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[57.132.132.155]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7598664d715sm1707318a34.0.2025.09.16.15.16.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Sep 2025 15:16:41 -0700 (PDT) Message-ID: Subject: Re: [REGRESSION] af_unix: Introduce SO_PASSRIGHTS - break OpenGL From: brian.scott.sampson@gmail.com To: Kuniyuki Iwashima , christian@heusel.eu Cc: davem@davemloft.net, difrost.kernel@gmail.com, dnaim@cachyos.org, edumazet@google.com, horms@kernel.org, kuba@kernel.org, kuniyu@amazon.com, linux-kernel@vger.kernel.org, mario.limonciello@amd.com, netdev@vger.kernel.org, pabeni@redhat.com, regressions@lists.linux.dev Date: Tue, 16 Sep 2025 17:16:40 -0500 In-Reply-To: <20250611164339.2828069-1-kuni1840@gmail.com> References: <58be003a-c956-494b-be04-09a5d2c411b9@heusel.eu> <20250611164339.2828069-1-kuni1840@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (by Flathub.org) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 > Thanks for the report. >=20 > Could you test the diff below ? >=20 > look like some programs start listen()ing before setting > SO_PASSCRED or SO_PASSPIDFD and there's a small race window. >=20 > ---8<--- > diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c > index fd6b5e17f6c4..87439d7f965d 100644 > --- a/net/unix/af_unix.c > +++ b/net/unix/af_unix.c > @@ -1971,7 +1971,8 @@ static void unix_maybe_add_creds(struct sk_buff > *skb, const struct sock *sk, > =C2=A0 if (UNIXCB(skb).pid) > =C2=A0 return; > =C2=A0 > - if (unix_may_passcred(sk) || unix_may_passcred(other)) { > + if (unix_may_passcred(sk) || unix_may_passcred(other) || > + =C2=A0=C2=A0=C2=A0 !other->sk_socket) { > =C2=A0 UNIXCB(skb).pid =3D get_pid(task_tgid(current)); > =C2=A0 current_uid_gid(&UNIXCB(skb).uid, &UNIXCB(skb).gid); > =C2=A0 } > ---8<--- Just came across this when troubleshooting a resume from suspend issue where I'm get a black screen after suspend. Initially saw this with my distribution's(Linux 6.16.7-2-cachyos) kernel, and confirmed the issue in the latest version of the vanilla mainline kernel. Bisection is also pointing to commit 3f84d577b79d2fce8221244f2509734940609ca6.=20 This patch appears to be already applied in the mainline kernel, so this might be something different. I'm new to mailing lists, so wasn't sure if I should report this issue here or start a new email chain. --=20 Brian Sampson