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Clear the p_stops field on change of user/group id, unless the correct

Browse source 
flag is set in the p_pfsflags field.  This, essentially, prevents an SUID
proram from hanging after being traced.  (E.g., "truss /usr/bin/rlogin" would
fail, but leave rlogin in a stopevent state.)  Yet another case where procctl
is (hopefully ;)) no longer needed in the general case.

Reviewed by:	bde (thanks bruce :))
This commit is contained in:
Sean Eric Fagan 1997-12-20 03:05:47 +00:00
parent aaae485bac
commit d5f81602a7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=31891
6 changed files with 58 additions and 27 deletions
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16
sys/fs/procfs/procfs_vnops.c
View file

@ -36,7 +36,7 @@
*
* @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
*
* $Id: procfs_vnops.c,v 1.47 1997/12/12 03:33:43 sef Exp $
* $Id: procfs_vnops.c,v 1.48 1997/12/13 03:13:46 sef Exp $
*/
/*
@ -224,11 +224,13 @@ procfs_ioctl(ap)
struct vop_ioctl_args *ap;
{
struct pfsnode *pfs = VTOPFS(ap->a_vp);
struct proc *procp;
struct proc *procp, *p;
int error;
int signo;
struct procfs_status *psp;
unsigned char flags;
p = ap->a_p;
procp = pfind(pfs->pfs_pid);
if (procp == NULL) {
return ENOTTY;
@ -242,7 +244,15 @@ procfs_ioctl(ap)
procp->p_stops &= ~*(unsigned int*)ap->a_data;
break;
case PIOCSFL:
procp->p_pfsflags = (unsigned char)*(unsigned int*)ap->a_data;
/*
* NFLAGS is "non-suser flags" -- currently, only
* PFS_ISUGID ("ignore set u/g id");
*/
#define NFLAGS (PF_ISUGID)
flags = (unsigned char)*(unsigned int*)ap->a_data;
if (flags & NFLAGS && (error = suser(p->p_ucred, &p->p_acflag)))
return error;
procp->p_pfsflags = flags;
break;
case PIOCGFL:
*(unsigned int*)ap->a_data = (unsigned int)procp->p_pfsflags;

4
sys/kern/kern_exec.c
View file

@ -23,7 +23,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: kern_exec.c,v 1.69 1997/12/06 04:11:09 sef Exp $
* $Id: kern_exec.c,v 1.70 1997/12/16 15:40:29 davidg Exp $
*/
#include <sys/param.h>
@ -313,7 +313,7 @@ execve(p, uap)
p->p_ucred->cr_uid = attr.va_uid;
if (attr.va_mode & VSGID)
p->p_ucred->cr_gid = attr.va_gid;
p->p_flag |= P_SUGID;
setsugid(p);
} else {
if (p->p_ucred->cr_uid == p->p_cred->p_ruid &&
p->p_ucred->cr_gid == p->p_cred->p_rgid)

42
sys/kern/kern_prot.c
View file

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)kern_prot.c 8.6 (Berkeley) 1/21/94
* $Id: kern_prot.c,v 1.37 1997/11/06 19:29:12 phk Exp $
* $Id: kern_prot.c,v 1.38 1997/12/16 17:40:16 eivind Exp $
*/
/*
@ -52,6 +52,7 @@
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/unistd.h>
#include <sys/pioctl.h>
static MALLOC_DEFINE(M_CRED, "cred", "credentials");
@ -413,8 +414,8 @@ setuid(p, uap)
* Set real uid
*/
if (uid != pc->p_ruid) {
p->p_flag |= P_SUGID;
pc->p_ruid = uid;
setsugid(p);
}
/*
* Set saved uid
@ -424,8 +425,8 @@ setuid(p, uap)
* is important that we should do this.
*/
if (pc->p_svuid != uid) {
p->p_flag |= P_SUGID;
pc->p_svuid = uid;
setsugid(p);
}
}
@ -436,7 +437,7 @@ setuid(p, uap)
if (pc->pc_ucred->cr_uid != uid) {
pc->pc_ucred = crcopy(pc->pc_ucred);
pc->pc_ucred->cr_uid = uid;
p->p_flag |= P_SUGID;
setsugid(p);
}
return (0);
}
@ -468,7 +469,7 @@ seteuid(p, uap)
if (pc->pc_ucred->cr_uid != euid) {
pc->pc_ucred = crcopy(pc->pc_ucred);
pc->pc_ucred->cr_uid = euid;
p->p_flag |= P_SUGID;
setsugid(p);
}
return (0);
}
@ -526,8 +527,8 @@ setgid(p, uap)
* Set real gid
*/
if (pc->p_rgid != gid) {
p->p_flag |= P_SUGID;
pc->p_rgid = gid;
setsugid(p);
}
/*
* Set saved gid
@ -537,8 +538,8 @@ setgid(p, uap)
* is important that we should do this.
*/
if (pc->p_svgid != gid) {
p->p_flag |= P_SUGID;
pc->p_svgid = gid;
setsugid(p);
}
}
/*
@ -548,7 +549,7 @@ setgid(p, uap)
if (pc->pc_ucred->cr_groups[0] != gid) {
pc->pc_ucred = crcopy(pc->pc_ucred);
pc->pc_ucred->cr_groups[0] = gid;
p->p_flag |= P_SUGID;
setsugid(p);
}
return (0);
}
@ -576,7 +577,7 @@ setegid(p, uap)
if (pc->pc_ucred->cr_groups[0] != egid) {
pc->pc_ucred = crcopy(pc->pc_ucred);
pc->pc_ucred->cr_groups[0] = egid;
p->p_flag |= P_SUGID;
setsugid(p);
}
return (0);
}
@ -621,7 +622,7 @@ setgroups(p, uap)
return (error);
pc->pc_ucred->cr_ngroups = ngrp;
}
p->p_flag |= P_SUGID;
setsugid(p);
return (0);
}
@ -652,18 +653,18 @@ setreuid(p, uap)
if (euid != (uid_t)-1 && pc->pc_ucred->cr_uid != euid) {
pc->pc_ucred = crcopy(pc->pc_ucred);
pc->pc_ucred->cr_uid = euid;
p->p_flag |= P_SUGID;
setsugid(p);
}
if (ruid != (uid_t)-1 && pc->p_ruid != ruid) {
(void)chgproccnt(pc->p_ruid, -1);
(void)chgproccnt(ruid, 1);
pc->p_ruid = ruid;
p->p_flag |= P_SUGID;
setsugid(p);
}
if ((ruid != (uid_t)-1 || pc->pc_ucred->cr_uid != pc->p_ruid) &&
pc->p_svuid != pc->pc_ucred->cr_uid) {
pc->p_svuid = pc->pc_ucred->cr_uid;
p->p_flag |= P_SUGID;
setsugid(p);
}
return (0);
}
@ -695,16 +696,16 @@ setregid(p, uap)
if (egid != (gid_t)-1 && pc->pc_ucred->cr_groups[0] != egid) {
pc->pc_ucred = crcopy(pc->pc_ucred);
pc->pc_ucred->cr_groups[0] = egid;
p->p_flag |= P_SUGID;
setsugid(p);
}
if (rgid != (gid_t)-1 && pc->p_rgid != rgid) {
pc->p_rgid = rgid;
p->p_flag |= P_SUGID;
setsugid(p);
}
if ((rgid != (gid_t)-1 || pc->pc_ucred->cr_groups[0] != pc->p_rgid) &&
pc->p_svgid != pc->pc_ucred->cr_groups[0]) {
pc->p_svgid = pc->pc_ucred->cr_groups[0];
p->p_flag |= P_SUGID;
setsugid(p);
}
return (0);
}
@ -879,3 +880,12 @@ setlogin(p, uap)
sizeof(logintmp));
return (error);
}
void
setsugid(p)
struct proc *p;
{
p->p_flag |= P_SUGID;
if (!(p->p_pfsflags & PF_ISUGID))
p->p_stops = 0;
}

16
sys/miscfs/procfs/procfs_vnops.c
View file

@ -36,7 +36,7 @@
*
* @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95
*
* $Id: procfs_vnops.c,v 1.47 1997/12/12 03:33:43 sef Exp $
* $Id: procfs_vnops.c,v 1.48 1997/12/13 03:13:46 sef Exp $
*/
/*
@ -224,11 +224,13 @@ procfs_ioctl(ap)
struct vop_ioctl_args *ap;
{
struct pfsnode *pfs = VTOPFS(ap->a_vp);
struct proc *procp;
struct proc *procp, *p;
int error;
int signo;
struct procfs_status *psp;
unsigned char flags;
p = ap->a_p;
procp = pfind(pfs->pfs_pid);
if (procp == NULL) {
return ENOTTY;
@ -242,7 +244,15 @@ procfs_ioctl(ap)
procp->p_stops &= ~*(unsigned int*)ap->a_data;
break;
case PIOCSFL:
procp->p_pfsflags = (unsigned char)*(unsigned int*)ap->a_data;
/*
* NFLAGS is "non-suser flags" -- currently, only
* PFS_ISUGID ("ignore set u/g id");
*/
#define NFLAGS (PF_ISUGID)
flags = (unsigned char)*(unsigned int*)ap->a_data;
if (flags & NFLAGS && (error = suser(p->p_ucred, &p->p_acflag)))
return error;
procp->p_pfsflags = flags;
break;
case PIOCGFL:
*(unsigned int*)ap->a_data = (unsigned int)procp->p_pfsflags;

4
sys/sys/pioctl.h
View file

@ -1,7 +1,7 @@
/*
* procfs ioctl definitions.
*
* $Id: pioctl.h,v 1.4 1997/12/13 03:13:36 sef Exp $
* $Id: pioctl.h,v 1.5 1997/12/15 00:29:41 sef Exp $
*/
#ifndef _SYS_PIOCTL_H
@ -41,5 +41,5 @@ struct procfs_status {
*/
# define PF_LINGER 0x01 /* Keep stops around after last close */
# define PF_ISUGID 0x02 /* Ignore UID/GID changes */
#endif

3
sys/sys/proc.h
View file

@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)proc.h 8.15 (Berkeley) 5/19/95
* $Id: proc.h,v 1.50 1997/12/06 04:11:14 sef Exp $
* $Id: proc.h,v 1.51 1997/12/12 04:00:48 dyson Exp $
*/
#ifndef _SYS_PROC_H_
@ -342,6 +342,7 @@ int fork1 __P((struct proc *, int));
int trace_req __P((struct proc *));
void cpu_wait __P((struct proc *));
int cpu_coredump __P((struct proc *, struct vnode *, struct ucred *));
void setsugid __P((struct proc *p));
#endif /* KERNEL */
#endif /* !_SYS_PROC_H_ */