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Date: Fri, 14 Mar 2008 14:20:57 -0400
From: Theodore Ts'o <tytso@....edu>
To: linux-ext4@...r.kernel.org
Cc: Matthias Koenig <mkoenig@...e.de>, "Theodore Ts'o" <tytso@....edu>
Subject: [PATCH] uuidd: Fix issues identified by SuSE's security team
From: Matthias Koenig <mkoenig@...e.de>
SuSE's security team audited uuidd and came up with these issues.
None of them are serious given that uuidd runs setuid as a
unprivileged user which has no special access other than libuuid
directory, but it's good to get them fixed.
Signed-off-by: Matthias Koenig <mkoenig@...e.de>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
misc/uuidd.c | 44 +++++++++++++++++++++++++++++---------------
1 files changed, 29 insertions(+), 15 deletions(-)
diff --git a/misc/uuidd.c b/misc/uuidd.c
index 1b2dedd..c964b4e 100644
--- a/misc/uuidd.c
+++ b/misc/uuidd.c
@@ -52,6 +52,12 @@ static void usage(const char *progname)
exit(1);
}
+static void die(const char *msg)
+{
+ perror(msg);
+ exit(1);
+}
+
static void create_daemon(void)
{
pid_t pid;
@@ -75,7 +81,8 @@ static void create_daemon(void)
chdir("/");
(void) setsid();
euid = geteuid();
- (void) setreuid(euid, euid);
+ if (setreuid(euid, euid) < 0)
+ die("setreuid");
}
static int read_all(int fd, char *buf, size_t count)
@@ -132,7 +139,8 @@ static int call_daemon(const char *socket_path, int op, char *buf,
}
srv_addr.sun_family = AF_UNIX;
- strcpy(srv_addr.sun_path, socket_path);
+ strncpy(srv_addr.sun_path, socket_path, sizeof(srv_addr.sun_path));
+ srv_addr.sun_path[sizeof(srv_addr.sun_path)-1] = '\0';
if (connect(s, (const struct sockaddr *) &srv_addr,
sizeof(struct sockaddr_un)) < 0) {
@@ -252,7 +260,8 @@ static void server_loop(const char *socket_path, const char *pidfile_path,
* Create the address we will be binding to.
*/
my_addr.sun_family = AF_UNIX;
- strcpy(my_addr.sun_path, socket_path);
+ strncpy(my_addr.sun_path, socket_path, sizeof(my_addr.sun_path));
+ my_addr.sun_path[sizeof(my_addr.sun_path)-1] = '\0';
(void) unlink(socket_path);
save_umask = umask(0);
if (bind(s, (const struct sockaddr *) &my_addr,
@@ -415,11 +424,11 @@ int main(int argc, char **argv)
switch (c) {
case 'd':
debug++;
- drop_privs++;
+ drop_privs = 1;
break;
case 'k':
do_kill++;
- drop_privs++;
+ drop_privs = 1;
break;
case 'n':
num = strtol(optarg, &tmp, 0);
@@ -429,18 +438,18 @@ int main(int argc, char **argv)
}
case 'p':
pidfile_path = optarg;
- drop_privs++;
+ drop_privs = 1;
break;
case 'q':
quiet++;
break;
case 's':
socket_path = optarg;
- drop_privs++;
+ drop_privs = 1;
break;
case 't':
do_type = UUIDD_OP_TIME_UUID;
- drop_privs++;
+ drop_privs = 1;
break;
case 'T':
timeout = strtol(optarg, &tmp, 0);
@@ -451,7 +460,7 @@ int main(int argc, char **argv)
break;
case 'r':
do_type = UUIDD_OP_RANDOM_UUID;
- drop_privs++;
+ drop_privs = 1;
break;
default:
usage(argv[0]);
@@ -460,15 +469,20 @@ int main(int argc, char **argv)
uid = getuid();
if (uid && drop_privs) {
gid = getgid();
-#ifdef HAVE_SETRESUID
- setresuid(uid, uid, uid);
+#ifdef HAVE_SETRESGID
+ if (setresgid(gid, gid, gid) < 0)
+ die("setresgid");
#else
- setreuid(uid, uid);
+ if (setregid(gid, gid) < 0)
+ die("setregid");
#endif
-#ifdef HAVE_SETRESGID
- setresgid(gid, gid, gid);
+
+#ifdef HAVE_SETRESUID
+ if (setresuid(uid, uid, uid) < 0)
+ die("setresuid");
#else
- setregid(gid, gid);
+ if (setreuid(uid, uid) < 0)
+ die("setreuid");
#endif
}
if (num && do_type) {
--
1.5.4.1.144.gdfee-dirty
--
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