diff options
| author | Hannes Frederic Sowa <hannes@stressinduktion.org> | 2016-02-03 02:11:03 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-02-08 10:30:42 -0500 |
| commit | 415e3d3e90ce9e18727e8843ae343eda5a58fad6 (patch) | |
| tree | 529751765d40af6f6cfcafdc1c92b1dcafb5c8da /include/net/scm.h | |
| parent | aa7b45378059a3eba1529d76f6d0b367ba614646 (diff) | |
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.h | 1 |
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]; }; |