Oracle Linux: (CVE-2024-26675) ELSA-2024-4211: kernel security and bug fix update

Description

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

ppp_async: limit MRU to 64K

syzbot triggered a warning [1] in __alloc_pages():

WARN_ON_ONCE_GFP(order > MAX_PAGE_ORDER, gfp)

Willem fixed a similar issue in commit c0a2a1b0d631 ("ppp: limit MRU to 64K")

Adopt the same sanity check for ppp_async_ioctl(PPPIOCSMRU)

[1]:

WARNING: CPU: 1 PID: 11 at mm/page_alloc.c:4543 __alloc_pages+0x308/0x698 mm/page_alloc.c:4543

Modules linked in:

CPU: 1 PID: 11 Comm: kworker/u4:0 Not tainted 6.8.0-rc2-syzkaller-g41bccc98fb79 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023

Workqueue: events_unbound flush_to_ldisc

pstate: 204000c5 (nzCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)

pc : __alloc_pages+0x308/0x698 mm/page_alloc.c:4543

lr : __alloc_pages+0xc8/0x698 mm/page_alloc.c:4537

sp : ffff800093967580

x29: ffff800093967660 x28: ffff8000939675a0 x27: dfff800000000000

x26: ffff70001272ceb4 x25: 0000000000000000 x24: ffff8000939675c0

x23: 0000000000000000 x22: 0000000000060820 x21: 1ffff0001272ceb8

x20: ffff8000939675e0 x19: 0000000000000010 x18: ffff800093967120

x17: ffff800083bded5c x16: ffff80008ac97500 x15: 0000000000000005

x14: 1ffff0001272cebc x13: 0000000000000000 x12: 0000000000000000

x11: ffff70001272cec1 x10: 1ffff0001272cec0 x9 : 0000000000000001

x8 : ffff800091c91000 x7 : 0000000000000000 x6 : 000000000000003f

x5 : 00000000ffffffff x4 : 0000000000000000 x3 : 0000000000000020

x2 : 0000000000000008 x1 : 0000000000000000 x0 : ffff8000939675e0

Call trace:

__alloc_pages+0x308/0x698 mm/page_alloc.c:4543

__alloc_pages_node include/linux/gfp.h:238 [inline]

alloc_pages_node include/linux/gfp.h:261 [inline]

__kmalloc_large_node+0xbc/0x1fc mm/slub.c:3926

__do_kmalloc_node mm/slub.c:3969 [inline]

__kmalloc_node_track_caller+0x418/0x620 mm/slub.c:4001

kmalloc_reserve+0x17c/0x23c net/core/skbuff.c:590

__alloc_skb+0x1c8/0x3d8 net/core/skbuff.c:651

__netdev_alloc_skb+0xb8/0x3e8 net/core/skbuff.c:715

netdev_alloc_skb include/linux/skbuff.h:3235 [inline]

dev_alloc_skb include/linux/skbuff.h:3248 [inline]

ppp_async_input drivers/net/ppp/ppp_async.c:863 [inline]

ppp_asynctty_receive+0x588/0x186c drivers/net/ppp/ppp_async.c:341

tty_ldisc_receive_buf+0x12c/0x15c drivers/tty/tty_buffer.c:390

tty_port_default_receive_buf+0x74/0xac drivers/tty/tty_port.c:37

receive_buf drivers/tty/tty_buffer.c:444 [inline]

flush_to_ldisc+0x284/0x6e4 drivers/tty/tty_buffer.c:494

process_one_work+0x694/0x1204 kernel/workqueue.c:2633

process_scheduled_works kernel/workqueue.c:2706 [inline]

worker_thread+0x938/0xef4 kernel/workqueue.c:2787

kthread+0x288/0x310 kernel/kthread.c:388

ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860