Date: Wed, 15 Nov 2017 22:39:41 +0000 (UTC) From: Gordon Tetlow <gordon@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-releng@freebsd.org Subject: svn commit: r325868 - releng/11.1/sys/kern Message-ID: <201711152239.vAFMdfXM006189@repo.freebsd.org>
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Author: gordon Date: Wed Nov 15 22:39:41 2017 New Revision: 325868 URL: https://svnweb.freebsd.org/changeset/base/325868 Log: Fix kernel data leak via ptrace(PT_LWPINFO). [SA-17:08] Approved by: so Security: FreeBSD-SA-17:08.ptrace Security: CVE-2017-1086 Modified: releng/11.1/sys/kern/sys_process.c Modified: releng/11.1/sys/kern/sys_process.c ============================================================================== --- releng/11.1/sys/kern/sys_process.c Wed Nov 15 22:35:16 2017 (r325867) +++ releng/11.1/sys/kern/sys_process.c Wed Nov 15 22:39:41 2017 (r325868) @@ -518,6 +518,7 @@ ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl, struct ptrace_lwpinfo32 *pl32) { + bzero(pl32, sizeof(*pl32)); pl32->pl_lwpid = pl->pl_lwpid; pl32->pl_event = pl->pl_event; pl32->pl_flags = pl->pl_flags; @@ -1301,6 +1302,7 @@ kern_ptrace(struct thread *td, int req, pid_t pid, voi } else #endif pl = addr; + bzero(pl, sizeof(*pl)); pl->pl_lwpid = td2->td_tid; pl->pl_event = PL_EVENT_NONE; pl->pl_flags = 0; @@ -1321,8 +1323,6 @@ kern_ptrace(struct thread *td, int req, pid_t pid, voi pl->pl_siginfo = td2->td_dbgksi.ksi_info; } } - if ((pl->pl_flags & PL_FLAG_SI) == 0) - bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo)); if (td2->td_dbgflags & TDB_SCE) pl->pl_flags |= PL_FLAG_SCE; else if (td2->td_dbgflags & TDB_SCX)
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