59 lines
2.0 KiB
Diff
59 lines
2.0 KiB
Diff
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Fix CVE-2020-12049:
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12049
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https://lists.freedesktop.org/archives/ftp-release/2020-June/000753.html
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Taken from upstream:
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https://gitlab.freedesktop.org/dbus/dbus/-/commit/272d484283883fa9ff95b69d924fff6cd34842f5
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diff --git a/dbus/dbus-sysdeps-unix.c b/dbus/dbus-sysdeps-unix.c
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--- a/dbus/dbus-sysdeps-unix.c
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+++ b/dbus/dbus-sysdeps-unix.c
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@@ -435,18 +435,6 @@ _dbus_read_socket_with_unix_fds (DBusSocket fd,
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struct cmsghdr *cm;
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dbus_bool_t found = FALSE;
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- if (m.msg_flags & MSG_CTRUNC)
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- {
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- /* Hmm, apparently the control data was truncated. The bad
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- thing is that we might have completely lost a couple of fds
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- without chance to recover them. Hence let's treat this as a
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- serious error. */
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-
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- errno = ENOSPC;
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- _dbus_string_set_length (buffer, start);
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- return -1;
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- }
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-
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for (cm = CMSG_FIRSTHDR(&m); cm; cm = CMSG_NXTHDR(&m, cm))
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if (cm->cmsg_level == SOL_SOCKET && cm->cmsg_type == SCM_RIGHTS)
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{
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@@ -501,6 +489,26 @@ _dbus_read_socket_with_unix_fds (DBusSocket fd,
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if (!found)
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*n_fds = 0;
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+ if (m.msg_flags & MSG_CTRUNC)
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+ {
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+ unsigned int i;
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+
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+ /* Hmm, apparently the control data was truncated. The bad
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+ thing is that we might have completely lost a couple of fds
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+ without chance to recover them. Hence let's treat this as a
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+ serious error. */
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+
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+ /* We still need to close whatever fds we *did* receive,
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+ * otherwise they'll never get closed. (CVE-2020-12049) */
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+ for (i = 0; i < *n_fds; i++)
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+ close (fds[i]);
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+
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+ *n_fds = 0;
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+ errno = ENOSPC;
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+ _dbus_string_set_length (buffer, start);
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+ return -1;
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+ }
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+
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/* put length back (doesn't actually realloc) */
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_dbus_string_set_length (buffer, start + bytes_read);
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