CVE-2024-42272

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

sched: actct: take care of padding in struct zonesht_key

Blamed commit increased lookup key size from 2 bytes to 16 bytes, because zoneshtkey got a struct net pointer.

Make sure rhashtable_lookup() is not using the padding bytes which are not initialized.

BUG: KMSAN: uninit-value in rhtptrrcu include/linux/rhashtable.h:376 [inline] BUG: KMSAN: uninit-value in rhashtablelookup include/linux/rhashtable.h:607 [inline] BUG: KMSAN: uninit-value in rhashtablelookup include/linux/rhashtable.h:646 [inline] BUG: KMSAN: uninit-value in rhashtablelookupfast include/linux/rhashtable.h:672 [inline] BUG: KMSAN: uninit-value in tcfctflowtableget+0x611/0x2260 net/sched/actct.c:329 rhtptrrcu include/linux/rhashtable.h:376 [inline] _rhashtablelookup include/linux/rhashtable.h:607 [inline] rhashtablelookup include/linux/rhashtable.h:646 [inline] rhashtablelookupfast include/linux/rhashtable.h:672 [inline] tcfctflowtableget+0x611/0x2260 net/sched/actct.c:329 tcfctinit+0xa67/0x2890 net/sched/actct.c:1408 tcfactioninit1+0x6cc/0xb30 net/sched/actapi.c:1425 tcfactioninit+0x458/0xf00 net/sched/actapi.c:1488 tcfactionadd net/sched/actapi.c:2061 [inline] tcctlaction+0x4be/0x19d0 net/sched/actapi.c:2118 rtnetlinkrcvmsg+0x12fc/0x1410 net/core/rtnetlink.c:6647 netlinkrcvskb+0x375/0x650 net/netlink/afnetlink.c:2550 rtnetlinkrcv+0x34/0x40 net/core/rtnetlink.c:6665 netlinkunicastkernel net/netlink/afnetlink.c:1331 [inline] netlinkunicast+0xf52/0x1260 net/netlink/afnetlink.c:1357 netlinksendmsg+0x10da/0x11e0 net/netlink/afnetlink.c:1901 socksendmsgnosec net/socket.c:730 [inline] _socksendmsg+0x30f/0x380 net/socket.c:745 syssendmsg+0x877/0xb60 net/socket.c:2597 _syssendmsg+0x28d/0x3c0 net/socket.c:2651 _syssendmsg net/socket.c:2680 [inline] _dosyssendmsg net/socket.c:2689 [inline] _sesyssendmsg net/socket.c:2687 [inline] _x64syssendmsg+0x307/0x4a0 net/socket.c:2687 x64syscall+0x2dd6/0x3c10 arch/x86/include/generated/asm/syscalls64.h:47 dosyscallx64 arch/x86/entry/common.c:52 [inline] dosyscall64+0xcd/0x1e0 arch/x86/entry/common.c:83 entrySYSCALL64afterhwframe+0x77/0x7f

Local variable key created at: tcfctflowtableget+0x4a/0x2260 net/sched/actct.c:324 tcfctinit+0xa67/0x2890 net/sched/actct.c:1408