path: root/ipc/mqueue.c
diff options
authorEric W. Biederman <ebiederm@xmission.com>2016-06-09 15:34:02 -0500
committerEric W. Biederman <ebiederm@xmission.com>2016-06-23 15:41:57 -0500
commita2982cc922c3068783eb9a1f77a5626a1ec36a1f (patch)
tree61ccc6ad01f8804d5290ae4565ba8d4238bf648a /ipc/mqueue.c
parent3ee690143c3c99f6c0e83f08ff17556890bc6027 (diff)
vfs: Generalize filesystem nodev handling.
Introduce a function may_open_dev that tests MNT_NODEV and a new superblock flab SB_I_NODEV. Use this new function in all of the places where MNT_NODEV was previously tested. Add the new SB_I_NODEV s_iflag to proc, sysfs, and mqueuefs as those filesystems should never support device nodes, and a simple superblock flags makes that very hard to get wrong. With SB_I_NODEV set if any device nodes somehow manage to show up on on a filesystem those device nodes will be unopenable. Acked-by: Seth Forshee <seth.forshee@canonical.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'ipc/mqueue.c')
1 files changed, 1 insertions, 1 deletions
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 5bdd50de7d05..0b13ace266f2 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -307,7 +307,7 @@ static int mqueue_fill_super(struct super_block *sb, void *data, int silent)
struct inode *inode;
struct ipc_namespace *ns = sb->s_fs_info;
- sb->s_iflags |= SB_I_NOEXEC;
+ sb->s_iflags |= SB_I_NOEXEC | SB_I_NODEV;
sb->s_blocksize = PAGE_SIZE;
sb->s_blocksize_bits = PAGE_SHIFT;
sb->s_magic = MQUEUE_MAGIC;