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diff --git a/config.h.in b/config.h.in
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index a5ad9e7..62a6b32 100644
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--- a/config.h.in
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+++ b/config.h.in
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@@ -748,6 +748,9 @@
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/* Define if you have the pselect function. */
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#undef HAVE_PSELECT
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+/* Define if you have the pread function. */
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+#undef HAVE_PREAD
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+
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/* Define if you have the putenv function. */
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#undef HAVE_PUTENV
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@@ -946,6 +949,9 @@
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/* Define if you have the <dlfcn.h> header file. */
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#undef HAVE_DLFCN_H
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+/* Define if you have the <elf.h> header file. */
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+#undef HAVE_ELF_H
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+
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/* Define if you have the <grp.h> header file. */
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#undef HAVE_GRP_H
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diff --git a/configure.ac b/configure.ac
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index ce4e9b6..eda95d6 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -700,7 +700,7 @@ BASH_HEADER_INTTYPES
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AC_CHECK_HEADERS(unistd.h stdlib.h stdarg.h varargs.h limits.h string.h \
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memory.h locale.h termcap.h termio.h termios.h dlfcn.h \
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stdbool.h stddef.h stdint.h netdb.h pwd.h grp.h strings.h \
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- regex.h syslog.h ulimit.h)
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+ regex.h syslog.h ulimit.h elf.h)
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AC_CHECK_HEADERS(sys/pte.h sys/stream.h sys/select.h sys/file.h sys/ioctl.h \
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sys/param.h sys/socket.h sys/stat.h \
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sys/time.h sys/times.h sys/types.h sys/wait.h)
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@@ -771,7 +771,7 @@ dnl checks for system calls
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AC_CHECK_FUNCS(dup2 eaccess fcntl getdtablesize getgroups gethostname \
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50ece2 |
getpagesize getpeername getrlimit getrusage gettimeofday \
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kill killpg lstat pselect readlink sbrk select setdtablesize \
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- setitimer tcgetpgrp uname ulimit waitpid)
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+ setitimer tcgetpgrp uname ulimit waitpid pread)
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AC_REPLACE_FUNCS(rename)
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dnl checks for c library functions
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diff --git a/execute_cmd.c b/execute_cmd.c
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index 2a3df6d..b5cd405 100644
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--- a/execute_cmd.c
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+++ b/execute_cmd.c
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@@ -41,6 +41,10 @@
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# include <unistd.h>
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#endif
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+#ifdef HAVE_ELF_H
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+# include <elf.h>
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+#endif
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+
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#include "posixtime.h"
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|
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50ece2 |
#if defined (HAVE_SYS_RESOURCE_H) && !defined (RLIMTYPE)
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50ece2 |
@@ -5486,6 +5490,14 @@ shell_execve (command, args, env)
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{
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/* The file has the execute bits set, but the kernel refuses to
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run it for some reason. See why. */
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50ece2 |
+#if defined (HAVE_HASH_BANG_EXEC) || defined (HAVE_ELF_H)
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50ece2 |
+ int fd = open (command, O_RDONLY);
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50ece2 |
+
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50ece2 |
+ if (fd >= 0)
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+ sample_len = read (fd, sample, sizeof (sample));
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+ else
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+ sample_len = -1;
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+#endif
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#if defined (HAVE_HASH_BANG_EXEC)
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READ_SAMPLE_BUF (command, sample, sample_len);
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if (sample_len > 0)
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50ece2 |
@@ -5495,6 +5507,7 @@ shell_execve (command, args, env)
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char *interp;
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int ilen;
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+ close (fd);
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interp = getinterp (sample, sample_len, (int *)NULL);
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ilen = strlen (interp);
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errno = i;
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50ece2 |
@@ -5510,6 +5523,136 @@ shell_execve (command, args, env)
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return (EX_NOEXEC);
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}
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50ece2 |
#endif
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+#if defined (HAVE_ELF_H)
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+ if (i == ENOENT
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+ && sample_len > EI_NIDENT
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+ && memcmp (sample, ELFMAG, SELFMAG) == 0)
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+ {
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+ off_t offset = -1;
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+
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+ /* It is an ELF file. Now determine whether it is dynamically
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+ linked and if yes, get the offset of the interpreter
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50ece2 |
+ string. */
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50ece2 |
+ if (sample[EI_CLASS] == ELFCLASS32
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50ece2 |
+ && sample_len > sizeof (Elf32_Ehdr))
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+ {
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+ Elf32_Ehdr ehdr;
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+ Elf32_Phdr *phdr;
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+ int nphdr;
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+
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+ /* We have to copy the data since the sample buffer
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+ might not be aligned correctly to be accessed as
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+ an Elf32_Ehdr struct. */
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50ece2 |
+ memcpy (&ehdr, sample, sizeof (Elf32_Ehdr));
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+
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+ nphdr = ehdr.e_phnum;
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+ phdr = (Elf32_Phdr *) malloc (nphdr * ehdr.e_phentsize);
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+ if (phdr != NULL)
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+ {
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50ece2 |
+#ifdef HAVE_PREAD
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50ece2 |
+ sample_len = pread (fd, phdr, nphdr * ehdr.e_phentsize,
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+ ehdr.e_phoff);
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+#else
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+ if (lseek (fd, ehdr.e_phoff, SEEK_SET) != -1)
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+ sample_len = read (fd, phdr,
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+ nphdr * ehdr.e_phentsize);
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+ else
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+ sample_len = -1;
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+#endif
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+ if (sample_len == nphdr * ehdr.e_phentsize)
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50ece2 |
+ while (nphdr-- > 0)
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50ece2 |
+ if (phdr[nphdr].p_type == PT_INTERP)
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+ {
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+ offset = phdr[nphdr].p_offset;
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50ece2 |
+ break;
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+ }
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+ free (phdr);
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+ }
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+ }
|
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+ else if (sample[EI_CLASS] == ELFCLASS64
|
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|
50ece2 |
+ && sample_len > sizeof (Elf64_Ehdr))
|
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50ece2 |
+ {
|
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50ece2 |
+ Elf64_Ehdr ehdr;
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50ece2 |
+ Elf64_Phdr *phdr;
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|
50ece2 |
+ int nphdr;
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+
|
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+ /* We have to copy the data since the sample buffer
|
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+ might not be aligned correctly to be accessed as
|
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+ an Elf64_Ehdr struct. */
|
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+ memcpy (&ehdr, sample, sizeof (Elf64_Ehdr));
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+
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+ nphdr = ehdr.e_phnum;
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+ phdr = (Elf64_Phdr *) malloc (nphdr * ehdr.e_phentsize);
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50ece2 |
+ if (phdr != NULL)
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+ {
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+#ifdef HAVE_PREAD
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+ sample_len = pread (fd, phdr, nphdr * ehdr.e_phentsize,
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+ ehdr.e_phoff);
|
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+#else
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+ if (lseek (fd, ehdr.e_phoff, SEEK_SET) != -1)
|
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50ece2 |
+ sample_len = read (fd, phdr,
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|
50ece2 |
+ nphdr * ehdr.e_phentsize);
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+ else
|
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+ sample_len = -1;
|
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50ece2 |
+#endif
|
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|
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+ if (sample_len == nphdr * ehdr.e_phentsize)
|
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|
50ece2 |
+ while (nphdr-- > 0)
|
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|
50ece2 |
+ if (phdr[nphdr].p_type == PT_INTERP)
|
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|
50ece2 |
+ {
|
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|
50ece2 |
+ offset = phdr[nphdr].p_offset;
|
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|
50ece2 |
+ break;
|
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|
50ece2 |
+ }
|
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|
50ece2 |
+ free (phdr);
|
|
|
50ece2 |
+ }
|
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|
50ece2 |
+ }
|
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|
50ece2 |
+
|
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|
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+ if (offset != -1)
|
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|
50ece2 |
+ {
|
|
|
50ece2 |
+ size_t maxlen = 0;
|
|
|
50ece2 |
+ size_t actlen = 0;
|
|
|
50ece2 |
+ char *interp = NULL;
|
|
|
50ece2 |
+
|
|
|
50ece2 |
+ do
|
|
|
50ece2 |
+ {
|
|
|
50ece2 |
+ if (actlen == maxlen)
|
|
|
50ece2 |
+ {
|
|
|
50ece2 |
+ char *newinterp = realloc (interp, maxlen += 200);
|
|
|
50ece2 |
+ if (newinterp == NULL)
|
|
|
50ece2 |
+ {
|
|
|
50ece2 |
+ actlen = 0;
|
|
|
50ece2 |
+ break;
|
|
|
50ece2 |
+ }
|
|
|
50ece2 |
+ interp = newinterp;
|
|
|
50ece2 |
+
|
|
|
50ece2 |
+#ifdef HAVE_PREAD
|
|
|
50ece2 |
+ actlen = pread (fd, interp, maxlen, offset);
|
|
|
50ece2 |
+#else
|
|
|
50ece2 |
+ if (lseek (fd, offset, SEEK_SET) != -1)
|
|
|
50ece2 |
+ actlen = read (fd, interp, maxlen);
|
|
|
50ece2 |
+ else
|
|
|
50ece2 |
+ actlen = -1;
|
|
|
50ece2 |
+#endif
|
|
|
50ece2 |
+ }
|
|
|
50ece2 |
+ }
|
|
|
50ece2 |
+ while (actlen > 0 && memchr (interp, '\0', actlen) == NULL);
|
|
|
50ece2 |
+
|
|
|
50ece2 |
+ if (actlen > 0)
|
|
|
50ece2 |
+ {
|
|
|
50ece2 |
+ close (fd);
|
|
|
50ece2 |
+ errno = i;
|
|
|
50ece2 |
+ sys_error ("%s: %s: bad ELF interpreter", command,
|
|
|
50ece2 |
+ interp);
|
|
|
50ece2 |
+ free (interp);
|
|
|
50ece2 |
+ return (EX_NOEXEC);
|
|
|
50ece2 |
+ }
|
|
|
50ece2 |
+
|
|
|
50ece2 |
+ free (interp);
|
|
|
50ece2 |
+ }
|
|
|
50ece2 |
+ }
|
|
|
50ece2 |
+#endif
|
|
|
50ece2 |
+#if defined (HAVE_HASH_BANG_EXEC) || defined (HAVE_ELF_H)
|
|
|
50ece2 |
+ close (fd);
|
|
|
50ece2 |
+#endif
|
|
|
50ece2 |
errno = i;
|
|
|
50ece2 |
file_error (command);
|
|
|
50ece2 |
}
|
|
|
50ece2 |
--
|
|
|
50ece2 |
2.9.3
|
|
|
50ece2 |
|