Using either of these is going to greatly confuse userspace, as they are
not valid symlink names and so creating the usual /dev/mapper/NAME
symlink will not be possible. As creating a device with either of these
names is almost certainly a userspace bug, just error out.
Signed-off-by: Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-ioctl.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 9ae00e3c1a72c19575814cf473774835b364320b..17ece816d490b6c40d019da131ade44c9a201dab 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -775,8 +775,10 @@ static int check_name(const char *name)
return -EINVAL;
}
- if (strcmp(name, DM_CONTROL_NODE) == 0) {
- DMERR("device name cannot be \"%s\"", DM_CONTROL_NODE);
+ if (strcmp(name, DM_CONTROL_NODE) == 0 ||
+ strcmp(name, ".") == 0 ||
+ strcmp(name, "..") == 0) {
+ DMERR("device name cannot be \"%s\", \".\", or \"..\"", DM_CONTROL_NODE);
return -EINVAL;
}
--
Sincerely,
Demi Marie Obenour (she/her/hers)
Invisible Things Lab
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