linux-kernel - Re: [PATCH] fs: export anon_inode_make_secure

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Message-ID: <da5316a7-eee3-4c96-83dd-78ae9f3e0117@suse.cz>
Date: Thu, 19 Jun 2025 11:13:49 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Shivank Garg <shivankg@....com>, david@...hat.com,
 akpm@...ux-foundation.org, brauner@...nel.org, paul@...l-moore.com,
 rppt@...nel.org, viro@...iv.linux.org.uk
Cc: seanjc@...gle.com, willy@...radead.org, pbonzini@...hat.com,
 tabba@...gle.com, afranji@...gle.com, ackerleytng@...gle.com, jack@...e.cz,
 hch@...radead.org, cgzones@...glemail.com, ira.weiny@...el.com,
 roypat@...zon.co.uk, linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH] fs: export anon_inode_make_secure_inode() and fix
 secretmem LSM bypass

On 6/19/25 09:31, Shivank Garg wrote:
> Export anon_inode_make_secure_inode() to allow KVM guest_memfd to create
> anonymous inodes with proper security context. This replaces the current
> pattern of calling alloc_anon_inode() followed by
> inode_init_security_anon() for creating security context manually.
> 
> This change also fixes a security regression in secretmem where the
> S_PRIVATE flag was not cleared after alloc_anon_inode(), causing
> LSM/SELinux checks to be bypassed for secretmem file descriptors.
> 
> As guest_memfd currently resides in the KVM module, we need to export this

Could we use the new EXPORT_SYMBOL_GPL_FOR_MODULES() thingy to make this
explicit for KVM?