From ee5dc7732bd557bae6d10873a0aac606d2c551fb Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Fri, 21 Jan 2011 03:05:18 +0000 Subject: NFS: Fix "kernel BUG at fs/nfs/nfs3xdr.c:1338!" Milan Broz reports: > on today Linus' tree I get OOps if using nfs. > > server (2.6.36) exports dir: > /dir 172.16.1.0/24(rw,async,all_squash,no_subtree_check,anonuid=500,anongid=500) > > on client it is mounted in fstab > server:/dir /mnt/tst nfs rw,soft 0 0 > > and these commands OOpses it (simplified from a configure script): > > cd /dir > touch x > install x y > > [ 105.327701] ------------[ cut here ]------------ > [ 105.327979] kernel BUG at fs/nfs/nfs3xdr.c:1338! > [ 105.328075] invalid opcode: 0000 [#1] PREEMPT SMP > [ 105.328223] last sysfs file: /sys/devices/virtual/bdi/0:16/uevent > [ 105.328349] Modules linked in: usbcore dm_mod > [ 105.328553] > [ 105.328678] Pid: 3710, comm: install Not tainted 2.6.37+ #423 440BX Desktop Reference Platform/VMware Virtual Platform > [ 105.328853] EIP: 0060:[] EFLAGS: 00010282 CPU: 0 > [ 105.329152] EIP is at nfs3_xdr_enc_setacl3args+0x61/0x98 > [ 105.329249] EAX: ffffffea EBX: ce941d98 ECX: 00000000 EDX: 00000004 > [ 105.329340] ESI: ce941cd0 EDI: 000000a4 EBP: ce941cc0 ESP: ce941cb4 > [ 105.329431] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 > [ 105.329525] Process install (pid: 3710, ti=ce940000 task=ced36f20 task.ti=ce940000) > [ 105.336600] Stack: > [ 105.336693] ce941cd0 ce9dc000 00000000 ce941cf8 c12ecd02 c12f43e0 c116c00b cf754158 > [ 105.336982] ce9dc004 cf754284 ce9dc004 cf7ffee8 ceff9978 ce9dc000 cf7ffee8 ce9dc000 > [ 105.337182] ce9dc000 ce941d14 c12e698d cf75412c ce941d98 cf7ffee8 cf7fff20 00000000 > [ 105.337405] Call Trace: > [ 105.337695] [] rpcauth_wrap_req+0x75/0x7f > [ 105.337806] [] ? xdr_encode_opaque+0x12/0x15 > [ 105.337898] [] ? nfs3_xdr_enc_setacl3args+0x0/0x98 > [ 105.337988] [] call_transmit+0x17e/0x1e8 > [ 105.338072] [] __rpc_execute+0x6d/0x1a6 > [ 105.338155] [] rpc_execute+0x34/0x37 > [ 105.338235] [] rpc_run_task+0xb5/0xbd > [ 105.338316] [] rpc_call_sync+0x3d/0x58 > [ 105.338402] [] nfs3_proc_setacls+0x18e/0x24f > [ 105.338493] [] ? __kmalloc+0x148/0x1c4 > [ 105.338579] [] ? posix_acl_alloc+0x12/0x22 > [ 105.338665] [] nfs3_proc_setacl+0xa0/0xca > [ 105.338748] [] nfs3_setxattr+0x62/0x88 > [ 105.338834] [] ? sub_preempt_count+0x7c/0x89 > [ 105.338926] [] ? nfs3_setxattr+0x0/0x88 > [ 105.339026] [] __vfs_setxattr_noperm+0x26/0x95 > [ 105.339114] [] vfs_setxattr+0x5b/0x76 > [ 105.339211] [] setxattr+0x9d/0xc3 > [ 105.339298] [] ? handle_pte_fault+0x258/0x5cb > [ 105.339428] [] ? __free_pages+0x1a/0x23 > [ 105.339517] [] ? up_read+0x16/0x2c > [ 105.339599] [] ? fget+0x0/0xa3 > [ 105.339677] [] ? fget+0x0/0xa3 > [ 105.339760] [] ? get_parent_ip+0xb/0x31 > [ 105.339843] [] ? sub_preempt_count+0x7c/0x89 > [ 105.339931] [] sys_fsetxattr+0x51/0x79 > [ 105.340014] [] sysenter_do_call+0x12/0x32 > [ 105.340133] Code: 2e 76 18 00 58 31 d2 8b 7f 28 f6 43 04 01 74 03 8b 53 08 6a 00 8b 46 04 6a 01 8b 0b 52 89 fa e8 85 10 f8 ff 83 c4 0c 85 c0 79 04 <0f> 0b eb fe 31 c9 f6 43 04 04 74 03 8b 4b 0c 68 00 10 00 00 8d > [ 105.350321] EIP: [] nfs3_xdr_enc_setacl3args+0x61/0x98 SS:ESP 0068:ce941cb4 > [ 105.364385] ---[ end trace 01fcfe7f0f7f6e4a ]--- nfs3_xdr_enc_setacl3args() is not properly setting up the target buffer before nfsacl_encode() attempts to encode the ACL. Introduced by commit d9c407b1 "NFS: Introduce new-style XDR encoding functions for NFSv3." Signed-off-by: Chuck Lever Signed-off-by: Trond Myklebust diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c index 01c5e8b..183c6b1 100644 --- a/fs/nfs/nfs3xdr.c +++ b/fs/nfs/nfs3xdr.c @@ -1328,10 +1328,13 @@ static void nfs3_xdr_enc_setacl3args(struct rpc_rqst *req, encode_nfs_fh3(xdr, NFS_FH(args->inode)); encode_uint32(xdr, args->mask); + + base = req->rq_slen; if (args->npages != 0) xdr_write_pages(xdr, args->pages, 0, args->len); + else + xdr_reserve_space(xdr, NFS_ACL_INLINE_BUFSIZE); - base = req->rq_slen; error = nfsacl_encode(xdr->buf, base, args->inode, (args->mask & NFS_ACL) ? args->acl_access : NULL, 1, 0); -- cgit v0.10.2