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b92f7d |
diff --git a/config.h.in b/config.h.in
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b92f7d |
index ab316d4..11d1d68 100644
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b92f7d |
--- a/config.h.in
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b92f7d |
+++ b/config.h.in
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b92f7d |
@@ -775,6 +775,9 @@
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b92f7d |
/* Define if you have the pselect function. */
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b92f7d |
#undef HAVE_PSELECT
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b92f7d |
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b92f7d |
+/* Define if you have the pread function. */
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b92f7d |
+#undef HAVE_PREAD
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b92f7d |
+
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b92f7d |
/* Define if you have the putenv function. */
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b92f7d |
#undef HAVE_PUTENV
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b92f7d |
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b92f7d |
@@ -981,6 +984,9 @@
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b92f7d |
/* Define if you have the <dlfcn.h> header file. */
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b92f7d |
#undef HAVE_DLFCN_H
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b92f7d |
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b92f7d |
+/* Define if you have the <elf.h> header file. */
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b92f7d |
+#undef HAVE_ELF_H
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b92f7d |
+
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b92f7d |
/* Define if you have the <grp.h> header file. */
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b92f7d |
#undef HAVE_GRP_H
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b92f7d |
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b92f7d |
diff --git a/configure.ac b/configure.ac
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b92f7d |
index 2fe3e7d..f1b7f1b 100644
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b92f7d |
--- a/configure.ac
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b92f7d |
+++ b/configure.ac
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b92f7d |
@@ -827,7 +827,7 @@ dnl checks for system calls
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b92f7d |
AC_CHECK_FUNCS(dup2 eaccess fcntl getdtablesize getentropy getgroups \
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b92f7d |
gethostname getpagesize getpeername getrandom getrlimit \
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b92f7d |
getrusage gettimeofday kill killpg lstat pselect readlink \
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b92f7d |
- select setdtablesize setitimer tcgetpgrp uname ulimit waitpid)
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b92f7d |
+ select setdtablesize setitimer tcgetpgrp uname ulimit waitpid pread)
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b92f7d |
AC_REPLACE_FUNCS(rename)
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b92f7d |
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b92f7d |
dnl checks for c library functions
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b92f7d |
diff --git a/execute_cmd.c b/execute_cmd.c
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b92f7d |
index d2a0dd7..d2555ad 100644
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b92f7d |
--- a/execute_cmd.c
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b92f7d |
+++ b/execute_cmd.c
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b92f7d |
@@ -41,6 +41,10 @@
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b92f7d |
# include <unistd.h>
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b92f7d |
#endif
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b92f7d |
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b92f7d |
+#ifdef HAVE_ELF_H
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b92f7d |
+# include <elf.h>
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b92f7d |
+#endif
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b92f7d |
+
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b92f7d |
#include "posixtime.h"
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b92f7d |
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b92f7d |
#if defined (HAVE_SYS_RESOURCE_H) && !defined (RLIMTYPE)
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b92f7d |
@@ -5832,6 +5836,14 @@ shell_execve (command, args, env)
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b92f7d |
{
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b92f7d |
/* The file has the execute bits set, but the kernel refuses to
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b92f7d |
run it for some reason. See why. */
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b92f7d |
+#if defined (HAVE_HASH_BANG_EXEC) || defined (HAVE_ELF_H)
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b92f7d |
+ int fd = open (command, O_RDONLY);
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b92f7d |
+
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b92f7d |
+ if (fd >= 0)
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b92f7d |
+ sample_len = read (fd, sample, sizeof (sample));
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b92f7d |
+ else
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b92f7d |
+ sample_len = -1;
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b92f7d |
+#endif
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b92f7d |
#if defined (HAVE_HASH_BANG_EXEC)
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b92f7d |
READ_SAMPLE_BUF (command, sample, sample_len);
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b92f7d |
if (sample_len > 0)
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b92f7d |
@@ -5841,6 +5853,7 @@ shell_execve (command, args, env)
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b92f7d |
char *interp;
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b92f7d |
int ilen;
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b92f7d |
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b92f7d |
+ close (fd);
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b92f7d |
interp = getinterp (sample, sample_len, (int *)NULL);
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b92f7d |
ilen = strlen (interp);
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b92f7d |
errno = i;
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b92f7d |
@@ -5856,7 +5869,138 @@ shell_execve (command, args, env)
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b92f7d |
return (EX_NOEXEC);
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b92f7d |
}
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b92f7d |
#endif
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b92f7d |
- errno = i;
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b92f7d |
+#if defined (HAVE_ELF_H)
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b92f7d |
+ if (i == ENOENT
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b92f7d |
+ && sample_len > EI_NIDENT
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b92f7d |
+ && memcmp (sample, ELFMAG, SELFMAG) == 0)
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b92f7d |
+ {
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b92f7d |
+ off_t offset = -1;
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b92f7d |
+
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b92f7d |
+ /* It is an ELF file. Now determine whether it is dynamically
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b92f7d |
+ linked and if yes, get the offset of the interpreter
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b92f7d |
+ string. */
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b92f7d |
+ if (sample[EI_CLASS] == ELFCLASS32
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b92f7d |
+ && sample_len > sizeof (Elf32_Ehdr))
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b92f7d |
+ {
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b92f7d |
+ Elf32_Ehdr ehdr;
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b92f7d |
+ Elf32_Phdr *phdr;
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b92f7d |
+ int nphdr;
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b92f7d |
+
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b92f7d |
+ /* We have to copy the data since the sample buffer
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b92f7d |
+ might not be aligned correctly to be accessed as
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b92f7d |
+ an Elf32_Ehdr struct. */
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b92f7d |
+ memcpy (&ehdr, sample, sizeof (Elf32_Ehdr));
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b92f7d |
+
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b92f7d |
+ nphdr = ehdr.e_phnum;
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b92f7d |
+ phdr = (Elf32_Phdr *) malloc (nphdr * ehdr.e_phentsize);
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b92f7d |
+ if (phdr != NULL)
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b92f7d |
+ {
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b92f7d |
+#ifdef HAVE_PREAD
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b92f7d |
+ sample_len = pread (fd, phdr, nphdr * ehdr.e_phentsize,
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b92f7d |
+ ehdr.e_phoff);
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b92f7d |
+#else
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b92f7d |
+ if (lseek (fd, ehdr.e_phoff, SEEK_SET) != -1)
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b92f7d |
+ sample_len = read (fd, phdr,
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b92f7d |
+ nphdr * ehdr.e_phentsize);
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b92f7d |
+ else
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b92f7d |
+ sample_len = -1;
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b92f7d |
+#endif
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b92f7d |
+ if (sample_len == nphdr * ehdr.e_phentsize)
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b92f7d |
+ while (nphdr-- > 0)
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b92f7d |
+ if (phdr[nphdr].p_type == PT_INTERP)
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b92f7d |
+ {
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b92f7d |
+ offset = phdr[nphdr].p_offset;
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b92f7d |
+ break;
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b92f7d |
+ }
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b92f7d |
+ free (phdr);
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b92f7d |
+ }
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b92f7d |
+ }
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b92f7d |
+ else if (sample[EI_CLASS] == ELFCLASS64
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b92f7d |
+ && sample_len > sizeof (Elf64_Ehdr))
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b92f7d |
+ {
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b92f7d |
+ Elf64_Ehdr ehdr;
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b92f7d |
+ Elf64_Phdr *phdr;
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b92f7d |
+ int nphdr;
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b92f7d |
+
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b92f7d |
+ /* We have to copy the data since the sample buffer
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b92f7d |
+ might not be aligned correctly to be accessed as
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b92f7d |
+ an Elf64_Ehdr struct. */
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b92f7d |
+ memcpy (&ehdr, sample, sizeof (Elf64_Ehdr));
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b92f7d |
+
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b92f7d |
+ nphdr = ehdr.e_phnum;
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b92f7d |
+ phdr = (Elf64_Phdr *) malloc (nphdr * ehdr.e_phentsize);
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b92f7d |
+ if (phdr != NULL)
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b92f7d |
+ {
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b92f7d |
+#ifdef HAVE_PREAD
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b92f7d |
+ sample_len = pread (fd, phdr, nphdr * ehdr.e_phentsize,
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b92f7d |
+ ehdr.e_phoff);
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b92f7d |
+#else
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b92f7d |
+ if (lseek (fd, ehdr.e_phoff, SEEK_SET) != -1)
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b92f7d |
+ sample_len = read (fd, phdr,
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b92f7d |
+ nphdr * ehdr.e_phentsize);
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b92f7d |
+ else
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b92f7d |
+ sample_len = -1;
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b92f7d |
+#endif
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b92f7d |
+ if (sample_len == nphdr * ehdr.e_phentsize)
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b92f7d |
+ while (nphdr-- > 0)
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b92f7d |
+ if (phdr[nphdr].p_type == PT_INTERP)
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b92f7d |
+ {
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b92f7d |
+ offset = phdr[nphdr].p_offset;
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b92f7d |
+ break;
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b92f7d |
+ }
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b92f7d |
+ free (phdr);
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b92f7d |
+ }
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b92f7d |
+ }
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b92f7d |
+
|
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b92f7d |
+ if (offset != -1)
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b92f7d |
+ {
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|
b92f7d |
+ size_t maxlen = 0;
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|
b92f7d |
+ size_t actlen = 0;
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|
b92f7d |
+ char *interp = NULL;
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|
b92f7d |
+
|
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|
b92f7d |
+ do
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|
b92f7d |
+ {
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|
b92f7d |
+ if (actlen == maxlen)
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|
b92f7d |
+ {
|
|
|
b92f7d |
+ char *newinterp = realloc (interp, maxlen += 200);
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|
b92f7d |
+ if (newinterp == NULL)
|
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|
b92f7d |
+ {
|
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|
b92f7d |
+ actlen = 0;
|
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|
b92f7d |
+ break;
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|
b92f7d |
+ }
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|
b92f7d |
+ interp = newinterp;
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|
b92f7d |
+
|
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|
b92f7d |
+#ifdef HAVE_PREAD
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|
b92f7d |
+ actlen = pread (fd, interp, maxlen, offset);
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b92f7d |
+#else
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|
b92f7d |
+ if (lseek (fd, offset, SEEK_SET) != -1)
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b92f7d |
+ actlen = read (fd, interp, maxlen);
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b92f7d |
+ else
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b92f7d |
+ actlen = -1;
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b92f7d |
+#endif
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b92f7d |
+ }
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b92f7d |
+ }
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b92f7d |
+ while (actlen > 0 && memchr (interp, '\0', actlen) == NULL);
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b92f7d |
+
|
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b92f7d |
+ if (actlen > 0)
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b92f7d |
+ {
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b92f7d |
+ close (fd);
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b92f7d |
+ errno = i;
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b92f7d |
+ sys_error ("%s: %s: bad ELF interpreter", command,
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b92f7d |
+ interp);
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|
b92f7d |
+ free (interp);
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|
b92f7d |
+ return (EX_NOEXEC);
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b92f7d |
+ }
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|
b92f7d |
+
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|
b92f7d |
+ free (interp);
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b92f7d |
+ }
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|
b92f7d |
+ }
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b92f7d |
+#endif
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|
b92f7d |
+#if defined (HAVE_HASH_BANG_EXEC) || defined (HAVE_ELF_H)
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b92f7d |
+ close (fd);
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|
b92f7d |
+#endif
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|
b92f7d |
+
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b92f7d |
+ errno = i;
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|
b92f7d |
file_error (command);
|
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|
b92f7d |
}
|
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|
b92f7d |
return (last_command_exit_value);
|