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Date:   Mon, 7 Aug 2023 06:55:49 +0700
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To:     Huang Rui <ray.huang@amd.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        =?UTF-8?Q?Jannik_Gl=c3=bcckert?= <jannik.glueckert@gmail.com>
Cc:     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>
From:   Bagas Sanjaya <bagasdotme@gmail.com>
Subject: Fwd: CFI violation when reading amd_pstate/status
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Hi,

I notice a bug report on Bugzilla [1]. Quoting from it:

> 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 i=
p6_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_con=
ntrack_tftp nft_fib_inet nft_fib_ipv6 nft_fib_ipv4 nft_fib nft_reject_ine=
t nf_reject_ipv6 nf_reject_ipv4 nft_reject nft_ct nft_chain_nat bridge 80=
21q mrp garp stp llc nf_tables ebtable_nat ebtable_broute ip6table_nat ip=
6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntr=
ack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw iptable_secu=
rity ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables =
iptable_filter ip_tables bnep vfat fat amdgpu snd_hda_codec_realtek snd_h=
da_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 vfi=
o_pci_core mt76 vfio_iommu_type1 vfio kvm_amd iommufd iommu_v2 snd_usb_au=
dio
> [ 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_c=
odec btusb ttm btrtl libarc4 btmtk snd_hda_core snd_rawmidi kvm snd_seq_d=
evice drm_display_helper btintel snd_hwdep mc btbcm irqbypass cfg80211 ce=
c snd_pcm asus_nb_wmi bluetooth eeepc_wmi snd_timer asus_wmi drm_kms_help=
er ledtrig_audio sparse_keymap snd gpio_amdpt platform_profile gpio_gener=
ic drm_buddy rfkill soundcore rapl i2c_piix4 wmi_bmof pcspkr k10temp lm92=
 nct6775_core hwmon_vid fuse loop dm_crypt crct10dif_pclmul polyval_clmul=
ni polyval_generic ghash_clmulni_intel nvme sp5100_tco ccp r8169 nvme_cor=
e nvme_common video wmi sunrpc
> [ 4947.849398] CPU: 2 PID: 16519 Comm: cat Tainted: P                  =
 6.4.7-gentoo-dist-hardened #1
> [ 4947.849399] Hardware name: ASUS System Product Name/TUF GAMING B650M=
-PLUS WIFI, BIOS 1616 05/16/2023
> [ 4947.849400] RIP: 0010:dev_attr_show+0x24/0x60
> [ 4947.849401] Code: 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 41 56=
 53 4c 8b 5e 10 4d 85 db 74 34 49 89 f6 41 ba 22 4e ae 79 45 03 53 f1 74 =
02 <0f> 0b 41 ff d3 0f 1f 00 48 89 c3 48 3d 00 10 00 00 7c 19 49 8b 76
> [ 4947.849403] RSP: 0018:ffffb33a03d9fd10 EFLAGS: 00010203
> [ 4947.849404] RAX: ffff922f11509980 RBX: ffff9230e86f43c0 RCX: 0000000=
000000000
> [ 4947.849404] RDX: ffff922f1746b000 RSI: ffffffffaee25f10 RDI: ffff922=
f0005f800
> [ 4947.849405] RBP: ffff9230e86f43e8 R08: 0000000000001000 R09: ffff922=
f1746b000
> [ 4947.849405] R10: 0000000015e419ad R11: ffffffffadda9330 R12: fffffff=
fae8aa188
> [ 4947.849406] R13: ffff9233bbcb6fc0 R14: ffffffffaee25f10 R15: ffff922=
f1746b000
> [ 4947.849407] FS:  00007eff007b4740(0000) GS:ffff923657e80000(0000) kn=
lGS:0000000000000000
> [ 4947.849407] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 4947.849408] CR2: 00007eff0099f000 CR3: 000000010a0a2000 CR4: 0000000=
000750ee0
> [ 4947.849409] PKRU: 55555554
> [ 4947.849409] Call Trace:
> [ 4947.849410]  <TASK>
> [ 4947.849411]  ? __warn+0xcf/0x1c0
> [ 4947.849414]  ? dev_attr_show+0x24/0x60
> [ 4947.849415]  ? report_cfi_failure+0x4e/0x60
> [ 4947.849417]  ? handle_cfi_failure+0x14c/0x1d0
> [ 4947.849419]  ? __cfi_show_status+0x10/0x10
> [ 4947.849420]  ? handle_bug+0x4f/0x90
> [ 4947.849421]  ? exc_invalid_op+0x1a/0x60
> [ 4947.849422]  ? asm_exc_invalid_op+0x1a/0x20
> [ 4947.849424]  ? __cfi_show_status+0x10/0x10
> [ 4947.849425]  ? dev_attr_show+0x24/0x60
> [ 4947.849426]  sysfs_kf_seq_show+0xa6/0x110
> [ 4947.849433]  seq_read_iter+0x16c/0x4b0
> [ 4947.849436]  vfs_read+0x272/0x2d0
> [ 4947.849438]  ksys_read+0x72/0xe0
> [ 4947.849439]  do_syscall_64+0x76/0xb0
> [ 4947.849440]  ? do_user_addr_fault+0x252/0x650
> [ 4947.849442]  ? exc_page_fault+0x7a/0x1b0
> [ 4947.849443]  entry_SYSCALL_64_after_hwframe+0x72/0xdc
> [ 4947.849444] RIP: 0033:0x7eff008b2651
> [ 4947.849445] Code: b5 fe ff ff 48 8d 3d 66 42 0a 00 50 e8 68 1b 02 00=
 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d ad 0d 0e 00 00 74 13 31 c0 0f =
05 <48> 3d 00 f0 ff ff 77 57 c3 66 0f 1f 44 00 00 53 48 83 ec 20 48 89
> [ 4947.849446] RSP: 002b:00007ffecca23268 EFLAGS: 00000246 ORIG_RAX: 00=
00000000000000
> [ 4947.849447] RAX: ffffffffffffffda RBX: 0000000000008000 RCX: 00007ef=
f008b2651
> [ 4947.849447] RDX: 0000000000020000 RSI: 00007eff009a0000 RDI: 0000000=
000000003
> [ 4947.849448] RBP: 0000000000000003 R08: 00000000ffffffff R09: 0000000=
000000000
> [ 4947.849448] R10: 0000000000000022 R11: 0000000000000246 R12: 0000000=
000020000
> [ 4947.849449] R13: 0000000000000000 R14: 00007eff009a0000 R15: 0000000=
000020000
> [ 4947.849450]  </TASK>
> [ 4947.849450] ---[ end trace 0000000000000000 ]---

See Bugzilla for the full thread.

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=3D217765

--=20
An old man doll... just what I always wanted! - Clara