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| author | Isaac J. Manjarres <isaacmanjarres@google.com> | 2025-07-29 18:51:46 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-28 16:28:39 +0200 |
| commit | 87a75f68eaba1a2edcd415e6a21acafe96487dcc (patch) | |
| tree | 777e4d0efc5db1f42a5e9f1e129331997bfcd04f /mm/shmem.c | |
| parent | 17c5d49beb6cf9dc5b1e3e4bdde465a8683548f8 (diff) | |
| download | linux-87a75f68eaba1a2edcd415e6a21acafe96487dcc.tar.gz linux-87a75f68eaba1a2edcd415e6a21acafe96487dcc.tar.bz2 linux-87a75f68eaba1a2edcd415e6a21acafe96487dcc.zip | |
mm: update memfd seal write check to include F_SEAL_WRITE
From: Lorenzo Stoakes <lstoakes@gmail.com>
[ 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/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 283fb62084d4..ecf1011cc3e2 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2396,7 +2396,7 @@ 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; |