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authorKees Cook <kees@ubuntu.com>2010-03-02 21:33:34 -0800
committerLennart Poettering <lennart@poettering.net>2010-03-04 04:17:23 +0100
commitd3efa43d85ac132c6a5a416a2b6f2115f5d577ee (patch)
treee7f2416587fe9d0981bb516bd280ac4258dac222
parent0d1154d078f8f149e2ab9a67b09835a829416e49 (diff)
core-util: ensure that we chmod only the dir we ourselves created
-rw-r--r--configure.ac2
-rw-r--r--src/pulsecore/core-util.c39
2 files changed, 35 insertions, 6 deletions
diff --git a/configure.ac b/configure.ac
index 1b807880..abcce13f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -424,7 +424,7 @@ AC_CHECK_FUNCS_ONCE([lrintf strtof])
AC_FUNC_FORK
AC_FUNC_GETGROUPS
AC_FUNC_SELECT_ARGTYPES
-AC_CHECK_FUNCS_ONCE([chmod chown clock_gettime getaddrinfo getgrgid_r getgrnam_r \
+AC_CHECK_FUNCS_ONCE([chmod chown fstat fchown fchmod clock_gettime getaddrinfo getgrgid_r getgrnam_r \
getpwnam_r getpwuid_r gettimeofday getuid inet_ntop inet_pton mlock nanosleep \
pipe posix_fadvise posix_madvise posix_memalign setpgid setsid shm_open \
sigaction sleep sysconf pthread_setaffinity_np])
diff --git a/src/pulsecore/core-util.c b/src/pulsecore/core-util.c
index d6017b9d..a6425532 100644
--- a/src/pulsecore/core-util.c
+++ b/src/pulsecore/core-util.c
@@ -199,7 +199,7 @@ void pa_make_fd_cloexec(int fd) {
/** Creates a directory securely */
int pa_make_secure_dir(const char* dir, mode_t m, uid_t uid, gid_t gid) {
struct stat st;
- int r, saved_errno;
+ int r, saved_errno, fd;
pa_assert(dir);
@@ -217,16 +217,45 @@ int pa_make_secure_dir(const char* dir, mode_t m, uid_t uid, gid_t gid) {
if (r < 0 && errno != EEXIST)
return -1;
-#ifdef HAVE_CHOWN
+#ifdef HAVE_FSTAT
+ if ((fd = open(dir,
+#ifdef O_CLOEXEC
+ O_CLOEXEC|
+#endif
+#ifdef O_NOCTTY
+ O_NOCTTY|
+#endif
+#ifdef O_NOFOLLOW
+ O_NOFOLLOW|
+#endif
+ O_RDONLY)) < 0)
+ goto fail;
+
+ if (fstat(fd, &st) < 0) {
+ pa_assert_se(pa_close(fd) >= 0);
+ goto fail;
+ }
+
+ if (!S_ISDIR(st.st_mode)) {
+ pa_assert_se(pa_close(fd) >= 0);
+ errno = EEXIST;
+ goto fail;
+ }
+
+#ifdef HAVE_FCHOWN
if (uid == (uid_t)-1)
uid = getuid();
if (gid == (gid_t)-1)
gid = getgid();
- (void) chown(dir, uid, gid);
+ (void) fchown(fd, uid, gid);
+#endif
+
+#ifdef HAVE_FCHMOD
+ (void) fchmod(fd, m);
#endif
-#ifdef HAVE_CHMOD
- chmod(dir, m);
+ pa_assert_se(pa_close(fd) >= 0);
+
#endif
#ifdef HAVE_LSTAT