CVE-2024-26675

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ppp_async: limit MRU to 64K<br /> <br /> syzbot triggered a warning [1] in __alloc_pages():<br /> <br /> WARN_ON_ONCE_GFP(order &gt; MAX_PAGE_ORDER, gfp)<br /> <br /> Willem fixed a similar issue in commit c0a2a1b0d631 ("ppp: limit MRU to 64K")<br /> <br /> Adopt the same sanity check for ppp_async_ioctl(PPPIOCSMRU)<br /> <br /> [1]:<br /> <br /> WARNING: CPU: 1 PID: 11 at mm/page_alloc.c:4543 __alloc_pages+0x308/0x698 mm/page_alloc.c:4543<br /> Modules linked in:<br /> CPU: 1 PID: 11 Comm: kworker/u4:0 Not tainted 6.8.0-rc2-syzkaller-g41bccc98fb79 #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023<br /> Workqueue: events_unbound flush_to_ldisc<br /> pstate: 204000c5 (nzCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)<br /> pc : __alloc_pages+0x308/0x698 mm/page_alloc.c:4543<br /> lr : __alloc_pages+0xc8/0x698 mm/page_alloc.c:4537<br /> sp : ffff800093967580<br /> x29: ffff800093967660 x28: ffff8000939675a0 x27: dfff800000000000<br /> x26: ffff70001272ceb4 x25: 0000000000000000 x24: ffff8000939675c0<br /> x23: 0000000000000000 x22: 0000000000060820 x21: 1ffff0001272ceb8<br /> x20: ffff8000939675e0 x19: 0000000000000010 x18: ffff800093967120<br /> x17: ffff800083bded5c x16: ffff80008ac97500 x15: 0000000000000005<br /> x14: 1ffff0001272cebc x13: 0000000000000000 x12: 0000000000000000<br /> x11: ffff70001272cec1 x10: 1ffff0001272cec0 x9 : 0000000000000001<br /> x8 : ffff800091c91000 x7 : 0000000000000000 x6 : 000000000000003f<br /> x5 : 00000000ffffffff x4 : 0000000000000000 x3 : 0000000000000020<br /> x2 : 0000000000000008 x1 : 0000000000000000 x0 : ffff8000939675e0<br /> Call trace:<br /> __alloc_pages+0x308/0x698 mm/page_alloc.c:4543<br /> __alloc_pages_node include/linux/gfp.h:238 [inline]<br /> alloc_pages_node include/linux/gfp.h:261 [inline]<br /> __kmalloc_large_node+0xbc/0x1fc mm/slub.c:3926<br /> __do_kmalloc_node mm/slub.c:3969 [inline]<br /> __kmalloc_node_track_caller+0x418/0x620 mm/slub.c:4001<br /> kmalloc_reserve+0x17c/0x23c net/core/skbuff.c:590<br /> __alloc_skb+0x1c8/0x3d8 net/core/skbuff.c:651<br /> __netdev_alloc_skb+0xb8/0x3e8 net/core/skbuff.c:715<br /> netdev_alloc_skb include/linux/skbuff.h:3235 [inline]<br /> dev_alloc_skb include/linux/skbuff.h:3248 [inline]<br /> ppp_async_input drivers/net/ppp/ppp_async.c:863 [inline]<br /> ppp_asynctty_receive+0x588/0x186c drivers/net/ppp/ppp_async.c:341<br /> tty_ldisc_receive_buf+0x12c/0x15c drivers/tty/tty_buffer.c:390<br /> tty_port_default_receive_buf+0x74/0xac drivers/tty/tty_port.c:37<br /> receive_buf drivers/tty/tty_buffer.c:444 [inline]<br /> flush_to_ldisc+0x284/0x6e4 drivers/tty/tty_buffer.c:494<br /> process_one_work+0x694/0x1204 kernel/workqueue.c:2633<br /> process_scheduled_works kernel/workqueue.c:2706 [inline]<br /> worker_thread+0x938/0xef4 kernel/workqueue.c:2787<br /> kthread+0x288/0x310 kernel/kthread.c:388<br /> ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860