summary refs log tree commit diff
path: root/include/net/scm.h
diff options
context:
space:
mode:
authorHannes Frederic Sowa <hannes@stressinduktion.org>2016-02-03 02:11:03 +0100
committerDavid S. Miller <davem@davemloft.net>2016-02-08 10:30:42 -0500
commit415e3d3e90ce9e18727e8843ae343eda5a58fad6 (patch)
tree529751765d40af6f6cfcafdc1c92b1dcafb5c8da /include/net/scm.h
parentaa7b45378059a3eba1529d76f6d0b367ba614646 (diff)
downloadlinux-415e3d3e90ce9e18727e8843ae343eda5a58fad6.tar.gz
unix: correctly track in-flight fds in sending process user_struct
The commit referenced in the Fixes tag incorrectly accounted the number
of in-flight fds over a unix domain socket to the original opener
of the file-descriptor. This allows another process to arbitrary
deplete the original file-openers resource limit for the maximum of
open files. Instead the sending processes and its struct cred should
be credited.

To do so, we add a reference counted struct user_struct pointer to the
scm_fp_list and use it to account for the number of inflight unix fds.

Fixes: 712f4aad406bb1 ("unix: properly account for FDs passed over unix sockets")
Reported-by: David Herrmann <dh.herrmann@gmail.com>
Cc: David Herrmann <dh.herrmann@gmail.com>
Cc: Willy Tarreau <w@1wt.eu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/scm.h')
-rw-r--r--include/net/scm.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/scm.h b/include/net/scm.h
index 262532d111f5..59fa93c01d2a 100644
--- a/include/net/scm.h
+++ b/include/net/scm.h
@@ -21,6 +21,7 @@ struct scm_creds {
 struct scm_fp_list {
 	short			count;
 	short			max;
+	struct user_struct	*user;
 	struct file		*fp[SCM_MAX_FD];
 };