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seccomp: Fix ioctl number for SECCOMP_IOCTL_NOTIF_ID_VALID 

When SECCOMP_IOCTL_NOTIF_ID_VALID was first introduced it had the wrong
direction flag set. While this isn't a big deal as nothing currently
enforces these bits in the kernel, it should be defined correctly. Fix
the define and provide support for the old command until it is no longer
needed for backward compatibility.

Fixes: 6a21cc50f0 ("seccomp: add a return code to trap to userspace")
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Kees Cook 2020-06-15 15:42:46 -07:00
parent 279ed89000
commit 47e33c05f9
3 changed files with 12 additions and 2 deletions
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3
include/uapi/linux/seccomp.h
View File

@ -123,5 +123,6 @@ struct seccomp_notif_resp {
#define SECCOMP_IOCTL_NOTIF_RECV SECCOMP_IOWR(0, struct seccomp_notif)
#define SECCOMP_IOCTL_NOTIF_SEND SECCOMP_IOWR(1, \
struct seccomp_notif_resp)
#define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOR(2, __u64)
#define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOW(2, __u64)
#endif /* _UAPI_LINUX_SECCOMP_H */

9
kernel/seccomp.c
View File

@ -44,6 +44,14 @@
#include <linux/anon_inodes.h>
#include <linux/lockdep.h>
/*
* When SECCOMP_IOCTL_NOTIF_ID_VALID was first introduced, it had the
* wrong direction flag in the ioctl number. This is the broken one,
* which the kernel needs to keep supporting until all userspaces stop
* using the wrong command number.
*/
#define SECCOMP_IOCTL_NOTIF_ID_VALID_WRONG_DIR SECCOMP_IOR(2, __u64)
enum notify_state {
SECCOMP_NOTIFY_INIT,
SECCOMP_NOTIFY_SENT,
@ -1236,6 +1244,7 @@ static long seccomp_notify_ioctl(struct file *file, unsigned int cmd,
return seccomp_notify_recv(filter, buf);
case SECCOMP_IOCTL_NOTIF_SEND:
return seccomp_notify_send(filter, buf);
case SECCOMP_IOCTL_NOTIF_ID_VALID_WRONG_DIR:
case SECCOMP_IOCTL_NOTIF_ID_VALID:
return seccomp_notify_id_valid(filter, buf);
default:

2
tools/testing/selftests/seccomp/seccomp_bpf.c
View File

@ -186,7 +186,7 @@ struct seccomp_metadata {
#define SECCOMP_IOCTL_NOTIF_RECV SECCOMP_IOWR(0, struct seccomp_notif)
#define SECCOMP_IOCTL_NOTIF_SEND SECCOMP_IOWR(1, \
struct seccomp_notif_resp)
#define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOR(2, __u64)
#define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOW(2, __u64)
struct seccomp_notif {
__u64 id;