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seccomp: Fix ioctl number for SECCOMP_IOCTL_NOTIF_ID_VALID

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[ Upstream commit 47e33c05f9f07cac3de833e531bcac9ae052c7ca ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kees Cook 2020-06-15 15:42:46 -07:00 committed by Greg Kroah-Hartman
parent 7915a3c041
commit 0f09c88f20
3 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/uapi/linux/seccomp.h
View File

@ -93,5 +93,6 @@ 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

@ -42,6 +42,14 @@
#include <linux/uaccess.h>
#include <linux/anon_inodes.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,
@ -1168,6 +1176,7 @@ 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

@ -177,7 +177,7 @@ 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;