Author: gordon
Date: Thu Sep 27 18:39:54 2018
New Revision: 338982
URL: https://svnweb.freebsd.org/changeset/base/338982
Log:
Clear stack allocated data structure to prevent kernel memory leak.
Reported by: Thomas Barabosch, Fraunhofer FKIE
Reviewed by: wes@
Approved by: re (implicit)
Approved by: so
Security: FreeBSD-EN-18:12.mem
Security: CVE-2018-17155
Modified:
head/sys/kern/kern_context.c
Modified: head/sys/kern/kern_context.c
==============================================================================
--- head/sys/kern/kern_context.c Thu Sep 27 18:36:30 2018
(r338981)
+++ head/sys/kern/kern_context.c Thu Sep 27 18:39:54 2018
(r338982)
@@ -70,6 +70,7 @@ sys_getcontext(struct thread *td, struct getcontext_ar
if (uap->ucp == NULL)
ret = EINVAL;
else {
+ bzero(&uc, sizeof(ucontext_t));
get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
PROC_LOCK(td->td_proc);
uc.uc_sigmask = td->td_sigmask;
@@ -110,6 +111,7 @@ sys_swapcontext(struct thread *td, struct swapcontext_
if (uap->oucp == NULL || uap->ucp == NULL)
ret = EINVAL;
else {
+ bzero(&uc, sizeof(ucontext_t));
get_mcontext(td, &uc.uc_mcontext, GET_MC_CLEAR_RET);
bzero(uc.__spare__, sizeof(uc.__spare__));
PROC_LOCK(td->td_proc);
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