Cyrill Gorcunov 27df6f25ff sunrpc: fix possible overrun on read of /proc/sys/sunrpc/transports ... Vegard Nossum reported ---------------------- > I noticed that something weird is going on with /proc/sys/sunrpc/transports. > This file is generated in net/sunrpc/sysctl.c, function proc_do_xprt(). When > I "cat" this file, I get the expected output: > $ cat /proc/sys/sunrpc/transports > tcp 1048576 > udp 32768 > But I think that it does not check the length of the buffer supplied by > userspace to read(). With my original program, I found that the stack was > being overwritten by the characters above, even when the length given to > read() was just 1. David Wagner added (among other things) that copy_to_user could be probably used here. Ingo Oeser suggested to use simple_read_from_buffer() here. The conclusion is that proc_do_xprt doesn't check for userside buffer size indeed so fix this by using Ingo's suggestion. Reported-by: Vegard Nossum <vegard.nossum@gmail.com> Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com> CC: Ingo Oeser <ioe-lkml@rameria.de> Cc: Neil Brown <neilb@suse.de> Cc: Chuck Lever <chuck.lever@oracle.com> Cc: Greg Banks <gnb@sgi.com> Cc: Tom Tucker <tom@opengridcomputing.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>		2008-09-01 14:24:24 -04:00
..
auth_gss	Merge branch 'for-2.6.27' of git://linux-nfs.org/~bfields/linux	2008-07-20 21:21:46 -07:00
xprtrdma	svcrdma: Fix race between svc_rdma_recvfrom thread and the dto_tasklet	2008-08-13 16:57:31 -04:00
auth_generic.c
auth_null.c
auth_unix.c
auth.c
cache.c
clnt.c
Makefile
rpc_pipe.c	SL*B: drop kmem cache argument from constructor	2008-07-26 12:00:07 -07:00
rpcb_clnt.c
sched.c
socklib.c
stats.c
sunrpc_syms.c
svc_xprt.c
svc.c	cpumask: change cpumask_of_cpu_ptr to use new cpumask_of_cpu	2008-07-26 16:40:33 +02:00
svcauth_unix.c
svcauth.c
svcsock.c
sysctl.c	sunrpc: fix possible overrun on read of /proc/sys/sunrpc/transports	2008-09-01 14:24:24 -04:00
timer.c
xdr.c
xprt.c
xprtsock.c