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tls: fix NULL pointer dereference on poll 

While hacking on kTLS, I ran into the following panic from an
unprivileged netserver / netperf TCP session:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
  PGD 800000037f378067 P4D 800000037f378067 PUD 3c0e61067 PMD 0
  Oops: 0010 [#1] SMP KASAN PTI
  CPU: 1 PID: 2289 Comm: netserver Not tainted 4.17.0+ #139
  Hardware name: LENOVO 20FBCTO1WW/20FBCTO1WW, BIOS N1FET47W (1.21 ) 11/28/2016
  RIP: 0010:          (null)
  Code: Bad RIP value.
  RSP: 0018:ffff88036abcf740 EFLAGS: 00010246
  RAX: dffffc0000000000 RBX: ffff88036f5f6800 RCX: 1ffff1006debed26
  RDX: ffff88036abcf920 RSI: ffff8803cb1a4f00 RDI: ffff8803c258c280
  RBP: ffff8803c258c280 R08: ffff8803c258c280 R09: ffffed006f559d48
  R10: ffff88037aacea43 R11: ffffed006f559d49 R12: ffff8803c258c280
  R13: ffff8803cb1a4f20 R14: 00000000000000db R15: ffffffffc168a350
  FS:  00007f7e631f4700(0000) GS:ffff8803d1c80000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: ffffffffffffffd6 CR3: 00000003ccf64005 CR4: 00000000003606e0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Call Trace:
   ? tls_sw_poll+0xa4/0x160 [tls]
   ? sock_poll+0x20a/0x680
   ? do_select+0x77b/0x11a0
   ? poll_schedule_timeout.constprop.12+0x130/0x130
   ? pick_link+0xb00/0xb00
   ? read_word_at_a_time+0x13/0x20
   ? vfs_poll+0x270/0x270
   ? deref_stack_reg+0xad/0xe0
   ? __read_once_size_nocheck.constprop.6+0x10/0x10
  [...]

Debugging further, it turns out that calling into ctx->sk_poll() is
invalid since sk_poll itself is NULL which was saved from the original
TCP socket in order for tls_sw_poll() to invoke it.

Looks like the recent conversion from poll to poll_mask callback started
in 1525242310 ("net: add support for ->poll_mask in proto_ops") missed
to eventually convert kTLS, too: TCP's ->poll was converted over to the
->poll_mask in commit 2c7d3daceb ("net/tcp: convert to ->poll_mask")
and therefore kTLS wrongly saved the ->poll old one which is now NULL.

Convert kTLS over to use ->poll_mask instead. Also instead of POLLIN |
POLLRDNORM use the proper EPOLLIN | EPOLLRDNORM bits as the case in
tcp_poll_mask() as well that is mangled here.

Fixes: 2c7d3daceb ("net/tcp: convert to ->poll_mask")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Watson <davejwatson@fb.com>
Tested-by: Dave Watson <davejwatson@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2018-06-11 23:22:04 +02:00 committed by David S. Miller
parent a08ce73ba0
commit f6fadff33e
3 changed files with 12 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/net/tls.h
View File

@ -109,8 +109,7 @@ struct tls_sw_context_rx {
struct strparser strp;
void (*saved_data_ready)(struct sock *sk);
unsigned int (*sk_poll)(struct file *file, struct socket *sock,
struct poll_table_struct *wait);
__poll_t (*sk_poll_mask)(struct socket *sock, __poll_t events);
struct sk_buff *recv_pkt;
u8 control;
bool decrypted;
@ -225,8 +224,7 @@ void tls_sw_free_resources_tx(struct sock *sk);
void tls_sw_free_resources_rx(struct sock *sk);
int tls_sw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
int nonblock, int flags, int *addr_len);
unsigned int tls_sw_poll(struct file *file, struct socket *sock,
struct poll_table_struct *wait);
__poll_t tls_sw_poll_mask(struct socket *sock, __poll_t events);
ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
struct pipe_inode_info *pipe,
size_t len, unsigned int flags);

2
net/tls/tls_main.c
View File

@ -712,7 +712,7 @@ static int __init tls_register(void)
build_protos(tls_prots[TLSV4], &tcp_prot);
tls_sw_proto_ops = inet_stream_ops;
tls_sw_proto_ops.poll = tls_sw_poll;
tls_sw_proto_ops.poll_mask = tls_sw_poll_mask;
tls_sw_proto_ops.splice_read = tls_sw_splice_read;
#ifdef CONFIG_TLS_DEVICE

19
net/tls/tls_sw.c
View File

@ -915,23 +915,22 @@ ssize_t tls_sw_splice_read(struct socket *sock, loff_t *ppos,
return copied ? : err;
}
unsigned int tls_sw_poll(struct file *file, struct socket *sock,
struct poll_table_struct *wait)
__poll_t tls_sw_poll_mask(struct socket *sock, __poll_t events)
{
unsigned int ret;
struct sock *sk = sock->sk;
struct tls_context *tls_ctx = tls_get_ctx(sk);
struct tls_sw_context_rx *ctx = tls_sw_ctx_rx(tls_ctx);
__poll_t mask;
/* Grab POLLOUT and POLLHUP from the underlying socket */
ret = ctx->sk_poll(file, sock, wait);
/* Grab EPOLLOUT and EPOLLHUP from the underlying socket */
mask = ctx->sk_poll_mask(sock, events);
/* Clear POLLIN bits, and set based on recv_pkt */
ret &= ~(POLLIN | POLLRDNORM);
/* Clear EPOLLIN bits, and set based on recv_pkt */
mask &= ~(EPOLLIN | EPOLLRDNORM);
if (ctx->recv_pkt)
ret |= POLLIN | POLLRDNORM;
mask |= EPOLLIN | EPOLLRDNORM;
return ret;
return mask;
}
static int tls_read_size(struct strparser *strp, struct sk_buff *skb)
@ -1188,7 +1187,7 @@ int tls_set_sw_offload(struct sock *sk, struct tls_context *ctx, int tx)
sk->sk_data_ready = tls_data_ready;
write_unlock_bh(&sk->sk_callback_lock);
sw_ctx_rx->sk_poll = sk->sk_socket->ops->poll;
sw_ctx_rx->sk_poll_mask = sk->sk_socket->ops->poll_mask;
strp_check_rcv(&sw_ctx_rx->strp);
}