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authorChristian Brauner <brauner@kernel.org>2023-01-13 12:49:26 +0100
committerChristian Brauner (Microsoft) <brauner@kernel.org>2023-01-19 09:24:29 +0100
commit01beba7957a26f9b7179127e8ad56bb5a0f56138 (patch)
tree26a20e0cb27ada10e5e81332174d9f5d0bd19ac8 /mm/madvise.c
parentf2d40141d5d90b882e2c35b226f9244a63b82b6e (diff)
fs: port inode_owner_or_capable() to mnt_idmap
Convert to struct mnt_idmap. Last cycle we merged the necessary infrastructure in 256c8aed2b42 ("fs: introduce dedicated idmap type for mounts"). This is just the conversion to struct mnt_idmap. Currently we still pass around the plain namespace that was attached to a mount. This is in general pretty convenient but it makes it easy to conflate namespaces that are relevant on the filesystem with namespaces that are relevent on the mount level. Especially for non-vfs developers without detailed knowledge in this area this can be a potential source for bugs. Once the conversion to struct mnt_idmap is done all helpers down to the really low-level helpers will take a struct mnt_idmap argument instead of two namespace arguments. This way it becomes impossible to conflate the two eliminating the possibility of any bugs. All of the vfs and all filesystems only operate on struct mnt_idmap. Acked-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Diffstat (limited to 'mm/madvise.c')
-rw-r--r--mm/madvise.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/madvise.c b/mm/madvise.c
index a56a6d17e201..72297d5edab7 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -329,7 +329,7 @@ static inline bool can_do_file_pageout(struct vm_area_struct *vma)
* otherwise we'd be including shared non-exclusive mappings, which
* opens a side channel.
*/
- return inode_owner_or_capable(&init_user_ns,
+ return inode_owner_or_capable(&nop_mnt_idmap,
file_inode(vma->vm_file)) ||
file_permission(vma->vm_file, MAY_WRITE) == 0;
}