)
                                   goto bad1;
   
                           np = (Elf_Nhdr *) malloc(ephp->p_filesz+1,
                               M_TEMP, M_WAITOK);
   
                           if (((error = exec_read_from(l, epp->ep_vp,
                               ephp->p_offset, np, ephp->p_filesz)) != 0))
                                   goto bad2;
   
                           if (strncmp((char *)np, wantInterp,
                               sizeof wantInterp - 1))
                                   goto bad2;
   
                           free(np, M_TEMP);
                           break;
                   }
                   free(ph, M_TEMP);
           }
   
           if (itp) {
                   if ((error = emul_find_interp(l, epp, itp)))
                           return error;
           }
   #ifdef DEBUG_FREEBSD_ELF
           printf("freebsd_elf32_probe: returning 0\n");
   #endif
           return 0;
   
   bad2:
           free(np, M_TEMP);
   bad1:
           free(ph, M_TEMP);
           return ENOEXEC;
   }

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