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Date: Thu, 30 Nov 2023 18:58:47 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, eric.dumazet@...il.com,
	syzbot+f9f8efb58a4db2ca98d0@...kaller.appspotmail.com
Subject: Re: [PATCH net-next] net: page_pool: fix general protection fault in
 page_pool_unlist

On Thu, Nov 30, 2023 at 09:22:59AM +0000, Eric Dumazet wrote:
> syzbot was able to trigger a crash [1] in page_pool_unlist()
> 
> page_pool_list() only inserts a page pool into a netdev page pool list
> if a netdev was set in params.
> 
> Even if the kzalloc() call in page_pool_create happens to initialize
> pool->user.list, I chose to be more explicit in page_pool_list()
> adding one INIT_HLIST_NODE().
> 
> We could test in page_pool_unlist() if netdev was set,
> but since netdev can be changed to lo, it seems more robust to
> check if pool->user.list is hashed  before calling hlist_del().
> 
> [1]
> 
> Illegal XDP return value 4294946546 on prog  (id 2) dev N/A, expect packet loss!
> general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
> CPU: 0 PID: 5064 Comm: syz-executor391 Not tainted 6.7.0-rc2-syzkaller-00533-ga379972973a8 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
> RIP: 0010:__hlist_del include/linux/list.h:988 [inline]
> RIP: 0010:hlist_del include/linux/list.h:1002 [inline]
> RIP: 0010:page_pool_unlist+0xd1/0x170 net/core/page_pool_user.c:342
> Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 90 00 00 00 4c 8b a3 f0 06 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 68 48 85 ed 49 89 2c 24 74 24 e8 1b ca 07 f9 48 8d
> RSP: 0018:ffffc900039ff768 EFLAGS: 00010246
> RAX: dffffc0000000000 RBX: ffff88814ae02000 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88814ae026f0
> RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff1d57fdc
> R10: ffffffff8eabfee3 R11: ffffffff8aa0008b R12: 0000000000000000
> R13: ffff88814ae02000 R14: dffffc0000000000 R15: 0000000000000001
> FS:  000055555717a380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000002555398 CR3: 0000000025044000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  __page_pool_destroy net/core/page_pool.c:851 [inline]
>  page_pool_release+0x507/0x6b0 net/core/page_pool.c:891
>  page_pool_destroy+0x1ac/0x4c0 net/core/page_pool.c:956
>  xdp_test_run_teardown net/bpf/test_run.c:216 [inline]
>  bpf_test_run_xdp_live+0x1578/0x1af0 net/bpf/test_run.c:388
>  bpf_prog_test_run_xdp+0x827/0x1530 net/bpf/test_run.c:1254
>  bpf_prog_test_run kernel/bpf/syscall.c:4041 [inline]
>  __sys_bpf+0x11bf/0x4920 kernel/bpf/syscall.c:5402
>  __do_sys_bpf kernel/bpf/syscall.c:5488 [inline]
>  __se_sys_bpf kernel/bpf/syscall.c:5486 [inline]
>  __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5486
> 
> Fixes: 083772c9f972 ("net: page_pool: record pools per netdev")
> Reported-and-tested-by: syzbot+f9f8efb58a4db2ca98d0@...kaller.appspotmail.com
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

This time Cc: to the list etc.

Tested-by: Andrew Lunn <andrew@...n.ch>

    Andrew

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