Hi all,
While fuzzing with trinity inside a KVM tools guest running the latest -next kernel
I've hit:
[ 828.386074] UBSAN: Undefined behaviour in crypto/algif_hash.c:185:7
[ 828.386811] variable length array bound value 0 <= 0
[ 828.387606] CPU: 1 PID: 17792 Comm: trinity-c313 Not tainted 4.4.0-next-20160122-sasha-00019-gd2a2eb4-dirty #2819
[ 828.388957] 1ffff10038e06f65 0000000087690421 ffff8801c7037ba8 ffffffffa34474f1
[ 828.394655] 0000000041b58ab3 ffffffffaf84c518 ffffffffa3447426 ffff8801c7037b70
[ 828.394684] 0000000087690421 ffffffffb329b1e0 ffff8801c7037c38 0000000000000000
[ 828.394708] Call Trace:
[ 828.394868] dump_stack (lib/dump_stack.c:52)
[ 828.395040] ? _atomic_dec_and_lock (lib/dump_stack.c:27)
[ 828.395079] ubsan_epilogue (lib/ubsan.c:165)
[ 828.395101] __ubsan_handle_vla_bound_not_positive (lib/ubsan.c:364)
[ 828.395118] ? __ubsan_handle_out_of_bounds (lib/ubsan.c:352)
[ 828.395179] ? sock_alloc_file (net/socket.c:388)
[ 828.395194] ? sock_splice_read (net/socket.c:356)
[ 828.395217] ? check_preemption_disabled (lib/smp_processor_id.c:52)
[ 828.395244] hash_accept (crypto/algif_hash.c:185 (discriminator 1))
[ 828.395264] SYSC_accept4 (net/socket.c:1476)
[ 828.395282] ? sockfd_lookup_light (net/socket.c:1427)
[ 828.395319] ? _raw_spin_unlock_bh (kernel/locking/spinlock.c:208)
[ 828.395339] ? release_sock (net/core/sock.c:2446)
[ 828.395645] ? hash_accept_parent_nokey (crypto/algif_hash.c:380)
[ 828.396457] ? map_id_down (kernel/user_namespace.c:201)
[ 828.396484] ? SyS_futex (kernel/futex.c:3099)
[ 828.396502] ? do_futex (kernel/futex.c:3099)
[ 828.396519] ? SyS_socket (net/socket.c:1213)
[ 828.396536] ? move_addr_to_kernel (net/socket.c:1213)
[ 828.396552] SyS_accept (net/socket.c:1506)
[ 828.396569] entry_SYSCALL_64_fastpath (arch/x86/entry/entry_64.S:186)
[ 828.396596] ? vm_mmap_pgoff (mm/util.c:325)
Which is this code snippet:
static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct hash_ctx *ctx = ask->private;
struct ahash_request *req = &ctx->req;
char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
Where crypto_ahash_statesize(crypto_ahash_reqtfm(req)) == 0.
Thanks,
Sasha
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