CVE-2024-26597

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

net: qualcomm: rmnet: fix global oob in rmnet_policy

The variable rmnet_link_ops assign a *bigger* maxtype which leads to a

global out-of-bounds read when parsing the netlink attributes. See bug

trace below:

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

BUG: KASAN: global-out-of-bounds in validate_nla lib/nlattr.c:386 [inline]

BUG: KASAN: global-out-of-bounds in __nla_validate_parse+0x24af/0x2750 lib/nlattr.c:600

Read of size 1 at addr ffffffff92c438d0 by task syz-executor.6/84207

CPU: 0 PID: 84207 Comm: syz-executor.6 Tainted: G N 6.1.0 #3

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014

Call Trace:

<TASK>

__dump_stack lib/dump_stack.c:88 [inline]

dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106

print_address_description mm/kasan/report.c:284 [inline]

print_report+0x172/0x475 mm/kasan/report.c:395

kasan_report+0xbb/0x1c0 mm/kasan/report.c:495

validate_nla lib/nlattr.c:386 [inline]

__nla_validate_parse+0x24af/0x2750 lib/nlattr.c:600

__nla_parse+0x3e/0x50 lib/nlattr.c:697

nla_parse_nested_deprecated include/net/netlink.h:1248 [inline]

__rtnl_newlink+0x50a/0x1880 net/core/rtnetlink.c:3485

rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3594

rtnetlink_rcv_msg+0x43c/0xd70 net/core/rtnetlink.c:6091

netlink_rcv_skb+0x14f/0x410 net/netlink/af_netlink.c:2540

netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]

netlink_unicast+0x54e/0x800 net/netlink/af_netlink.c:1345

netlink_sendmsg+0x930/0xe50 net/netlink/af_netlink.c:1921

sock_sendmsg_nosec net/socket.c:714 [inline]

sock_sendmsg+0x154/0x190 net/socket.c:734

____sys_sendmsg+0x6df/0x840 net/socket.c:2482

___sys_sendmsg+0x110/0x1b0 net/socket.c:2536

__sys_sendmsg+0xf3/0x1c0 net/socket.c:2565

do_syscall_x64 arch/x86/entry/common.c:50 [inline]

do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80

entry_SYSCALL_64_after_hwframe+0x63/0xcd

RIP: 0033:0x7fdcf2072359

Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48

RSP: 002b:00007fdcf13e3168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e

RAX: ffffffffffffffda RBX: 00007fdcf219ff80 RCX: 00007fdcf2072359

RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003

RBP: 00007fdcf20bd493 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000

R13: 00007fffbb8d7bdf R14: 00007fdcf13e3300 R15: 0000000000022000

</TASK>

The buggy address belongs to the variable:

rmnet_policy+0x30/0xe0

The buggy address belongs to the physical page:

page:0000000065bdeb3c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x155243

flags: 0x200000000001000(reserved|node=0|zone=2)

raw: 0200000000001000 ffffea00055490c8 ffffea00055490c8 0000000000000000

raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000

page dumped because: kasan: bad access detected

Memory state around the buggy address:

ffffffff92c43780: f9 f9 f9 f9 00 00 00 02 f9 f9 f9 f9 00 00 00 07

ffffffff92c43800: f9 f9 f9 f9 00 00 00 05 f9 f9 f9 f9 06 f9 f9 f9

>ffffffff92c43880: f9 f9 f9 f9 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9

^

ffffffff92c43900: 00 00 00 00 00 00 00 00 07 f9 f9 f9 f9 f9 f9 f9

ffffffff92c43980: 00 00 00 07 f9 f9 f9 f9 00 00 00 05 f9 f9 f9 f9

According to the comment of `nla_parse_nested_deprecated`, the maxtype

should be len(destination array) - 1. Hence use `IFLA_RMNET_MAX` here.