CVE-2024-46743

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

of/irq: Prevent device address out-of-bounds read in interrupt map walk

When of_irq_parse_raw() is invoked with a device address smaller than

the interrupt parent node (from #address-cells property), KASAN detects

the following out-of-bounds read when populating the initial match table

(dyndbg="func of_irq_parse_* +p"):

OF: of_irq_parse_one: dev=/soc@0/picasso/watchdog, index=0

OF: parent=/soc@0/pci@878000000000/gpio0@17,0, intsize=2

OF: intspec=4

OF: of_irq_parse_raw: ipar=/soc@0/pci@878000000000/gpio0@17,0, size=2

OF: -> addrsize=3

==================================================================

BUG: KASAN: slab-out-of-bounds in of_irq_parse_raw+0x2b8/0x8d0

Read of size 4 at addr ffffff81beca5608 by task bash/764

CPU: 1 PID: 764 Comm: bash Tainted: G O 6.1.67-484c613561-nokia_sm_arm64 #1

Hardware name: Unknown Unknown Product/Unknown Product, BIOS 2023.01-12.24.03-dirty 01/01/2023

Call trace:

dump_backtrace+0xdc/0x130

show_stack+0x1c/0x30

dump_stack_lvl+0x6c/0x84

print_report+0x150/0x448

kasan_report+0x98/0x140

__asan_load4+0x78/0xa0

of_irq_parse_raw+0x2b8/0x8d0

of_irq_parse_one+0x24c/0x270

parse_interrupts+0xc0/0x120

of_fwnode_add_links+0x100/0x2d0

fw_devlink_parse_fwtree+0x64/0xc0

device_add+0xb38/0xc30

of_device_add+0x64/0x90

of_platform_device_create_pdata+0xd0/0x170

of_platform_bus_create+0x244/0x600

of_platform_notify+0x1b0/0x254

blocking_notifier_call_chain+0x9c/0xd0

__of_changeset_entry_notify+0x1b8/0x230

__of_changeset_apply_notify+0x54/0xe4

of_overlay_fdt_apply+0xc04/0xd94

...

The buggy address belongs to the object at ffffff81beca5600

which belongs to the cache kmalloc-128 of size 128

The buggy address is located 8 bytes inside of

128-byte region [ffffff81beca5600, ffffff81beca5680)

The buggy address belongs to the physical page:

page:00000000230d3d03 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1beca4

head:00000000230d3d03 order:1 compound_mapcount:0 compound_pincount:0

flags: 0x8000000000010200(slab|head|zone=2)

raw: 8000000000010200 0000000000000000 dead000000000122 ffffff810000c300

raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000

page dumped because: kasan: bad access detected

Memory state around the buggy address:

ffffff81beca5500: 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc

ffffff81beca5580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc

>ffffff81beca5600: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc

^

ffffff81beca5680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc

ffffff81beca5700: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc

==================================================================

OF: -> got it !

Prevent the out-of-bounds read by copying the device address into a

buffer of sufficient size.