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Guard against the POSIX allowed behavior where access (file, X_OK)

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Sun Dec  8 23:36:12 2002  Owen Taylor  <otaylor@redhat.com>

        * glib/gfileutils.c (g_file_test): Guard against
        the POSIX allowed behavior where access (file, X_OK)
        succeeds for uid==0 when no executable bits are set.

        * glib/gfileutils.c (g_file_test): Add doc notes
        about the possibility of race conditions, and the
        fact that EXISTS and IS_EXECUTABLE give results
        for the real uid not the effective user ID.
        (#81854, Morten Welinder.)
This commit is contained in:
Owen Taylor 2002-12-09 04:52:52 +00:00 committed by Owen Taylor
parent b9da696ea0
commit 87f9f15180
8 changed files with 134 additions and 5 deletions
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12
ChangeLog
View File

@ -1,3 +1,15 @@
Sun Dec 8 23:36:12 2002 Owen Taylor <otaylor@redhat.com>
* glib/gfileutils.c (g_file_test): Guard against
the POSIX allowed behavior where access (file, X_OK)
succeeds for uid==0 when no executable bits are set.
* glib/gfileutils.c (g_file_test): Add doc notes
about the possibility of race conditions, and the
fact that EXISTS and IS_EXECUTABLE give results
for the real uid not the effective user ID.
(#81854, Morten Welinder.)
Fri Dec 6 14:34:42 2002 Owen Taylor <otaylor@redhat.com>
Avoid literal UTF-8. (Allow it to build with

12
ChangeLog.pre-2-10
View File

@ -1,3 +1,15 @@
Sun Dec 8 23:36:12 2002 Owen Taylor <otaylor@redhat.com>
* glib/gfileutils.c (g_file_test): Guard against
the POSIX allowed behavior where access (file, X_OK)
succeeds for uid==0 when no executable bits are set.
* glib/gfileutils.c (g_file_test): Add doc notes
about the possibility of race conditions, and the
fact that EXISTS and IS_EXECUTABLE give results
for the real uid not the effective user ID.
(#81854, Morten Welinder.)
Fri Dec 6 14:34:42 2002 Owen Taylor <otaylor@redhat.com>
Avoid literal UTF-8. (Allow it to build with

12
ChangeLog.pre-2-12
View File

@ -1,3 +1,15 @@
Sun Dec 8 23:36:12 2002 Owen Taylor <otaylor@redhat.com>
* glib/gfileutils.c (g_file_test): Guard against
the POSIX allowed behavior where access (file, X_OK)
succeeds for uid==0 when no executable bits are set.
* glib/gfileutils.c (g_file_test): Add doc notes
about the possibility of race conditions, and the
fact that EXISTS and IS_EXECUTABLE give results
for the real uid not the effective user ID.
(#81854, Morten Welinder.)
Fri Dec 6 14:34:42 2002 Owen Taylor <otaylor@redhat.com>
Avoid literal UTF-8. (Allow it to build with

12
ChangeLog.pre-2-2
View File

@ -1,3 +1,15 @@
Sun Dec 8 23:36:12 2002 Owen Taylor <otaylor@redhat.com>
* glib/gfileutils.c (g_file_test): Guard against
the POSIX allowed behavior where access (file, X_OK)
succeeds for uid==0 when no executable bits are set.
* glib/gfileutils.c (g_file_test): Add doc notes
about the possibility of race conditions, and the
fact that EXISTS and IS_EXECUTABLE give results
for the real uid not the effective user ID.
(#81854, Morten Welinder.)
Fri Dec 6 14:34:42 2002 Owen Taylor <otaylor@redhat.com>
Avoid literal UTF-8. (Allow it to build with

12
ChangeLog.pre-2-4
View File

@ -1,3 +1,15 @@
Sun Dec 8 23:36:12 2002 Owen Taylor <otaylor@redhat.com>
* glib/gfileutils.c (g_file_test): Guard against
the POSIX allowed behavior where access (file, X_OK)
succeeds for uid==0 when no executable bits are set.
* glib/gfileutils.c (g_file_test): Add doc notes
about the possibility of race conditions, and the
fact that EXISTS and IS_EXECUTABLE give results
for the real uid not the effective user ID.
(#81854, Morten Welinder.)
Fri Dec 6 14:34:42 2002 Owen Taylor <otaylor@redhat.com>
Avoid literal UTF-8. (Allow it to build with

12
ChangeLog.pre-2-6
View File

@ -1,3 +1,15 @@
Sun Dec 8 23:36:12 2002 Owen Taylor <otaylor@redhat.com>
* glib/gfileutils.c (g_file_test): Guard against
the POSIX allowed behavior where access (file, X_OK)
succeeds for uid==0 when no executable bits are set.
* glib/gfileutils.c (g_file_test): Add doc notes
about the possibility of race conditions, and the
fact that EXISTS and IS_EXECUTABLE give results
for the real uid not the effective user ID.
(#81854, Morten Welinder.)
Fri Dec 6 14:34:42 2002 Owen Taylor <otaylor@redhat.com>
Avoid literal UTF-8. (Allow it to build with

12
ChangeLog.pre-2-8
View File

@ -1,3 +1,15 @@
Sun Dec 8 23:36:12 2002 Owen Taylor <otaylor@redhat.com>
* glib/gfileutils.c (g_file_test): Guard against
the POSIX allowed behavior where access (file, X_OK)
succeeds for uid==0 when no executable bits are set.
* glib/gfileutils.c (g_file_test): Add doc notes
about the possibility of race conditions, and the
fact that EXISTS and IS_EXECUTABLE give results
for the real uid not the effective user ID.
(#81854, Morten Welinder.)
Fri Dec 6 14:34:42 2002 Owen Taylor <otaylor@redhat.com>
Avoid literal UTF-8. (Allow it to build with

55
glib/gfileutils.c
View File

@ -77,12 +77,34 @@
* test is %TRUE. With the current set of available tests, there's no point
* passing in more than one test at a time.
*
* Apart from #G_FILE_TEST_IS_SYMLINK all tests follow symbolic links,
* Apart from %G_FILE_TEST_IS_SYMLINK all tests follow symbolic links,
* so for a symbolic link to a regular file g_file_test() will return
* %TRUE for both #G_FILE_TEST_IS_SYMLINK and #G_FILE_TEST_IS_REGULAR.
* %TRUE for both %G_FILE_TEST_IS_SYMLINK and %G_FILE_TEST_IS_REGULAR.
*
* Note, that for a dangling symbolic link g_file_test() will return
* %TRUE for #G_FILE_TEST_IS_SYMLINK and %FALSE for all other flags.
* %TRUE for %G_FILE_TEST_IS_SYMLINK and %FALSE for all other flags.
*
* You should never use g_file_test() to test whether it is safe
* to perform an operaton, because there is always the possibility
* of the condition changing before you actually perform the operation.
* For example, you might think you could use %G_FILE_TEST_IS_SYMLINK
* to know whether it is is safe to write to a file without being
* tricked into writing into a different location. It doesn't work!
*
* <informalexample><programlisting>
* /&ast; DON'T DO THIS &ast;/
* if (!g_file_test (filename, G_FILE_TEST_IS_SYMLINK)) {
* fd = open (filename, O_WRONLY);
* /&ast; write to fd &ast;/
* }
* </programlisting></informalexample>
*
* Another thing to note is that %G_FILE_TEST_EXISTS and
* %G_FILE_TEST_IS_EXECUTABLE are implemented using the access()
* system call. This usually doesn't matter, but if your program
* is setuid or setgid it means that these tests will give you
* the answer for the real user ID and group ID , rather than the
* effective user ID and group ID.
*
* Return value: whether a test was %TRUE
**/
@ -94,7 +116,19 @@ g_file_test (const gchar *filename,
return TRUE;
if ((test & G_FILE_TEST_IS_EXECUTABLE) && (access (filename, X_OK) == 0))
return TRUE;
{
#ifndef G_OS_WIN32
if (getuid () != 0)
#endif
return TRUE;
/* For root, on some POSIX systems, access (filename, X_OK)
* will succeed even if no executable bits are set on the
* file. We fall through to a stat test to avoid that.
*/
}
else
test &= ~G_FILE_TEST_IS_EXECUTABLE;
if (test & G_FILE_TEST_IS_SYMLINK)
{
@ -108,7 +142,9 @@ g_file_test (const gchar *filename,
#endif
}
if (test & (G_FILE_TEST_IS_REGULAR | G_FILE_TEST_IS_DIR))
if (test & (G_FILE_TEST_IS_REGULAR |
G_FILE_TEST_IS_DIR |
G_FILE_TEST_IS_EXECUTABLE))
{
struct stat s;
@ -119,6 +155,15 @@ g_file_test (const gchar *filename,
if ((test & G_FILE_TEST_IS_DIR) && S_ISDIR (s.st_mode))
return TRUE;
/* The extra test for root when access (file, X_OK) succeeds.
*/
if ((test & G_FILE_TEST_IS_EXECUTABLE) &&
((s.st_mode & S_IXOTH) ||
(s.st_mode & S_IXUSR) ||
(s.st_mode & S_IXGRP)))
return TRUE;
}
}