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-rw-r--r--pkg/rootless/rootless_linux.c203
1 files changed, 97 insertions, 106 deletions
diff --git a/pkg/rootless/rootless_linux.c b/pkg/rootless/rootless_linux.c
index 6ce4b1e29..b60aea855 100644
--- a/pkg/rootless/rootless_linux.c
+++ b/pkg/rootless/rootless_linux.c
@@ -19,6 +19,33 @@
#include <sys/select.h>
#include <stdio.h>
+#define cleanup_free __attribute__ ((cleanup (cleanup_freep)))
+#define cleanup_close __attribute__ ((cleanup (cleanup_closep)))
+#define cleanup_dir __attribute__ ((cleanup (cleanup_dirp)))
+
+static inline void
+cleanup_freep (void *p)
+{
+ void **pp = (void **) p;
+ free (*pp);
+}
+
+static inline void
+cleanup_closep (void *p)
+{
+ int *pp = p;
+ if (*pp >= 0)
+ TEMP_FAILURE_RETRY (close (*pp));
+}
+
+static inline void
+cleanup_dirp (DIR **p)
+{
+ DIR *dir = *p;
+ if (dir)
+ closedir (dir);
+}
+
int rename_noreplace (int olddirfd, const char *oldpath, int newdirfd, const char *newpath)
{
int ret;
@@ -114,8 +141,8 @@ do_pause ()
static char **
get_cmd_line_args ()
{
- int fd;
- char *buffer;
+ cleanup_free char *buffer = NULL;
+ cleanup_close int fd = -1;
size_t allocated;
size_t used = 0;
int ret;
@@ -134,10 +161,7 @@ get_cmd_line_args ()
{
ret = TEMP_FAILURE_RETRY (read (fd, buffer + used, allocated - used));
if (ret < 0)
- {
- free (buffer);
- return NULL;
- }
+ return NULL;
if (ret == 0)
break;
@@ -148,30 +172,21 @@ get_cmd_line_args ()
allocated += 512;
char *tmp = realloc (buffer, allocated);
if (tmp == NULL)
- {
- free (buffer);
- return NULL;
- }
+ return NULL;
buffer = tmp;
}
}
- close (fd);
for (i = 0; i < used; i++)
if (buffer[i] == '\0')
argc++;
if (argc == 0)
- {
- free (buffer);
- return NULL;
- }
+ return NULL;
argv = malloc (sizeof (char *) * (argc + 1));
if (argv == NULL)
- {
- free (buffer);
- return NULL;
- }
+ return NULL;
+
argc = 0;
argv[argc++] = buffer;
@@ -181,15 +196,19 @@ get_cmd_line_args ()
argv[argc] = NULL;
+ /* Move ownership. */
+ buffer = NULL;
+
return argv;
}
static bool
can_use_shortcut ()
{
- int argc;
- char **argv;
+ cleanup_free char **argv = NULL;
+ cleanup_free char *argv0 = NULL;
bool ret = true;
+ int argc;
#ifdef DISABLE_JOIN_SHORTCUT
return false;
@@ -199,12 +218,10 @@ can_use_shortcut ()
if (argv == NULL)
return false;
+ argv0 = argv[0];
+
if (strstr (argv[0], "podman") == NULL)
- {
- free (argv[0]);
- free (argv);
- return false;
- }
+ return false;
for (argc = 0; argv[argc]; argc++)
{
@@ -229,8 +246,6 @@ can_use_shortcut ()
}
}
- free (argv[0]);
- free (argv);
return ret;
}
@@ -250,8 +265,7 @@ static void __attribute__((constructor)) init()
const char *listen_pid;
const char *listen_fds;
const char *listen_fdnames;
-
- DIR *d;
+ cleanup_dir DIR *d = NULL;
pause = getenv ("_PODMAN_PAUSE");
if (pause && pause[0])
@@ -299,7 +313,6 @@ static void __attribute__((constructor)) init()
FD_SET (fd % FD_SETSIZE, &(open_files_set[fd / FD_SETSIZE]));
}
- closedir (d);
}
listen_pid = getenv("LISTEN_PID");
@@ -327,19 +340,22 @@ static void __attribute__((constructor)) init()
xdg_runtime_dir = getenv ("XDG_RUNTIME_DIR");
if (geteuid () != 0 && xdg_runtime_dir && xdg_runtime_dir[0] && can_use_shortcut ())
{
- int r;
- int fd;
+ cleanup_free char *cwd = NULL;
+ cleanup_close int userns_fd = -1;
+ cleanup_close int mntns_fd = -1;
+ cleanup_close int fd = -1;
long pid;
char buf[12];
uid_t uid;
gid_t gid;
char path[PATH_MAX];
const char *const suffix = "/libpod/tmp/pause.pid";
- char *cwd = getcwd (NULL, 0);
char uid_fmt[16];
char gid_fmt[16];
size_t len;
+ int r;
+ cwd = getcwd (NULL, 0);
if (cwd == NULL)
{
fprintf (stderr, "error getting current working directory: %s\n", strerror (errno));
@@ -355,45 +371,40 @@ static void __attribute__((constructor)) init()
fd = open (path, O_RDONLY);
if (fd < 0)
- {
- free (cwd);
- return;
- }
+ return;
r = TEMP_FAILURE_RETRY (read (fd, buf, sizeof (buf) - 1));
- close (fd);
+
if (r < 0)
- {
- free (cwd);
- return;
- }
+ return;
buf[r] = '\0';
pid = strtol (buf, NULL, 10);
if (pid == LONG_MAX)
- {
- free (cwd);
- return;
- }
+ return;
uid = geteuid ();
gid = getegid ();
sprintf (path, "/proc/%ld/ns/user", pid);
- fd = open (path, O_RDONLY);
- if (fd < 0 || setns (fd, 0) < 0)
- {
- free (cwd);
- return;
- }
- close (fd);
+ userns_fd = open (path, O_RDONLY);
+ if (userns_fd < 0)
+ return;
- /* Errors here cannot be ignored as we already joined a ns. */
sprintf (path, "/proc/%ld/ns/mnt", pid);
- fd = open (path, O_RDONLY);
- if (fd < 0)
+ mntns_fd = open (path, O_RDONLY);
+ if (mntns_fd < 0)
+ return;
+
+ if (setns (userns_fd, 0) < 0)
+ return;
+
+ /* The user namespace was joined, after this point errors are
+ not recoverable anymore. */
+
+ if (setns (mntns_fd, 0) < 0)
{
- fprintf (stderr, "cannot open %s: %s", path, strerror (errno));
+ fprintf (stderr, "cannot join mount namespace for %ld: %s", pid, strerror (errno));
exit (EXIT_FAILURE);
}
@@ -404,14 +415,6 @@ static void __attribute__((constructor)) init()
setenv ("_CONTAINERS_ROOTLESS_UID", uid_fmt, 1);
setenv ("_CONTAINERS_ROOTLESS_GID", gid_fmt, 1);
- r = setns (fd, 0);
- if (r < 0)
- {
- fprintf (stderr, "cannot join mount namespace for %ld: %s", pid, strerror (errno));
- exit (EXIT_FAILURE);
- }
- close (fd);
-
if (syscall_setresgid (0, 0, 0) < 0)
{
fprintf (stderr, "cannot setresgid: %s\n", strerror (errno));
@@ -430,7 +433,6 @@ static void __attribute__((constructor)) init()
_exit (EXIT_FAILURE);
}
- free (cwd);
rootless_uid_init = uid;
rootless_gid_init = gid;
}
@@ -619,15 +621,17 @@ join_namespace_or_die (const char *name, int ns_fd)
int
reexec_userns_join (int pid_to_join, char *pause_pid_file_path)
{
+ cleanup_close int userns_fd = -1;
+ cleanup_close int mntns_fd = -1;
+ cleanup_free char *cwd = NULL;
char uid[16];
char gid[16];
- char **argv;
+ cleanup_free char *argv0 = NULL;
+ cleanup_free char **argv = NULL;
int pid;
- int mnt_ns = -1;
- int user_ns = -1;
- char *cwd = getcwd (NULL, 0);
sigset_t sigset, oldsigset;
+ cwd = getcwd (NULL, 0);
if (cwd == NULL)
{
fprintf (stderr, "error getting current working directory: %s\n", strerror (errno));
@@ -644,15 +648,14 @@ reexec_userns_join (int pid_to_join, char *pause_pid_file_path)
_exit (EXIT_FAILURE);
}
- user_ns = open_namespace (pid_to_join, "user");
- if (user_ns < 0)
- return user_ns;
- mnt_ns = open_namespace (pid_to_join, "mnt");
- if (mnt_ns < 0)
- {
- close (user_ns);
- return mnt_ns;
- }
+ argv0 = argv[0];
+
+ userns_fd = open_namespace (pid_to_join, "user");
+ if (userns_fd < 0)
+ return userns_fd;
+ mntns_fd = open_namespace (pid_to_join, "mnt");
+ if (mntns_fd < 0)
+ return mntns_fd;
pid = fork ();
if (pid < 0)
@@ -662,10 +665,6 @@ reexec_userns_join (int pid_to_join, char *pause_pid_file_path)
{
int f;
- /* We passed down these fds, close them. */
- close (user_ns);
- close (mnt_ns);
-
for (f = 3; f <= open_files_max_fd; f++)
if (is_fd_inherited (f))
close (f);
@@ -721,10 +720,8 @@ reexec_userns_join (int pid_to_join, char *pause_pid_file_path)
_exit (EXIT_FAILURE);
}
- join_namespace_or_die ("user", user_ns);
- join_namespace_or_die ("mnt", mnt_ns);
- close (user_ns);
- close (mnt_ns);
+ join_namespace_or_die ("user", userns_fd);
+ join_namespace_or_die ("mnt", mntns_fd);
if (syscall_setresgid (0, 0, 0) < 0)
{
@@ -743,7 +740,6 @@ reexec_userns_join (int pid_to_join, char *pause_pid_file_path)
fprintf (stderr, "cannot chdir to %s: %s\n", cwd, strerror (errno));
_exit (EXIT_FAILURE);
}
- free (cwd);
if (pause_pid_file_path && pause_pid_file_path[0] != '\0')
{
@@ -784,7 +780,7 @@ static int
copy_file_to_fd (const char *file_to_read, int outfd)
{
char buf[512];
- int fd;
+ cleanup_close int fd = -1;
fd = open (file_to_read, O_RDONLY);
if (fd < 0)
@@ -796,10 +792,7 @@ copy_file_to_fd (const char *file_to_read, int outfd)
r = TEMP_FAILURE_RETRY (read (fd, buf, sizeof buf));
if (r < 0)
- {
- close (fd);
- return r;
- }
+ return r;
if (r == 0)
break;
@@ -808,36 +801,33 @@ copy_file_to_fd (const char *file_to_read, int outfd)
{
w = TEMP_FAILURE_RETRY (write (outfd, &buf[t], r - t));
if (w < 0)
- {
- close (fd);
- return w;
- }
+ return w;
t += w;
}
}
- close (fd);
return 0;
}
int
reexec_in_user_namespace (int ready, char *pause_pid_file_path, char *file_to_read, int outputfd)
{
+ cleanup_free char **argv = NULL;
+ cleanup_free char *argv0 = NULL;
+ cleanup_free char *cwd = NULL;
+ sigset_t sigset, oldsigset;
int ret;
pid_t pid;
char b;
- char **argv;
char uid[16];
char gid[16];
- char *cwd = getcwd (NULL, 0);
- sigset_t sigset, oldsigset;
+ cwd = getcwd (NULL, 0);
if (cwd == NULL)
{
fprintf (stderr, "error getting current working directory: %s\n", strerror (errno));
_exit (EXIT_FAILURE);
}
-
sprintf (uid, "%d", geteuid ());
sprintf (gid, "%d", getegid ());
@@ -898,6 +888,8 @@ reexec_in_user_namespace (int ready, char *pause_pid_file_path, char *file_to_re
_exit (EXIT_FAILURE);
}
+ argv0 = argv[0];
+
if (do_socket_activation)
{
char s[32];
@@ -942,7 +934,6 @@ reexec_in_user_namespace (int ready, char *pause_pid_file_path, char *file_to_re
TEMP_FAILURE_RETRY (write (ready, "1", 1));
_exit (EXIT_FAILURE);
}
- free (cwd);
if (pause_pid_file_path && pause_pid_file_path[0] != '\0')
{
@@ -956,8 +947,8 @@ reexec_in_user_namespace (int ready, char *pause_pid_file_path, char *file_to_re
ret = TEMP_FAILURE_RETRY (write (ready, "0", 1));
if (ret < 0)
{
- fprintf (stderr, "cannot write to ready pipe: %s\n", strerror (errno));
- _exit (EXIT_FAILURE);
+ fprintf (stderr, "cannot write to ready pipe: %s\n", strerror (errno));
+ _exit (EXIT_FAILURE);
}
close (ready);
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-12-24 18:33:41 +0000