CVE-2024-35976

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

xsk: validate user input for XDP_{UMEM|COMPLETION}_FILL_RING

syzbot reported an illegal copy in xsk_setsockopt() [1]

Make sure to validate setsockopt() @optlen parameter.

[1]

BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]

BUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline]

BUG: KASAN: slab-out-of-bounds in xsk_setsockopt+0x909/0xa40 net/xdp/xsk.c:1420

Read of size 4 at addr ffff888028c6cde3 by task syz-executor.0/7549

CPU: 0 PID: 7549 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024

Call Trace:

<TASK>

__dump_stack lib/dump_stack.c:88 [inline]

dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114

print_address_description mm/kasan/report.c:377 [inline]

print_report+0x169/0x550 mm/kasan/report.c:488

kasan_report+0x143/0x180 mm/kasan/report.c:601

copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]

copy_from_sockptr include/linux/sockptr.h:55 [inline]

xsk_setsockopt+0x909/0xa40 net/xdp/xsk.c:1420

do_sock_setsockopt+0x3af/0x720 net/socket.c:2311

__sys_setsockopt+0x1ae/0x250 net/socket.c:2334

__do_sys_setsockopt net/socket.c:2343 [inline]

__se_sys_setsockopt net/socket.c:2340 [inline]

__x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340

do_syscall_64+0xfb/0x240

entry_SYSCALL_64_after_hwframe+0x6d/0x75

RIP: 0033:0x7fb40587de69

Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48

RSP: 002b:00007fb40665a0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036

RAX: ffffffffffffffda RBX: 00007fb4059abf80 RCX: 00007fb40587de69

RDX: 0000000000000005 RSI: 000000000000011b RDI: 0000000000000006

RBP: 00007fb4058ca47a R08: 0000000000000002 R09: 0000000000000000

R10: 0000000020001980 R11: 0000000000000246 R12: 0000000000000000

R13: 000000000000000b R14: 00007fb4059abf80 R15: 00007fff57ee4d08

</TASK>

Allocated by task 7549:

kasan_save_stack mm/kasan/common.c:47 [inline]

kasan_save_track+0x3f/0x80 mm/kasan/common.c:68

poison_kmalloc_redzone mm/kasan/common.c:370 [inline]

__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387

kasan_kmalloc include/linux/kasan.h:211 [inline]

__do_kmalloc_node mm/slub.c:3966 [inline]

__kmalloc+0x233/0x4a0 mm/slub.c:3979

kmalloc include/linux/slab.h:632 [inline]

__cgroup_bpf_run_filter_setsockopt+0xd2f/0x1040 kernel/bpf/cgroup.c:1869

do_sock_setsockopt+0x6b4/0x720 net/socket.c:2293

__sys_setsockopt+0x1ae/0x250 net/socket.c:2334

__do_sys_setsockopt net/socket.c:2343 [inline]

__se_sys_setsockopt net/socket.c:2340 [inline]

__x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340

do_syscall_64+0xfb/0x240

entry_SYSCALL_64_after_hwframe+0x6d/0x75

The buggy address belongs to the object at ffff888028c6cde0

which belongs to the cache kmalloc-8 of size 8

The buggy address is located 1 bytes to the right of

allocated 2-byte region [ffff888028c6cde0, ffff888028c6cde2)

The buggy address belongs to the physical page:

page:ffffea0000a31b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888028c6c9c0 pfn:0x28c6c

anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)

page_type: 0xffffffff()

raw: 00fff00000000800 ffff888014c41280 0000000000000000 dead000000000001

raw: ffff888028c6c9c0 0000000080800057 00000001ffffffff 0000000000000000

page dumped because: kasan: bad access detected

page_owner tracks the page as allocated

page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 6648, tgid 6644 (syz-executor.0), ts 133906047828, free_ts 133859922223

set_page_owner include/linux/page_owner.h:31 [inline]

post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533

prep_new_page mm/page_alloc.c:

---truncated---