diff -up bash-4.2-rc2/config.h.in.interpreter bash-4.2-rc2/config.h.in

--- bash-4.2-rc2/config.h.in.interpreter	2011-02-09 07:59:21.000000000 +0100

+++ bash-4.2-rc2/config.h.in	2011-02-09 07:59:21.000000000 +0100

@@ -706,6 +706,9 @@

 /* Define if you have the pathconf function. */

 #undef HAVE_PATHCONF

+/* Define if you have the pread function. */

+#undef HAVE_PREAD

+

 /* Define if you have the putenv function.  */

 #undef HAVE_PUTENV

@@ -898,6 +901,9 @@

 /* Define if you have the <dlfcn.h> header file.  */

 #undef HAVE_DLFCN_H

+/* Define if you have the <elf.h> header file.  */

+#undef HAVE_ELF_H

+

 /* Define if you have the <grp.h> header file.  */

 #undef HAVE_GRP_H

diff -up bash-4.2-rc2/configure.in.interpreter bash-4.2-rc2/configure.in

--- bash-4.2-rc2/configure.in.interpreter	2011-01-16 21:31:12.000000000 +0100

+++ bash-4.2-rc2/configure.in	2011-02-09 08:02:27.000000000 +0100

@@ -659,7 +659,7 @@ BASH_HEADER_INTTYPES

 AC_CHECK_HEADERS(unistd.h stdlib.h stdarg.h varargs.h limits.h string.h \

 		 memory.h locale.h termcap.h termio.h termios.h dlfcn.h \

 		 stddef.h stdint.h netdb.h pwd.h grp.h strings.h regex.h \

-		 syslog.h ulimit.h)

+		 syslog.h ulimit.h elf.h)

 AC_CHECK_HEADERS(sys/pte.h sys/stream.h sys/select.h sys/file.h \

 		 sys/resource.h sys/param.h sys/socket.h sys/stat.h \

 		 sys/time.h sys/times.h sys/types.h sys/wait.h)

@@ -723,7 +723,7 @@ dnl checks for system calls

 AC_CHECK_FUNCS(dup2 eaccess fcntl getdtablesize getgroups gethostname \

 		getpagesize getpeername getrlimit getrusage gettimeofday \

 		kill killpg lstat readlink sbrk select setdtablesize \

-		setitimer tcgetpgrp uname ulimit waitpid)

+		setitimer tcgetpgrp uname ulimit waitpid pread)

 AC_REPLACE_FUNCS(rename)

 dnl checks for c library functions

diff -up bash-4.2-rc2/execute_cmd.c.interpreter bash-4.2-rc2/execute_cmd.c

--- bash-4.2-rc2/execute_cmd.c.interpreter	2011-01-20 04:24:47.000000000 +0100

+++ bash-4.2-rc2/execute_cmd.c	2011-02-09 07:59:21.000000000 +0100

@@ -41,6 +41,10 @@

 #  include <unistd.h>

 #endif

+#ifdef HAVE_ELF_H

+# include <elf.h>

+#endif

+

 #include "posixtime.h"

 #if defined (HAVE_SYS_RESOURCE_H) && !defined (RLIMTYPE)

@@ -4975,13 +4979,21 @@ shell_execve (command, args, env)

 	{

 	  /* The file has the execute bits set, but the kernel refuses to

 	     run it for some reason.  See why. */

+#if defined (HAVE_HASH_BANG_EXEC) || defined (HAVE_ELF_H)

+	int fd = open (command, O_RDONLY);

+

+	if (fd >= 0)

+		sample_len = read (fd, sample, sizeof (sample));

+	else

+		sample_len = -1;

+#endif

 #if defined (HAVE_HASH_BANG_EXEC)

-	  READ_SAMPLE_BUF (command, sample, sample_len);

 	  if (sample_len > 2 && sample[0] == '#' && sample[1] == '!')

 	    {

 	      char *interp;

 	      int ilen;

+	      close (fd);

 	      interp = getinterp (sample, sample_len, (int *)NULL);

 	      ilen = strlen (interp);

 	      errno = i;

@@ -4997,6 +5009,136 @@ shell_execve (command, args, env)

 	      return (EX_NOEXEC);

 	    }

 #endif

+#if defined (HAVE_ELF_H)

+	  if (i == ENOENT

+	      && sample_len > EI_NIDENT

+	      && memcmp (sample, ELFMAG, SELFMAG) == 0)

+	    {

+	      off_t offset = -1;

+

+	      /* It is an ELF file.  Now determine whether it is dynamically

+		 linked and if yes, get the offset of the interpreter

+		 string.  */

+	      if (sample[EI_CLASS] == ELFCLASS32

+		  && sample_len > sizeof (Elf32_Ehdr))

+		{

+		  Elf32_Ehdr ehdr;

+		  Elf32_Phdr *phdr;

+		  int nphdr;

+

+		  /* We have to copy the data since the sample buffer

+		     might not be aligned correctly to be accessed as

+		     an Elf32_Ehdr struct.  */

+		  memcpy (&ehdr, sample, sizeof (Elf32_Ehdr));

+

+		  nphdr = ehdr.e_phnum;

+		  phdr = (Elf32_Phdr *) malloc (nphdr * ehdr.e_phentsize);

+		  if (phdr != NULL)

+		    {

+#ifdef HAVE_PREAD

+		      sample_len = pread (fd, phdr, nphdr * ehdr.e_phentsize,

+					  ehdr.e_phoff);

+#else

+		      if (lseek (fd, ehdr.e_phoff, SEEK_SET) != -1)

+			sample_len = read (fd, phdr,

+					   nphdr * ehdr.e_phentsize);

+		      else

+			sample_len = -1;

+#endif

+		      if (sample_len == nphdr * ehdr.e_phentsize)

+			while (nphdr-- > 0)

+			  if (phdr[nphdr].p_type == PT_INTERP)

+			    {

+			      offset = phdr[nphdr].p_offset;

+			      break;

+			    }

+		      free (phdr);

+		    }

+		}

+	      else if (sample[EI_CLASS] == ELFCLASS64

+		       && sample_len > sizeof (Elf64_Ehdr))

+		{

+		  Elf64_Ehdr ehdr;

+		  Elf64_Phdr *phdr;

+		  int nphdr;

+

+		  /* We have to copy the data since the sample buffer

+		     might not be aligned correctly to be accessed as

+		     an Elf64_Ehdr struct.  */

+		  memcpy (&ehdr, sample, sizeof (Elf64_Ehdr));

+

+		  nphdr = ehdr.e_phnum;

+		  phdr = (Elf64_Phdr *) malloc (nphdr * ehdr.e_phentsize);

+		  if (phdr != NULL)

+		    {

+#ifdef HAVE_PREAD

+		      sample_len = pread (fd, phdr, nphdr * ehdr.e_phentsize,

+					  ehdr.e_phoff);

+#else

+		      if (lseek (fd, ehdr.e_phoff, SEEK_SET) != -1)

+			sample_len = read (fd, phdr,

+					   nphdr * ehdr.e_phentsize);

+		      else

+			sample_len = -1;

+#endif

+		      if (sample_len == nphdr * ehdr.e_phentsize)

+			while (nphdr-- > 0)

+			  if (phdr[nphdr].p_type == PT_INTERP)

+			    {

+			      offset = phdr[nphdr].p_offset;

+			      break;

+			    }

+		      free (phdr);

+		    }

+		}

+

+	      if (offset != -1)

+		{

+		  size_t maxlen = 0;

+		  size_t actlen = 0;

+		  char *interp = NULL;

+

+		  do

+		    {

+		      if (actlen == maxlen)

+			{

+			  char *newinterp = realloc (interp, maxlen += 200);

+			  if (newinterp == NULL)

+			    {

+			      actlen = 0;

+			      break;

+			    }

+			  interp = newinterp;

+

+#ifdef HAVE_PREAD

+			  actlen = pread (fd, interp, maxlen, offset);

+#else

+			  if (lseek (fd, offset, SEEK_SET) != -1)

+			    actlen = read (fd, interp, maxlen);

+			  else

+			    actlen = -1;

+#endif

+			}

+		    }

+		  while (actlen > 0 && memchr (interp, '\0', actlen) == NULL);

+

+		  if (actlen > 0)

+		    {

+		      close (fd);

+		      errno = i;

+		      sys_error ("%s: %s: bad ELF interpreter", command,

+				 interp);

+		      free (interp);

+		      return (EX_NOEXEC);

+		    }

+

+		  free (interp);

+		}

+	    }

+#endif

+#if defined (HAVE_HASH_BANG_EXEC) || defined (HAVE_ELF_H)

+	  close (fd);

+#endif

 	  errno = i;

 	  file_error (command);

 	}