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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a818101d7b
An NULL-pointer dereference happens in cachefiles_mark_object_inactive()
when it tries to read i_blocks so that it can tell the cachefilesd daemon
how much space it's making available.
The problem is that cachefiles_drop_object() calls
cachefiles_mark_object_inactive() after calling cachefiles_delete_object()
because the object being marked active staves off attempts to (re-)use the
file at that filename until after it has been deleted. This means that
d_inode is NULL by the time we come to try to access it.
To fix the problem, have the caller of cachefiles_mark_object_inactive()
supply the number of blocks freed up.
Without this, the following oops may occur:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000098
IP: [<ffffffffa06c5cc1>] cachefiles_mark_object_inactive+0x61/0xb0 [cachefiles]
...
CPU: 11 PID: 527 Comm: kworker/u64:4 Tainted: G I ------------ 3.10.0-470.el7.x86_64 #1
Hardware name: Hewlett-Packard HP Z600 Workstation/0B54h, BIOS 786G4 v03.19 03/11/2011
Workqueue: fscache_object fscache_object_work_func [fscache]
task: ffff880035edaf10 ti: ffff8800b77c0000 task.ti: ffff8800b77c0000
RIP: 0010:[<ffffffffa06c5cc1>] cachefiles_mark_object_inactive+0x61/0xb0 [cachefiles]
RSP: 0018:ffff8800b77c3d70 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8800bf6cc400 RCX: 0000000000000034
RDX: 0000000000000000 RSI: ffff880090ffc710 RDI: ffff8800bf761ef8
RBP: ffff8800b77c3d88 R08: 2000000000000000 R09: 0090ffc710000000
R10: ff51005d2ff1c400 R11: 0000000000000000 R12: ffff880090ffc600
R13: ffff8800bf6cc520 R14: ffff8800bf6cc400 R15: ffff8800bf6cc498
FS: 0000000000000000(0000) GS:ffff8800bb8c0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000098 CR3: 00000000019ba000 CR4: 00000000000007e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Stack:
ffff880090ffc600 ffff8800bf6cc400 ffff8800867df140 ffff8800b77c3db0
ffffffffa06c48cb ffff880090ffc600 ffff880090ffc180 ffff880090ffc658
ffff8800b77c3df0 ffffffffa085d846 ffff8800a96b8150 ffff880090ffc600
Call Trace:
[<ffffffffa06c48cb>] cachefiles_drop_object+0x6b/0xf0 [cachefiles]
[<ffffffffa085d846>] fscache_drop_object+0xd6/0x1e0 [fscache]
[<ffffffffa085d615>] fscache_object_work_func+0xa5/0x200 [fscache]
[<ffffffff810a605b>] process_one_work+0x17b/0x470
[<ffffffff810a6e96>] worker_thread+0x126/0x410
[<ffffffff810a6d70>] ? rescuer_thread+0x460/0x460
[<ffffffff810ae64f>] kthread+0xcf/0xe0
[<ffffffff810ae580>] ? kthread_create_on_node+0x140/0x140
[<ffffffff81695418>] ret_from_fork+0x58/0x90
[<ffffffff810ae580>] ? kthread_create_on_node+0x140/0x140
The oopsing code shows:
callq 0xffffffff810af6a0 <wake_up_bit>
mov 0xf8(%r12),%rax
mov 0x30(%rax),%rax
mov 0x98(%rax),%rax <---- oops here
lock add %rax,0x130(%rbx)
where this is:
d_backing_inode(object->dentry)->i_blocks
Fixes: a5b3a80b89
(CacheFiles: Provide read-and-reset release counters for cachefilesd)
Reported-by: Jianhong Yin <jiyin@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Steve Dickson <steved@redhat.com>
cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
557 lines
15 KiB
C
557 lines
15 KiB
C
/* FS-Cache interface to CacheFiles
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#include <linux/slab.h>
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#include <linux/mount.h>
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#include "internal.h"
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struct cachefiles_lookup_data {
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struct cachefiles_xattr *auxdata; /* auxiliary data */
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char *key; /* key path */
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};
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static int cachefiles_attr_changed(struct fscache_object *_object);
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/*
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* allocate an object record for a cookie lookup and prepare the lookup data
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*/
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static struct fscache_object *cachefiles_alloc_object(
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struct fscache_cache *_cache,
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struct fscache_cookie *cookie)
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{
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struct cachefiles_lookup_data *lookup_data;
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struct cachefiles_object *object;
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struct cachefiles_cache *cache;
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struct cachefiles_xattr *auxdata;
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unsigned keylen, auxlen;
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void *buffer;
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char *key;
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cache = container_of(_cache, struct cachefiles_cache, cache);
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_enter("{%s},%p,", cache->cache.identifier, cookie);
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lookup_data = kmalloc(sizeof(*lookup_data), cachefiles_gfp);
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if (!lookup_data)
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goto nomem_lookup_data;
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/* create a new object record and a temporary leaf image */
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object = kmem_cache_alloc(cachefiles_object_jar, cachefiles_gfp);
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if (!object)
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goto nomem_object;
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ASSERTCMP(object->backer, ==, NULL);
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BUG_ON(test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags));
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atomic_set(&object->usage, 1);
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fscache_object_init(&object->fscache, cookie, &cache->cache);
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object->type = cookie->def->type;
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/* get hold of the raw key
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* - stick the length on the front and leave space on the back for the
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* encoder
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*/
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buffer = kmalloc((2 + 512) + 3, cachefiles_gfp);
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if (!buffer)
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goto nomem_buffer;
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keylen = cookie->def->get_key(cookie->netfs_data, buffer + 2, 512);
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ASSERTCMP(keylen, <, 512);
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*(uint16_t *)buffer = keylen;
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((char *)buffer)[keylen + 2] = 0;
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((char *)buffer)[keylen + 3] = 0;
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((char *)buffer)[keylen + 4] = 0;
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/* turn the raw key into something that can work with as a filename */
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key = cachefiles_cook_key(buffer, keylen + 2, object->type);
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if (!key)
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goto nomem_key;
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/* get hold of the auxiliary data and prepend the object type */
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auxdata = buffer;
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auxlen = 0;
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if (cookie->def->get_aux) {
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auxlen = cookie->def->get_aux(cookie->netfs_data,
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auxdata->data, 511);
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ASSERTCMP(auxlen, <, 511);
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}
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auxdata->len = auxlen + 1;
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auxdata->type = cookie->def->type;
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lookup_data->auxdata = auxdata;
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lookup_data->key = key;
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object->lookup_data = lookup_data;
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_leave(" = %p [%p]", &object->fscache, lookup_data);
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return &object->fscache;
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nomem_key:
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kfree(buffer);
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nomem_buffer:
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BUG_ON(test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags));
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kmem_cache_free(cachefiles_object_jar, object);
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fscache_object_destroyed(&cache->cache);
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nomem_object:
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kfree(lookup_data);
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nomem_lookup_data:
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_leave(" = -ENOMEM");
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return ERR_PTR(-ENOMEM);
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}
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/*
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* attempt to look up the nominated node in this cache
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* - return -ETIMEDOUT to be scheduled again
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*/
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static int cachefiles_lookup_object(struct fscache_object *_object)
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{
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struct cachefiles_lookup_data *lookup_data;
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struct cachefiles_object *parent, *object;
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struct cachefiles_cache *cache;
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const struct cred *saved_cred;
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int ret;
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_enter("{OBJ%x}", _object->debug_id);
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cache = container_of(_object->cache, struct cachefiles_cache, cache);
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parent = container_of(_object->parent,
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struct cachefiles_object, fscache);
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object = container_of(_object, struct cachefiles_object, fscache);
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lookup_data = object->lookup_data;
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ASSERTCMP(lookup_data, !=, NULL);
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/* look up the key, creating any missing bits */
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cachefiles_begin_secure(cache, &saved_cred);
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ret = cachefiles_walk_to_object(parent, object,
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lookup_data->key,
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lookup_data->auxdata);
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cachefiles_end_secure(cache, saved_cred);
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/* polish off by setting the attributes of non-index files */
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if (ret == 0 &&
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object->fscache.cookie->def->type != FSCACHE_COOKIE_TYPE_INDEX)
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cachefiles_attr_changed(&object->fscache);
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if (ret < 0 && ret != -ETIMEDOUT) {
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if (ret != -ENOBUFS)
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pr_warn("Lookup failed error %d\n", ret);
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fscache_object_lookup_error(&object->fscache);
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}
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_leave(" [%d]", ret);
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return ret;
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}
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/*
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* indication of lookup completion
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*/
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static void cachefiles_lookup_complete(struct fscache_object *_object)
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{
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struct cachefiles_object *object;
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object = container_of(_object, struct cachefiles_object, fscache);
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_enter("{OBJ%x,%p}", object->fscache.debug_id, object->lookup_data);
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if (object->lookup_data) {
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kfree(object->lookup_data->key);
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kfree(object->lookup_data->auxdata);
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kfree(object->lookup_data);
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object->lookup_data = NULL;
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}
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}
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/*
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* increment the usage count on an inode object (may fail if unmounting)
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*/
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static
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struct fscache_object *cachefiles_grab_object(struct fscache_object *_object)
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{
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struct cachefiles_object *object =
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container_of(_object, struct cachefiles_object, fscache);
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_enter("{OBJ%x,%d}", _object->debug_id, atomic_read(&object->usage));
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#ifdef CACHEFILES_DEBUG_SLAB
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ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000);
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#endif
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atomic_inc(&object->usage);
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return &object->fscache;
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}
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/*
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* update the auxiliary data for an object object on disk
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*/
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static void cachefiles_update_object(struct fscache_object *_object)
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{
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struct cachefiles_object *object;
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struct cachefiles_xattr *auxdata;
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struct cachefiles_cache *cache;
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struct fscache_cookie *cookie;
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const struct cred *saved_cred;
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unsigned auxlen;
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_enter("{OBJ%x}", _object->debug_id);
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object = container_of(_object, struct cachefiles_object, fscache);
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cache = container_of(object->fscache.cache, struct cachefiles_cache,
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cache);
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if (!fscache_use_cookie(_object)) {
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_leave(" [relinq]");
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return;
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}
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cookie = object->fscache.cookie;
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if (!cookie->def->get_aux) {
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fscache_unuse_cookie(_object);
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_leave(" [no aux]");
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return;
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}
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auxdata = kmalloc(2 + 512 + 3, cachefiles_gfp);
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if (!auxdata) {
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fscache_unuse_cookie(_object);
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_leave(" [nomem]");
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return;
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}
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auxlen = cookie->def->get_aux(cookie->netfs_data, auxdata->data, 511);
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fscache_unuse_cookie(_object);
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ASSERTCMP(auxlen, <, 511);
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auxdata->len = auxlen + 1;
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auxdata->type = cookie->def->type;
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cachefiles_begin_secure(cache, &saved_cred);
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cachefiles_update_object_xattr(object, auxdata);
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cachefiles_end_secure(cache, saved_cred);
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kfree(auxdata);
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_leave("");
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}
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/*
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* discard the resources pinned by an object and effect retirement if
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* requested
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*/
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static void cachefiles_drop_object(struct fscache_object *_object)
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{
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struct cachefiles_object *object;
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struct cachefiles_cache *cache;
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const struct cred *saved_cred;
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struct inode *inode;
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blkcnt_t i_blocks = 0;
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ASSERT(_object);
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object = container_of(_object, struct cachefiles_object, fscache);
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_enter("{OBJ%x,%d}",
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object->fscache.debug_id, atomic_read(&object->usage));
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cache = container_of(object->fscache.cache,
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struct cachefiles_cache, cache);
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#ifdef CACHEFILES_DEBUG_SLAB
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ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000);
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#endif
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/* We need to tidy the object up if we did in fact manage to open it.
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* It's possible for us to get here before the object is fully
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* initialised if the parent goes away or the object gets retired
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* before we set it up.
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*/
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if (object->dentry) {
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/* delete retired objects */
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if (test_bit(FSCACHE_OBJECT_RETIRED, &object->fscache.flags) &&
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_object != cache->cache.fsdef
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) {
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_debug("- retire object OBJ%x", object->fscache.debug_id);
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inode = d_backing_inode(object->dentry);
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if (inode)
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i_blocks = inode->i_blocks;
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cachefiles_begin_secure(cache, &saved_cred);
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cachefiles_delete_object(cache, object);
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cachefiles_end_secure(cache, saved_cred);
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}
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/* close the filesystem stuff attached to the object */
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if (object->backer != object->dentry)
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dput(object->backer);
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object->backer = NULL;
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}
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/* note that the object is now inactive */
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if (test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags))
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cachefiles_mark_object_inactive(cache, object, i_blocks);
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dput(object->dentry);
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object->dentry = NULL;
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_leave("");
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}
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/*
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* dispose of a reference to an object
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*/
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static void cachefiles_put_object(struct fscache_object *_object)
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{
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struct cachefiles_object *object;
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struct fscache_cache *cache;
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ASSERT(_object);
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object = container_of(_object, struct cachefiles_object, fscache);
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_enter("{OBJ%x,%d}",
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object->fscache.debug_id, atomic_read(&object->usage));
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#ifdef CACHEFILES_DEBUG_SLAB
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ASSERT((atomic_read(&object->usage) & 0xffff0000) != 0x6b6b0000);
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#endif
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ASSERTIFCMP(object->fscache.parent,
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object->fscache.parent->n_children, >, 0);
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if (atomic_dec_and_test(&object->usage)) {
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_debug("- kill object OBJ%x", object->fscache.debug_id);
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ASSERT(!test_bit(CACHEFILES_OBJECT_ACTIVE, &object->flags));
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ASSERTCMP(object->fscache.parent, ==, NULL);
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ASSERTCMP(object->backer, ==, NULL);
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ASSERTCMP(object->dentry, ==, NULL);
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ASSERTCMP(object->fscache.n_ops, ==, 0);
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ASSERTCMP(object->fscache.n_children, ==, 0);
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if (object->lookup_data) {
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kfree(object->lookup_data->key);
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kfree(object->lookup_data->auxdata);
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kfree(object->lookup_data);
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object->lookup_data = NULL;
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}
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cache = object->fscache.cache;
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fscache_object_destroy(&object->fscache);
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kmem_cache_free(cachefiles_object_jar, object);
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fscache_object_destroyed(cache);
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}
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_leave("");
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}
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/*
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* sync a cache
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*/
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static void cachefiles_sync_cache(struct fscache_cache *_cache)
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{
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struct cachefiles_cache *cache;
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const struct cred *saved_cred;
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int ret;
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_enter("%p", _cache);
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cache = container_of(_cache, struct cachefiles_cache, cache);
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/* make sure all pages pinned by operations on behalf of the netfs are
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* written to disc */
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cachefiles_begin_secure(cache, &saved_cred);
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down_read(&cache->mnt->mnt_sb->s_umount);
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ret = sync_filesystem(cache->mnt->mnt_sb);
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up_read(&cache->mnt->mnt_sb->s_umount);
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cachefiles_end_secure(cache, saved_cred);
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if (ret == -EIO)
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cachefiles_io_error(cache,
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"Attempt to sync backing fs superblock"
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" returned error %d",
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ret);
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}
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/*
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* check if the backing cache is updated to FS-Cache
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* - called by FS-Cache when evaluates if need to invalidate the cache
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*/
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static int cachefiles_check_consistency(struct fscache_operation *op)
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{
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struct cachefiles_object *object;
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struct cachefiles_cache *cache;
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const struct cred *saved_cred;
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int ret;
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_enter("{OBJ%x}", op->object->debug_id);
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object = container_of(op->object, struct cachefiles_object, fscache);
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cache = container_of(object->fscache.cache,
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struct cachefiles_cache, cache);
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cachefiles_begin_secure(cache, &saved_cred);
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ret = cachefiles_check_auxdata(object);
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cachefiles_end_secure(cache, saved_cred);
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_leave(" = %d", ret);
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return ret;
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}
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/*
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* notification the attributes on an object have changed
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* - called with reads/writes excluded by FS-Cache
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*/
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static int cachefiles_attr_changed(struct fscache_object *_object)
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{
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struct cachefiles_object *object;
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struct cachefiles_cache *cache;
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const struct cred *saved_cred;
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struct iattr newattrs;
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uint64_t ni_size;
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loff_t oi_size;
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int ret;
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_object->cookie->def->get_attr(_object->cookie->netfs_data, &ni_size);
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_enter("{OBJ%x},[%llu]",
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_object->debug_id, (unsigned long long) ni_size);
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object = container_of(_object, struct cachefiles_object, fscache);
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cache = container_of(object->fscache.cache,
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struct cachefiles_cache, cache);
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if (ni_size == object->i_size)
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return 0;
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if (!object->backer)
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return -ENOBUFS;
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ASSERT(d_is_reg(object->backer));
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fscache_set_store_limit(&object->fscache, ni_size);
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oi_size = i_size_read(d_backing_inode(object->backer));
|
|
if (oi_size == ni_size)
|
|
return 0;
|
|
|
|
cachefiles_begin_secure(cache, &saved_cred);
|
|
inode_lock(d_inode(object->backer));
|
|
|
|
/* if there's an extension to a partial page at the end of the backing
|
|
* file, we need to discard the partial page so that we pick up new
|
|
* data after it */
|
|
if (oi_size & ~PAGE_MASK && ni_size > oi_size) {
|
|
_debug("discard tail %llx", oi_size);
|
|
newattrs.ia_valid = ATTR_SIZE;
|
|
newattrs.ia_size = oi_size & PAGE_MASK;
|
|
ret = notify_change(object->backer, &newattrs, NULL);
|
|
if (ret < 0)
|
|
goto truncate_failed;
|
|
}
|
|
|
|
newattrs.ia_valid = ATTR_SIZE;
|
|
newattrs.ia_size = ni_size;
|
|
ret = notify_change(object->backer, &newattrs, NULL);
|
|
|
|
truncate_failed:
|
|
inode_unlock(d_inode(object->backer));
|
|
cachefiles_end_secure(cache, saved_cred);
|
|
|
|
if (ret == -EIO) {
|
|
fscache_set_store_limit(&object->fscache, 0);
|
|
cachefiles_io_error_obj(object, "Size set failed");
|
|
ret = -ENOBUFS;
|
|
}
|
|
|
|
_leave(" = %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Invalidate an object
|
|
*/
|
|
static void cachefiles_invalidate_object(struct fscache_operation *op)
|
|
{
|
|
struct cachefiles_object *object;
|
|
struct cachefiles_cache *cache;
|
|
const struct cred *saved_cred;
|
|
struct path path;
|
|
uint64_t ni_size;
|
|
int ret;
|
|
|
|
object = container_of(op->object, struct cachefiles_object, fscache);
|
|
cache = container_of(object->fscache.cache,
|
|
struct cachefiles_cache, cache);
|
|
|
|
op->object->cookie->def->get_attr(op->object->cookie->netfs_data,
|
|
&ni_size);
|
|
|
|
_enter("{OBJ%x},[%llu]",
|
|
op->object->debug_id, (unsigned long long)ni_size);
|
|
|
|
if (object->backer) {
|
|
ASSERT(d_is_reg(object->backer));
|
|
|
|
fscache_set_store_limit(&object->fscache, ni_size);
|
|
|
|
path.dentry = object->backer;
|
|
path.mnt = cache->mnt;
|
|
|
|
cachefiles_begin_secure(cache, &saved_cred);
|
|
ret = vfs_truncate(&path, 0);
|
|
if (ret == 0)
|
|
ret = vfs_truncate(&path, ni_size);
|
|
cachefiles_end_secure(cache, saved_cred);
|
|
|
|
if (ret != 0) {
|
|
fscache_set_store_limit(&object->fscache, 0);
|
|
if (ret == -EIO)
|
|
cachefiles_io_error_obj(object,
|
|
"Invalidate failed");
|
|
}
|
|
}
|
|
|
|
fscache_op_complete(op, true);
|
|
_leave("");
|
|
}
|
|
|
|
/*
|
|
* dissociate a cache from all the pages it was backing
|
|
*/
|
|
static void cachefiles_dissociate_pages(struct fscache_cache *cache)
|
|
{
|
|
_enter("");
|
|
}
|
|
|
|
const struct fscache_cache_ops cachefiles_cache_ops = {
|
|
.name = "cachefiles",
|
|
.alloc_object = cachefiles_alloc_object,
|
|
.lookup_object = cachefiles_lookup_object,
|
|
.lookup_complete = cachefiles_lookup_complete,
|
|
.grab_object = cachefiles_grab_object,
|
|
.update_object = cachefiles_update_object,
|
|
.invalidate_object = cachefiles_invalidate_object,
|
|
.drop_object = cachefiles_drop_object,
|
|
.put_object = cachefiles_put_object,
|
|
.sync_cache = cachefiles_sync_cache,
|
|
.attr_changed = cachefiles_attr_changed,
|
|
.read_or_alloc_page = cachefiles_read_or_alloc_page,
|
|
.read_or_alloc_pages = cachefiles_read_or_alloc_pages,
|
|
.allocate_page = cachefiles_allocate_page,
|
|
.allocate_pages = cachefiles_allocate_pages,
|
|
.write_page = cachefiles_write_page,
|
|
.uncache_page = cachefiles_uncache_page,
|
|
.dissociate_pages = cachefiles_dissociate_pages,
|
|
.check_consistency = cachefiles_check_consistency,
|
|
};
|