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Message-ID: <CANn89iJT_dkpK2+9pAE376om6gDem7VKtCuALwPLc3AUWL8M8w@mail.gmail.com> Date: Thu, 30 Nov 2023 10:06:20 +0100 From: Eric Dumazet <edumazet@...gle.com> To: Lizhi Xu <lizhi.xu@...driver.com> Cc: almasrymina@...gle.com, davem@...emloft.net, hawk@...nel.org, ilias.apalodimas@...aro.org, kuba@...nel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzbot+f9f8efb58a4db2ca98d0@...kaller.appspotmail.com, syzkaller-bugs@...glegroups.com Subject: Re: [PATCH net-next] net: page_pool: fix null-ptr-deref in page_pool_unlist On Thu, Nov 30, 2023 at 9:58 AM Lizhi Xu <lizhi.xu@...driver.com> wrote: > > On Thu, 30 Nov 2023 09:29:04 +0100, Eric Dumazet <edumazet@...gle.com> wrote: > > > [Syz report] > > > 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 > > > do_syscall_x64 arch/x86/entry/common.c:51 [inline] > > > do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 > > > entry_SYSCALL_64_after_hwframe+0x63/0x6b > > > > > > [Analysis] > > > If "user.list" is initialized, the corresponding slow.netdev device must exist, > > > so before recycling "user.list", it is necessary to confirm that the "slow.netdev" > > > device is valid. > > > > > > [Fix] > > > Add slow.netdev != NULL check before delete "user.list". > > > > > > Fixes: 083772c9f972 ("net: page_pool: record pools per netdev") > > > Reported-by: syzbot+f9f8efb58a4db2ca98d0@...kaller.appspotmail.com > > > Signed-off-by: Lizhi Xu <lizhi.xu@...driver.com> > > > > > > > > I sent a fix already ? > > > > https://lore.kernel.org/netdev/CANn89i+6BuZA6AjocG_0zTkD1u=pNgZc_DpZMO=yUN=S1cHS3w@mail.gmail.com/ > > > > Please do not attribute to yourself work done by others, let me submit > > the fix formally, thanks. > What exists may not necessarily be right, and how do you prove that I saw your > fix before fixing it? > > You have only tested on syzbot, that's all. > This does not mean that others should refer to you for repairs, nor does it > prove that you have made repairs, and others cannot fix them. I am just saying I sent a fix already, and that it was sent a few minutes after the syzbot report was available. (You included syzbot+f9f8efb58a4db2ca98d0@...kaller.appspotmail.com in your report, meaning that you must have seen my patch) It is not because I sleep during night time that you can decide to use my work without any credits.
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