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Use unsigned int for index value.

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Without this change a local attacker could trigger a panic by
tricking the kernel into accessing undefined kernel memory.

We would like to acknowledge Francisco Falcon from CORE Security
Technologies who discovered the issue and reported to the
FreeBSD Security Team.

More information can be found at CORE Security's advisory at:
http://www.coresecurity.com/content/freebsd-kernel-multiple-vulnerabilities

This is an errata candidate for releng/10.1 and releng/9.3.  Earlier
releases are not affected.

Reported by:	Francisco Falcon from CORE Security Technologies
Security:	CVE-2014-0998
Reviewed by:	dumbbell
MFC after:	3 days
This commit is contained in:
delphij 2015-01-27 19:35:41 +00:00
parent 5cdb10065c
commit 1ff092273d
1 changed files with 8 additions and 5 deletions
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13
sys/dev/vt/vt_core.c
View File

@ -2367,20 +2367,23 @@ skip_thunk:
}
VT_UNLOCK(vd);
return (EINVAL);
case VT_WAITACTIVE:
case VT_WAITACTIVE: {
unsigned int idx;
error = 0;
i = *(unsigned int *)data;
if (i > VT_MAXWINDOWS)
idx = *(unsigned int *)data;
if (idx > VT_MAXWINDOWS)
return (EINVAL);
if (i != 0)
vw = vd->vd_windows[i - 1];
if (idx > 0)
vw = vd->vd_windows[idx - 1];
VT_LOCK(vd);
while (vd->vd_curwindow != vw && error == 0)
error = cv_wait_sig(&vd->vd_winswitch, &vd->vd_lock);
VT_UNLOCK(vd);
return (error);
}
case VT_SETMODE: { /* set screen switcher mode */
struct vt_mode *mode;
struct proc *p1;