diff options
| author | Eric Dumazet <edumazet@google.com> | 2018-12-20 15:28:56 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-12-20 19:23:22 -0800 |
| commit | f0c928d878e7d01b613c9ae5c971a6b1e473a938 (patch) | |
| tree | 3e4eb5bbe97f5e4528cd80f74024fd73586c28be /net | |
| parent | de985ec5c5bb80c7d2554fb7ebd97953630b7589 (diff) | |
| download | linux-f0c928d878e7d01b613c9ae5c971a6b1e473a938.tar.bz2 | |
tcp: fix a race in inet_diag_dump_icsk()
Alexei reported use after frees in inet_diag_dump_icsk() [1]
Because we use refcount_set() when various sockets are setup and
inserted into ehash, we also need to make sure inet_diag_dump_icsk()
wont race with the refcount_set() operations.
Jonathan Lemon sent a patch changing net_twsk_hashdance() but
other spots would need risky changes.
Instead, fix inet_diag_dump_icsk() as this bug came with
linux-4.10 only.
[1] Quoting Alexei :
First something iterating over sockets finds already freed tw socket:
refcount_t: increment on 0; use-after-free.
WARNING: CPU: 2 PID: 2738 at lib/refcount.c:153 refcount_inc+0x26/0x30
RIP: 0010:refcount_inc+0x26/0x30
RSP: 0018:ffffc90004c8fbc0 EFLAGS: 00010282
RAX: 000000000000002b RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88085ee9d680 RSI: ffff88085ee954c8 RDI: ffff88085ee954c8
RBP: ffff88010ecbd2c0 R08: 0000000000000000 R09: 000000000000174c
R10: ffffffff81e7c5a0 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8806ba9bf210 R14: ffffffff82304600 R15: ffff88010ecbd328
FS: 00007f81f5a7d700(0000) GS:ffff88085ee80000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f81e2a95000 CR3: 000000069b2eb006 CR4: 00000000003606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
inet_diag_dump_icsk+0x2b3/0x4e0 [inet_diag] // sock_hold(sk); in net/ipv4/inet_diag.c:1002
? kmalloc_large_node+0x37/0x70
? __kmalloc_node_track_caller+0x1cb/0x260
? __alloc_skb+0x72/0x1b0
? __kmalloc_reserve.isra.40+0x2e/0x80
__inet_diag_dump+0x3b/0x80 [inet_diag]
netlink_dump+0x116/0x2a0
netlink_recvmsg+0x205/0x3c0
sock_read_iter+0x89/0xd0
__vfs_read+0xf7/0x140
vfs_read+0x8a/0x140
SyS_read+0x3f/0xa0
do_syscall_64+0x5a/0x100
then a minute later twsk timer fires and hits two bad refcnts
for this freed socket:
refcount_t: decrement hit 0; leaking memory.
WARNING: CPU: 31 PID: 0 at lib/refcount.c:228 refcount_dec+0x2e/0x40
Modules linked in:
RIP: 0010:refcount_dec+0x2e/0x40
RSP: 0018:ffff88085f5c3ea8 EFLAGS: 00010296
RAX: 000000000000002c RBX: ffff88010ecbd2c0 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000003f
RBP: ffffc90003c77280 R08: 0000000000000000 R09: 00000000000017d3
R10: ffffffff81e7c5a0 R11: 0000000000000000 R12: ffffffff82ad2d80
R13: ffffffff8182de00 R14: ffff88085f5c3ef8 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88085f5c0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbe42685250 CR3: 0000000002209001 CR4: 00000000003606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
inet_twsk_kill+0x9d/0xc0 // inet_twsk_bind_unhash(tw, hashinfo);
call_timer_fn+0x29/0x110
run_timer_softirq+0x36b/0x3a0
refcount_t: underflow; use-after-free.
WARNING: CPU: 31 PID: 0 at lib/refcount.c:187 refcount_sub_and_test+0x46/0x50
RIP: 0010:refcount_sub_and_test+0x46/0x50
RSP: 0018:ffff88085f5c3eb8 EFLAGS: 00010296
RAX: 0000000000000026 RBX: ffff88010ecbd2c0 RCX: 000000000000083f
RDX: 0000000000000000 RSI: 00000000000000f6 RDI: 000000000000003f
RBP: ffff88010ecbd358 R08: 0000000000000000 R09: 000000000000185b
R10: ffffffff81e7c5a0 R11: 0000000000000000 R12: ffff88010ecbd358
R13: ffffffff8182de00 R14: ffff88085f5c3ef8 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88085f5c0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbe42685250 CR3: 0000000002209001 CR4: 00000000003606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
inet_twsk_put+0x12/0x20 // inet_twsk_put(tw);
call_timer_fn+0x29/0x110
run_timer_softirq+0x36b/0x3a0
Fixes: 67db3e4bfbc9 ("tcp: no longer hold ehash lock while calling tcp_get_info()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Alexei Starovoitov <ast@kernel.org>
Cc: Jonathan Lemon <jonathan.lemon@gmail.com>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/inet_diag.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c index 4e5bc4b2f14e..1a4e9ff02762 100644 --- a/net/ipv4/inet_diag.c +++ b/net/ipv4/inet_diag.c @@ -998,7 +998,9 @@ next_chunk: if (!inet_diag_bc_sk(bc, sk)) goto next_normal; - sock_hold(sk); + if (!refcount_inc_not_zero(&sk->sk_refcnt)) + goto next_normal; + num_arr[accum] = num; sk_arr[accum] = sk; if (++accum == SKARR_SZ) |