linux-kernel - Re: [PATCH linux-next] tools: power: x86: intel_pstate_tracer: intel_pstate_tracer: Replace the relative path of the called grep with an absolute path

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Date:   Sun, 4 Sep 2022 15:23:59 -0700
From:   Doug Smythies <dsmythies@...us.net>
To:     cgel.zte@...il.com
Cc:     linux-kernel@...r.kernel.org, xu.panda@....com.cn,
        ray.huang@....com, rafael.j.wysocki@...el.com, Jinzhou.Su@....com,
        Zeal Robot <zealci@....com.cn>,
        zhanglin <zhang.lin16@....com.cn>,
        Doug Smythies <dsmythies@...us.net>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH linux-next] tools: power: x86: intel_pstate_tracer:
 intel_pstate_tracer: Replace the relative path of the called grep with an
 absolute path

Note: Modifying the address list a little with this reply.

On Mon, Aug 29, 2022 at 5:55 AM <cgel.zte@...il.com> wrote:
>
> From: xupanda <xu.panda@....com.cn>
>
> Using absolute paths when invoking grep can lead to serious security
> issues. A malicious operator may create a new file named grep in the
> PATH before the real grep file. When the program executes and calls
> grep, the fake grep file will be executed, so that the malicious
> operator can execute arbitrary code or even obtain root privileges.
> Using absolute paths when calling grep avoids this problem.
>
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: xupanda <xu.panda@....com.cn>
> Reviewed-by: zhanglin <zhang.lin16@....com.cn>

Acked-by: Doug Smythies <dsmythies@...us.net>

>
> ---
>  tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py b/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
> index b46e9eb8f5aa..d6fae6e51d30 100755
> --- a/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
> +++ b/tools/power/x86/intel_pstate_tracer/intel_pstate_tracer.py
> @@ -348,8 +348,8 @@ def split_csv(current_max_cpu, cpu_mask):
>      if os.path.exists('cpu.csv'):
>          for index in range(0, current_max_cpu + 1):
>              if cpu_mask[int(index)] != 0:
> -                os.system('grep -m 1 common_cpu cpu.csv > cpu{:0>3}.csv'.format(index))
> -                os.system('grep CPU_{:0>3} cpu.csv >> cpu{:0>3}.csv'.format(index, index))
> +                os.system('/usr/bin/grep -m 1 common_cpu cpu.csv > cpu{:0>3}.csv'.format(index))
> +                os.system('/usr/bin/grep CPU_{:0>3} cpu.csv >> cpu{:0>3}.csv'.format(index, index))
>
>  def fix_ownership(path):
>      """Change the owner of the file to SUDO_UID, if required"""
> --
> 2.25.1
>