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authorUlrich Drepper <drepper@redhat.com>2005-01-20 20:10:02 +0000
committerUlrich Drepper <drepper@redhat.com>2005-01-20 20:10:02 +0000
commit57b47af94b3c886ca65e32c41a9f665baaf823f0 (patch)
tree7ba1c4dae362d23c75548f5161e7bf463541e0f0 /posix/execvp.c
parentf89c41c11634c6971cf001e7b59dc96d540cad65 (diff)
downloadglibc-57b47af94b3c886ca65e32c41a9f665baaf823f0.tar.gz
Update.
2005-01-20 Ulrich Drepper <drepper@redhat.com> * posix/execl.c: Do not allocate potentially large buffers on the stack. * posix/execle.c: Likewise. * posix/execlp.c: Likewise. * posix/execlp.c: Likewise. (script_execute): Removed. (allocate_scripts_argv): New function. Called at most once to allocate memory, not every time a script is run. Adjust caller. * sysdeps/generic/wordexp.c (exec_comm): Add a few TEMP_FAILURE_RETRY. Reorganize code to avoid multiple calls to exec_comm_child. (exec_comm_child): Can now be inlined. * posix/Makefile: Add -fomit-frame-pointer for a few more files. * stdlib/Makefile: Likewise.
Diffstat (limited to 'posix/execvp.c')
-rw-r--r--posix/execvp.c97
1 files changed, 66 insertions, 31 deletions
diff --git a/posix/execvp.c b/posix/execvp.c
index d6f60c02e7..d8dce7aeb7 100644
--- a/posix/execvp.c
+++ b/posix/execvp.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991,92,1995-99,2002,2004 Free Software Foundation, Inc.
+/* Copyright (C) 1991,92,1995-99,2002,2004,2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -26,9 +26,9 @@
/* The file is accessible but it is not an executable file. Invoke
the shell to interpret it as a script. */
-static void
+static char **
internal_function
-script_execute (const char *file, char *const argv[])
+allocate_scripts_argv (const char *file, char *const argv[])
{
/* Count the arguments. */
int argc = 0;
@@ -36,19 +36,19 @@ script_execute (const char *file, char *const argv[])
;
/* Construct an argument list for the shell. */
- {
- char *new_argv[argc + 1];
- new_argv[0] = (char *) _PATH_BSHELL;
- new_argv[1] = (char *) file;
- while (argc > 1)
- {
- new_argv[argc] = argv[argc - 1];
- --argc;
- }
-
- /* Execute the shell. */
- __execve (new_argv[0], new_argv, __environ);
- }
+ char **new_argv = (char **) malloc ((argc + 1) * sizeof (char *));
+ if (new_argv != NULL)
+ {
+ new_argv[0] = (char *) _PATH_BSHELL;
+ new_argv[1] = (char *) file;
+ while (argc > 1)
+ {
+ new_argv[argc] = argv[argc - 1];
+ --argc;
+ }
+ }
+
+ return new_argv;
}
@@ -66,42 +66,58 @@ execvp (file, argv)
return -1;
}
+ char **script_argv = NULL;
+
if (strchr (file, '/') != NULL)
{
/* Don't search when it contains a slash. */
__execve (file, argv, __environ);
if (errno == ENOEXEC)
- script_execute (file, argv);
+ {
+ script_argv = allocate_scripts_argv (file, argv);
+ if (script_argv != NULL)
+ {
+ __execve (script_argv[0], script_argv, __environ);
+
+ free (script_argv);
+ }
+ }
}
else
{
- int got_eacces = 0;
- char *path, *p, *name;
- size_t len;
- size_t pathlen;
-
- path = getenv ("PATH");
+ char *path = getenv ("PATH");
+ bool path_malloc = false;
if (path == NULL)
{
/* There is no `PATH' in the environment.
The default search path is the current directory
followed by the path `confstr' returns for `_CS_PATH'. */
- len = confstr (_CS_PATH, (char *) NULL, 0);
- path = (char *) __alloca (1 + len);
+ size_t len = confstr (_CS_PATH, (char *) NULL, 0);
+ path = (char *) malloc (1 + len);
+ if (path == NULL)
+ return -1;
path[0] = ':';
(void) confstr (_CS_PATH, path + 1, len);
+ path_malloc = true;
}
- len = strlen (file) + 1;
- pathlen = strlen (path);
- name = __alloca (pathlen + len + 1);
+ size_t len = strlen (file) + 1;
+ size_t pathlen = strlen (path);
+ char *name = malloc (pathlen + len + 1);
+ if (name == NULL)
+ {
+ if (path_malloc)
+ free (path);
+ return -1;
+ }
/* Copy the file name at the top. */
name = (char *) memcpy (name + pathlen + 1, file, len);
/* And add the slash. */
*--name = '/';
- p = path;
+ bool got_eacces = false;
+ char *p = path;
do
{
char *startp;
@@ -120,7 +136,21 @@ execvp (file, argv)
__execve (startp, argv, __environ);
if (errno == ENOEXEC)
- script_execute (startp, argv);
+ {
+ if (script_argv == NULL)
+ {
+ script_argv = allocate_scripts_argv (file, argv);
+ if (script_argv == NULL)
+ {
+ /* A possible EACCES error is not as important as
+ the ENOMEM. */
+ got_eacces = false;
+ break;
+ }
+ }
+
+ __execve (script_argv[0], script_argv, __environ);
+ }
switch (errno)
{
@@ -128,7 +158,7 @@ execvp (file, argv)
/* Record the we got a `Permission denied' error. If we end
up finding no executable we can use, we want to diagnose
that we did find one but were denied access. */
- got_eacces = 1;
+ got_eacces = true;
case ENOENT:
case ESTALE:
case ENOTDIR:
@@ -156,6 +186,11 @@ execvp (file, argv)
/* At least one failure was due to permissions, so report that
error. */
__set_errno (EACCES);
+
+ free (script_argv);
+ free (name);
+ if (path_malloc)
+ free (path);
}
/* Return the error from the last attempt (probably ENOENT). */