#include <unistd.h>
#include <stddef.h>
#include <sys/epoll.h>
+#include <sys/mman.h>
#include "socket-util.h"
#include "path-util.h"
#include "journald-console.h"
#include "journald-syslog.h"
#include "journald-wall.h"
+#include "memfd-util.h"
bool valid_user_field(const char *p, size_t l, bool allow_protected) {
const char *a;
return true;
}
-static bool allow_object_pid(struct ucred *ucred) {
+static bool allow_object_pid(const struct ucred *ucred) {
return ucred && ucred->uid == 0;
}
void server_process_native_message(
Server *s,
const void *buffer, size_t buffer_size,
- struct ucred *ucred,
- struct timeval *tv,
+ const struct ucred *ucred,
+ const struct timeval *tv,
const char *label, size_t label_len) {
struct iovec *iovec = NULL;
/* A property follows */
- /* n received properties, +1 for _TRANSPORT */
- if (!GREEDY_REALLOC(iovec, m, n + 1 + N_IOVEC_META_FIELDS + !!object_pid * N_IOVEC_OBJECT_FIELDS)) {
+ /* n existing properties, 1 new, +1 for _TRANSPORT */
+ if (!GREEDY_REALLOC(iovec, m, n + 2 + N_IOVEC_META_FIELDS + N_IOVEC_OBJECT_FIELDS)) {
log_oom();
break;
}
void server_process_native_file(
Server *s,
int fd,
- struct ucred *ucred,
- struct timeval *tv,
+ const struct ucred *ucred,
+ const struct timeval *tv,
const char *label, size_t label_len) {
struct stat st;
- _cleanup_free_ void *p = NULL;
- ssize_t n;
+ bool sealed;
int r;
+ /* Data is in the passed fd, since it didn't fit in a
+ * datagram. */
+
assert(s);
assert(fd >= 0);
- if (!ucred || ucred->uid != 0) {
+ /* If it's a memfd, check if it is sealed. If so, we can just
+ * use map it and use it, and do not need to copy the data
+ * out. */
+ sealed = memfd_get_sealed(fd) > 0;
+
+ if (!sealed && (!ucred || ucred->uid != 0)) {
_cleanup_free_ char *sl = NULL, *k = NULL;
const char *e;
+ /* If this is not a sealed memfd, and the peer is unknown or
+ * unprivileged, then verify the path. */
+
if (asprintf(&sl, "/proc/self/fd/%i", fd) < 0) {
log_oom();
return;
r = readlink_malloc(sl, &k);
if (r < 0) {
- log_error("readlink(%s) failed: %m", sl);
+ log_error_errno(errno, "readlink(%s) failed: %m", sl);
return;
}
return;
}
- if (!filename_is_safe(e)) {
+ if (!filename_is_valid(e)) {
log_error("Received file in subdirectory of allowed directories. Refusing.");
return;
}
}
- /* Data is in the passed file, since it didn't fit in a
- * datagram. We can't map the file here, since clients might
- * then truncate it and trigger a SIGBUS for us. So let's
- * stupidly read it */
-
if (fstat(fd, &st) < 0) {
- log_error("Failed to stat passed file, ignoring: %m");
+ log_error_errno(errno, "Failed to stat passed file, ignoring: %m");
return;
}
return;
}
- p = malloc(st.st_size);
- if (!p) {
- log_oom();
- return;
- }
+ if (sealed) {
+ void *p;
+ size_t ps;
+
+ /* The file is sealed, we can just map it and use it. */
- n = pread(fd, p, st.st_size, 0);
- if (n < 0)
- log_error("Failed to read file, ignoring: %s", strerror(-n));
- else if (n > 0)
- server_process_native_message(s, p, n, ucred, tv, label, label_len);
+ ps = PAGE_ALIGN(st.st_size);
+ p = mmap(NULL, ps, PROT_READ, MAP_PRIVATE, fd, 0);
+ if (p == MAP_FAILED) {
+ log_error_errno(errno, "Failed to map memfd, ignoring: %m");
+ return;
+ }
+
+ server_process_native_message(s, p, st.st_size, ucred, tv, label, label_len);
+ assert_se(munmap(p, ps) >= 0);
+ } else {
+ _cleanup_free_ void *p = NULL;
+ ssize_t n;
+
+ /* The file is not sealed, we can't map the file here, since
+ * clients might then truncate it and trigger a SIGBUS for
+ * us. So let's stupidly read it */
+
+ p = malloc(st.st_size);
+ if (!p) {
+ log_oom();
+ return;
+ }
+
+ n = pread(fd, p, st.st_size, 0);
+ if (n < 0)
+ log_error_errno(n, "Failed to read file, ignoring: %m");
+ else if (n > 0)
+ server_process_native_message(s, p, n, ucred, tv, label, label_len);
+ }
}
int server_open_native_socket(Server*s) {
- int one, r;
+ static const int one = 1;
+ int r;
assert(s);
};
s->native_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
- if (s->native_fd < 0) {
- log_error("socket() failed: %m");
- return -errno;
- }
+ if (s->native_fd < 0)
+ return log_error_errno(errno, "socket() failed: %m");
unlink(sa.un.sun_path);
r = bind(s->native_fd, &sa.sa, offsetof(union sockaddr_union, un.sun_path) + strlen(sa.un.sun_path));
- if (r < 0) {
- log_error("bind(%s) failed: %m", sa.un.sun_path);
- return -errno;
- }
+ if (r < 0)
+ return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
chmod(sa.un.sun_path, 0666);
} else
fd_nonblock(s->native_fd, 1);
- one = 1;
r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
- if (r < 0) {
- log_error("SO_PASSCRED failed: %m");
- return -errno;
- }
+ if (r < 0)
+ return log_error_errno(errno, "SO_PASSCRED failed: %m");
#ifdef HAVE_SELINUX
- if (use_selinux()) {
- one = 1;
+ if (mac_selinux_use()) {
r = setsockopt(s->native_fd, SOL_SOCKET, SO_PASSSEC, &one, sizeof(one));
if (r < 0)
- log_warning("SO_PASSSEC failed: %m");
+ log_warning_errno(errno, "SO_PASSSEC failed: %m");
}
#endif
- one = 1;
r = setsockopt(s->native_fd, SOL_SOCKET, SO_TIMESTAMP, &one, sizeof(one));
- if (r < 0) {
- log_error("SO_TIMESTAMP failed: %m");
- return -errno;
- }
+ if (r < 0)
+ return log_error_errno(errno, "SO_TIMESTAMP failed: %m");
r = sd_event_add_io(s->event, &s->native_event_source, s->native_fd, EPOLLIN, process_datagram, s);
- if (r < 0) {
- log_error("Failed to add native server fd to event loop: %s", strerror(-r));
- return r;
- }
+ if (r < 0)
+ return log_error_errno(r, "Failed to add native server fd to event loop: %m");
return 0;
}
~ianmdlvl / elogind.git / blobdiff