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| author | Eric W. Biederman <ebiederm@xmission.com> | 2016-06-09 16:06:06 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2016-06-23 15:41:46 -0500 |
| commit | 8654df4e2ac9704905198d63845554c2ddf6a93f (patch) | |
| tree | 80c18b034fecf8e5754945f9e31ad2a807386907 /fs/sysfs | |
| parent | 695e9df010e40f407f4830dc11d53dce957710ba (diff) | |
| download | lwn-8654df4e2ac9704905198d63845554c2ddf6a93f.tar.gz lwn-8654df4e2ac9704905198d63845554c2ddf6a93f.zip | |
mnt: Refactor fs_fully_visible into mount_too_revealing
Replace the call of fs_fully_visible in do_new_mount from before the
new superblock is allocated with a call of mount_too_revealing after
the superblock is allocated. This winds up being a much better location
for maintainability of the code.
The first change this enables is the replacement of FS_USERNS_VISIBLE
with SB_I_USERNS_VISIBLE. Moving the flag from struct filesystem_type
to sb_iflags on the superblock.
Unfortunately mount_too_revealing fundamentally needs to touch
mnt_flags adding several MNT_LOCKED_XXX flags at the appropriate
times. If the mnt_flags did not need to be touched the code
could be easily moved into the filesystem specific mount code.
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/sysfs')
| -rw-r--r-- | fs/sysfs/mount.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c index f3db82071cfb..f31e36994dfb 100644 --- a/fs/sysfs/mount.c +++ b/fs/sysfs/mount.c @@ -42,7 +42,7 @@ static struct dentry *sysfs_mount(struct file_system_type *fs_type, kobj_ns_drop(KOBJ_NS_TYPE_NET, ns); else if (new_sb) /* Userspace would break if executables appear on sysfs */ - root->d_sb->s_iflags |= SB_I_NOEXEC; + root->d_sb->s_iflags |= SB_I_USERNS_VISIBLE | SB_I_NOEXEC; return root; } @@ -59,7 +59,7 @@ static struct file_system_type sysfs_fs_type = { .name = "sysfs", .mount = sysfs_mount, .kill_sb = sysfs_kill_sb, - .fs_flags = FS_USERNS_VISIBLE | FS_USERNS_MOUNT, + .fs_flags = FS_USERNS_MOUNT, }; int __init sysfs_init(void) |