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afs: Fix delayed allocation of a cell's anonymous key

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The allocation of a cell's anonymous key is done in a background thread
along with other cell setup such as doing a DNS upcall.  In the reported
bug, this is triggered by afs_parse_source() parsing the device name given
to mount() and calling afs_lookup_cell() with the name of the cell.

The normal key lookup then tries to use the key description on the
anonymous authentication key as the reference for request_key() - but it
may not yet be set and so an oops can happen.

This has been made more likely to happen by the fix for dynamic lookup
failure.

Fix this by firstly allocating a reference name and attaching it to the
afs_cell record when the record is created.  It can share the memory
allocation with the cell name (unfortunately it can't just overlap the cell
name by prepending it with "afs@" as the cell name already has a '.'
prepended for other purposes).  This reference name is then passed to
request_key().

Secondly, the anon key is now allocated on demand at the point a key is
requested in afs_request_key() if it is not already allocated.  A mutex is
used to prevent multiple allocation for a cell.

Thirdly, make afs_request_key_rcu() return NULL if the anonymous key isn't
yet allocated (if we need it) and then the caller can return -ECHILD to
drop out of RCU-mode and afs_request_key() can be called.

Note that the anonymous key is kind of necessary to make the key lookup
cache work as that doesn't currently cache a negative lookup, but it's
probably worth some investigation to see if NULL can be used instead.

Fixes: 330e2c5148 ("afs: Fix dynamic lookup to fail on cell lookup failure")
Reported-by: syzbot+41c68824eefb67cdf00c@syzkaller.appspotmail.com
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://patch.msgid.link/800328.1764325145@warthog.procyon.org.uk
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
David Howells
2025-11-28 10:19:05 +00:00
committed by Christian Brauner
parent e9c70084a6
commit d27c712578
3 changed files with 49 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
fs/afs/cell.c
View File

@@ -140,7 +140,9 @@ static struct afs_cell *afs_alloc_cell(struct afs_net *net,
return ERR_PTR(-ENOMEM);
}
cell->name = kmalloc(1 + namelen + 1, GFP_KERNEL);
/* Allocate the cell name and the key name in one go. */
cell->name = kmalloc(1 + namelen + 1 +
4 + namelen + 1, GFP_KERNEL);
if (!cell->name) {
kfree(cell);
return ERR_PTR(-ENOMEM);
@@ -151,7 +153,11 @@ static struct afs_cell *afs_alloc_cell(struct afs_net *net,
cell->name_len = namelen;
for (i = 0; i < namelen; i++)
cell->name[i] = tolower(name[i]);
cell->name[i] = 0;
cell->name[i++] = 0;
cell->key_desc = cell->name + i;
memcpy(cell->key_desc, "afs@", 4);
memcpy(cell->key_desc + 4, cell->name, cell->name_len + 1);
cell->net = net;
refcount_set(&cell->ref, 1);
@@ -710,33 +716,6 @@ void afs_set_cell_timer(struct afs_cell *cell, unsigned int delay_secs)
timer_reduce(&cell->management_timer, jiffies + delay_secs * HZ);
}
/*
* Allocate a key to use as a placeholder for anonymous user security.
*/
static int afs_alloc_anon_key(struct afs_cell *cell)
{
struct key *key;
char keyname[4 + AFS_MAXCELLNAME + 1], *cp, *dp;
/* Create a key to represent an anonymous user. */
memcpy(keyname, "afs@", 4);
dp = keyname + 4;
cp = cell->name;
do {
*dp++ = tolower(*cp);
} while (*cp++);
key = rxrpc_get_null_key(keyname);
if (IS_ERR(key))
return PTR_ERR(key);
cell->anonymous_key = key;
_debug("anon key %p{%x}",
cell->anonymous_key, key_serial(cell->anonymous_key));
return 0;
}
/*
* Activate a cell.
*/
@@ -746,12 +725,6 @@ static int afs_activate_cell(struct afs_net *net, struct afs_cell *cell)
struct afs_cell *pcell;
int ret;
if (!cell->anonymous_key) {
ret = afs_alloc_anon_key(cell);
if (ret < 0)
return ret;
}
ret = afs_proc_cell_setup(cell);
if (ret < 0)
return ret;

1
fs/afs/internal.h
View File

@@ -413,6 +413,7 @@ struct afs_cell {
u8 name_len; /* Length of name */
char *name; /* Cell name, case-flattened and NUL-padded */
char *key_desc; /* Authentication key description */
};
/*

48
fs/afs/security.c
View File

@@ -16,6 +16,30 @@
static DEFINE_HASHTABLE(afs_permits_cache, 10);
static DEFINE_SPINLOCK(afs_permits_lock);
static DEFINE_MUTEX(afs_key_lock);
/*
* Allocate a key to use as a placeholder for anonymous user security.
*/
static int afs_alloc_anon_key(struct afs_cell *cell)
{
struct key *key;
mutex_lock(&afs_key_lock);
if (!cell->anonymous_key) {
key = rxrpc_get_null_key(cell->key_desc);
if (!IS_ERR(key))
cell->anonymous_key = key;
}
mutex_unlock(&afs_key_lock);
if (IS_ERR(key))
return PTR_ERR(key);
_debug("anon key %p{%x}",
cell->anonymous_key, key_serial(cell->anonymous_key));
return 0;
}
/*
* get a key
@@ -23,11 +47,12 @@ static DEFINE_SPINLOCK(afs_permits_lock);
struct key *afs_request_key(struct afs_cell *cell)
{
struct key *key;
int ret;
_enter("{%x}", key_serial(cell->anonymous_key));
_enter("{%s}", cell->key_desc);
_debug("key %s", cell->anonymous_key->description);
key = request_key_net(&key_type_rxrpc, cell->anonymous_key->description,
_debug("key %s", cell->key_desc);
key = request_key_net(&key_type_rxrpc, cell->key_desc,
cell->net->net, NULL);
if (IS_ERR(key)) {
if (PTR_ERR(key) != -ENOKEY) {
@@ -35,6 +60,12 @@ struct key *afs_request_key(struct afs_cell *cell)
return key;
}
if (!cell->anonymous_key) {
ret = afs_alloc_anon_key(cell);
if (ret < 0)
return ERR_PTR(ret);
}
/* act as anonymous user */
_leave(" = {%x} [anon]", key_serial(cell->anonymous_key));
return key_get(cell->anonymous_key);
@@ -52,11 +83,10 @@ struct key *afs_request_key_rcu(struct afs_cell *cell)
{
struct key *key;
_enter("{%x}", key_serial(cell->anonymous_key));
_enter("{%s}", cell->key_desc);
_debug("key %s", cell->anonymous_key->description);
key = request_key_net_rcu(&key_type_rxrpc,
cell->anonymous_key->description,
_debug("key %s", cell->key_desc);
key = request_key_net_rcu(&key_type_rxrpc, cell->key_desc,
cell->net->net);
if (IS_ERR(key)) {
if (PTR_ERR(key) != -ENOKEY) {
@@ -65,6 +95,8 @@ struct key *afs_request_key_rcu(struct afs_cell *cell)
}
/* act as anonymous user */
if (!cell->anonymous_key)
return NULL; /* Need to allocate */
_leave(" = {%x} [anon]", key_serial(cell->anonymous_key));
return key_get(cell->anonymous_key);
} else {
@@ -408,7 +440,7 @@ int afs_permission(struct mnt_idmap *idmap, struct inode *inode,
if (mask & MAY_NOT_BLOCK) {
key = afs_request_key_rcu(vnode->volume->cell);
if (IS_ERR(key))
if (IS_ERR_OR_NULL(key))
return -ECHILD;
ret = -ECHILD;