CVE-2024-45001

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

net: mana: Fix RX buf alloc_size alignment and atomic op panic

The MANA driver's RX buffer alloc_size is passed into napi_build_skb() to

create SKB. skb_shinfo(skb) is located at the end of skb, and its alignment

is affected by the alloc_size passed into napi_build_skb(). The size needs

to be aligned properly for better performance and atomic operations.

Otherwise, on ARM64 CPU, for certain MTU settings like 4000, atomic

operations may panic on the skb_shinfo(skb)->dataref due to alignment fault.

To fix this bug, add proper alignment to the alloc_size calculation.

Sample panic info:

[ 253.298819] Unable to handle kernel paging request at virtual address ffff000129ba5cce

[ 253.300900] Mem abort info:

[ 253.301760] ESR = 0x0000000096000021

[ 253.302825] EC = 0x25: DABT (current EL), IL = 32 bits

[ 253.304268] SET = 0, FnV = 0

[ 253.305172] EA = 0, S1PTW = 0

[ 253.306103] FSC = 0x21: alignment fault

Call trace:

__skb_clone+0xfc/0x198

skb_clone+0x78/0xe0

raw6_local_deliver+0xfc/0x228

ip6_protocol_deliver_rcu+0x80/0x500

ip6_input_finish+0x48/0x80

ip6_input+0x48/0xc0

ip6_sublist_rcv_finish+0x50/0x78

ip6_sublist_rcv+0x1cc/0x2b8

ipv6_list_rcv+0x100/0x150

__netif_receive_skb_list_core+0x180/0x220

netif_receive_skb_list_internal+0x198/0x2a8

__napi_poll+0x138/0x250

net_rx_action+0x148/0x330

handle_softirqs+0x12c/0x3a0