Date: Thu, 27 Sep 2018 18:39:54 +0000 (UTC) From: Gordon Tetlow <gordon@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r338982 - head/sys/kern Message-ID: <201809271839.w8RIdsIr074454@repo.freebsd.org>
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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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