felix cc2e7ebbeb SUNRPC: Fix RPC client cleaned up the freed pipefs dentries ... [ Upstream commit bfca5fb4e9 ] RPC client pipefs dentries cleanup is in separated rpc_remove_pipedir() workqueue,which takes care about pipefs superblock locking. In some special scenarios, when kernel frees the pipefs sb of the current client and immediately alloctes a new pipefs sb, rpc_remove_pipedir function would misjudge the existence of pipefs sb which is not the one it used to hold. As a result, the rpc_remove_pipedir would clean the released freed pipefs dentries. To fix this issue, rpc_remove_pipedir should check whether the current pipefs sb is consistent with the original pipefs sb. This error can be catched by KASAN: ========================================================= [ 250.497700] BUG: KASAN: slab-use-after-free in dget_parent+0x195/0x200 [ 250.498315] Read of size 4 at addr ffff88800a2ab804 by task kworker/0:18/106503 [ 250.500549] Workqueue: events rpc_free_client_work [ 250.501001] Call Trace: [ 250.502880] kasan_report+0xb6/0xf0 [ 250.503209] ? dget_parent+0x195/0x200 [ 250.503561] dget_parent+0x195/0x200 [ 250.503897] ? __pfx_rpc_clntdir_depopulate+0x10/0x10 [ 250.504384] rpc_rmdir_depopulate+0x1b/0x90 [ 250.504781] rpc_remove_client_dir+0xf5/0x150 [ 250.505195] rpc_free_client_work+0xe4/0x230 [ 250.505598] process_one_work+0x8ee/0x13b0 ... [ 22.039056] Allocated by task 244: [ 22.039390] kasan_save_stack+0x22/0x50 [ 22.039758] kasan_set_track+0x25/0x30 [ 22.040109] __kasan_slab_alloc+0x59/0x70 [ 22.040487] kmem_cache_alloc_lru+0xf0/0x240 [ 22.040889] __d_alloc+0x31/0x8e0 [ 22.041207] d_alloc+0x44/0x1f0 [ 22.041514] __rpc_lookup_create_exclusive+0x11c/0x140 [ 22.041987] rpc_mkdir_populate.constprop.0+0x5f/0x110 [ 22.042459] rpc_create_client_dir+0x34/0x150 [ 22.042874] rpc_setup_pipedir_sb+0x102/0x1c0 [ 22.043284] rpc_client_register+0x136/0x4e0 [ 22.043689] rpc_new_client+0x911/0x1020 [ 22.044057] rpc_create_xprt+0xcb/0x370 [ 22.044417] rpc_create+0x36b/0x6c0 ... [ 22.049524] Freed by task 0: [ 22.049803] kasan_save_stack+0x22/0x50 [ 22.050165] kasan_set_track+0x25/0x30 [ 22.050520] kasan_save_free_info+0x2b/0x50 [ 22.050921] __kasan_slab_free+0x10e/0x1a0 [ 22.051306] kmem_cache_free+0xa5/0x390 [ 22.051667] rcu_core+0x62c/0x1930 [ 22.051995] __do_softirq+0x165/0x52a [ 22.052347] [ 22.052503] Last potentially related work creation: [ 22.052952] kasan_save_stack+0x22/0x50 [ 22.053313] __kasan_record_aux_stack+0x8e/0xa0 [ 22.053739] __call_rcu_common.constprop.0+0x6b/0x8b0 [ 22.054209] dentry_free+0xb2/0x140 [ 22.054540] __dentry_kill+0x3be/0x540 [ 22.054900] shrink_dentry_list+0x199/0x510 [ 22.055293] shrink_dcache_parent+0x190/0x240 [ 22.055703] do_one_tree+0x11/0x40 [ 22.056028] shrink_dcache_for_umount+0x61/0x140 [ 22.056461] generic_shutdown_super+0x70/0x590 [ 22.056879] kill_anon_super+0x3a/0x60 [ 22.057234] rpc_kill_sb+0x121/0x200 Fixes: 0157d021d2 ("SUNRPC: handle RPC client pipefs dentries by network namespace aware routines") Signed-off-by: felix <fuzhen5@huawei.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-11-28 17:19:49 +00:00
..
addr.h	…
auth.h	…
auth_gss.h	…
bc_xprt.h	…
cache.h	SUNRPC: change cache_head.flags bits to enum	2023-08-29 17:45:22 -04:00
clnt.h	SUNRPC: Fix RPC client cleaned up the freed pipefs dentries	2023-11-28 17:19:49 +00:00
debug.h	…
gss_api.h	…
gss_asn1.h	…
gss_err.h	…
gss_krb5.h	…
metrics.h	…
msg_prot.h	…
rpc_pipe_fs.h	…
rpc_rdma.h	…
rpc_rdma_cid.h	…
sched.h	…
stats.h	SUNRPC: Remove unused declaration rpc_modcount()	2023-08-29 17:45:22 -04:00
svc.h	SUNRPC: Remove return value of svc_pool_wake_idle_thread()	2023-08-29 17:45:22 -04:00
svc_rdma.h	…
svc_rdma_pcl.h	…
svc_xprt.h	SUNRPC: change svc_xprt::xpt_flags bits to enum	2023-08-29 17:45:22 -04:00
svcauth.h	SUNRPC: Add enum svc_auth_status	2023-08-29 17:45:22 -04:00
svcauth_gss.h	…
svcsock.h	SUNRPC: Remove unused declarations	2023-08-29 17:45:22 -04:00
timer.h	…
types.h	…
xdr.h	SUNRPC: Silence compiler complaints about tautological comparisons	2023-09-15 15:50:39 -04:00
xprt.h	SUNRPC: Allow specification of TCP client connect timeout at setup	2023-08-24 13:24:15 -04:00
xprtmultipath.h	…
xprtrdma.h	…
xprtsock.h	…