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[83.28.44.95]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49cf7740d44sm651558805e9.15.2026.09.07.01.22.56 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Mon, 07 Sep 2026 01:22:57 -0700 (PDT) Date: Mon, 7 Sep 2026 10:22:52 +0200 From: Michal Pecio To: Aleksandr Nogikh Cc: Greg KH , syzbot , i@zenithal.me, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, shuah@kernel.org, syzkaller-bugs@googlegroups.com, valentina.manea.m@gmail.com, syzkaller@googlegroups.com Subject: Re: [syzbot] [usb?] general protection fault in vhci_hcd_probe Message-ID: <20260907102252.6eff5c54.michal.pecio@gmail.com> In-Reply-To: References: <6a88066b.ae6ddae5.3da009.002d.GAE@google.com> <6a9bceeb.a5e650b3.26d8a.0008.GAE@google.com> <20260905104331.6d4288df.michal.pecio@gmail.com> <2026090536-numbness-enlisted-917e@gregkh> <20260906123835.56902ed7.michal.pecio@gmail.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Mon, 7 Sep 2026 09:59:36 +0200, Aleksandr Nogikh wrote: > On Sun, Sep 6, 2026 at 12:38=E2=80=AFPM Michal Pecio wrote: > > > > On Sat, 5 Sep 2026 13:30:01 +0200, Greg KH wrote: =20 > > > On Sat, Sep 05, 2026 at 10:43:31AM +0200, Michal Pecio wrote: =20 > > > > On Sat, 05 Sep 2026 01:12:27 -0700, syzbot wrote: =20 > > > > > syzbot has found a reproducer for the following issue on: > > > > > > > > > > HEAD commit: 9d80aa4617b3 Add linux-next specific files for 20= 260903 > > > > > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/nex= t/linux-next.git > > > > > console output: https://syzkaller.appspot.com/x/log.txt?x=3D10adf= 4f9580000 > > > > > kernel config: https://syzkaller.appspot.com/x/.config?x=3Dbb4a3= 2c282cc2ec7 > > > > > dashboard link: https://syzkaller.appspot.com/bug?extid=3D7300aff= e388249d66dfe > > > > > compiler: Debian clang version 22.1.8 (++20260613092233+e80= beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 > > > > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D121c7= 215580000 =20 > > > > > > > > Who or what is coming up with these ideas and even commenting it? > > > > > > > > // Iterate platform devices > > > > dir =3D opendir("/sys/bus/platform/devices/"); > > > > > > > > while ((ent =3D readdir(dir)) !=3D NULL) { > > > > > > > > // Set driver override > > > > snprintf(path, sizeof(path), "/sys/bus/platform/devices/%s/= driver_override", ent->d_name); > > > > fd =3D open(path, O_WRONLY); > > > > > > > > // Bind to vhci_hcd > > > > fd =3D open("/sys/bus/platform/drivers/vhci_hcd/bind", O_WR= ONLY); =20 > > > > > > That will taint the kernel in newer releases, and syzbot has already > > > been told not to do this, it's not "valid" at all. =20 > > > > What cought my attention is that Google apparently has some capability > > (human, machine or otherwise) to understand how this repro works, and > > yet they keep reporting this broken pattern. =20 >=20 > As Greg pointed out, we've adjusted the fuzzer to stop using this > kernel interface, so there should be no new bugs of this type. > However, we haven't yet invalidated all such reported bugs, so some > notifications like this one may still leak. I'll look into > mass-invalidation of them all, but in the meanwhile let's close this > particular one: >=20 > #syz invalid Thanks, that should do it. Nota bene, this can be triggered not only by the per-device 'driver_override' files, but also the per-driver 'new_id'. While I haven't yet seen your syzbot instance using the latter, I have seen others, so this needs to be filtered too. Regards, Michal