Re: [PATCH v2 bpf] net: Add rx_skb of kfree_skb to raw_tp_null_args[].

[Jiri Olsa <olsajiri@gmail.com>]

On Fri, Jan 31, 2025 at 07:01:42PM -0800, Kuniyuki Iwashima wrote:
> Yan Zhai reported a BPF prog could trigger a null-ptr-deref [0]
> in trace_kfree_skb if the prog does not check if rx_sk is NULL.
> 
> Commit c53795d48ee8 ("net: add rx_sk to trace_kfree_skb") added
> rx_sk to trace_kfree_skb, but rx_sk is optional and could be NULL.
> 
> Let's add kfree_skb to raw_tp_null_args[] to let the BPF verifier
> validate such a prog and prevent the issue.
> 
> Now we fail to load such a prog:
> 
>   libbpf: prog 'drop': -- BEGIN PROG LOAD LOG --
>   0: R1=ctx() R10=fp0
>   ; int BPF_PROG(drop, struct sk_buff *skb, void *location, @ kfree_skb_sk_null.bpf.c:21
>   0: (79) r3 = *(u64 *)(r1 +24)
>   func 'kfree_skb' arg3 has btf_id 5253 type STRUCT 'sock'
>   1: R1=ctx() R3_w=trusted_ptr_or_null_sock(id=1)
>   ; bpf_printk("sk: %d, %d\n", sk, sk->__sk_common.skc_family); @ kfree_skb_sk_null.bpf.c:24
>   1: (69) r4 = *(u16 *)(r3 +16)
>   R3 invalid mem access 'trusted_ptr_or_null_'
>   processed 2 insns (limit 1000000) max_states_per_insn 0 total_states 0 peak_states 0 mark_read 0
>   -- END PROG LOAD LOG --
> 
> Note this fix requires commit 838a10bd2ebf ("bpf: Augment raw_tp
> arguments with PTR_MAYBE_NULL").
> 
> [0]:
> BUG: kernel NULL pointer dereference, address: 0000000000000010
>  PF: supervisor read access in kernel mode
>  PF: error_code(0x0000) - not-present page
> PGD 0 P4D 0
> PREEMPT SMP
> CPU: 6 UID: 0 PID: 348 Comm: sshd Not tainted 6.12.11 #206
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> RIP: 0010:bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d
> Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 0f 1f 44 00 00 0f 1f 00 55 48 89 e5 48 8b 57 18 <48> 0f b7 4a 10 48 bf 0c 4f e2 c1 ad 90 ff ff be 0c 00 00 00 e8 0f
> RSP: 0018:ffffa86640b53da8 EFLAGS: 00010202
> RAX: 0000000000000001 RBX: ffffa866402d1000 RCX: 0000000000000002
> RDX: 0000000000000000 RSI: ffffa866402d1048 RDI: ffffa86640b53dc8
> RBP: ffffa86640b53da8 R08: 0000000000000000 R09: 9c908cd09b9c8c91
> R10: ffff90adc056b540 R11: 0000000000000002 R12: 0000000000000000
> R13: ffffa86640b53e88 R14: 0000000000000800 R15: fffffffffffffffe
> FS:  00007f2a27c2b480(0000) GS:ffff90b0efd00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000010 CR3: 0000000100e69004 CR4: 00000000001726f0
> Call Trace:
>  <TASK>
>  ? __die+0x1f/0x60
>  ? page_fault_oops+0x148/0x420
>  ? search_bpf_extables+0x5b/0x70
>  ? fixup_exception+0x27/0x2c0
>  ? exc_page_fault+0x75/0x170
>  ? asm_exc_page_fault+0x22/0x30
>  ? bpf_prog_5e21a6db8fcff1aa_drop+0x10/0x2d
>  bpf_trace_run4+0x68/0xd0
>  ? unix_stream_connect+0x1f4/0x6f0
>  sk_skb_reason_drop+0x90/0x120
>  unix_stream_connect+0x1f4/0x6f0
>  __sys_connect+0x7f/0xb0
>  __x64_sys_connect+0x14/0x20
>  do_syscall_64+0x47/0xc30
>  entry_SYSCALL_64_after_hwframe+0x4b/0x53
> RIP: 0033:0x7f2a27f296a0
> Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 80 3d 41 ff 0c 00 00 74 17 b8 2a 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 58 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 54
> RSP: 002b:00007ffe29274f58 EFLAGS: 00000202 ORIG_RAX: 000000000000002a
> 
> Fixes: c53795d48ee8 ("net: add rx_sk to trace_kfree_skb")
> Reported-by: Yan Zhai <yan@cloudflare.com>
> Closes: https://lore.kernel.org/netdev/Z50zebTRzI962e6X@debian.debian/
> Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
> ---
> v2:
>   * Add kfree_skb to raw_tp_null_args[] instead of annotating
>     rx_skb with __nullable

Acked-by: Jiri Olsa <jolsa@kernel.org>

thanks,
jirka

> 
> v1: https://lore.kernel.org/bpf/20250201001425.42377-1-kuniyu@amazon.com/
> ---
>  kernel/bpf/btf.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
> index 9de6acddd479..c3223e0db2f5 100644
> --- a/kernel/bpf/btf.c
> +++ b/kernel/bpf/btf.c
> @@ -6507,6 +6507,8 @@ static const struct bpf_raw_tp_null_args raw_tp_null_args[] = {
>  	/* rxrpc */
>  	{ "rxrpc_recvdata", 0x1 },
>  	{ "rxrpc_resend", 0x10 },
> +	/* skb */
> +	{"kfree_skb", 0x1000},
>  	/* sunrpc */
>  	{ "xs_stream_read_data", 0x1 },
>  	/* ... from xprt_cong_event event class */
> -- 
> 2.39.5 (Apple Git-154)
> 
>