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* NEWS, libmisc/chowntty.c: Fix a race condition that could lead to

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gaining ownership or changing mode of arbitrary files.
This commit is contained in:
nekral-guest 2008-11-22 23:22:16 +00:00
parent 8d7e1faebf
commit eb4097180b
3 changed files with 16 additions and 5 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2008-11-23 Nicolas François <nicolas.francois@centraliens.net>
* NEWS, libmisc/chowntty.c: Fix a race condition that could lead to
gaining ownership or changing mode of arbitrary files.
2008-10-11 Nicolas François <nicolas.francois@centraliens.net>
* man/gshadow.5.xml, man/shadow.5.xml, man/passwd.5.xml,

8
NEWS
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@ -1,6 +1,6 @@
$Id$
shadow-4.1.2.1 -> shadow-4.1.3 UNRELEASED
shadow-4.1.2.2 -> shadow-4.1.3 UNRELEASED
*** general:
- packaging
@ -59,6 +59,12 @@ shadow-4.1.2.1 -> shadow-4.1.3 UNRELEASED
* Allow adding LDAP users (or any user not present in the local passwd
file) to local groups
shadow-4.1.2.1 -> shadow-4.1.2.2 23-11-2008
*** security
- Fix a race condition in login that could lead to gaining ownership or
changing mode of arbitrary files.
shadow-4.1.2 -> shadow-4.1.2.1 26-06-2008
*** security

8
libmisc/chowntty.c
View File

@ -109,14 +109,14 @@ void chown_tty (const char *tty, const struct passwd *info)
exit (1);
}
if ( (chown (tty, info->pw_uid, gid) != 0)
|| (chmod (tty, getdef_num ("TTYPERM", 0600)) != 0)) {
if ( (fchown (STDIN_FILENO, info->pw_uid, gid) != 0)
|| (fchmod (STDIN_FILENO, getdef_num ("TTYPERM", 0600)) != 0)) {
int err = errno;
snprintf (buf, sizeof buf, _("Unable to change tty %s"), tty);
snprintf (buf, sizeof buf, _("Unable to change tty stdin"));
perror (buf);
SYSLOG ((LOG_WARN,
"unable to change tty `%s' for user `%s'\n", tty,
"unable to change tty stdin for user `%s'\n",
info->pw_name));
closelog ();