Dave Wysochanski e4a7d1f770 SUNRPC: Handle 0 length opaque XDR object data properly ... When handling an auth_gss downcall, it's possible to get 0-length opaque object for the acceptor. In the case of a 0-length XDR object, make sure simple_get_netobj() fills in dest->data = NULL, and does not continue to kmemdup() which will set dest->data = ZERO_SIZE_PTR for the acceptor. The trace event code can handle NULL but not ZERO_SIZE_PTR for a string, and so without this patch the rpcgss_context trace event will crash the kernel as follows: [ 162.887992] BUG: kernel NULL pointer dereference, address: 0000000000000010 [ 162.898693] #PF: supervisor read access in kernel mode [ 162.900830] #PF: error_code(0x0000) - not-present page [ 162.902940] PGD 0 P4D 0 [ 162.904027] Oops: 0000 [#1] SMP PTI [ 162.905493] CPU: 4 PID: 4321 Comm: rpc.gssd Kdump: loaded Not tainted 5.10.0 #133 [ 162.908548] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 [ 162.910978] RIP: 0010:strlen+0x0/0x20 [ 162.912505] Code: 48 89 f9 74 09 48 83 c1 01 80 39 00 75 f7 31 d2 44 0f b6 04 16 44 88 04 11 48 83 c2 01 45 84 c0 75 ee c3 0f 1f 80 00 00 00 00 <80> 3f 00 74 10 48 89 f8 48 83 c0 01 80 38 00 75 f7 48 29 f8 c3 31 [ 162.920101] RSP: 0018:ffffaec900c77d90 EFLAGS: 00010202 [ 162.922263] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000fffde697 [ 162.925158] RDX: 000000000000002f RSI: 0000000000000080 RDI: 0000000000000010 [ 162.928073] RBP: 0000000000000010 R08: 0000000000000e10 R09: 0000000000000000 [ 162.930976] R10: ffff8e698a590cb8 R11: 0000000000000001 R12: 0000000000000e10 [ 162.933883] R13: 00000000fffde697 R14: 000000010034d517 R15: 0000000000070028 [ 162.936777] FS: 00007f1e1eb93700(0000) GS:ffff8e6ab7d00000(0000) knlGS:0000000000000000 [ 162.940067] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 162.942417] CR2: 0000000000000010 CR3: 0000000104eba000 CR4: 00000000000406e0 [ 162.945300] Call Trace: [ 162.946428] trace_event_raw_event_rpcgss_context+0x84/0x140 [auth_rpcgss] [ 162.949308] ? __kmalloc_track_caller+0x35/0x5a0 [ 162.951224] ? gss_pipe_downcall+0x3a3/0x6a0 [auth_rpcgss] [ 162.953484] gss_pipe_downcall+0x585/0x6a0 [auth_rpcgss] [ 162.955953] rpc_pipe_write+0x58/0x70 [sunrpc] [ 162.957849] vfs_write+0xcb/0x2c0 [ 162.959264] ksys_write+0x68/0xe0 [ 162.960706] do_syscall_64+0x33/0x40 [ 162.962238] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 162.964346] RIP: 0033:0x7f1e1f1e57df Signed-off-by: Dave Wysochanski <dwysocha@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>		2021-01-25 15:59:12 -05:00
..
auth_gss	SUNRPC: Handle 0 length opaque XDR object data properly	2021-01-25 15:59:12 -05:00
xprtrdma	NFS client updates for Linux 5.11	2020-12-17 12:15:03 -08:00
addr.c	net: sunrpc: interpret the return value of kstrtou32 correctly	2021-01-10 13:32:51 -05:00
auth.c
auth_null.c
auth_unix.c
backchannel_rqst.c	The one new feature this time, from Anna Schumaker, is READ_PLUS, which	2020-10-22 09:44:27 -07:00
cache.c	sunrpc: clean-up cache downcall	2020-12-09 09:38:34 -05:00
clnt.c	SUNRPC: Clean up the handling of page padding in rpc_prepare_reply_pages()	2020-12-02 14:05:53 -05:00
debugfs.c	net: sunrpc: Fix 'snprintf' return value check in 'do_xprt_debugfs'	2020-12-02 14:05:54 -05:00
Kconfig
Makefile
netns.h
rpc_pipe.c	net: datagram: fix some kernel-doc markups	2020-11-17 14:15:03 -08:00
rpcb_clnt.c
sched.c	SUNRPC: rpc_wake_up() should wake up tasks in the correct order	2020-12-02 14:05:51 -05:00
socklib.c
socklib.h
stats.c
sunrpc.h
sunrpc_syms.c
svc.c	SUNRPC: Prepare for xdr_stream-style decoding on the server-side	2020-11-30 14:46:35 -05:00
svc_xprt.c	SUNRPC: Move the svc_xdr_recvfrom tracepoint again	2021-01-13 09:13:20 -05:00
svcauth.c
svcauth_unix.c
svcsock.c	SUNRPC: Handle TCP socket sends with kernel_sendpage() again	2020-12-18 12:28:41 -05:00
sysctl.c	net/sunrpc: fix useless comparison in proc_do_xprt()	2020-11-08 16:28:25 -05:00
timer.c
xdr.c	NFS client updates for Linux 5.11	2020-12-17 12:15:03 -08:00
xprt.c	SUNRPC: Remove unused function xprt_load_transport()	2020-12-02 14:05:53 -05:00
xprtmultipath.c
xprtsock.c	sunrpc: fix xs_read_xdr_buf for partial pages receive	2020-12-14 06:46:55 -05:00