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afs: Fix corruption in reads at fpos 2G-4G from an OpenAFS server 

AFS-3 has two data fetch RPC variants, FS.FetchData and FS.FetchData64, and
Linux's afs client switches between them when talking to a non-YFS server
if the read size, the file position or the sum of the two have the upper 32
bits set of the 64-bit value.

This is a problem, however, since the file position and length fields of
FS.FetchData are *signed* 32-bit values.

Fix this by capturing the capability bits obtained from the fileserver when
it's sent an FS.GetCapabilities RPC, rather than just discarding them, and
then picking out the VICED_CAPABILITY_64BITFILES flag.  This can then be
used to decide whether to use FS.FetchData or FS.FetchData64 - and also
FS.StoreData or FS.StoreData64 - rather than using upper_32_bits() to
switch on the parameter values.

This capabilities flag could also be used to limit the maximum size of the
file, but all servers must be checked for that.

Note that the issue does not exist with FS.StoreData - that uses *unsigned*
32-bit values.  It's also not a problem with Auristor servers as its
YFS.FetchData64 op uses unsigned 64-bit values.

This can be tested by cloning a git repo through an OpenAFS client to an
OpenAFS server and then doing "git status" on it from a Linux afs
client[1].  Provided the clone has a pack file that's in the 2G-4G range,
the git status will show errors like:

	error: packfile .git/objects/pack/pack-5e813c51d12b6847bbc0fcd97c2bca66da50079c.pack does not match index
	error: packfile .git/objects/pack/pack-5e813c51d12b6847bbc0fcd97c2bca66da50079c.pack does not match index

This can be observed in the server's FileLog with something like the
following appearing:

Sun Aug 29 19:31:39 2021 SRXAFS_FetchData, Fid = 2303380852.491776.3263114, Host 192.168.11.201:7001, Id 1001
Sun Aug 29 19:31:39 2021 CheckRights: len=0, for host=192.168.11.201:7001
Sun Aug 29 19:31:39 2021 FetchData_RXStyle: Pos 18446744071815340032, Len 3154
Sun Aug 29 19:31:39 2021 FetchData_RXStyle: file size 2400758866
...
Sun Aug 29 19:31:40 2021 SRXAFS_FetchData returns 5

Note the file position of 18446744071815340032.  This is the requested file
position sign-extended.

Fixes: b9b1f8d593 ("AFS: write support fixes")
Reported-by: Markus Suvanto <markus.suvanto@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>
Tested-by: Markus Suvanto <markus.suvanto@gmail.com>
cc: linux-afs@lists.infradead.org
cc: openafs-devel@openafs.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=214217#c9 [1]
Link: https://lore.kernel.org/r/951332.1631308745@warthog.procyon.org.uk/
This commit is contained in:
David Howells 2021-09-10 00:01:52 +01:00
parent 4fe6a94682
commit b537a3c217
5 changed files with 49 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
fs/afs/fs_probe.c
View File

@ -9,6 +9,7 @@
#include <linux/slab.h>
#include "afs_fs.h"
#include "internal.h"
#include "protocol_afs.h"
#include "protocol_yfs.h"
static unsigned int afs_fs_probe_fast_poll_interval = 30 * HZ;
@ -102,7 +103,7 @@ void afs_fileserver_probe_result(struct afs_call *call)
struct afs_addr_list *alist = call->alist;
struct afs_server *server = call->server;
unsigned int index = call->addr_ix;
unsigned int rtt_us = 0;
unsigned int rtt_us = 0, cap0;
int ret = call->error;
_enter("%pU,%u", &server->uuid, index);
@ -159,6 +160,11 @@ void afs_fileserver_probe_result(struct afs_call *call)
clear_bit(AFS_SERVER_FL_IS_YFS, &server->flags);
alist->addrs[index].srx_service = call->service_id;
}
cap0 = ntohl(call->tmp);
if (cap0 & AFS3_VICED_CAPABILITY_64BITFILES)
set_bit(AFS_SERVER_FL_HAS_FS64, &server->flags);
else
clear_bit(AFS_SERVER_FL_HAS_FS64, &server->flags);
}
if (rxrpc_kernel_get_srtt(call->net->socket, call->rxcall, &rtt_us) &&

31
fs/afs/fsclient.c
View File

@ -456,9 +456,7 @@ void afs_fs_fetch_data(struct afs_operation *op)
struct afs_read *req = op->fetch.req;
__be32 *bp;
if (upper_32_bits(req->pos) ||
upper_32_bits(req->len) ||
upper_32_bits(req->pos + req->len))
if (test_bit(AFS_SERVER_FL_HAS_FS64, &op->server->flags))
return afs_fs_fetch_data64(op);
_enter("");
@ -1113,9 +1111,7 @@ void afs_fs_store_data(struct afs_operation *op)
(unsigned long long)op->store.pos,
(unsigned long long)op->store.i_size);
if (upper_32_bits(op->store.pos) ||
upper_32_bits(op->store.size) ||
upper_32_bits(op->store.i_size))
if (test_bit(AFS_SERVER_FL_HAS_FS64, &op->server->flags))
return afs_fs_store_data64(op);
call = afs_alloc_flat_call(op->net, &afs_RXFSStoreData,
@ -1229,7 +1225,7 @@ static void afs_fs_setattr_size(struct afs_operation *op)
key_serial(op->key), vp->fid.vid, vp->fid.vnode);
ASSERT(attr->ia_valid & ATTR_SIZE);
if (upper_32_bits(attr->ia_size))
if (test_bit(AFS_SERVER_FL_HAS_FS64, &op->server->flags))
return afs_fs_setattr_size64(op);
call = afs_alloc_flat_call(op->net, &afs_RXFSStoreData_as_Status,
@ -1657,20 +1653,33 @@ static int afs_deliver_fs_get_capabilities(struct afs_call *call)
return ret;
count = ntohl(call->tmp);
call->count = count;
call->count2 = count;
afs_extract_discard(call, count * sizeof(__be32));
if (count == 0) {
call->unmarshall = 4;
call->tmp = 0;
break;
}
/* Extract the first word of the capabilities to call->tmp */
afs_extract_to_tmp(call);
call->unmarshall++;
fallthrough;
/* Extract capabilities words */
case 2:
ret = afs_extract_data(call, false);
if (ret < 0)
return ret;
/* TODO: Examine capabilities */
afs_extract_discard(call, (count - 1) * sizeof(__be32));
call->unmarshall++;
fallthrough;
/* Extract remaining capabilities words */
case 3:
ret = afs_extract_data(call, false);
if (ret < 0)
return ret;
call->unmarshall++;
break;

1
fs/afs/internal.h
View File

@ -520,6 +520,7 @@ struct afs_server {
#define AFS_SERVER_FL_IS_YFS 16 /* Server is YFS not AFS */
#define AFS_SERVER_FL_NO_IBULK 17 /* Fileserver doesn't support FS.InlineBulkStatus */
#define AFS_SERVER_FL_NO_RM2 18 /* Fileserver doesn't support YFS.RemoveFile2 */
#define AFS_SERVER_FL_HAS_FS64 19 /* Fileserver supports FS.{Fetch,Store}Data64 */
atomic_t ref; /* Object refcount */
atomic_t active; /* Active user count */
u32 addr_version; /* Address list version */

15
fs/afs/protocol_afs.h Normal file
View File

@ -0,0 +1,15 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* AFS protocol bits
*
* Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#define AFSCAPABILITIESMAX 196 /* Maximum number of words in a capability set */
/* AFS3 Fileserver capabilities word 0 */
#define AFS3_VICED_CAPABILITY_ERRORTRANS 0x0001 /* Uses UAE errors */
#define AFS3_VICED_CAPABILITY_64BITFILES 0x0002 /* FetchData64 & StoreData64 supported */
#define AFS3_VICED_CAPABILITY_WRITELOCKACL 0x0004 /* Can lock a file even without lock perm */
#define AFS3_VICED_CAPABILITY_SANEACLS 0x0008 /* ACLs reviewed for sanity - don't use */

6
fs/afs/protocol_yfs.h
View File

@ -168,3 +168,9 @@ enum yfs_lock_type {
yfs_LockMandatoryWrite = 0x101,
yfs_LockMandatoryExtend = 0x102,
};
/* RXYFS Viced Capability Flags */
#define YFS_VICED_CAPABILITY_ERRORTRANS 0x0001 /* Deprecated v0.195 */
#define YFS_VICED_CAPABILITY_64BITFILES 0x0002 /* Deprecated v0.195 */
#define YFS_VICED_CAPABILITY_WRITELOCKACL 0x0004 /* Can lock a file even without lock perm */
#define YFS_VICED_CAPABILITY_SANEACLS 0x0008 /* Deprecated v0.195 */