linux/net/9p
Dominique Martinet 574d356b7a 9p/net: put a lower bound on msize
If the requested msize is too small (either from command line argument
or from the server version reply), we won't get any work done.
If it's *really* too small, nothing will work, and this got caught by
syzbot recently (on a new kmem_cache_create_usercopy() call)

Just set a minimum msize to 4k in both code paths, until someone
complains they have a use-case for a smaller msize.

We need to check in both mount option and server reply individually
because the msize for the first version request would be unchecked
with just a global check on clnt->msize.

Link: http://lkml.kernel.org/r/1541407968-31350-1-git-send-email-asmadeus@codewreck.org
Reported-by: syzbot+0c1d61e4db7db94102ca@syzkaller.appspotmail.com
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Cc: stable@vger.kernel.org
2018-12-25 17:07:49 +09:00
..
Kconfig IB: Revert "remove redundant INFINIBAND kconfig dependencies" 2018-05-28 10:40:16 -06:00
Makefile 9p: Remove p9_idpool 2018-08-29 13:39:57 +09:00
client.c 9p/net: put a lower bound on msize 2018-12-25 17:07:49 +09:00
error.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
mod.c 9p: Use a slab for allocating requests 2018-08-29 13:39:57 +09:00
protocol.c 9p: p9dirent_read: check network-provided name length 2018-09-08 01:52:29 +09:00
protocol.h net/9p: Convert net/9p protocol dumps to tracepoints 2011-10-24 11:13:12 -05:00
trans_common.c net/9p: include trans_common.h to fix missing prototype warning. 2018-11-20 15:04:16 +09:00
trans_common.h net/9p: remove (now-)unused helpers 2015-04-11 22:28:29 -04:00
trans_fd.c 9p/trans_fd: put worker reqs on destroy 2018-10-10 09:14:34 +09:00
trans_rdma.c 9p/rdma: remove useless check in cm_event_handler 2018-09-08 01:52:22 +09:00
trans_virtio.c Merge branch 'work.afs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-11-03 10:35:52 -07:00
trans_xen.c 9p: Add refcount to p9_req_t 2018-09-08 01:39:47 +09:00