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nbd: Fix use-after-free in pid_show

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I got issue as follows:
[  263.886511] BUG: KASAN: use-after-free in pid_show+0x11f/0x13f
[  263.888359] Read of size 4 at addr ffff8880bf0648c0 by task cat/746
[  263.890479] CPU: 0 PID: 746 Comm: cat Not tainted 4.19.90-dirty #140
[  263.893162] Call Trace:
[  263.893509]  dump_stack+0x108/0x15f
[  263.893999]  print_address_description+0xa5/0x372
[  263.894641]  kasan_report.cold+0x236/0x2a8
[  263.895696]  __asan_report_load4_noabort+0x25/0x30
[  263.896365]  pid_show+0x11f/0x13f
[  263.897422]  dev_attr_show+0x48/0x90
[  263.898361]  sysfs_kf_seq_show+0x24d/0x4b0
[  263.899479]  kernfs_seq_show+0x14e/0x1b0
[  263.900029]  seq_read+0x43f/0x1150
[  263.900499]  kernfs_fop_read+0xc7/0x5a0
[  263.903764]  vfs_read+0x113/0x350
[  263.904231]  ksys_read+0x103/0x270
[  263.905230]  __x64_sys_read+0x77/0xc0
[  263.906284]  do_syscall_64+0x106/0x360
[  263.906797]  entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reproduce this issue as follows:
1. nbd-server 8000 /tmp/disk
2. nbd-client localhost 8000 /dev/nbd1
3. cat /sys/block/nbd1/pid
Then trigger use-after-free in pid_show.

Reason is after do step '2', nbd-client progress is already exit. So
it's task_struct already freed.
To solve this issue, revert part of 6521d39a64b3's modify and remove
useless 'recv_task' member of nbd_device.

Fixes: 6521d39a64 ("nbd: Remove variable 'pid'")
Signed-off-by: Ye Bin <yebin10@huawei.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Link: https://lore.kernel.org/r/20211020073959.2679255-1-yebin10@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ye Bin 2021-10-20 15:39:59 +08:00 committed by Jens Axboe
parent a9a7e30fd9
commit 0c98057be9
1 changed files with 9 additions and 9 deletions
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18
drivers/block/nbd.c
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@ -122,10 +122,10 @@ struct nbd_device {
struct work_struct remove_work;
struct list_head list;
struct task_struct *task_recv;
struct task_struct *task_setup;
unsigned long flags;
pid_t pid; /* pid of nbd-client, if attached */
char *backend;
};
@ -223,7 +223,7 @@ static ssize_t pid_show(struct device *dev,
struct gendisk *disk = dev_to_disk(dev);
struct nbd_device *nbd = (struct nbd_device *)disk->private_data;
return sprintf(buf, "%d\n", task_pid_nr(nbd->task_recv));
return sprintf(buf, "%d\n", nbd->pid);
}
static const struct device_attribute pid_attr = {
@ -335,7 +335,7 @@ static int nbd_set_size(struct nbd_device *nbd, loff_t bytesize,
nbd->config->bytesize = bytesize;
nbd->config->blksize_bits = __ffs(blksize);
if (!nbd->task_recv)
if (!nbd->pid)
return 0;
if (nbd->config->flags & NBD_FLAG_SEND_TRIM) {
@ -1300,7 +1300,7 @@ static void nbd_config_put(struct nbd_device *nbd)
if (test_and_clear_bit(NBD_RT_HAS_PID_FILE,
&config->runtime_flags))
device_remove_file(disk_to_dev(nbd->disk), &pid_attr);
nbd->task_recv = NULL;
nbd->pid = 0;
if (test_and_clear_bit(NBD_RT_HAS_BACKEND_FILE,
&config->runtime_flags)) {
device_remove_file(disk_to_dev(nbd->disk), &backend_attr);
@ -1341,7 +1341,7 @@ static int nbd_start_device(struct nbd_device *nbd)
int num_connections = config->num_connections;
int error = 0, i;
if (nbd->task_recv)
if (nbd->pid)
return -EBUSY;
if (!config->socks)
return -EINVAL;
@ -1360,7 +1360,7 @@ static int nbd_start_device(struct nbd_device *nbd)
}
blk_mq_update_nr_hw_queues(&nbd->tag_set, config->num_connections);
nbd->task_recv = current;
nbd->pid = task_pid_nr(current);
nbd_parse_flags(nbd);
@ -1616,8 +1616,8 @@ static int nbd_dbg_tasks_show(struct seq_file *s, void *unused)
{
struct nbd_device *nbd = s->private;
if (nbd->task_recv)
seq_printf(s, "recv: %d\n", task_pid_nr(nbd->task_recv));
if (nbd->pid)
seq_printf(s, "recv: %d\n", nbd->pid);
return 0;
}
@ -2198,7 +2198,7 @@ static int nbd_genl_reconfigure(struct sk_buff *skb, struct genl_info *info)
mutex_lock(&nbd->config_lock);
config = nbd->config;
if (!test_bit(NBD_RT_BOUND, &config->runtime_flags) ||
!nbd->task_recv) {
!nbd->pid) {
dev_err(nbd_to_dev(nbd),
"not configured, cannot reconfigure\n");
ret = -EINVAL;