diff options
| author | Hannes Frederic Sowa <hannes@stressinduktion.org> | 2016-02-03 04:11:03 +0300 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2016-02-27 17:28:49 +0300 |
| commit | 5ea820046ee399214221c0bb817eb35d304c9604 (patch) | |
| tree | b80a7bdd2a43cb841f0a3015c39f636282e9f190 /net/sched/sch_teql.c | |
| parent | a5a6cf8c405e826ff7ed1308dde72560c0ed4854 (diff) | |
| download | linux-5ea820046ee399214221c0bb817eb35d304c9604.tar.xz | |
unix: correctly track in-flight fds in sending process user_struct
commit 415e3d3e90ce9e18727e8843ae343eda5a58fad6 upstream.
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>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'net/sched/sch_teql.c')
0 files changed, 0 insertions, 0 deletions