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| author | Lorenzo Stoakes <lstoakes@gmail.com> | 2023-10-12 18:04:29 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-10-18 14:34:19 -0700 |
| commit | 28464bbb2ddc199433383994bcb9600c8034afa1 (patch) | |
| tree | 842756d4566e617a828b773eb385fd746e6ae997 /mm/shmem.c | |
| parent | e8e17ee90eaf650c855adb0a3e5e965fd6692ff1 (diff) | |
| download | linux-stable-28464bbb2ddc199433383994bcb9600c8034afa1.tar.gz linux-stable-28464bbb2ddc199433383994bcb9600c8034afa1.tar.bz2 linux-stable-28464bbb2ddc199433383994bcb9600c8034afa1.zip | |
mm: update memfd seal write check to include F_SEAL_WRITE
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>
Diffstat (limited to 'mm/shmem.c')
| -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 61b170324e5c..bcbe9dbb9f5f 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2378,7 +2378,7 @@ static int shmem_mmap(struct file *file, struct vm_area_struct *vma) struct shmem_inode_info *info = SHMEM_I(inode); int ret; - ret = seal_check_future_write(info->seals, vma); + ret = seal_check_write(info->seals, vma); if (ret) return ret; |