CVE-2021-46992

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> netfilter: nftables: avoid overflows in nft_hash_buckets()<br /> <br /> Number of buckets being stored in 32bit variables, we have to<br /> ensure that no overflows occur in nft_hash_buckets()<br /> <br /> syzbot injected a size == 0x40000000 and reported:<br /> <br /> UBSAN: shift-out-of-bounds in ./include/linux/log2.h:57:13<br /> shift exponent 64 is too large for 64-bit type &amp;#39;long unsigned int&amp;#39;<br /> CPU: 1 PID: 29539 Comm: syz-executor.4 Not tainted 5.12.0-rc7-syzkaller #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011<br /> Call Trace:<br /> __dump_stack lib/dump_stack.c:79 [inline]<br /> dump_stack+0x141/0x1d7 lib/dump_stack.c:120<br /> ubsan_epilogue+0xb/0x5a lib/ubsan.c:148<br /> __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:327<br /> __roundup_pow_of_two include/linux/log2.h:57 [inline]<br /> nft_hash_buckets net/netfilter/nft_set_hash.c:411 [inline]<br /> nft_hash_estimate.cold+0x19/0x1e net/netfilter/nft_set_hash.c:652<br /> nft_select_set_ops net/netfilter/nf_tables_api.c:3586 [inline]<br /> nf_tables_newset+0xe62/0x3110 net/netfilter/nf_tables_api.c:4322<br /> nfnetlink_rcv_batch+0xa09/0x24b0 net/netfilter/nfnetlink.c:488<br /> nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:612 [inline]<br /> nfnetlink_rcv+0x3af/0x420 net/netfilter/nfnetlink.c:630<br /> netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]<br /> netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338<br /> netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927<br /> sock_sendmsg_nosec net/socket.c:654 [inline]<br /> sock_sendmsg+0xcf/0x120 net/socket.c:674<br /> ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350<br /> ___sys_sendmsg+0xf3/0x170 net/socket.c:2404<br /> __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433<br /> do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46