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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