X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fjournal%2Fjournal-send.c;h=887b957c4d3751c14287f374b679ecb6903226b1;hb=8ee8e53648bf45854d92b60e1e70c17a0cec3c3d;hp=bb1ef66dc9e8555c509831f1e61d9914c461b3be;hpb=61c024b328d5493a334242a4d01ba923582093fa;p=elogind.git

diff --git a/src/journal/journal-send.c b/src/journal/journal-send.c
index bb1ef66dc..887b957c4 100644
--- a/src/journal/journal-send.c
+++ b/src/journal/journal-send.c
@@ -32,6 +32,7 @@
 #include "sd-journal.h"
 #include "util.h"
 #include "socket-util.h"
+#include "memfd-util.h"
 
 #define SNDBUF_SIZE (8*1024*1024)
 
@@ -198,7 +199,7 @@ finish:
 
 _public_ int sd_journal_sendv(const struct iovec *iov, int n) {
         PROTECT_ERRNO;
-        int fd;
+        int fd, r;
         _cleanup_close_ int buffer_fd = -1;
         struct iovec *w;
         uint64_t *l;
@@ -218,6 +219,7 @@ _public_ int sd_journal_sendv(const struct iovec *iov, int n) {
         } control;
         struct cmsghdr *cmsg;
         bool have_syslog_identifier = false;
+        bool seal = true;
 
         assert_return(iov, -EINVAL);
         assert_return(n > 0, -EINVAL);
@@ -304,21 +306,36 @@ _public_ int sd_journal_sendv(const struct iovec *iov, int n) {
         if (errno != EMSGSIZE && errno != ENOBUFS)
                 return -errno;
 
-        /* Message doesn't fit... Let's dump the data in a temporary
-         * file and just pass a file descriptor of it to the other
-         * side.
+        /* Message doesn't fit... Let's dump the data in a memfd or
+         * temporary file and just pass a file descriptor of it to the
+         * other side.
          *
-         * We use /dev/shm instead of /tmp here, since we want this to
-         * be a tmpfs, and one that is available from early boot on
-         * and where unprivileged users can create files. */
-        buffer_fd = open_tmpfile("/dev/shm", O_RDWR | O_CLOEXEC);
-        if (buffer_fd < 0)
-                return buffer_fd;
+         * For the temporary files we use /dev/shm instead of /tmp
+         * here, since we want this to be a tmpfs, and one that is
+         * available from early boot on and where unprivileged users
+         * can create files. */
+        buffer_fd = memfd_new(NULL);
+        if (buffer_fd < 0) {
+                if (buffer_fd == -ENOSYS) {
+                        buffer_fd = open_tmpfile("/dev/shm", O_RDWR | O_CLOEXEC);
+                        if (buffer_fd < 0)
+                                return buffer_fd;
+
+                        seal = false;
+                } else
+                        return buffer_fd;
+        }
 
         n = writev(buffer_fd, w, j);
         if (n < 0)
                 return -errno;
 
+        if (seal) {
+                r = memfd_set_sealed(buffer_fd);
+                if (r < 0)
+                        return r;
+        }
+
         mh.msg_iov = NULL;
         mh.msg_iovlen = 0;