CVE-2024-26608: ksmbd: fix global oob in ksmbd_nl_policy

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

ksmbd: fix global oob in ksmbdnlpolicy

Similar to a reported issue (check the commit b33fb5b801c6 ("net: qualcomm: rmnet: fix global oob in rmnetpolicy"), my local fuzzer finds another global out-of-bounds read for policy ksmbdnlpolicy. See bug trace below:

================================================================== BUG: KASAN: global-out-of-bounds in validatenla lib/nlattr.c:386 [inline] BUG: KASAN: global-out-of-bounds in nlavalidateparse+0x24af/0x2750 lib/nlattr.c:600 Read of size 1 at addr ffffffff8f24b100 by task syz-executor.1/62810

CPU: 0 PID: 62810 Comm: syz-executor.1 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> dumpstack lib/dumpstack.c:88 [inline] dumpstacklvl+0x8b/0xb3 lib/dumpstack.c:106 printaddressdescription mm/kasan/report.c:284 [inline] printreport+0x172/0x475 mm/kasan/report.c:395 kasanreport+0xbb/0x1c0 mm/kasan/report.c:495 validatenla lib/nlattr.c:386 [inline] nlavalidateparse+0x24af/0x2750 lib/nlattr.c:600 nlaparse+0x3e/0x50 lib/nlattr.c:697 nlmsgparse include/net/netlink.h:748 [inline] genlfamilyrcvmsgattrsparse.constprop.0+0x1b0/0x290 net/netlink/genetlink.c:565 genlfamilyrcvmsgdoit+0xda/0x330 net/netlink/genetlink.c:734 genlfamilyrcvmsg net/netlink/genetlink.c:833 [inline] genlrcvmsg+0x441/0x780 net/netlink/genetlink.c:850 netlinkrcvskb+0x14f/0x410 net/netlink/afnetlink.c:2540 genlrcv+0x24/0x40 net/netlink/genetlink.c:861 netlinkunicastkernel net/netlink/afnetlink.c:1319 [inline] netlinkunicast+0x54e/0x800 net/netlink/afnetlink.c:1345 netlinksendmsg+0x930/0xe50 net/netlink/afnetlink.c:1921 socksendmsgnosec net/socket.c:714 [inline] socksendmsg+0x154/0x190 net/socket.c:734 syssendmsg+0x6df/0x840 net/socket.c:2482 syssendmsg+0x110/0x1b0 net/socket.c:2536 syssendmsg+0xf3/0x1c0 net/socket.c:2565 dosyscallx64 arch/x86/entry/common.c:50 [inline] dosyscall64+0x3b/0x90 arch/x86/entry/common.c:80 entrySYSCALL64afterhwframe+0x63/0xcd RIP: 0033:0x7fdd66a8f359 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:00007fdd65e00168 EFLAGS: 00000246 ORIGRAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fdd66bbcf80 RCX: 00007fdd66a8f359 RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000003 RBP: 00007fdd66ada493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc84b81aff R14: 00007fdd65e00300 R15: 0000000000022000 </TASK>

The buggy address belongs to the variable: ksmbdnlpolicy+0x100/0xa80

The buggy address belongs to the physical page: page:0000000034f47940 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1ccc4b flags: 0x200000000001000(reserved|node=0|zone=2) raw: 0200000000001000 ffffea00073312c8 ffffea00073312c8 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected

Memory state around the buggy address: ffffffff8f24b000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff8f24b080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff8f24b100: f9 f9 f9 f9 00 00 f9 f9 f9 f9 f9 f9 00 00 07 f9 ^ ffffffff8f24b180: f9 f9 f9 f9 00 05 f9 f9 f9 f9 f9 f9 00 00 00 05 ffffffff8f24b200: f9 f9 f9 f9 00 00 03 f9 f9 f9 f9 f9 00 00 04 f9 ==================================================================

To fix it, add a placeholder named KSMBDEVENTMAX and let KSMBDEVENTMAX to be its original value - 1 according to what other netlink families do. Also change two sites that refer the KSMBDEVENTMAX to correct value.