CVE-2025-38396
fs: export anon_inode_make_secure_inode() and fix secretmem LSM bypass
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fs: export anon_inode_make_secure_inode() and fix secretmem LSM bypass
In the Linux kernel, the following vulnerability has been resolved: fs: export anon_inode_make_secure_inode() and fix secretmem LSM bypass 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 symbol for use outside the core kernel. In the future, guest_memfd might be moved to core-mm, at which point the symbols no longer would have to be exported. When/if that happens is still unclear.
Reserved 2025-04-16 | Published 2025-07-25 | Updated 2025-07-25 | Assigner Linuxgit.kernel.org/...c/66d29d757c968d2bee9124816da5d718eb352959
git.kernel.org/...c/e3eed01347721cd7a8819568161c91d538fbf229
git.kernel.org/...c/f94c422157f3e43dd31990567b3e5d54b3e5b32b
git.kernel.org/...c/6ca45ea48530332a4ba09595767bd26d3232743b
git.kernel.org/...c/cbe4134ea4bc493239786220bd69cb8a13493190
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