linux-kernel - Re: [PATCH] cpufreq: amd-pstate: fix global sysfs attribute type

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Message-ID: <2023080748-apprehend-carnation-e71c@gregkh>
Date:   Mon, 7 Aug 2023 08:47:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Thomas Weißschuh <linux@...ssschuh.net>
Cc:     Huang Rui <ray.huang@....com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jannik Glueckert <jannik.glueckert@...il.com>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Linux LLVM Build Support <llvm@...ts.linux.dev>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>, stable@...r.kernel.org
Subject: Re: [PATCH] cpufreq: amd-pstate: fix global sysfs attribute type

On Mon, Aug 07, 2023 at 08:37:45AM +0200, Thomas Weißschuh wrote:
> In commit 3666062b87ec ("cpufreq: amd-pstate: move to use bus_get_dev_root()")
> the "amd_pstate" attributes where moved from a dedicated kobject to the
> cpu root kobject.
> While the dedicated kobject expects to contain kobj_attributes the root
> kobject needs device_attributes.
> 
> As the changed arguments are not used by the callbacks it works most of
> the time.
> However CFI will detect this issue:
> 
> [ 4947.849350] CFI failure at dev_attr_show+0x24/0x60 (target: show_status+0x0/0x70; expected type: 0x8651b1de)
> ...
> [ 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
> 
> Reported-by: Jannik Glückert <jannik.glueckert@...il.com>
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217765
> Link: https://lore.kernel.org/lkml/c7f1bf9b-b183-bf6e-1cbb-d43f72494083@gmail.com/
> Fixes: 3666062b87ec ("cpufreq: amd-pstate: move to use bus_get_dev_root()")
> Cc: stable@...r.kernel.org
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
> Note:
> 
> This was not tested with CFI as I don't have the toolchain available.
> Jannik, could you give it a spin?

Ah, that was fast, nice!

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>