ptr_ring: do not block hard interrupts in ptr_ring_resize_multiple()

In the Linux kernel, the following vulnerability has been resolved:

ptr_ring: do not block hard interrupts in ptr_ring_resize_multiple()

Jakub added a lockdep_assert_no_hardirq() check in __page_pool_put_page()

to increase test coverage.

syzbot found a splat caused by hard irq blocking in

ptr_ring_resize_multiple() [1]

As current users of ptr_ring_resize_multiple() do not require

hard irqs being masked, replace it to only block BH.

Rename helpers to better reflect they are safe against BH only.

- ptr_ring_resize_multiple() to ptr_ring_resize_multiple_bh()

- skb_array_resize_multiple() to skb_array_resize_multiple_bh()

[1]

WARNING: CPU: 1 PID: 9150 at net/core/page_pool.c:709 __page_pool_put_page net/core/page_pool.c:709 [inline]

WARNING: CPU: 1 PID: 9150 at net/core/page_pool.c:709 page_pool_put_unrefed_netmem+0x157/0xa40 net/core/page_pool.c:780

Modules linked in:

CPU: 1 UID: 0 PID: 9150 Comm: syz.1.1052 Not tainted 6.11.0-rc3-syzkaller-00202-gf8669d7b5f5d #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024

RIP: 0010:__page_pool_put_page net/core/page_pool.c:709 [inline]

RIP: 0010:page_pool_put_unrefed_netmem+0x157/0xa40 net/core/page_pool.c:780

Code: 74 0e e8 7c aa fb f7 eb 43 e8 75 aa fb f7 eb 3c 65 8b 1d 38 a8 6a 76 31 ff 89 de e8 a3 ae fb f7 85 db 74 0b e8 5a aa fb f7 90 <0f> 0b 90 eb 1d 65 8b 1d 15 a8 6a 76 31 ff 89 de e8 84 ae fb f7 85

RSP: 0018:ffffc9000bda6b58 EFLAGS: 00010083

RAX: ffffffff8997e523 RBX: 0000000000000000 RCX: 0000000000040000

RDX: ffffc9000fbd0000 RSI: 0000000000001842 RDI: 0000000000001843

RBP: 0000000000000000 R08: ffffffff8997df2c R09: 1ffffd40003a000d

R10: dffffc0000000000 R11: fffff940003a000e R12: ffffea0001d00040

R13: ffff88802e8a4000 R14: dffffc0000000000 R15: 00000000ffffffff

FS: 00007fb7aaf716c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007fa15a0d4b72 CR3: 00000000561b0000 CR4: 00000000003506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Call Trace:

<TASK>

tun_ptr_free drivers/net/tun.c:617 [inline]

__ptr_ring_swap_queue include/linux/ptr_ring.h:571 [inline]

ptr_ring_resize_multiple_noprof include/linux/ptr_ring.h:643 [inline]

tun_queue_resize drivers/net/tun.c:3694 [inline]

tun_device_event+0xaaf/0x1080 drivers/net/tun.c:3714

notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93

call_netdevice_notifiers_extack net/core/dev.c:2032 [inline]

call_netdevice_notifiers net/core/dev.c:2046 [inline]

dev_change_tx_queue_len+0x158/0x2a0 net/core/dev.c:9024

do_setlink+0xff6/0x41f0 net/core/rtnetlink.c:2923

rtnl_setlink+0x40d/0x5a0 net/core/rtnetlink.c:3201

rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647

netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550