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Date: Tue, 28 Jul 2020 16:50:14 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: madvenka@...ux.microsoft.com
Cc: kernel-hardening@...ts.openwall.com, linux-api@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-security-module@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v1 1/4] [RFC] fs/trampfd: Implement the trampoline file
descriptor API
On 07/28, madvenka@...ux.microsoft.com wrote:
>
> +bool is_trampfd_vma(struct vm_area_struct *vma)
> +{
> + struct file *file = vma->vm_file;
> +
> + if (!file)
> + return false;
> + return !strcmp(file->f_path.dentry->d_name.name, trampfd_name);
Hmm, this looks obviously wrong or I am totally confused. A user can
create a file named "[trampfd]", mmap it, and fool trampfd_fault() ?
Why not
return file->f_op == trampfd_fops;
?
> +EXPORT_SYMBOL_GPL(is_trampfd_vma);
why is it exported?
Oleg.
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