Commit ae30c98d authored by Alexei Starovoitov's avatar Alexei Starovoitov Committed by Greg Kroah-Hartman

bpf: check pending signals while verifying programs

[ Upstream commit c3494801 ]

Malicious user space may try to force the verifier to use as much cpu
time and memory as possible. Hence check for pending signals
while verifying the program.
Note that suspend of sys_bpf(PROG_LOAD) syscall will lead to EAGAIN,
since the kernel has to release the resources used for program verification.
Reported-by: default avatarAnatoly Trosinenko <anatoly.trosinenko@gmail.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarEdward Cree <ecree@solarflare.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent 2b8b723c
......@@ -2919,6 +2919,9 @@ static int do_check(struct bpf_verifier_env *env)
goto process_bpf_exit;
}
if (signal_pending(current))
return -EAGAIN;
if (need_resched())
cond_resched();
......
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