[PATCH 5.18 023/102] net: rose: fix UAF bugs caused by timer handler

Greg Kroah-Hartman
2022-07-05T12:31:13Z

From: Duoming Zhou <duoming@zju.edu.cn>

commit 9cc02ede696272c5271a401e4f27c262359bc2f6 upstream.

There are UAF bugs in rose_heartbeat_expiry(), rose_timer_expiry()
and rose_idletimer_expiry(). The root cause is that del_timer()
could not stop the timer handler that is running and the refcount
of sock is not managed properly.

One of the UAF bugs is shown below:

(thread 1) | (thread 2)
| rose_bind
| rose_connect
| rose_start_heartbeat
rose_release | (wait a time)
case ROSE_STATE_0 |
rose_destroy_socket | rose_heartbeat_expiry
rose_stop_heartbeat |
sock_put(sk) | ...
sock_put(sk) // FREE |
| bh_lock_sock(sk) // USE

The sock is deallocated by sock_put() in rose_release() and
then used by bh_lock_sock() in rose_heartbeat_expiry().

Although rose_destroy_socket() calls rose_stop_heartbeat(),
it could not stop the timer that is running.

The KASAN report triggered by POC is shown below:

BUG: KASAN: use-after-free in _raw_spin_lock+0x5a/0x110
Write of size 4 at addr ffff88800ae59098 by task swapper/3/0
...
Call Trace:
<IRQ>
dump_stack_lvl+0xbf/0xee
print_address_description+0x7b/0x440
print_report+0x101/0x230
? irq_work_single+0xbb/0x140
? _raw_spin_lock+0x5a/0x110
kasan_report+0xed/0x120
? _raw_spin_lock+0x5a/0x110
kasan_check_range+0x2bd/0x2e0
_raw_spin_lock+0x5a/0x110
rose_heartbeat_expiry+0x39/0x370
? rose_start_heartbeat+0xb0/0xb0
call_timer_fn+0x2d/0x1c0
? rose_start_heartbeat+0xb0/0xb0
expire_timers+0x1f3/0x320
__run_timers+0x3ff/0x4d0
run_timer_softirq+0x41/0x80
__do_softirq+0x233/0x544
irq_exit_rcu+0x41/0xa0
sysvec_apic_timer_interrupt+0x8c/0xb0
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:default_idle+0xb/0x10
RSP: 0018:ffffc9000012fea0 EFLAGS: 00000202
RAX: 000000000000bcae RBX: ffff888006660f00 RCX: 000000000000bcae
RDX: 0000000000000001 RSI: ffffffff843a11c0 RDI: ffffffff843a1180
RBP: dffffc0000000000 R08: dffffc0000000000 R09: ffffed100da36d46
R10: dfffe9100da36d47 R11: ffffffff83cf0950 R12: 0000000000000000
R13: 1ffff11000ccc1e0 R14: ffffffff8542af28 R15: dffffc0000000000
...
Allocated by task 146:
__kasan_kmalloc+0xc4/0xf0
sk_prot_alloc+0xdd/0x1a0
sk_alloc+0x2d/0x4e0
rose_create+0x7b/0x330
__sock_create+0x2dd/0x640
__sys_socket+0xc7/0x270
__x64_sys_socket+0x71/0x80
do_syscall_64+0x43/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0

Freed by task 152:
kasan_set_track+0x4c/0x70
kasan_set_free_info+0x1f/0x40
____kasan_slab_free+0x124/0x190
kfree+0xd3/0x270
__sk_destruct+0x314/0x460
rose_release+0x2fa/0x3b0
sock_close+0xcb/0x230
__fput+0x2d9/0x650
task_work_run+0xd6/0x160
exit_to_user_mode_loop+0xc7/0xd0
exit_to_user_mode_prepare+0x4e/0x80
syscall_exit_to_user_mode+0x20/0x40
do_syscall_64+0x4f/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0

This patch adds refcount of sock when we use functions
such as rose_start_heartbeat() and so on to start timer,
and decreases the refcount of sock when timer is finished
or deleted by functions such as rose_stop_heartbeat()
and so on. As a result, the UAF bugs could be mitigated.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Tested-by: Duoming Zhou <duoming@zju.edu.cn>
Link: https://lore.kernel.org/r/20220629002640.5693-1-duoming@zju.edu.cn
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/rose/rose_timer.c | 34 +++++++++++++++++++---------------
1 file changed, 19 insertions(+), 15 deletions(-)

--- a/net/rose/rose_timer.c
+++ b/net/rose/rose_timer.c
@@ -31,89 +31,89 @@ static void rose_idletimer_expiry(struct

void rose_start_heartbeat(struct sock *sk)
{
- del_timer(&sk->sk_timer);
+ sk_stop_timer(sk, &sk->sk_timer);

sk->sk_timer.function = rose_heartbeat_expiry;
sk->sk_timer.expires = jiffies + 5 * HZ;

- add_timer(&sk->sk_timer);
+ sk_reset_timer(sk, &sk->sk_timer, sk->sk_timer.expires);
}

void rose_start_t1timer(struct sock *sk)
{
struct rose_sock *rose = rose_sk(sk);

- del_timer(&rose->timer);
+ sk_stop_timer(sk, &rose->timer);

rose->timer.function = rose_timer_expiry;
rose->timer.expires = jiffies + rose->t1;

- add_timer(&rose->timer);
+ sk_reset_timer(sk, &rose->timer, rose->timer.expires);
}

void rose_start_t2timer(struct sock *sk)
{
struct rose_sock *rose = rose_sk(sk);

- del_timer(&rose->timer);
+ sk_stop_timer(sk, &rose->timer);

rose->timer.function = rose_timer_expiry;
rose->timer.expires = jiffies + rose->t2;

- add_timer(&rose->timer);
+ sk_reset_timer(sk, &rose->timer, rose->timer.expires);
}

void rose_start_t3timer(struct sock *sk)
{
struct rose_sock *rose = rose_sk(sk);

- del_timer(&rose->timer);
+ sk_stop_timer(sk, &rose->timer);

rose->timer.function = rose_timer_expiry;
rose->timer.expires = jiffies + rose->t3;

- add_timer(&rose->timer);
+ sk_reset_timer(sk, &rose->timer, rose->timer.expires);
}

void rose_start_hbtimer(struct sock *sk)
{
struct rose_sock *rose = rose_sk(sk);

- del_timer(&rose->timer);
+ sk_stop_timer(sk, &rose->timer);

rose->timer.function = rose_timer_expiry;
rose->timer.expires = jiffies + rose->hb;

- add_timer(&rose->timer);
+ sk_reset_timer(sk, &rose->timer, rose->timer.expires);
}

void rose_start_idletimer(struct sock *sk)
{
struct rose_sock *rose = rose_sk(sk);

- del_timer(&rose->idletimer);
+ sk_stop_timer(sk, &rose->idletimer);

if (rose->idle > 0) {
rose->idletimer.function = rose_idletimer_expiry;
rose->idletimer.expires = jiffies + rose->idle;

- add_timer(&rose->idletimer);
+ sk_reset_timer(sk, &rose->idletimer, rose->idletimer.expires);
}
}

void rose_stop_heartbeat(struct sock *sk)
{
- del_timer(&sk->sk_timer);
+ sk_stop_timer(sk, &sk->sk_timer);
}

void rose_stop_timer(struct sock *sk)
{
- del_timer(&rose_sk(sk)->timer);
+ sk_stop_timer(sk, &rose_sk(sk)->timer);
}

void rose_stop_idletimer(struct sock *sk)
{
- del_timer(&rose_sk(sk)->idletimer);
+ sk_stop_timer(sk, &rose_sk(sk)->idletimer);
}

static void rose_heartbeat_expiry(struct timer_list *t)
@@ -130,6 +130,7 @@ static void rose_heartbeat_expiry(struct
(sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_DEAD))) {
bh_unlock_sock(sk);
rose_destroy_socket(sk);
+ sock_put(sk);
return;
}
break;
@@ -152,6 +153,7 @@ static void rose_heartbeat_expiry(struct

rose_start_heartbeat(sk);
bh_unlock_sock(sk);
+ sock_put(sk);
}

static void rose_timer_expiry(struct timer_list *t)
@@ -181,6 +183,7 @@ static void rose_timer_expiry(struct tim
break;
}
bh_unlock_sock(sk);
+ sock_put(sk);
}

static void rose_idletimer_expiry(struct timer_list *t)
@@ -205,4 +208,5 @@ static void rose_idletimer_expiry(struct
sock_set_flag(sk, SOCK_DEAD);
}
bh_unlock_sock(sk);
+ sock_put(sk);
}