CVE-2024-36915

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

nfc: llcp: fix nfcllcpsetsockopt() unsafe copies

syzbot reported unsafe calls to copyfromsockptr() [1]

Use copysafefrom_sockptr() instead.

[1]

BUG: KASAN: slab-out-of-bounds in copyfromsockptroffset include/linux/sockptr.h:49 [inline] BUG: KASAN: slab-out-of-bounds in copyfromsockptr include/linux/sockptr.h:55 [inline] BUG: KASAN: slab-out-of-bounds in nfcllcpsetsockopt+0x6c2/0x850 net/nfc/llcpsock.c:255 Read of size 4 at addr ffff88801caa1ec3 by task syz-executor459/5078

CPU: 0 PID: 5078 Comm: syz-executor459 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> __dumpstack lib/dumpstack.c:88 [inline] dump_stacklvl+0x241/0x360 lib/dumpstack.c:114 printaddressdescription mm/kasan/report.c:377 [inline] printreport+0x169/0x550 mm/kasan/report.c:488 kasanreport+0x143/0x180 mm/kasan/report.c:601 copyfromsockptroffset include/linux/sockptr.h:49 [inline] copyfromsockptr include/linux/sockptr.h:55 [inline] nfcllcpsetsockopt+0x6c2/0x850 net/nfc/llcpsock.c:255 dosocksetsockopt+0x3b1/0x720 net/socket.c:2311 __sys_setsockopt+0x1ae/0x250 net/socket.c:2334 __dosyssetsockopt net/socket.c:2343 [inline] __sesyssetsockopt net/socket.c:2340 [inline] _x64syssetsockopt+0xb5/0xd0 net/socket.c:2340 dosyscall64+0xfd/0x240 entrySYSCALL64afterhwframe+0x6d/0x75 RIP: 0033:0x7f7fac07fd89 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 18 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:00007fff660eb788 EFLAGS: 00000246 ORIGRAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f7fac07fd89 RDX: 0000000000000000 RSI: 0000000000000118 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000000000 R10: 0000000020000a80 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000