diff options
Diffstat (limited to 'sys/miscfs/procfs/procfs_ctl.c')
| -rw-r--r-- | sys/miscfs/procfs/procfs_ctl.c | 29 |
1 files changed, 25 insertions, 4 deletions
diff --git a/sys/miscfs/procfs/procfs_ctl.c b/sys/miscfs/procfs/procfs_ctl.c index 98e90b6f04a..346b2edc704 100644 --- a/sys/miscfs/procfs/procfs_ctl.c +++ b/sys/miscfs/procfs/procfs_ctl.c @@ -1,4 +1,4 @@ -/* $OpenBSD: procfs_ctl.c,v 1.4 1996/09/27 01:52:01 bitblt Exp $ */ +/* $OpenBSD: procfs_ctl.c,v 1.5 1996/10/14 09:27:54 deraadt Exp $ */ /* $NetBSD: procfs_ctl.c,v 1.14 1996/02/09 22:40:48 christos Exp $ */ /* @@ -102,6 +102,11 @@ static vfs_namemap_t signames[] = { static int procfs_control __P((struct proc *, struct proc *, int)); +/* Macros to clear/set/test flags. */ +#define SET(t, f) (t) |= (f) +#define CLR(t, f) (t) &= ~(f) +#define ISSET(t, f) ((t) & (f)) + static int procfs_control(curp, p, op) struct proc *curp; @@ -115,14 +120,30 @@ procfs_control(curp, p, op) * by the calling process. */ if (op == PROCFS_CTL_ATTACH) { + /* can't trace yourself! */ + if (p->p_pid == curp->p_pid) + return (EINVAL); + /* check whether already being traced */ if (p->p_flag & P_TRACED) return (EBUSY); - /* can't trace yourself! */ - if (p->p_pid == curp->p_pid) - return (EINVAL); + /* + * it's not owned by you, or the last exec gave us + * setuid/setgid privs (unless you're root), + */ + if ((p->p_cred->p_ruid != curp->p_cred->p_ruid || + ISSET(p->p_flag, P_SUGID)) && + (error = suser(p->p_ucred, &p->p_acflag)) != 0) + return (error); + /* + * ...it's init, which controls the security level + * -1 -- permanently insecure + * 0 -- insecure/single-user + */ + if ((p->p_pid) == 1 && (securelevel > -1)) + return (EPERM); /* * Go ahead and set the trace flag. |