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Date:   Mon, 7 Aug 2023 08:03:07 +0200
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Bagas Sanjaya <bagasdotme@gmail.com>
Cc:     Huang Rui <ray.huang@amd.com>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Jannik =?iso-8859-1?Q?Gl=FCckert?= <jannik.glueckert@gmail.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Power Management <linux-pm@vger.kernel.org>,
        Linux LLVM Build Support <llvm@lists.linux.dev>
Subject: Re: Fwd: CFI violation when reading amd_pstate/status
Message-ID: <2023080743-amendable-moonlit-15b7@gregkh>
References: <c7f1bf9b-b183-bf6e-1cbb-d43f72494083@gmail.com>
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On Mon, Aug 07, 2023 at 06:55:49AM +0700, Bagas Sanjaya wrote:
> Hi,
>=20
> I notice a bug report on Bugzilla [1]. Quoting from it:
>=20
> > On kernel 6.4.7, with amd_pstate=3Dactive, with a Ryzen 7700X
> > I get a Clang CFI violation when reading /sys/devices/system/cpu/amd_ps=
tate/status
> >=20
> > This is reproduceable with every read, I have only tried with amd_pstat=
e=3Dactive
> >=20
> > With the following CFI and Clang configs, Clang 16.0.6
> > CONFIG_CFI_CLANG=3Dy
> > CONFIG_CFI_PERMISSIVE=3Dy
> > CONFIG_LTO_CLANG=3Dy
> > CONFIG_LTO_CLANG_THIN=3Dy
> >=20
> > Below is the full call trace, let me know if you need a trace with debu=
g info.
> >=20
> > [ 4947.849350] CFI failure at dev_attr_show+0x24/0x60 (target: show_sta=
tus+0x0/0x70; expected type: 0x8651b1de)
> > [ 4947.849358] WARNING: CPU: 2 PID: 16519 at dev_attr_show+0x24/0x60
> > [ 4947.849360] Modules linked in: binfmt_misc nf_conntrack_netbios_ns n=
f_conntrack_broadcast wireguard curve25519_x86_64 libcurve25519_generic ip6=
_udp_tunnel udp_tunnel snd_seq_dummy snd_hrtimer snd_seq rfcomm joydev uhid=
 xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack=
_tftp nft_fib_inet nft_fib_ipv6 nft_fib_ipv4 nft_fib nft_reject_inet nf_rej=
ect_ipv6 nf_reject_ipv4 nft_reject nft_ct nft_chain_nat bridge 8021q mrp ga=
rp stp llc nf_tables ebtable_nat ebtable_broute ip6table_nat ip6table_mangl=
e ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_=
ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw iptable_security ip_set nfne=
tlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_=
tables bnep vfat fat amdgpu snd_hda_codec_realtek snd_hda_codec_generic snd=
_hda_codec_hdmi snd_hda_intel mt7921e vfio_pci intel_rapl_msr mt7921_common=
 intel_rapl_common mt76_connac_lib edac_mce_amd vfio_pci_core mt76 vfio_iom=
mu_type1 vfio kvm_amd iommufd iommu_v2 snd_usb_audio
> > [ 4947.849379]  snd_intel_dspcfg gpu_sched snd_intel_sdw_acpi mac80211 =
drm_suballoc_helper snd_usbmidi_lib i2c_algo_bit drm_ttm_helper snd_hda_cod=
ec btusb ttm btrtl libarc4 btmtk snd_hda_core snd_rawmidi kvm snd_seq_devic=
e drm_display_helper btintel snd_hwdep mc btbcm irqbypass cfg80211 cec snd_=
pcm asus_nb_wmi bluetooth eeepc_wmi snd_timer asus_wmi drm_kms_helper ledtr=
ig_audio sparse_keymap snd gpio_amdpt platform_profile gpio_generic drm_bud=
dy rfkill soundcore rapl i2c_piix4 wmi_bmof pcspkr k10temp lm92 nct6775_cor=
e hwmon_vid fuse loop dm_crypt crct10dif_pclmul polyval_clmulni polyval_gen=
eric ghash_clmulni_intel nvme sp5100_tco ccp r8169 nvme_core nvme_common vi=
deo wmi sunrpc
> > [ 4947.849398] CPU: 2 PID: 16519 Comm: cat Tainted: P                  =
 6.4.7-gentoo-dist-hardened #1

Can't do much about this kernel, we don't know what's really in it,
sorry.

greg k-h