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bpf, cgroup: Fix problematic bounds check 

Since ctx.optlen is signed, a larger value than max_value could be
passed, as it is later on used as unsigned, which causes a WARN_ON_ONCE
in the copy_to_user.

Fixes: 0d01da6afc ("bpf: implement getsockopt and setsockopt hooks")
Signed-off-by: Loris Reiff <loris.reiff@liblor.ch>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/bpf/20210122164232.61770-2-loris.reiff@liblor.ch
This commit is contained in:
Loris Reiff 2021-01-22 17:42:32 +01:00 committed by Daniel Borkmann
parent bb8b81e396
commit f4a2da755a
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/cgroup.c
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@ -1464,7 +1464,7 @@ int __cgroup_bpf_run_filter_getsockopt(struct sock *sk, int level,
goto out;
}
if (ctx.optlen > max_optlen) {
if (ctx.optlen > max_optlen || ctx.optlen < 0) {
ret = -EFAULT;
goto out;
}