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| author | Lorenzo Stoakes <lstoakes@gmail.com> | 2025-07-29 18:53:31 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-28 16:24:30 +0200 |
| commit | d919658a387108f53f9cf9db10c8a585aaf25823 (patch) | |
| tree | 87b18da4349cc91e092deded8287b3d5ba938851 /mm | |
| parent | 27df40ad74451d438bb4874d68f111a0aca6494e (diff) | |
| download | linux-d919658a387108f53f9cf9db10c8a585aaf25823.tar.gz linux-d919658a387108f53f9cf9db10c8a585aaf25823.tar.bz2 linux-d919658a387108f53f9cf9db10c8a585aaf25823.zip | |
mm: update memfd seal write check to include F_SEAL_WRITE
[ Upstream commit 28464bbb2ddc199433383994bcb9600c8034afa1 ]
The seal_check_future_write() function is called by shmem_mmap() or
hugetlbfs_file_mmap() to disallow any future writable mappings of an memfd
sealed this way.
The F_SEAL_WRITE flag is not checked here, as that is handled via the
mapping->i_mmap_writable mechanism and so any attempt at a mapping would
fail before this could be run.
However we intend to change this, meaning this check can be performed for
F_SEAL_WRITE mappings also.
The logic here is equally applicable to both flags, so update this
function to accommodate both and rename it accordingly.
Link: https://lkml.kernel.org/r/913628168ce6cce77df7d13a63970bae06a526e0.1697116581.git.lstoakes@gmail.com
Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: stable@vger.kernel.org
Signed-off-by: Isaac J. Manjarres <isaacmanjarres@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/shmem.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index 431a48e1b90c..06ed84ebdf3b 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2262,7 +2262,7 @@ static int shmem_mmap(struct file *file, struct vm_area_struct *vma) struct shmem_inode_info *info = SHMEM_I(file_inode(file)); int ret; - ret = seal_check_future_write(info->seals, vma); + ret = seal_check_write(info->seals, vma); if (ret) return ret; |