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autofs: make dev ioctl version and ismountpoint user accessible

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Some of the autofs miscellaneous device ioctls need to be accessable to
user space applications without CAP_SYS_ADMIN to get information about
autofs mounts.

Link: http://lkml.kernel.org/r/150216642517.11652.2338933266137331637.stgit@pluto.themaw.net
Signed-off-by: Ian Kent <raven@themaw.net>
Cc: Colin Walters <walters@redhat.com>
Cc: Ondrej Holy <oholy@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ian Kent 2017-09-08 16:16:30 -07:00 committed by Linus Torvalds
parent e54c7bcbf1
commit 3dd8f7c3b7
2 changed files with 9 additions and 5 deletions
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12
fs/autofs4/dev-ioctl.c
View File

@ -628,10 +628,6 @@ static int _autofs_dev_ioctl(unsigned int command,
ioctl_fn fn = NULL;
int err = 0;
/* only root can play with this */
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
cmd_first = _IOC_NR(AUTOFS_DEV_IOCTL_IOC_FIRST);
cmd = _IOC_NR(command);
@ -640,6 +636,14 @@ static int _autofs_dev_ioctl(unsigned int command,
return -ENOTTY;
}
/* Only root can use ioctls other than AUTOFS_DEV_IOCTL_VERSION_CMD
* and AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD
*/
if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD &&
cmd != AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD &&
!capable(CAP_SYS_ADMIN))
return -EPERM;
/* Copy the parameters into kernel space. */
param = copy_dev_ioctl(user);
if (IS_ERR(param))

2
include/uapi/linux/auto_dev-ioctl.h
View File

@ -16,7 +16,7 @@
#define AUTOFS_DEVICE_NAME "autofs"
#define AUTOFS_DEV_IOCTL_VERSION_MAJOR 1
#define AUTOFS_DEV_IOCTL_VERSION_MINOR 0
#define AUTOFS_DEV_IOCTL_VERSION_MINOR 1
#define AUTOFS_DEV_IOCTL_SIZE sizeof(struct autofs_dev_ioctl)